Answer:
The initial volume of Ne gas is 261mL
Explanation:
This question can be answered using Ideal Gas Equation;
However, the following are the given parameters
Initial Pressure = 654mmHg
Finial Pressure = 345mmHg
Final Volume = 495mL
Required
Initial Volume?
The question says that Temperature is constant;
This implies that, we'll make use of Boyle's law ideal gas equation which states;
[tex]P_1V_1 = P_2V_2[/tex]
Where [tex]P_1[/tex] represent the initial pressure
[tex]P_2[/tex] represent the final pressure
[tex]T_1[/tex] represent the initial temperature
[tex]T_2[/tex] represent the final temperature
[tex]P_1 = 654mmHg\\P_2 = 345mmHg\\V_2 = 495mL[/tex]
Substitute these values in the formula above;
[tex]654 * V_1 = 345 * 495[/tex]
[tex]654V_1 = 170775[/tex]
Divide both sides by 654
[tex]\frac{654V_1}{654} = \frac{170775}{654}[/tex]
[tex]V_1 = \frac{170775}{654}[/tex]
[tex]V_1 = 261.123853211[/tex]
[tex]V_1 = 261mL[/tex] (Approximated)
The initial volume of Ne gas is 261mL
Given the following equation: 2 KCIO, 2 KCI + 3 Oz, how many grams of Oz can
be produced by letting 8.00 moles of KCIO, react?
Answer : The mass of [tex]O_2[/tex] produced is, 384 grams.
Explanation : Given,
Moles of [tex]KClO_3[/tex] = 8.00 mol
First we have to calculate the moles of [tex]O_2[/tex]
The balanced chemical equation is:
[tex]2KClO_3\rightarrow 2KCl+3O_2[/tex]
From the reaction, we conclude that
As, 2 moles of [tex]KClO_3[/tex] react to give 3 moles of [tex]O_2[/tex]
So, 8.00 mole of [tex]KClO_3[/tex] react to give [tex]\frac{3}{2}\times 8.00=12[/tex] mole of [tex]O_2[/tex]
Now we have to calculate the mass of [tex]O_2[/tex]
[tex]\text{ Mass of }O_2=\text{ Moles of }O_2\times \text{ Molar mass of }O_2[/tex]
Molar mass of [tex]O_2[/tex] = 32 g/mole
[tex]\text{ Mass of }O_2=(12moles)\times (32g/mole)=384g[/tex]
Therefore, the mass of [tex]O_2[/tex] produced is, 384 grams.
The table lists the lattice energies of some compounds.
Compound
Lattice Energy (kJ/mol)
LiF –1,036
LiCl –853
NaF –923
KF –821
NaCl –786
Which statement about crystal lattice energy is best supported by the information in the table?
The lattice energy increases as cations get smaller, as shown by LiF and KF.
The lattice energy increases as the cations get larger, as shown by LiF and LiCl.
The lattice energy decreases as cations get smaller, as shown by NaCl and NaF.
The lattice energy decreases as the cations get smaller, as shown by NaF and KF.
Answer:
The lattice energy increases as cations get smaller, as shown by LiF and KF.
Explanation:
Lattice energy is the change in internal energy that accompanies the formation of one mole of the solid from its constituent gas phase ions at 0 K. In calculating the lattice energy, we assume an electrostatic model where the ions are regarded as point charges.
The size of the ions determines the magnitude of the lattice energy. If the anion is the same, then the magnitude of the lattice energy depends on the the size of the cation, the smaller the cation the greater the lattice energy.
Since Li^+ is smaller than K^+, it is expected that LiF will have a greater lattice energy than KF, hence the answer.
The statement about crystal lattice energy that is supported by the information in the table is A. The lattice energy increases as cations get smaller, as shown by LiF and KF.
It should be noted that lattice energy simply means the change in internal energy that occurs after the formation of one mole of the solid from its constituent gas phase ions.
The magnitude of the lattice energy is determined by the size of the ions. From the table, the lattice energy increases as cations get smaller, as shown by LiF and KF.
