Answer:
Anhydrous calcium nitrate reaction with water is highly endothermic
I have a mixture of sand salt and water from the sea. Describe in detail how I separate these three substances and explain why each method works
Answer:
You can separate a mixture of sand, salt and water by decantation and evaporation. Decantation will separate sand from salt and water. Sand remains in the original vessel, whereas salt and water is transfered to new vessel. Evaporation will separate salt from water.
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Answer:
2 NaI ---> 2 Na + I₂
Explanation:
The only way the reactant NaI can decompose is by separating into 2 atoms, Na and I. However, you must take into account that iodine (I) exists as a diatomic molecule.
An equation is balanced when there is an equal amount of each element on both sides of the reaction. These amounts can be modified by adding coefficients in from of the molecules/atoms.
The unbalanced equation:
NaI -----> Na + I₂
Reactants: 1 sodium, 1 iodine
Products: 1 sodium, 2 iodine
The balanced equation:
2 NaI ---> 2 Na + I₂
Reactants: 2 sodium, 2 iodine
Products: 2 sodium, 2 iodine
What non-metal has less than 4 valence electrons (Outmost cells electrons)?
Correct Answer: Boron family
This family (ethane, propane, butane, etc) of materials is likely to have what set of properties?
This family (ethane, propane, butane, etc) of materials is likely to have following set of properties.
The alkanes are non- polar solvents.The alkanes are immiscible in water but freely miscible in other non-polar solvent .The alkanes are consisting of weak dipole dipole bonds can not breaks the strong hydrogen bond.The alkanes having only carbon (C) and hydrogen (H) atom which is bonded by a single bonds only.The alkanes posses weak force of attraction that is weak van der waals force of attraction.The ethane, propane, butane, belong to alkanes family.The alkanes are also considers as saturated hudrocarbons. Ethane is found in gaseous stae Ethane is the second alkane followed by propane followed by butane.
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The chemical formula H2O represents one molecule of water.
How many total atoms are present in this molecule? Use the words atom, molecule, and subscript in your answer.
There is a total of three atoms present in the water (H₂O) molecule.
What is an atom?An atom is the smallest particle of an element that may or may not be capable of independent existence.
What is a molecule?A molecule is the smallest particle of an element or compound that can exist freely.
What is a subscript?Subscripts are the numbers that come below after a symbol. They tell you the number of atoms of an element. If there is no subscript then it is understood that the subscript is 1.
How to calculate the number of atoms in a molecule?For calculating the number of atoms in a molecule, add the subscripts of that molecule, and you will get the total atoms of it.
For example, in molecule C₂H₅O, there are 2 carbon atoms, 5 hydrogen atoms, and 1 oxygen atom.
Add the subscripts
2 + 5 + 1 = 8
Hence, there is a total of 8 atoms in C₂H₅O.
For the H₂O molecule,
2 + 1 = 3
Hence, there is a total of 3 atoms present in one water molecule.
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Ethylene glycol has a specific heat of 0. 578 cal/(g•°c). if 23. 2 g of ethylene glycol absorbs 75. 6 cal of heat energy, what will the temperature increase be?
Ethylene glycol has a specific heat of 0. 578 cal/(g°c). If 23.2 g of ethylene glycol absorbs 75.6 cal of heat energy. The temperature increase be 5.64°C.
What is Specific Heat ?The amount of heat needed to raise the temperature of 1 kg of substance.
It is expressed as
Q = mcΔT
where,
Q = Heat energy
m = Mass
c = Specific heat capacity
ΔT = Change in temperature.
Here,
Q = 75.6 cal
m = 23.3 g
c = 578 cal/(g°c)
Now put the values in above formula we get
Q = mcΔT
75.6 cal = 23.2 g × 578 cal/(g°c) × ΔT
ΔT = 5.64°C
Thus from the above conclusion we can say that Ethylene glycol has a specific heat of 0. 578 cal/(g°c). If 23.2 g of ethylene glycol absorbs 75.6 cal of heat energy. The temperature increase be 5.64°C.
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What can be said about this reaction when the concentration of 2-phosphoglycerate is 0.490 mm and the concentration of 3-phosphoglycerate is 2.90 mm at 25°c?
