Answer:
Explanation:
An equation in point-slope form for the line perpendicular to y=1/4x-7 and passing through (-2,-6) is:
y - (-6) = -4(x - (-2))
This equation can also be written in slope-intercept form (y = mx + b) as:
y = -4x + 4
The slope of the line is -4 because it is perpendicular to the line y=1/4x-7 and the slope of that line is 1/4. The point (-2,-6) is the point where the line passes through, so the y-intercept is 4.
Which of the following has the same number of significant figures as the number 1.00310? Select one: A. 8.66 B. 1 × 106 C. 199.791 D. 5.119 E. 100
Option B of the following has the same number of significant figures as the number 1.00310
The number 1.00310 has five significant figures. A significant figure is any digit that can be known with certainty, and it includes all digits except leading zeroes in a number. Out of the options, B. 1×106 also has five significant figures. This is because a number written in scientific notation is considered to have as many significant figures as the coefficient has. The coefficient 1 has 1 significant figure and it is the same as the number 1.00310 which has five significant figures.The other options:
A. 8.66 has three significant figures
C. 199.791 has five significant figures
D. 5.119 has four significant figures
E. 100 has three significant figures.
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Which piece of lab equipment would be most useful for the following task: Heat a beaker of water when a gas line is not available to power any equipment?
answer choices
Hot plate
Digital scale
Beaker
Mortar and pestle
To heat a beaker of water when a gas line is not present we can use hot plate instead in the given scenario.
In the laboratory, hot plates are frequently used for a variety of tasks, including heating samples and conducting chemical reactions. The idea of a hot plate is straightforward: it is a flat surface with heating elements. They are suitable for use in oil or sand baths and do not produce open flames. When heating samples, the hot plate system with a stirrer offers greater temperature uniformity. For precise temperature heating in chemistry and biology, a laboratory hot plate is typically used. Use aluminium plates if you need to work with temperatures between 300 and 400 degrees Celsius as your maximum required working temperature.
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if the specific gravity of the mixture is 0.781, what are the w/v concentrations of lactic acid, salicylic acid, and trichloroacetic acid in the mixture?
What are the relative w/v concentrations of lactic acid, citric acid, and boric acid if the mixture's specific gravity is 0.781? What are the % weight-to-volume conversions if the mixture's specific gravity is 0.781?
(Density of the solution / Water Density)
density of mixture = (specific gravity of mixed * density of waters) = (0.781 * 1) = 0.781 g/mL density = (mass/volume) specific gravity = 0.781
Lactic acid concentration in the mixture = (mass of latic acid / quantity of mixture) *100 = (4/128.04)100 = 3.12%. Volume of mixture = (mass / density) = (100 /0.781) =128.04 mL.
What level of fluoride ion should be present in drinking water?
Detailed Solution: 1 mg/l
1.50 mg per liter is the proper answer. The World Health Assembly advised that the maximum allowed level of fluoride present in drinking water for a number of nations, including Canada, China, India, Argentina, and the European Union, be 1.5 mg/l. A fluoride level of 1 mg/l is ideal for drinking water.
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The w/v levels of lactic acid, benzoyl peroxide, plus trichloroacetic acid as in combination are 1.56% if the mixture has a specific gravity of 0.781.
What level of fluoride ion should be present in drinking water?1 mg/l 1.50 mg per liter is the proper answer. The World Health Assembly advised that the maximum allowed level of fluoride present in drinking water for a number of nations, including Canada, China, India, Argentina, and the European Union, be 1.5 mg/l. A fluoride level of 1 mg/l is ideal for drinking water.
(Density of solution / Water Density) = Specific Gravity
density of mixture = (specific gravity of mixed * densities of water) = (0.781 * 1) = 0.781 g/mL density = (mass/volume) specific gravity = 0.781
Volume of the mixture = (Mass of Lactic Acid / Volume of the mixture) = (100 /0.781) =128.04 mL w/v Amount of Lactic in the mixture Salicylic acid concentration in the mixture is *100 = (4/128.04)100 = 3.12% w/v = (mass of Salicylic / volume of mixture). Trichloroacetic acid concentration in the combination: *100 =(5/128.04)100 = 3.9% w/v (i.e., (mass of Trichloroacetic acid / volume of mixture) *100 =(2/128.04)100 = 1.56%
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40 points will give brainliest!!
