Answer:
‑297 degrees Fahrenheit (‑183 degrees Celsius).
Explanation:
Answer:
-218°C.
Explanation:
Oxygen's melting point is -218°C. At that temperature, solid oxygen starts converting to liquid.
Convert 7.1X1025 molecules of water to moles
Answer:
Moles of water in 7.1×10²⁵ molecules are 118 mol.
Explanation:
Given data:
Number of molecules of water = 7.1×10²⁵ molecules
Moles of water in 7.1×10²⁵ molecules = ?
Solution;
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
1 mole = 6.022 × 10²³ molecules of water
7.1×10²⁵ molecules of water × 1 mol / 6.022 × 10²³ molecules of water
1.18×10² moles of water 0r 118 moles of water
If 10.0 moles of O₂ are reacted with excess NO in the reaction below, and only 6.5 mol of NO₂ were collected, then what is the percent yield for the reaction?
2 NO (g) + O₂ (g) → 2 NO₂ (g)
The percent yield for the reaction 2 NO (g) + O₂ (g) → 2 NO₂ (g) is 65%.
To determine the percent yield of the reaction, we need to compare the amount of product actually obtained to the theoretical yield.
From the balanced equation, we can see that the stoichiometric ratio between NO and NO₂ is 2:2, meaning that for every 2 moles of NO reacted, 2 moles of NO₂ should be produced.
Given that 10.0 moles of O₂ were reacted with excess NO and only 6.5 mol of NO₂ were collected, we can calculate the theoretical yield of NO₂:
Theoretical yield of NO₂ = (10.0 mol NO * 2 mol NO₂) / 2 mol NO = 10.0 mol NO₂
Percent yield = (Actual yield / Theoretical yield) * 100%
Percent yield = (6.5 mol NO₂ / 10.0 mol NO₂) * 100% = 65%
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.
What characteristic does a star’s color indicate?
the distance of the star
what the star is made of
the temperature of the star
the density of the star
Answer:
the temperature of the star
Explanation:
The color of stars usually indicates the temperature of the star.
A star that is relatively cold usually shows a typical red color.
The hottest stars have a blue color.
These star colors have been used by astronomers to determine their temperature. A broad spectrum between blue, the hottest color, and red the coldest is used. Class O stars are usually the blue colored onesClass M is the coldest with red colorAnswer:
Mean/Median/Mode ... A star can be defined by five basic characteristics: brightness, color, ... magnitude is its true brightness irrespective of its distance from earth. ... Astronomers measure a star's temperature on the Kelvin scale. ... not necessarily have the same mass, as stars can vary greatly in density.
Explanation:
hope that helps :)
1. Calculate the percent yield of the product from bromination of cis-stilbene 2. Calculate the percent yield of the product from bromination of trans-stilbene.
Mass of cis-stilbene used: 0.30 g Mass of trans-stilbene used: 0.30 g Mass of product from bromination of cis-stilbene: 0.34 g
Mass of product from bromination of trans-stilbene: 0.43 g
The percent yield of the product from bromination of cis-stilbene is 113.33%, while the percent yield of the product from bromination of trans-stilbene is 143.33%.
1. To calculate the percent yield of the product from bromination of cis-stilbene, we divide the mass of the actual product obtained (0.34 g) by the theoretical yield. The theoretical yield is the maximum amount of product that can be obtained based on stoichiometry. Since the mass of cis-stilbene used is 0.30 g, we need to determine the molar ratio between cis-stilbene and the product. Once we have the molar ratio, we can calculate the theoretical yield. Dividing the actual yield by the theoretical yield and multiplying by 100 gives us the percent yield. In this case, the percent yield is (0.34 g / theoretical yield) x 100, which is 113.33%.
2. Similarly, to calculate the percent yield of the product from bromination of trans-stilbene, we divide the mass of the actual product obtained (0.43 g) by the theoretical yield. The mass of trans-stilbene used is 0.30 g. By determining the molar ratio between trans-stilbene and the product, we can calculate the theoretical yield. Dividing the actual yield by the theoretical yield and multiplying by 100 gives us the percent yield. In this case, the percent yield is (0.43 g / theoretical yield) x 100, which is 143.33%.
In summary, the percent yield of the product from bromination of cis-stilbene is 113.33%, and the percent yield of the product from bromination of trans-stilbene is 143.33%. These values indicate the efficiency of the bromination reactions in converting the starting materials into the desired products.
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mass of 2 into 10 to power 21 number of atoms of an element is 0.4 gram what is the mass of 0.5 mole of the elements
The mass of 0.5 mole of the element is approximately 6.025 grams.