The reaction is at equilibrium. Option C
What is the equilibrium constant?The term equilibrium constant refers to a value that shows the extent to which reactants are converted into products in the reaction.
We know that;
∆G =∆G'° + RT In Keq
∆G'° = −4.40 kJ/mol
R = 8.314 J/K/mol
T = 25 + 273 = 298 K
Thus;
∆G = −4.40 * 10^3 + (8.314 * 298 * ln[2.90 * 10^-3/0.490 * 10^-3]
∆G = −4.40 * 10^3 + 4.40 * 10^3
∆G = 0
Hence, the reaction is at equilibrium.
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1) Consider the following metabolic reaction:
2-Phosphoglycerate ® 3-Phosphoglycerate DG°' = −4.40 kJ/mol
What can be said about this reaction when the concentration of 2-phosphoglycerate is 0.490 mM and the concentration of 3-phosphoglycerate is 2.90 mM at 25°C?
I. This reaction is endergonic under these conditions.
II. This reaction is exergonic under these conditions.
III. This reaction is at equilibrium under these conditions.
IV. This reaction is not favorable under standard conditions.
A) I, IV
B) II only
C) III only
D) IV only
E) None of the above
2) Consider the following metabolic reaction:
A substance decays so that the amount a of the substance left at time t is given by: a = a0 ∙ (0.8)t where a0 is the original amount of the substance. what is the half-life (the amount of time that it takes to decay to half the original amount) of this substance rounded to the nearest tenth of a year?
The half-life of the substance is 3.106 years.
What is the formula for exponential decay?The exponential decline, which is a rapid reduction over time, can be calculated with the use of the exponential decay formula. The exponential decay formula is used to determine population decay, half-life, radioactivity decay, and other phenomena. The general form is F(x) = a.Here,
a = the initial amount of substance
1-r is the decay rate
x = time span
The equation is given in its correct form as follows:
a = [tex]a_{0}[/tex]×[tex](0.8)^{t}[/tex]
As this is an exponential decay of a first order reaction, t is an exponent of 0.8.
Now let's figure out the half life. Since the amount left is half of the initial amount at time t, that is when:
a = 0.5 a0
Substituting this into the equation:0.5[tex]a_{0}[/tex] = [tex]a_{0}[/tex]×[tex](0.8)^{t}[/tex]
0.5 = [tex](0.8)^{t}[/tex]
taking log on both sides
t log 0.8 = log 0.5
t = log 0.5/log 0.8
t = 3.106 years
The half-life of the substance is 3.106 years.
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What is formed as air masses move horizontally in response to differences in air pressure?
Low pressure region is formed as air masses move horizontally
What is air mass?Basically, an air mass is a volume of air that is doing something. A high pressure region and a low pressure area on a weather chart are examples of air masses. It may be the cloud burst that you were recently trapped in. Essentially a description of a zone that behaves consistently.
The horizontal motion of air is known as wind. When there are variations in air pressure, winds begin to blow. A force is created when air pressure is higher in one location than another. High pressure pushes the force in the direction of lower pressure.
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The element lithium (Li) has 3 protons and 3 electrons. The element fluorine (F) has 9 protons and 9 electrons. An atom of the element lithium (Li) transfers an electron to an atom of the element fluorine (F). Which type of bond results between the atoms, and what happens to the charges in each of the atoms?
When an atom of the element lithium (Li) transfers an electron to an atom of the element fluorine (F), then the bond results between the atoms is ionic bond.
what is chemical bond?A chemical bond is defined as the bond which holds atoms together in molecules.
Bonds arise due to the electrostatic forces present between positively charged atomic nuclei and negatively charged electrons.
Types of chemical bondIonic bondCovalent bondCoordinate bondWhat is Ionic bond ?Ionic bond is defined as the transfer of electron from one atom to another atom.
Since, electron transfer from lithium to fluroine. Thus lithium get positive charge and fluorine occupy negative charge.
Thus, the bond form between lithium atom and fluorine atom is ionic bond.