0.50 moles of gas take up 10.5 L
of space under constant pressure
and temperature conditions.
What volume is required to hold
2.0 moles of the gas?
Answer:
The volume required to hold 2.0 moles of the gas is 21 L. This is because the volume of a gas is directly proportional to the number of moles of gas present (provided that the temperature and pressure remain constant). Therefore, if 0.50 moles of gas takes up 10.5 L of space, then 2.0 moles of the gas would take up 2 * 10.5 L = 21 L of space. This proportionality can be expressed mathematically as:
V1/n1=V2/n2
Where V1 and V2 are the volumes of the gases, n1 and n2 are the number of moles of the gases, and the temperature and pressure are constant.
Answer:
The volume required to hold two moles of the gas is 42 L
Explanation:
By using ratio set up of moles and volume;
moles : volume
0.50 : 10.5
2.0 : X
Thus X would be equal to:
(2.0 x 10.5)/0.50
= 21/0.50
= 42 L
In an ice crystal, any single water molecule typically forms hydrogen bonds with how many other water molecules?
A. 2
B. 3
C. 4
D. 5
E. 6
In the ice crystal, there are four more water molecules.Each water molecule has the ability to create four hydrogen bonds.
Ice crystals: Do they have hydrogen bonds?Water molecules are separated from one another more widely in ice than they are in liquid water due to the regular array of hydrogen bonds that make up the crystalline lattice of ice. This explains why water loses density as it freezes.Each water molecule has the ability to create four hydrogen bonds: two between its hydrogen atoms and the hydrogen atoms of its neighbors, plus two more. In natural ice, these four hydrogen bonds form an ideal tetrahedral arrangement around each water molecule (see right).In the ice crystal, there are four more water molecules.To learn more about hydrogen bonds refer to:
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the three states of matter are solid, liquid, and gas. in which state does matter take up the most volume? a. they all take up the same volume. b. in the gas state c. in the liquid state d. in the solid state
We are know that gas takes the shape of the container it is kept in. As a result, matter occupies the largest volume in the gaseous state.
What do you mean by matter?Matter is anything that occupies space and has mass, in other sense, matter is the "something" from whichthe universe is formed. The fundamental building components of all stuff are called elements. They don't change into the other elements through normal chemical processes and have distinct chemical and physical properties.
State of matter.The 3 states of matter include solid, liquid, & gas. It is possible to comprehend why they have various qualities by looking at the arrangement of their particles.
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A molecular compound has the empirical formula XY3. Which of the following is a possible molecular formula? a. X2Y3
b. X2Y6
c. XY4
d. X2Y5
An empirical formula is the simplest ratio of atoms in a chemical compound, it gives the lowest whole number ratio of atoms in a compound. A molecular formula is the actual number of atoms of each element in a molecule.
In this case, the empirical formula XY3 gives the ratio of atoms in the compound, but not the actual number of atoms. The molecular formula of the compound can be a multiple of the empirical formula.
A possible molecular formula for the compound with the empirical formula XY3 is:
b. X2Y6: This is a possible molecular formula for the compound, as it is a multiple of the empirical formula, and it matches the ratio of atoms in the compound.
This is because, in order to obtain the molecular formula, you need to know the molecular weight or the molar mass, which can be obtained by isotopic analysis or other methods, once you have the molecular weight, you can calculate the number of atoms of each element in the compound.
Balance the following equation:
K2CrO4+Na2SO3+HCl→KCl+Na2SO4+CrCl3+H2O.
Generally coefficients of 1 are omitted from balanced chemical equations. When entering your answer, include coefficients of 1 as required for grading purposes.