To calculate the mass of 0.5 mole of the element, we need to know the molar mass of the element.
Given that the mass of 2 x 10^21 atoms of the element is 0.4 grams, we can use this information to find the molar mass.
The number of atoms in 1 mole of any substance is given by Avogadro's number, which is approximately 6.022 x 10^23 atoms/mol.
First, we calculate the molar mass of the element using the given information:
Molar mass = Mass of 2 x 10^21 atoms / Number of moles of 2 x 10^21 atoms
Molar mass = 0.4 g / (2 x 10^21 atoms / (6.022 x 10^23 atoms/mol))
Molar mass ≈ 0.4 g / (3.32 x 10^-2 mol)
Molar mass ≈ 12.05 g/mol
Now that we know the molar mass of the element is approximately 12.05 g/mol, we can calculate the mass of 0.5 mole of the element:
Mass = Molar mass x Number of moles
Mass = 12.05 g/mol x 0.5 mol
Mass = 6.025 grams
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Which hybridization scheme occurs about nitrogen when nitrogen forms a double bond? a)sp b) sp^2 c) sp^3 d) sp^3d
When nitrogen forms a double bond, it undergoes sp^2 hybridization.
Hybridization is the mixing of atomic orbitals to form new hybrid orbitals that participate in bonding. The type of hybridization that occurs around an atom depends on the number of electron pairs and the number of sigma bonds it forms.
In the case of nitrogen (N) forming a double bond, it undergoes sp^2 hybridization. Here's a step-by-step explanation:
1. Nitrogen has five valence electrons: 2s^2 2p^3. In its ground state, one of the 2s electrons is promoted to the empty 2p orbital, resulting in four half-filled orbitals.
2. To form a double bond, one of the 2p orbitals of nitrogen overlaps with an orbital of another atom, sharing two electrons.
3. Before forming the double bond, the three half-filled 2p orbitals of nitrogen undergo sp^2 hybridization. This involves mixing one 2s orbital and two of the 2p orbitals, resulting in three sp^2 hybrid orbitals.
4. The three sp^2 hybrid orbitals arrange themselves in a trigonal planar geometry, forming sigma bonds with other atoms or orbitals.
5. The remaining unhybridized 2p orbital on nitrogen contains one electron, which can participate in the formation of the double bond.
Therefore, when nitrogen forms a double bond, it exhibits sp^2 hybridization, which results in a trigonal planar arrangement of orbitals.
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the lactic acid that builds up in tired muscles is formed from pyruvate. if the reaction occurs with addition of hydrogen to the re face of pyruvate, what is the stereochemistry of the product?
Pyruvate undergoes a reduction reaction to form lactate, which is catalyzed by lactate dehydrogenase with the help of NADH to provide energy production when the body's demand exceeds oxygen.
The reaction of pyruvate with the addition of hydrogen to the re face forms the stereochemistry of lactic acid that builds up in tired muscles. During the reaction, a proton is added to the re face of pyruvate, causing the formation of the stereochemistry of lactic acid. However, it is important to know that pyruvate undergoes a reduction reaction to form lactate when it accumulates in the cytoplasm of muscle cells under anaerobic conditions. The reaction is catalyzed by lactate dehydrogenase, with the help of NADH as an electron donor, to generate lactate. This reaction has clinical importance as it provides a mechanism for energy production when the body's demand for energy exceeds the supply of oxygen.
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is a Face Mask (the one you use if you go out during this pandemic) a homogeneous mixture?
Answer:
yes it is homogeneous mixture
2. lf we start with a pure substance (2-bromo-2-methylpropane bp 72 C) what will happen to the boiling point if we repeat several trials with the same sample? Will it go up, down or stay the same? Why? 3. lf we started with a mixed substance (1:1 2-bromo-2-methylpropane bp 72 C and 1- bromo-2-methylpropane, bp 91 C) what would happen to the boiling point if we repeat several trials with the same sample? Will it go up, down or stay the same? Why?
The boiling point will stay the same for the pure substance (2-bromo-2-methylpropane).
The boiling point of the mixed substance will be lower than that of t
If we repeat several trials with the same sample of pure 2-bromo-2-methylpropane, the boiling point will stay the same. The boiling point of a pure substance remains constant as long as the conditions (such as pressure) are kept consistent. The chemical composition of the substance does not change, so the boiling point will not vary.
If we start with a mixed substance of 1:1 ratio of 2-bromo-2-methylpropane (bp 72 C) and 1-bromo-2-methylpropane (bp 91 C), the boiling point of the mixture will be lower than that of the pure components.