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the sun is 73% hydrogen and 25% helium the rest is other elements what is the percentage of other elements in the sun
Answer:
12%
Explanation:
The table shows the atomic number of four atoms.
Which one is NOT a metal?
Answer:
A. Argon
Explanation:
Argon is a nonmetal. It is a noble gas with an atomic number of 18.
Based on the periodic table of chemical elements, the atom which is not a metal is the atom with an atomic number (number of protons) of 18.
Given the following data:
Number of protons = 18Number of protons = 19Number of protons = 19Number of protons = 20An chemical element can be defined as a pure substance which is made up of atoms that are having the same atomic number (number of protons) in its atomic nucleus.
This ultimately implies that, an atomic number is equal to the number of protons in the nucleus of an atom of a chemical element.
In Chemistry, the following chemical elements have this atomic number:
Argon = 18 = 2:8:8Potassium = 19 = 2:8:8:1Calcium = 20 = 2:8:8:2Note: Both group 1 and 2 chemical elements are metals.
However, an atom with an atomic number of 18 is in group 8 of the periodic table and as such isn't a metal but a noble gas.
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Consider the combustion of butane: 2C4H10(g) + 1302(g) ===> 8CO2(g) + 10H2O(1)
If you want to produce 120 moles of carbon dioxide (CO2), who many moles of butane would you need
to react?
A. none are correct
B. 195 moles
C. 150 moles
D. 30 moles
E. 480 moles
You are conducting an
experiment on how increasing
pressure during a deep sea div
affects gases in the blood. Whi
unit would be appropriate for
your measurements?
A. Pascals
B. Centimeters cubed
C. Liters
D. Kelvin
Reset Selection
Answer:
A. Pascals
Explanation:
A unit Pascal is an SI unit used for internal pressure.
Centimeters cubed is volume.
Liters is measurement.
Kelvin is temperature.
Answer: A. Pascals
Explanation: Founders Educere answer
One atomic model describes electrons moving in clouds around the nucleus.
How does this model fit into the history of atomic theory?
A. It was the first atomic model.
O B. It has been changed to show that electrons are scattered
throughout the nucleus.
O c. It has been changed to show that electrons travel in circular orbits
around the nucleus.
OD. It is the currently accepted atomic model.
Answer: D. It is the currently accepted atomic model.
Explanation:
It is the mordern atomic model, also known as the Electron Cloud Model. Indicating that the nucleus of an atom is surrounded by a cloud of electrons.
Answer:
Explanation:
d
The images below shows an electron orbital diagram for a
specific element. What is the element? (Hint: count the
number of arrows-- what do they represent?)
Answer:
Nitrogen
Explanation:
Each arrow counts as one electron so in total you have 7 arrows = 7 electron. From periodic table, we know Nitrogen has 7 electrons so the element here is nitrogen.
Answer:
Nitrogen
Explanation:
1 arrow is 1 electron. In total you have 7 arrows which means you have 7 electron. Nitrogen has 7 electrons.
Which one has a greatest mass, one atom of carbon, one atom of hydrogen, or one atom of litium
Scientific evidence shows that Earth's diameter, and thus overall size, does
not change. This evidence goes against which two theories?
A. Expanding Earth
B. Plate tectonics
O c. Contracting Earth
D. Continental drift
U
SUBMIT
Answer:
The evidence goes against A. Expanding Earth and B. Contracting Earth
In order from left to right, what are the coefficients (front numbers) needed to
balance the following equation? H2O2(aq) → H2O(1) + O2(g)*
Answer:
2H2O2 → 2H2O + O2
Explanation:
Florine is the most electronegative element on the periodic table. Explain why the element fluorine will not give up electrons when forming a chemical bond.
Answer:
Fluorine will not give up electrons when forming a chemical bond because since it is so electronegative, it pulls electrons from other elements closer to it. Fluorine also has seven valence electrons and needs just one electron to fill its outer shell and gain stability.