Enter the coefficients for each compound, separated by commas, in the order in which they appear in the equation (e.g., 1,2,3,4,5,6,7).
In the process of oxidizing I− to I2, SO42− is reduced to SO2. How many moles of SO2 are produced in the formation of one mole of I2?
Express your answer numerically in moles.
Concepts and reason
The problem is based on the concept of balancing a chemical equation.
Fundamentals
A balanced chemical equation is the one which has equal number of atoms of elements on the reactant’s side as well as the product’s side of the equation. When an equation is balanced, it then obeys the law of conservation of mass. There are different types of methods to balance a chemical equation like inspection, algebraic, and oxidation number method.
The balanced equation will be K₂CrO₄ + Na₂SO₃ + 2HCl → 2KCl + Na₂SO₄ + CrCl₃ + H₂O.
A balanced chemical equation is a chemical reaction that has equal numbers of moles of chemical substances both in the reactant and the product side.
K₂CrO₄ + Na₂SO₃ + HCl → KCl + Na₂SO₄ + CrCl₃ + H₂O.
Notice that there are two K atoms on the left and one on the right, two Cr atoms on the left and one on the right, four O atoms on the left and one on the right, two Na atoms on the left and two on the right, three S atoms on the left and one on the right, and one H atom on the left and one on the right.
Balance the K atoms, by adding a coefficient of 2 in front of the KCl on the right side of the equation. To balance the Cr atoms, we can add a coefficient of 2 in front of the CrCl3 on the right side of the equation. To balance the O atoms, we can add a coefficient of 3 in front of the H2O on the right side of the equation. To balance the Na atoms, we don't need to add any coefficient. To balance the S atoms, we don't need to add any coefficient. To balance the H atoms, we can add a coefficient of 2 in front of the HCl on the left side of the equation.
The coefficients are now in the smallest whole-number ratio possible.
Check if the equation is now balanced.
So, the balanced equation is: K₂CrO₄ + Na₂SO₃ + 2HCl → 2KCl + Na₂SO₄ + CrCl₃ + H₂O.
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which of the subshells i) 2 d ii) 3 f iii) 5 g iv) 6 i cannot exist in an atom? select all that apply
Out of all the given subshells it is 2d shell which doesn't have real existence as an atom.
(i) If d-subshell l=2, the values of sof l in the second shell (jn=2) are 0 and 1. Consequently, the third shell cannot contain any d-subshell. As a result, we can conclude that the second subshell does not actually exist as atom.
(ii) In the third shell (n=3), the values of l are 0, 1, and 2 in the case of the f-subshell, where l=3. There is no actual existence of 3f-subhsell because there cannot be any f-subshell in this shell.
(iii) In the fourth shell (n=4), where l=4, the values of l are 0, 1, 2, and 3. There is no actual 4g subshell because there cannot be any g sub shell in this shell.
(iv) The fifth shell (n=5) has l values of 0, 1, 2, 3, and 4, which proves that the d-sub shell is actually present
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How many moles of potassium bromide, KBr, are in 0.250 L of a 2.00 M solution?
The number of moles of a salt in a solution is the product of its volume in liter and molarity. Hence, number of moles of potassium bromide, KBr, are in 0.250 L of a 2.00 M solution is 0.5.
What is molarity ?Molarity of a solution is the ratio of the number of moles of its solute to the volume of solution in liter.
To determine the number of moles of potassium bromide (KBr) in a 0.250 L of a 2.00 M solution, we can use the formula:
moles = concentration x volume
where concentration is in units of moles per liter (M), and volume is in liters (L).
Substituting the given values into the formula, we get:
moles = 2.00 M x 0.250 L
= 0.500 mol
Therefore, there are 0.500 moles of KBr in 0.250 L of a 2.00 M solution.