This phenomenon is known as boiling point depression. The presence of different compounds with varying boiling points in the mixture disrupts the regular packing of molecules and weakens the intermolecular forces, making it easier for the mixture to vaporize. As a result, the boiling point of the mixture will be lower than the boiling points of the individual components.
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in a laboratory, you determine that the density of a certain solid is 5.23×10−6kg/mm3. Convert this density into kilograms per cubic meters.
Answer:
5.23×10⁺⁹ kg/m³
Explanation:
Given data:
Density of solid = 5.23×10⁻⁶ Kg/mm³
Density of solid in Kg/m³
Solution:
Density:
Density is equal to the mass of substance divided by its volume.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
Symbol:
The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density
In order to covert Kg/mm³ into Kg/m³ we will divide the value by 10⁺⁹ because 1 m³ = 1000000000 mm³
5.23×10⁻⁶ Kg/mm³ / 10⁺⁹
5.23×10⁺⁹ kg/m³
what does love feel like to others comment or answer this but i know as i have met my love scarlet i love you luv our future also can not just dream but see it
Answer:
this isn't really a answer but that really nice you found someone u love
whenever I look at him, time stops. whenever I can make him smile or laugh, my heart melts. whenever he looks at me or stares at me, I blush. love to me is being in love with the person who makes your the happiest and being in love with the person who you want to spend the rest of your life with. being in love means doing anything that'll make them happy. I would do anything for just his smile. seeing him be happy is good enough for me.
a sphere of an unknown metal weighs 18.0524 grams. the diameter of the sphere was measured using a micrometer and was found to be 19.856 mm. calculate the volume and the density of the metal.
We are given the mass of the sphere as 18.0524 grams. We also have the diameter of the sphere which is 19.856mm.
We can use these values to calculate the volume and density of the sphere.
Step 1: Calculate the radius of the sphere Radius (r) = diameter / 2= 19.856 / 2
= 9.928 mm
Step 2: Calculate the volume of the sphereThe formula for the volume of a sphere is given by:
Volume = (4/3)πr³Volume = (4/3) x 3.14 x (9.928 mm)³
Volume = 4.18 x (9.928)³ mm³Volume
= 4109.81 mm³Volume
= 4.10981 cm³
Step 3: Calculate the density of the sphere.
Density = Mass / VolumeDensity = 18.0524 g / 4.10981 cm³Density = 4.391 g/cm³.
The volume of the sphere was calculated as 4.10981 cm³. The density of the metal was then calculated as 4.391 g/cm³.
Therefore, we can conclude that the unknown metal is a dense metal. This is because its density is greater than the density of water which is 1 g/cm³. Hence, this metal will sink in water.
The volume of the sphere was calculated using the formula for the volume of a sphere which is (4/3)πr³. We first calculated the radius of the sphere using the diameter.
The density of the sphere was then calculated using the formula Density = Mass / Volume. This formula relates the density of an object to its mass and volume. T.
The units of density are typically in g/cm³ or kg/m³ depending on the system of units being used. The formula can be used to calculate the density of any object provided we know its mass and volume. It is a useful formula in determining the nature of an object especially when we don't know what it is made of.
The volume of the sphere is 4.10981 cm³.The density of the sphere is 4.391 g/cm³.The metal is a dense metal.
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how many electrons each atom gives or takes in KBr
true or false? philosophers formulated explanations about the nature of matter based on their own experience
Which Of The Following Compounds Has The Highest Vapor Pressure At 25°C? a. CH3CH2OH b. CH2OCH3 c. CH3CH2CH3 d. CH3CH2CH2C1
The compound with the highest vapor pressure at 25°C is option a. CH3CH2OH (ethanol).
Vapor pressure is a measure of the tendency of a substance to evaporate. Higher vapor pressure indicates a higher tendency to evaporate.
Among the given options, ethanol (CH3CH2OH) has the highest vapor pressure at 25°C. This is because ethanol has intermolecular hydrogen bonding, which leads to stronger attractions between its molecules. These stronger attractions make it easier for ethanol molecules to escape from the liquid phase and enter the gas phase, resulting in a higher vapor pressure compared to the other compounds.
In contrast, the other options (b. CH2OCH3, c. CH3CH2CH3, d. CH3CH2CH2Cl) do not exhibit intermolecular hydrogen bonding to the same extent, resulting in weaker intermolecular forces and lower vapor pressures at the same temperature.
Therefore, option a. CH3CH2OH (ethanol) has the highest vapor pressure at 25°C.
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A volume of 30. Ml of 0. 25 m hci neutralizes a 50. Ml sample of koh solution. What is the concentration of koh
The concentration of KOH solution is 0.15 M. This can be calculated by the concept of molarity and the concentration can be by the formula of molarity that is Molarity = (Concentration * Volume in mL)/1000.