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In an experiment, 10.0 g of magnesium reacted with excess hydrochloric acid forming magnesium chloride. Mg(s) +2HCl(aq) → MgCl2(aq) +H2(g)
At the completion of the reaction, 29.5 g of magnesium chloride was produced. Calculate the percent yield. (Pls help)
Answer: 75.3%
Explanation:
Mg molar mass = 24
MgCl2 molar mass = 94
—> 94 x 10 / 24
29.5/1 x 24/94 x 10
= 29.5 x 24 / 94 x 10
since we are looking for percentage yield we multiply by 100
= 29.5 x 24 x 100 / 94 x 10 = 75.3%
In the laboratory, a student dilutes 18. 9 ml of a 10. 0 m perchloric acid solution to a total volume of 250. 0 ml. what is the concentration of the diluted solution? concentration = m submit answer
The concentration of diluted solution is 0.756M.
From the question given above, the following data were obtained:
Volume of stock solution (V1) = 18.9 mL
Molarity of stock solution (M1) = 10 M
Volume of diluted solution (V2) = 250 mL
Molarity of diluted solution (M2) =?
We can obtain the molarity of the diluted solution by using the dilution formula as shown follow:
M1V1 = M2V2
10 × 18.9 = M2 ×250
189 = M2 × 250
Divide both side by 100
M2 = 189 / 250
M2 = 0.756 M
Therefore, the molarity of the diluted solution is 0.756 M.
Thus the concluded that concentration of the dilute acid is 0.756 M.
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A bumblebee carries pollen from the male portion of a plant to the female portion of the similar plant. Fertilization occurs. Which statement is true about this type of reproduction?
Answer:
It’s sexual, and the offspring are genetically different from the parents
Explanation:
Since it is the same flower the bee is pollinating, the progeny will be genetically distinct if the bee were to transfer the pollen to the female part of the flower from the male part.
If the decomposition of a sample of k c l o 3 kclox3 produces 3. 29 g of o 2 ox2 , what was the mass (g) of the original sample?
The mass (g) of the original sample after decomposition is 8.3983 g.
A decomposition reaction can be described as a chemical reaction wherein one reactant breaks down into or extra merchandise.
explanation:
Reaction 2KClO₃ ⇒ 2KCl + 3O₂
moles 2 2 3
molar mass 122.55 74.55 32
Given, Mass of O₂ = 3.29g ⇒ moles of O₂
= (3.29/32) = 0.1028
3 moles of O₂ produced by 2 moles of KClO₃
Therefore, 0.1028 moles of O₂ produced by (2*0.1028/3) = 0.06853 moles of Kclo₃
Mass of KClo₃ in original sample is = moles * molar mass
= 0.06853 * 122.55
= 8.3983 g
A decomposition response occurs whilst one reactant breaks down into or extra merchandise. this may be represented through the general equation: XY → X+ Y. Examples of decomposition reactions consist of the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.
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Finding mole ratios from chemical formulae
This is the chemical formula for nickel tetracarbonyl (a powerfully poisonous liquid used in nickel refining):
Ni(CO)4
A chemical engineer has determined by measurements that there are 93. moles of carbon in a sample of nickel tetracarbonyl. How many moles of oxygen are in
the sample?
Round your answer to 2 significant digits.
7 moles of oxygen are in the sample.
According to the chemical formula, each mole of nickel tetracarbonyl contains 4 moles of C atoms. Simply convert it into a fraction by putting the original solution in the denominator and the diluted solution in the numerator if you need to determine the concentration ratio between two solutions. The V/n ratio for each gas must be the same if the two gases are at the same temperature and pressure. The volume ratio of two gases at the same temperature and pressure is equal to their molar ratio. The mole ratio of C to O is 1 : 1
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Calculate the molarity of the two solutions. The first solution contains 0.650 mol of NaOH in 1.35 L of solution.
Answer:
0.481 M
Explanation:
The molarity ratio looks like this:
Molarity = moles / volume (L)
Since you have been given both the mass and volume, you can plug them into the equation to find the molarity.
Molarity = moles / volume
Molarity = 0.650 moles / 1.35 L
Molarity = 0.481 M
Draw the lewis structure of scl₂ and then determine the hybridization of the central atom
The hybridization of the central atom in SCl₂ is sp³.