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Answer:
0.5
Explanation:
Acellus
a mixture of coarse sand and sugar is 45.0 percent sand by mass. 120.0 grams (g) of the mixture is placed in a fine-mesh cloth bag and dunked repeatedly in lake michigan. after drying, the mass of the contents of the bag equals:
After drying, the mass of the contents of the bag equals is X=54g if 45.0 percent sand by mass. 120.0 grams of the mixture is placed in a fine .
Why does mass mean?6vmass, the central act of worship of the Roman Catholic Church, which culminates in celebration of the sacrament of the Eucharist. The term mass is derived from the ecclesiastical Latin formula for the dismissal of the congregation .
What's mass in physics?mass, in physics, quantitative measure of inertia, a fundamental property of all matter. It is, in effect, the resistance that a body of matter offers to a change in its speed or position upon the application of a force. The greater the mass of a body .
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find the number of grams of co2 that exert a pressure of 785 torr at a volume of 32.5 l and a temperature of 32 celsius
the equation for a ideal gas. PV = nRT, n=PVRT, n=1.34 mol, n=785 torr, 32.5 L62.36 L torr, and (32 + 273) K.
Explain what an ideal gas is.
The definition of an ideal gas is a gas in which the volume of the molecules and the forces between the molecules are so minimal as to not affect the behavior of the gas.
What is an example of ideal gas?
Many gases, including nitrogen, oxygen, hydrogen, noble gases, some heavier gases like carbon dioxide, and mixtures like air, can be classified as ideal gases if certain parameters are kept within reasonable limits over a wide range of temperatures and pressures.
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calculate the volume in milliliters of a 1.33 m calcium bromide solution that contains of calcium bromide . be sure your answer has the correct number of significant digits.
The volume of 1.33 mol/L calcium bromide solution that contains 125 g of calcium bromide is 470 mL
The volume can be calculate as follows:
First we should calculate the moles of calcium bromide
The moles of calcium bromide = Mass/ mass molar
The moles of calcium bromide = 125 g / 199.89 g/mol
The moles of calcium bromide = 0.625 moles
from de question we know that the molar of the solution is 1.33 mol/l
we also know that Molar = moles/ volume
so the volume is gonna be
volume= moles/ molar
volume = 0.625 moles/ 1.33 mol/L = 0.47 L = 470 mL
Therefore, the volume of 1.33 mol/L calcium bromide solution that contains 125 g of calcium bromide is 470 mL
Your question is incomplete but most probably your full question was
calculate the volume in milliliters of a 1.33 mol/L calcium bromide solution that contains 125 g of calcium bromide . be sure your answer has the correct number of significant digits.
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Pansy has measured the volume of a sample of oxygen gas and has found that she has a total of 9.03 moles of the gas. What is the mass of this sample of oxygen gas? Please round your answer to two digits after the decimal point, and remember to include correct, complete units (including substance formula).
Answer:
Pansy has measured the volume of a sample of oxygen gas and has found that she has a total of 13.44 moles of the gas. What is the mass of this
Explanation:
n=m/Mr. m= nxMr = 13.44 x 32 = 430.08 g of oxygen
A 25 cm3 sample of hydrochloric acid with an unknown concentration was titrated against a solution of sodium hydroxide with a concentration of 0.1 mol/dm3. It took exactly 23.5 cm3 of sodium hydroxide to neutralise the acid.
i. Write the balanced equation for the reaction.
ii. How many moles of HCl must be present in the 25 cm3 sample? Explain how you
reached this value.
iii. Calculate the concentration of the HCl solution.
Answer: it is b i got it right on the test
Explanation:
How many grams of C4H10 must I burn to produce .86 grams of waterHelp me i need this done ASAP im taking my final rn
Answer: 0.545 grams of [tex]C_{4} H_{10}[/tex] on burning will give 0.86 grams of water.
Explanation: The molecular mass of water is 18 grams/mole.
therefore, 0.86 grams of water = 0.86/18 (mass/molecular weight)
= 0.047 moles
Now, by unitary method :
Since by the equation, We can already tell 10 moles of water is produced by burning 2 moles of C_{4} H_{10}.