Hope this helps. :)
The information regarding the element fluorine is explained below:
The following information should be considered:
Fluorine should not give up electrons at the time when forming a chemical bond since it is so electronegative, it pulls electrons from other elements nearer to it. Fluorine also contains seven valence electrons and required just one electron to fill its outer shell and gain stability.Learn more:https://brainly.com/question/17429689?referrer=searchResults
3.0 x 10 23 molecules of element Z have a mass of 38 g. What is the mass of 1 mole?
50 Points for whoever does it and shows their work. Maya has four glasses of milk. The temperature and the amount of milk in each glass are shown: Glass A: 20 grams of milk at 10 °C Glass B: 50 grams of milk at 80 °C Glass C: 20 grams of milk at 50 °C Glass D: 50 grams of milk at 80 °C Which statement is correct?
Answer:
A. 20 grams of milk at 10°C
Explanation:
Since we refrigerate milk, it would be cooler than the room temperature, which standard norm is 25°C. So the milk has to be colder than the room temperature. Therefore, our answer is A.
Answer: A is the correct answer
Explanation:
The temperature of room temperature is more than that and you need to keep it colder, hope this helped!
The correct name for molecule I is
Molecule I
I
|
CH3-CH-CH3
a. Iodopropane
b. 2-iodylpropane
c. 2-iodopropane
D. Propyliodine
14. The correct name for molecule III is
Molecule III
F
|
C= CH
——-
a. 2-Fluoroeth 1-yne
b. Fluoroethyne
C. Fluoroethene
D. Methylfluorine
16. Synthetic chlorinated hydrocarbons such as dioxins and furans are usually greater pollution hazard then natural organic substances because synthetic hydrocarbons are
a. More volatile
b. Less water soluble
C. Less Biodegradable
D. More chemically reactive
Question 17.
Sources of pollutants
1. High temperature combustion
2. Pulp and paper industry
3. Pesticides
4. Sour gas plants
Match each source of pollutant as numbered above with its pollutant as listed below. Use each number only once
17. Dioxins/furans
18. SO2(g)
19. Nox(g)
20. Phosphates
Answer:
c). 2-iodopropane
14) C). Fluoroethene
16) D). More chemically reactive
17) 1). High temperature combustion - Dioxins/furans
2). Pulp and paper industry - SO2(g)
3). Pesticides - Phosphates
4). Sour gas plants - Nox(g)
Explanation:
The correct name for molecule I would be '2-iodopropane' where the number 2 reflects the position of iodine. There are three carbons and 8 hydrogen atoms which reflect that it is an alkane compound. In the given carbon chain. In this chain of three carbons, iodine is present on the second carbon. Therefore, option C is the correct answer.
14). The appropriate name for molecule III exemplifies Fluoroethene as it consists of two carbons due to which it belongs to the 'ethane' group and it bears the prefix 'fluoro as it belongs to fluorine group and the suffix '-ene' due to double bond.
16). Synthetic hydrocarbons are 'more chemically reactive' and therefore, it generates greenhouse gases and leads to climate change, global warming, depletion of the ozone layer, etc.
17). 1). Dioxins are generated as a result of high-temperature combustion processes like commercial waste incineration or burning of fuels.
2). Pulp and paper industry releases various gases like nitrogen oxide, sulfur dioxide SO2(g), carbon dioxide, etc.
3). Phosphate is the pollutant released from pesticides that badly affects the fertility of the soil.
4). Nox(g) nitrogen oxide released by sour gas plants and coal-fired emissions is a major contributor to increased greenhouses gases and global warming.
For each of the esters provided, identify the alcohol and the carboxylic acid that reacted.
52. Methyl propanoate+_________
53. Ethyl methanoate+__________
Answer:
52. The alcohol USED => methanol, CH3OH
The carboxylic acid USED => propanoic acid, CH3CH2COOH.
53. The alcohol USED => Ethanol, CH2CH3OH
The carboxylic acid USED => Formic acid, HCOOH.