What is Lewis Structure ?Lewis structure is also known as Lewis dot structure which simply represent the valence electron of an atom.
What is Hybridization ?Hybridization is defined as the mixing of two atomic orbitals belongs to same atom but having entirely different shapes , energies which produces a new hybridized orbitals.
Now first write the electronic configuration of central atom.
The central atom in SCl₂ is S (Sulphur).
Electronic configuration of S: [Ne] 3s² 3p⁴
One 3s and three 3p undergo hybridization to form sp³ orbitals. Here each atom forms bond with one sp³ hybrid orbital.
Thus from the above conclusion we can say that The hybridization of the central atom in SCl₂ is sp³.
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A solution of naf is added dropwise to a solution that is 0.0122 m in ba2 . when the concentration of f- exceeds ________ m, will precipitate. neglect volume changes. for , ksp = 1.7 x 10-6. 4. calculate the ph of a solution prepared by dissolving 0.270 mol of weak acid ha (ka = 1.77 x 10-4) and 0.260 mol of its conjugate base in water sufficient to yield 1.00 l of solution.
A solution of NaF is added to a solution that is 0.0144 M in Ba²⁺. When the concentration of F- exceeds 0.011 m, BaF₂ will precipitate.
Let's consider the solution of BaF₂.
BaF₂(s) ⇄ Ba²⁺(aq) + 2 F⁻(aq)
We can use the solubility product constant (Ksp) to find the equilibrium concentration of F⁻ when [Ba²⁺] is 0.0144 M.
When [F⁻] exceeds 0.011 M, BaF₂ will precipitate.
A solution of NaF is added to a solution that is 0.0144 M in Ba²⁺. When the concentration of F- exceeds 0.011 M, BaF₂ will precipitate.
What is BaF₂.?
BaF2 crystallizes in the cubic Fm3m space group and has a fluorite structural makeup. Eight comparable F1 atoms and Ba2+ are joined in a cubic shape with the body in the middle. The average Ba-F bond length is 2.72. Four comparable Ba2+ atoms are joined with F1 to create a mixture of corner- and edge-sharing FBa4 tetrahedra.Learn more about BaF2 crystallizes
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What is the result of a chiari type ii malformation associated with a myelomeningocele?
Chiari type ii malformation associated with myelomeningocele can lead to severe morbidity and mortality if it is not identified and treated promptly.
People diagnosed with myelomeningocele have abnormalities of the brain and spine, including spinal cord defects and symptoms related to the area in which the spinal column and the brain meet, known as Chiari malformation. Chiari Type II or Arnold-Chiari malformation is a worse form in which the cerebellar vermis and some portion of the brain stem descend into the cervical chine.
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Calculate the pressure (in atm) exerted by 1.82 moles of a gas in a steel vessel of volume 5.43 l at 69.50 c.
The pressure in atm is 6.8.
Calculation,
According to ideal gas law,
PV = nRT ..(i)
P is pressure = ?V is volume = 5.43 Ln is number of moles = 1.82 moles T is temperature = 69.50°C = 69.50°C + 278 K = 247.50 KR is universal gas constant = 0.082 atm L/K molPutting the value of all given data in equation (i) we get,
P×5.43 L = 1.82 moles ×247.50 K × 0.082 atm L/K mol
P = 1.82 moles ×247.50 K × 0.082 atm L/K mol /5.43 L = 6.8 atm
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If 0. 5371 g of zn was plated onto an electrode, how much charge (in coulombs) was used to reduce the zn2+ to zn(s)?
The amount of charge required to reduce Zn²⁺ to Zn is 1585.26 coulomb.
What is electrolysis?The process that has been equipped with the use of electric current to break the chemical compound and deposited at the constituent electrodes is termed as electrolysis.