∴ 10 moles of water → 2 moles of C2H10
1 mole of water → 2/10 moles of C2H10
0.047 Moles of water → 0.047 x (2/10) moles of C2H10
∴ We will need 0.0094 Moles of C2H10 to produce 0.86 grams of water which is 0.545 Grams (moles x Molecular mass = required weight)
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2H₂ + O2 --> 2H₂O
If you have 16 moles of Hydrogen gas (H₂), how many moles of Oxygen gas (0₂) will
you need to make as much water as possible?
(Enter just the number; not the number and units)
Your Answer:
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 8moles of Oxygen gas (0₂) will be needed to make as much water as possible.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
2H₂ + O[tex]_2[/tex] [tex]\rightarrow[/tex] 2H₂O
the mole ratio between oxygen and hydrogen is 1:2
mole of oxygen =1/2 mole of hydrogen = 8moles
Therefore, 8moles of Oxygen gas (0₂) will be needed to make as much water as possible.
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the half-life of a reaction of compound a to give compounds d and e is 8.50 min when the initial concentration of a is 0.150 m. how long will it take for the concentration to drop to 0.0300 m if the reaction is (a) first order with respect to a or (b) second order with respect to a?
It will take 20.33 min in the first order for the concentration to drop to 0.0300 M and 11.8 min for the concentration to drop to 0.0300 M in the second order.
What is compound?A substance created by chemically joining two or more different elements. Examples of compounds are table salt (NaCl), which is made from the elements sodium and chloride, and water (H2O), which is created from the elements hydrogen and oxygen.
(a) First order with respect to A:
The half-life of a first-order reaction is constant and does not depend on the initial concentration of the reactant. Therefore, we can use the half-life formula:
t1/2 = 0.693/k, where k is the rate constant of the reaction.
We are given that the half-life of the reaction is 8.50 min when the initial concentration of A is 0.150 M.
Since we know the half-life of the reaction, we can find the rate constant, k = 0.693/8.50 = 0.081 min^-1
To find how long it takes for the concentration of A to drop to 0.0300 M, we can use the formula:
[A]t = [A]0 * e^(-kt)
where [A]t is the concentration of A at time t, [A]0 is the initial concentration of A, k is the rate constant, and t is the time in minutes.
Plugging in the given values and solving for t, we get:
t = (ln (0.0300/0.150)) / (-0.081) = 20.33 min
For (b) Second order with respect to A:
The half-life of a second-order reaction is dependent on the initial concentration of the reactant.
t1/2 = 1/(k[A]) = 8.50 min
By solving for k, we can find k = 1/(8.5*0.15) = 0.0118 min^-1M^-1
To find how long it takes for the concentration of A to drop to 0.0300 M, we can use the formula:
1/[A]t = 1/[A]0 + kt
Plugging in the given values and solving for t, we get:
t = (1/0.0300 - 1/0.150) / 0.0118 = 11.8 min
Therefore, if the reaction is first order with respect to A it will take 20.33 min for the concentration to drop to 0.0300 M, and if the reaction is second order with respect to A it will take 11.8 min for the concentration to drop to 0.0300 M.
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Use dimensional analysis, to calculate how many moles of nitrogen monoxide are produced if 13 moles of oxygen gas are reacted.
Number of moles of Nitrogen monoxide produced when 13 moles of of oxygen is reacted is 26 moles.
Dimensional analysis in chemical reaction means equating both sides of the equation and deriving relationships, so that we can calculate the required quantities.
Nitrogen and oxygen in the air, while events like lightening reacts together to form Nitrogen monoxide. The reaction is as follows.
N₂ + O₂ ------- NO
By equating the reaction we get
N₂ + O₂ ------- 2NO
1 mole of nitrogen reacts with one mole of oxygen to get 2 moles of Nitrogen monoxide.
So when 13 moles of oxygen reacts 2× 13 moles of Nitrogen monoxide is formed. That is 26 moles.