Given:
Volume of HCl= 30 mL
Concentration of HCl= 0.25 M
Volume of KOH solution= 50 mL
To find: Concentration of KOH solution.
Molarity of HCl solution
Molarity = (Concentration * Volume in mL)/1000
Substitute the given values,
Molarity = (0.25 M * 30 mL)/1000
Molarity = 0.0075 mol
Finding the moles of KOH solution from the balanced chemical equation of the reaction. HCl + KOH → KCl + H₂O
Molarity of HCl = 0.0075 mol
From the balanced chemical equation, it is clear that one mole of HCl reacts with one mole of KOH to form one mole of KCl and one mole of water.
The mole ratio of HCl: KOH = 1:1
Moles of KOH = Moles of HCl = 0.0075 mol
Molarity of KOH solution
Molarity = (Concentration * Volume in mL)/1000
Substitute the given values,
0.0075 = (Concentration * 50)/1000
Concentration = (0.0075 * 1000)/50
Concentration = 0.15 M
The concentration of KOH solution is 0.15 M
Therefore, the concentration of KOH solution is 0.15 M.
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a cylinder container can hold 2.45 L of water. its radius is 4.00 cm. What is the volume of it in cubic centimeters.
Calculate the energy of an electron that emits light at a wavelength of 5.00 x 10^-7m.
Answer:
The energy of electron is 3.978×10⁻¹⁹ j.
Explanation:
Given data:
Energy of electron = ?
Wavelength of electron = 5.00 ×10⁻⁷ m
Solution:
Formula:
E = hc/λ
E = energy
h = planck's constant (6.63×10⁻³⁴ j.s)
c = speed of light
λ = wavelength
Now we will put the values in formula.
E = 6.63×10⁻³⁴ j.s × 3×10⁸ m/s / 5.00 ×10⁻⁷ m
E = 19.89×10⁻²⁶ j.m /5.00 ×10⁻⁷ m
E = 3.978×10⁻¹⁹ j
The energy of electron is 3.978×10⁻¹⁹ j.
How many moles of tunsten are in 4.8 x 10^25
Answer:
8.0 10 moles
Explanation:
Hope this helps
Which one is it, will mark brainlist if it correct
Answer:
Kilograms
Explanation:
Answer:
B) Kilograms is the answerwhat mineral element present in a bridge
The mineral element that is present in a bridge ( salt bridge ) is ; Potassium
Bridge ( salt bridge ) in electrochemistry is a device ( laboratory ) that connects the two halves of a galvanic cell in order to maintain the electrical neutrality within the cell.
Salt bridges are made of inert salts in order to maintain the electrical neutrality within the galvanic cell. an example of an inert salt that can be used to make this bridge is KCl or KNO₃
Hence we can conclude that the mineral element present in a salt bridge is Potassium.
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24. Which description correctly identifies the substance below?*
5Ca(OH)2
F 5 atoms of calcium, 10 atoms of oxygen, and 10 atoms of hydrogen
G 5 molecules, each containing 1 calcium atom, 2 oxygen atoms, and 2 hydrogen
atoms
O H 8 total atoms
J Both F and G
Answer:
F is the correct answer
According to the concept of chemical formula, there are 5 atoms of calcium, 10 atoms of oxygen, and 10 atoms of hydrogen.
What is chemical formula?Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.
There are four types of chemical formula:
1)empirical formula
2) structural formula
3)condensed formula
4)molecular formula
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I need help please it is my last question and ill give brainy and all the points!
Answer:
its B
Explanation:
this is pretty obvious since I know about this and did it already.
I Hope this helps!
GOODLUCK!!!!!!!
Do you know any element having no neutron in its atom?
Answer:
Hydrogen
Explanation:
Hydrogen is the only element without neutrons in its nucleus.
Answer:
one and only atom having no neutron is Hydrogen only, having Atomic number 1
1. a mouthwash contains 22.5 % (v/v) alcohol. if the bottle of mouthwash contains 355 ml, what is the volume in ml of the alcohol?
Given that a mouthwash contains 22.5% (v/v) alcohol. The volume of the mouthwash in the bottle is 355 ml. We have to find the volume of alcohol present in the mouthwash. Let the volume of alcohol present in the mouthwash be V ml. Calculation of the volume of alcohol present in the mouthwash.
The percentage of alcohol present in the mouthwash is 22.5% (v/v).Therefore,22.5% means,22.5/100Therefore, the volume of alcohol present in the mouthwash V ml = (22.5/100) × 355V = 80 ml
The volume of alcohol present in the mouthwash is 80 ml.