The reaction of reduction of Zn can be given as:
Zn²⁺ + 2e⁻ → Zn (s)
Molar mass of Zn = 65.39 g
The equivalent of Zn²⁺ has been:
Equivalent = atomic mass/equivalent weight
Equivalent Zn²⁺ = 65.39/32.69
Equivalent Zn²⁺ = 2 mol
1 equivalent = 1 F charge used
2 mol equivalent = 2 F charge used
Charge in coulomb can be given as:
1 Faraday = 96500 coulomb
2 F = 96500 * 2 coulomb
2 F = 1,93,000 coulomb
The moles of Zn to be deposited is:
Moles = weight /molar weight
Moles = 0.5371 g/ 65.39 g/mol
Moles = 0.00821 mol
Therefore, the charge used for the deposition of 0.00821 mol is:
Charge = 0.00821 * 1,93,000 coulomb
Charge = 1585.26 coulomb
1585.26 coulomb charge was used to reduce the Zn²⁺ to Zn.
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The reaction na 3po 4( aq) 3 agno3( aq) → ag 3po 4( s) 3 nano 3( aq) is best classified as a(n):_____.
The reaction [tex]Na_{3} PO_{4} ( aq) +3AgNO_{3} (aq)[/tex] → [tex]Ag_{3} PO_{4} ( aq) +3NaNO_{3} (aq)[/tex] is best classified as double displacement reaction.
Those reaction in which two compounds react by exchanges of ions to form two new compounds is called double displacement reaction. The easiest way to identify double displacement reactions is to check to see whether the cations exchanged anions with each other or not . Always balanced chemical equation is used to determine.
There are three types of double displacement reaction which is given as,
Precipitation Neutralization Gas formationThe real world example of double displacement reaction is combining vinegar and baking soda to create homemade volcano.
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The kb of hypochlorous acid is 3. 0×10^–8 at 26. 0 C. What is the percent of ionization of hypochlorous?
The acid dissociation constant (Ka) defines the difference between a weak and a strong acid. The % ionization of hypochlorous acid is 0.14%.
What is the acid dissociation constant?The acid dissociation constant is used to define the ionization constant of an acidic substance. It gives the quantitative measurement of the strength.
The ICE table is attached to the image below.
The acid dissociation constant (Ka) for the reaction is,
Ka = [H⁺][ClO⁻] ÷ [HClO]
= a² ÷ (0.015 - a)
= 3.0 x 10⁻⁸
Now, a² + 3.0 x 10⁻⁸ a - 4.5 × 10⁻¹⁰ = 0
So, a = 2.210 × 10⁻⁵
Solving further,
[H+] = a = 2.210 × 10⁻⁵ M
The percent ionization is calculated as,
[H+] ÷ [HClO] × 100
= 2.210 × 10⁻⁵ M ÷ 0.015 × 100
= 0.14 %
Therefore, 0.14 % is the percentage of hypochlorous ionization.
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Your question is incomplete, but most probably your full question was, The ka of hypochlorous acid (HClO) is 3.0 x 10⁻⁸ at 25.0°C. What is the % of ionization of hypochlorous acid in a 0.015 aqueous solution of HClO at 25.0C?
Which is an acidic functional group that can dissociate and release h into a solution?
The acidic functional group that can dissociate and release h into a solution is -COOH.
Characteristics of a carboxyl group -COOHCarbon atom is bonded to a high electronegative oxygen and a hydroxyl group in the Carboxyl groupExample: Acetic acid CH3COOHThe acidic functional group ( -COOH ) dissociate and releases H atom from the hydroxyl group into a solution as a proton or as a H+ ionHence the Oxygen atom gets a negative chargeThis negative charge moves between both the oxygen atom.From the characteristics of -COOH group we can conclude it as the acidic functional group that can dissociate and release H into a solution.
Disclaimer: The question was incomplete
Which is an acidic functional group that can dissociate and release h into a solution?
A. -OH
B. -COOH
C. -NH2
D. -SH
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In an sn2 reaction between bromomethane and hydroxide ion, the concentration of bromoethane is doubled and the concentration of hydroxide ion doubles the rate of reaction?
The rate of reaction in SN2 reaction becomes four times when the the concentration of bromoethane is doubled and the concentration of hydroxide ion doubles.
In SN2 reaction, the rate of reaction is depend on the concentration of both reactant.