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The tabulated data were collected for this reaction:
CH3Cl(g) + 3Cl2(g) → CCl4(g) + 3HCl(g)
[CH3Cl] (M) [Cl2] (M) Initial Rate (M/s)
0.050 0.050 0.014
0.100 0.050 0.029
0.100 0.100 0.041
0.200 0.200 0.115
The rate law is for this reaction is r= k [CH₃Cl][Cl₂]⁻⁰⁵ M s⁻¹
where the rate constant is k = 1.25 and the overall order of the reaction is 1.5.
An equation that connects the rate of a chemical reaction to the concentrations of the reactants is known as the rate law.
The reaction's rate law is as follows:
r = k [CH₃Cl]ᵃ [Cl₂]ᵇ
where,
r is the initial rate.
k is the rate constant.
a is the reaction order for CH₃Cl.
b is the reaction order for Cl₂.
If we write the ratio r₂/r₁, we get:
r₂/r₁ = k [CH₃Cl]₂ᵃ [Cl₂]₂ᵇ / k [CH₃Cl]₁ᵃ [Cl₂]₁ᵇ
r₂/r₁ = {[CH₃Cl]₂/ [CH₃Cl]₁}ᵃ
(0.029 M/s)/(0.014 M/s) = {0.100M/0.050 M}ᵃ
a ≈ 1
If we write the ratio r₃/r₂, we get:
r₃/r₂ = k [CH₃Cl]₃ᵃ [Cl₂]₃ᵇ / k [CH₃Cl]₂ᵃ [Cl₂]₂ᵇ
r₃/r₂ = {[Cl₂]₃/[Cl₂]₂}ᵇ
(0.041 M/s)/(0.029 M/s) = {0.100 M/0.050 M}ᵇ
b ≈ 0.5
So far, the rate law is:
r= k[CH₃Cl][Cl₂]⁰⁵
your question is incomplete but most probably your full question was
The tabulated data were collected for this reaction:
CH3Cl(g) + 3Cl2(g) → CCl4(g) + 3HCl(g)
[CH3Cl] (M) [Cl2] (M) Initial Rate (M/s)
0.050 0.050 0.014
0.100 0.050 0.029
0.100 0.100 0.041
0.200 0.200 0.115
(a) Write an expression for the reaction rate law and calculate the value of the rate constant, k.
(b) What is the overall order of the reaction?
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An electron is placed just above the surface of the Earth. In which direction (upwards or downwards) must an electric field be applied to keep the electron stationary?
answer choices
upwards
downwards
The Earth's surface is covered with an electron. To maintain the electron immobile, an electric field must always be applied downward.
Who or what is an electron?A negative charge subatomic particle known as an electron can either be free or attached to an atom. One of the three main types nuclear particles within an atom is an ion that is bonded to it; some other two are neutrons and protons.
In how many atoms do electrons consist?For dispassionately charged species, the concentration of electrons within an atom is similar to the atomic weight of an element. This indicates that an element has an equal amount of both protons and electrons. Consequently, oxygen contains 8 electrons.
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3.122 if a container were to have 10 moleucles of o2 and 10 molecules of nh3 how many total molecules p would bbe present in the ocntainer after this reaction goes to completion
64 molecules will be present in the container after the reaction is completed.
What is meant by reactant and product?The reaction of compounds and molecules occurs in the presence of the reactants and produces products through various means.
The reaction is : 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)
We can see that 5 molecules of oxygen are present for 4 molecules of ammonia.
If the container had initially, 10 molecules of oxygen and 52 molecules of ammonia then,
As 4 molecules of NH3 reacts with 5 molecules of O2
52 molecules of NH3 reacts with X molecules of O2
we get, X= 52 *5/4
So, 65 molecules of O2
From this, it can be said that the oxygen is the limiting reagent;
And 5 molecules of O2 reacts with 4 molecules of NH3
10 molecules O2 reacts with X molecules of NH3
X for Ammonia:
X = 4* 10/5
So, 8 molecules of NH3
As, 5 molecules of O2 = 4 molecules of NO
and 10 molecules of O2 = X molecules of NO
X for nitric oxide:
X = 4* 10/5
So, 8 molecules of NO
As, 5 molecules of = 6 molecules of
and 10 molecules of = X molecules of
X for water
X = 4* 10/5
So, 8 molecules of H2O
Total molecules will be:
44 molecules of NH3 + 8molecules of + 12 molecules of H2O = 64 molecules
Hence 64 molecules are produced.