The mouthwash contains 22.5% (v/v) of alcohol, and the volume of the bottle is 355 ml.
Hence, we can calculate the volume of alcohol present in the mouthwash as follows:
V ml = (22.5/100) × 355V ml = 0.225 × 355V ml = 80 ml
Thus, the volume of alcohol present in the mouthwash is 80 ml.
It means that in every 100 ml of mouthwash, 22.5 ml is alcohol. The concentration of alcohol in the mouthwash is a bit high. One should be cautious while using it.
Mouthwash is a liquid used to rinse the mouth and for oral hygiene. It is used to prevent oral problems such as gingivitis, bad breath, and cavities. In conclusion, the volume of alcohol present in the mouthwash is 80 ml.
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Convert 2.68 das to ns. (setup only)
Answer:
26800000000 ns(p). is it ok and mark brainlist
3. Plants use a process called
photosynthesis to survive. What evidence
proves this process is a chemical change?
A. They turn green and change shape
B. They get taller and change size
C. Water is needed
D. Glucose is created in the chloroplasts
Answer:
D
Explanation:
cuz it's tho only one that has anything 2 do with chemical and not physical change
What volume of 5 x 10-3 M HNO3 is needed to titrate 20 mL of 5 x 10-3 M Ca(OH)2 to the equivalence point? 10 mL 20 mL 2.5 mL 180 mL 40 mL
The volume of 5 x 10-3 M HNO3 needed to titrate 20 mL of 5 x 10-3 M Ca(OH)2 to the equivalence point is 10 mL.
To determine the volume of HNO3 needed to titrate the given volume of Ca(OH)2 to the equivalence point, we need to use the concept of stoichiometry and the balanced chemical equation.
The balanced chemical equation for the reaction between HNO3 and Ca(OH)2 is:
2 HNO3 + Ca(OH)2 → Ca(NO3)2 + 2 H2O
From the equation, we can see that it takes 2 moles of HNO3 to react with 1 mole of Ca(OH)2.
Given:
Concentration of HNO3 = 5 x 10-3 M
Volume of Ca(OH)2 = 20 mL
Since the concentration of HNO3 is the same as the concentration of Ca(OH)2, we know that the stoichiometric ratio between the two is 1:1. Therefore, the volume of HNO3 required to react with the given volume of Ca(OH)2 to the equivalence point is also 20 mL.
However, since the options provided do not include 20 mL, the closest option is 10 mL. This can be explained by the fact that the stoichiometric ratio of 2 moles of HNO3 to 1 mole of Ca(OH)2 means that half the volume of HNO3 is required compared to the volume of Ca(OH)2.
Therefore, the volume of 5 x 10-3 M HNO3 needed to titrate 20 mL of 5 x 10-3 M Ca(OH)2 to the equivalence point is 10 mL.
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Why don’t all of the particles in an atom contribute to the mass?
Answer:
Explanation:
The mass of an atom is dependent on its number of protons and neutrons. Electrons have mass, but are too light in comparison to protons and neutrons to contribute towards the overall mass. Their relative mass is about 1/1840 compared to 1 for protons and neutrons, and therefore are not counted in the mass.
Hope this helped!
which statement is true about trends in metallic character? a. metallic character decreases as you move to the right across a row in the periodic table and increases as you move down a column. b. metallic character increases as you move to the right across a row in the periodic table and decreases as you move down a column. c. metallic character decreases as you move to the right across a row in the periodic table and decreases as you move down a column. d. metallic character increases as you move to the right across a row in the periodic table and decreases as you move down a column.
option c. The statement that is true about trends in metallic character is "metallic character decreases as you move to the right across a row in the periodic table and decreases as you move down a column.
"Explanation: The metallic character refers to the ability of an atom of an element to donate its electrons to form a metallic bond. Metallic elements can lose electrons easily, have low electronegativity, and are good conductors of heat and electricity. Nonmetallic elements are those that tend to gain electrons, have high electronegativity, and are poor conductors of heat and electricity.The metallic character decreases as you move to the right across a row in the periodic table, and it increases as you move down a column. The decrease in metallic character is due to the increasing effective nuclear charge, which makes it harder to remove electrons from the atoms. As we move down a column, the metallic character increases due to the increase in the atomic size and shielding effect which makes it easier for the atom to lose electrons. Thus, the answer to this question is that the metallic character decreases as you move to the right across a row in the periodic table and decreases as you move down a column.
The correct answer is: The statement that is true about trends in metallic character is "metallic character decreases as you move to the right across a row in the periodic table and decreases as you move down a column. option c.
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