For SN2 reaction,
r = k[bromoethane] [hydroxide ion]
r = k [CH3CH2Br] [OH]
When the concentration of bromoethane is doubled and the concentration of hydroxide ion doubles then,
r = k 2×[CH3CH2Br] × 2[OH]
r = 4k[CH3CH2Br] [OH]
Thus, we concluded that the rate of reaction in SN2 reaction becomes four times.
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can someone help me really quick this is for science
The rules scientists will have to follow to give an element a symbol is by verifying it and naming it with a one-, or two-letter symbol which is usually derived from the name of the element.
What is an Element?This is referred to as substance which can't be broken down into simpler units by any form of chemical means.
When an element is discovered by an individual, it is best for it to be verified before it is named by the discoverer. The possible name for the element Jofrofrinium is Jo which is a two letter symbol or it could be J which is referred to as a one letter symbol.
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3. 2.71x1022 molecules of CO2 to atoms I NEED HELP
2.71 x 10²² molecules of CO2 is equivalent to 2.71 x 10²² atoms.
What is number of molecules?The number of molecules in an element is the combination of atoms in that element.
The number of molecules of an element can be calculated by multiplying the number of moles of that element by Avogadro's number, which is 6.02 × 10²³.
However, the number of molecules in a substance is equivalent to the number of atoms in that substance.
Therefore, 2.71 x 10²² molecules of CO2 is equivalent to 2.71 x 10²² atoms.
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What would happen if N₂ were added to N₂(g) + O₂(g) = 2NO(g) at
equilibrium?
O A. More O2 and NO would form.
OB. More NO would form.
C. More N₂ and O2 would form.
O D. Keq would decrease.
Answer:
B.) More NO would form.
Explanation:
If the amount of N₂ increases, the equilibrium will be out of balance. In order to restore the balance, the reaction will shift to the products side. As such, the amount of NO will increase.
According to Le-chatlier principle, if N₂ is added to the reaction system, then more NO will be produced so as to decrease the amount of N₂.
What is Le-Chatlier principle ?The Le Chatlier's Principle, also known as the Le Chatlier's Law, is a principle in chemistry that states that when a system at equilibrium is subjected to a change in conditions, such as temperature, pressure, or concentration, the system will adjust its equilibrium position to counteract the change and restore equilibrium.
In other words, if a system is disturbed from its equilibrium state, it will try to minimize the effect of the disturbance by shifting the equilibrium position in a direction that partially offsets the disturbance.
If any substance is added to the system, the equilibrium will shift to the direction in which the added substance is consumed. Hence, as N₂ is added to the system, it will consumed to give the product NO.
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What is the ph of a 2. 3 m solution of the weak acid h2s, with a ka of 1. 19×10−7? the equilibrium expression is: h2s(aq) h2o(l)⇋h3o (aq) hs−(aq)
The equilibrium expression is:
H2S (aq) + H2O (l) ⇋ H3O (aq) + HS (aq)
In order to calculate the pH of equation having aqueous solution of weak acid H2S, let’s assume that molar concentration of the products H3O and HS total released is ‘a’. Now as per given information concentration of weak acid H2S is 2.3 M. Thereby,
Ka = [H3O+] [HS] / [H2S]
1.19 x 10-7 = [a] * [a] / [2.3]
a2 = 1.19 x 10-7 x 2.3
a = 5.24 x 10-4
As per the calculation, the total concentration of the products released (HS) and (H3O) will be 5.24 x 10-4, on that basis, the pH of the weak acid (H2S) can be calculated as follows:
-log (0.000522494) = 3.28
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To prevent the system refrigerant from quickly dropping in temperature and pressure, refrigerant recovery should?
To prevent the system refrigerant from quickly dropping in temperature and pressure, refrigerant recovery should Begin with a liquid
In the refrigeration cycle of air conditioners and heat pumps, refrigerants are working fluids that typically go through numerous phase changes from a liquid to a gas and back again.
In the refrigeration cycle, which cools a place, a refrigerant is a material, frequently a fluid. Refrigerants use the thermodynamic phenomenon of phase transitions, in which a fluid transforms into a gas or vice versa, to absorb heat and then release it to another area.
At room temperature, it is often a gas. Ammonia, sulfur dioxide, and non-halogenated hydrocarbons like propane are further typical refrigerants that are employed in a variety of applications.
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