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Explain the effect of change in preure on the volume of a ga, temperature remain
contant
As the pressure on an increases, the volume of a gas declines because the gas atoms are forced closer together.
How do you find pressure?Let's first go through PV = nRT, the ideal gas law. P stands for pressure in atmospheres, V for volume in liters, n for moles of particles, T for temperature in Kelvin, and R for the ideal gas constant in this equation (0.0821 liter atmospheres per moles Kelvin).
How does pressure change during a reaction?What impact does pressure have on the reaction's speed? Pressure raises the concentration of the gases, which raises the pace of reaction. The reaction rate falls in the opposite direction and rises in the direction of less gaseous molecules.
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Direct Measurement Method Mass (g) Magnet 25 05 Length (cm) Width (cm) Height (cm) Volume (cm) Density (g/cm) 05
the density of the magnet using the direct measurement method is
0.2 g/cm^3
To calculate the density of the magnet using the direct measurement method, we use the following formula: Density = Mass / Volume. First we need to calculate the volume of the magnet. Since the magnet has a rectangular shape, we can use the formula for the volume of a rectangular prism: Volume = Length x Width x Height. In this case, the length, width, and height of the magnet are given as 5 cm, 5 cm, and 5 cm respectively. So the volume of the magnet is:Volume = 5 cm x 5 cm x 5 cm = 125 cm^3. Now we can calculate the density of the magnet: Density = Mass / Volume = 25 g / 125 cm^3 = 0.2 g/cm^3. So the density of the magnet is 0.2 g/cm^3. It's worth noting that the volume should be in the same unit as the mass, and the density should be in g/cm^3, otherwise the result will be wrong.
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in all of these analyses the energy gained and lost was balanced. what would happen if this was no longer in balance?
Energy balance on Earth. You are aware that the Earth's surface equally absorbs and emits radiation. At 255F o (-18°C or 0°F), the rate of Humanity's emission and absorption are balanced.
What is the atmosphere's radiation balance?While some atmospheric gases absorb certain wavelengths of radiation, converting their energy into heat, other gases are transparent, allowing radiation to travel freely through them without being absorbed.
What causes the imbalance in energy?"An expected result of rising levels of air pollution, particularly those from carbon dioxide, methanol, aerosol, and black carbon particles, is the energy imbalance. These contaminants increase solar absorption and prevent heat radiation from the Earth from escaping into space "Jim Hansen from NASA's Goddard Space Flight Center.
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a chemist mixes two liquids, a and b, to form a homogeneous mixture. the densities of the liquids are 2.0514 g/ml for a and 2.6678 g/ml for b. when she drops a small object into the mixture, she finds that the object becomes suspended in the liquid; that is, it neither sinks nor floats. if the mixture is made of 41.37 percent a and 58.63 percent b by volume, what is the density of the metal?
If the mixture is made of 41.37 percent a and 58.63 percent by volume, then the density of the object is calculated as 1.9302 g/mL.
What is density?Density is a mass of a unit volume of a material substance. It is commonly expressed in units of grams per cubic centimeter.
Given, vA = 413.7 mL and vB = 586.3 mL
total (A+B) density = mass AB / volume AB
As, mAB = mA + mB
mA = vA * dA = 413.7 mL * 2.0514 g/mL
= 848.664 g A
mB = vB * dB = 586.3 mL * 2.6678 g/mL
= 1564.13 g B
Hence, mAB = 2412.795 g AB
total density = 2412.795 g / 1000 mL = 2.4127 g/mL AB
Use principle of Archimedes' to find the density of a solid suspended in a liquid:
E = dAB * g * Vs
Vs is submerged solid volume; E : fluid weight displaced by the solid
and dAB : mix density ; g : gravity
As, ∑F = 0
E - Wsolid = 0
Hence, E = Wsolid
∴ Wsolid = msolid * g
Now, msolid * g = dAB * g * Vs
msolid = dsolid * Vs
So, msolid = dsolid * Vsolid
Assuming that 80% of solid is submerged in mixture, we have: Vs = 0.8 * Vsolid
Then, dsolid * Vsolid = dAB * 0.8 * Vsolid
dsolid = dAB * o.8
dsolid = 2.4127 g/mL * 0.8
So, dsolid = 1.9302 g/mL
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what is the strongest type of intermolecular force present between two nh2ch3 molecules? (en values: n
The strongest type of intermolecular force present between two NH2CH3 is Hydrogen bonding.
The intermolecular force is an electrostatic attraction between positive and negative poles of molecules. The electrostatic force is directly proportional to the strength of a physical property. The strength of an intermolecular force based on the magnitude of the charges and the distance between each other. strongest type of intermolecular force in methylamine is Hydrogen bonding. Hydrogen bonding is a special type of dipole-dipole force. It arises between the H atom bonded to an N, O, F atom of one molecule and the N, O, F atom of another. It is stronger than dipole-dipole forces. it is due to the electronegativity of the N, O, and F atoms and the polarity between the electronegative atoms and the H atom.
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A sealed flask contains neon, argon, and krypton gas. if the total pressure in the flask is 3.782 atm, the partial pressure of ne is 0.435 atm, and the partial pressure of kr is 1.613 atm, what is the partial pressure of ar?
multiple choice question.
a)
Ar's partial pressure is 1.734 atm. if the gases neon, argon, and krypton are present in a sealed flask. If the flask's overall pressure is 3.782 atm, ne's partial pressure is 0.435 atm, and kr's partial pressure is 1.613 atm,
The partial pressure formula: what is it?One of two methods can be used to compute partial pressures: 1) Use PV = nRT to calculate the individual pressure of each gas in a mixture. 2)Determine the proportion of pressure from the total pressure that may be assigned to each individual gas by using the mole fraction of each gas.
Why is partial pressure significant, and what is it?Each gas in a mixture adds to the overall pressure of the mixture. This portion represents the pressure. The pressure a gas would have if it were in its own volume and at its own temperature is known as the partial pressure.
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What is the empirical formula of the compound: C5H5N5?
Select one:
a.C5H5N5
b.C2H2N2
c.CHN
Answer:
The correct answer is a. C5H5N5
Explanation:
The empirical formula of a compound is the simplest whole number ratio of the atoms of each element in the compound. In this case, the empirical formula of the compound C5H5N5 is C5H5N5, which is the simplest whole number ratio of the atoms of carbon, hydrogen, and nitrogen in the compound.
an ionic compound forms when calcium reacts with iodine . if a sample of the compound contains calcium ions, how many iodide ions does it contain? round your answer to significant digits.
If a sample of the compound contains calcium ions, then iodide ions that it contains is 14.8 x 10^21.
What are the ionic compounds?Ionic compounds are those that have ionic bonding between elements with significant differences in their electronegativity.
The stronger the attraction between the cation and anion, the bigger the difference. Due to strength and the amount of energy required to break them, they have high melting and boiling points.
These substances crystallize into brittle, easily breakable tiny bits. Generally speaking, electrovalent substances dissolve in water but are insoluble in solvents like oil, gasoline, kerosene, etc.
Given 7.4 x 10^21 calcium ions.
Hence, the number of iodide ions is 2 * 7.4 x 10^21 = 14.8 x 10^21.
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Note: The question given on the portal is not complete. Here is the complete question.
Question: An ionic compound forms when calcium reacts with iodine. If a sample of the compound contains 7.4 x 10^21 calcium ions, how many iodide ions does it contain