Explanation:
52. To obtain Methyl propanoate, CH3CH2COOCH3, we simply react propanoic, CH3CH2COOH and methanol, CH3OH together as shown below:
CH3CH2COOH + CH3OH —> CH3CH2COOCH3 + H2O
The alcohol used: methanol, CH3OH
The carboxylic acid used: propanoic acid, CH3CH2COOH.
53. To obtain Ethyl methanoate, HCOOCH2CH3, we simply react
Formic acid, HCOOH and ethanol, CH3CH2OH together as show below:
HCOOH + CH3CH2OH —> HCOOCH2CH3 + H2O
The alcohol USED => Ethanol, CH2CH3OH
The carboxylic acid USED => Formic acid, HCOOH.
A group in the periodic table has the same
A. number of protons.
B. number of neutrons.
C. number of outer shell electrons.
D. shell number.
Hey there! :)
Answer:
C. Number of outer shell electrons.
Explanation:
Groups consist of the vertical columns of the periodic table, such as 1A, 2A, etc. (Not including transition metal groups) which depict the number of valence electrons, or the number of electrons in the atom's outer shell.
For example, Oxygen, which is in group 6A, contains 6 valence (outer shell) electrons.
Answer:
number of outer shell electrons.
Explanation:
hi :) why must litmus paper be moistened to test for ammonia ?
Answer:
Ammonia is gas.
Explanation:
If not moistened, there will be no change in color of litmus paper. That is why littmus paper is being moistened before testing the pH of a gas.
Hope it helps.
Calculate the number of moles in each of the following:
a. 82.0 g of Ag
b. 0.288 g of C
c. 15.0 g of ammonia, NH3 d. 7.25 g of CH4
e. 245 g of Fe2O3

Answer:The mole, symbol mol, is the SI base unit of amount of substance. The quantity amount of substance is a measure of how many elem
Explanation:
Sugar can be converted to carbon dioxide and water by burning in air or by metabolic reactions inside living cells. How are these reactions similar and how are they different?
Answer:
These reactions are similar because the process is similar and the products are carbon dioxide they are different because the substances are different to outgo these reactions
Explanation:
In the reaction Ca + Cl2 → CaCl2, what is the mole ratio of chlorine to calcium chloride?
Select one:
O a. 2:3
O b. 2:1
O c. 1:2
O d. 1:1
PLEASE HELP ME
Answer:
D. 1:1
Explanation:
For every 1 mole of chlorine (Cl₂), there is one mole of calcium chloride (CaCl₂).
So, the mole ratio of chlorine to calcium chloride is 1:1.
Hope this helps. :)
The mole ratio of chlorine to calcium chloride in the given chemical reaction is 1:1.
What is the stoichiometry?Stoichiometry of the reaction gives idea about the relative amount of moles of reactants and products present in the given chemical reaction.
Given chemical reaction is:
Ca + Cl₂ → CaCl₂
From the stoichiometry of the given reaction it is clear that,
1 mole of chlorine = reacts with 1 mole of calcium chloride
So, mole ratio = Chlorine / calcium chloride = 1:1
Hence required mole ratio is 1:1.
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Bromine water was added dropwise to test tubes containing aqueous solutions of bromide, chloride, and iodide. lodide was oxidized to iodine; bromide and chloride gave no reaction Arrange Br 2 ,Cl 2 ,I 2 in order of their strength as an oxidizing agent.
Answer:
Cl₂ > Br₂ > I₂
Explanation:
An oxidizing agent gains electron for itself by removing electrons from other reactants during a reaction. Oxidation is the loss of electrons. Chlorine can take electron from bromine and chlorine while bromine can take electron from iodine, therefore chlorine is a more oxidizing agent than bromine and iodine while bromine is a more oxidizing agent than iodine.
Oxidizing ability decreases down the group.
Therefore Cl₂ > Br₂ > I₂
Which factor will increase a population's size?
Answer:
The two factors that increase the size of a population are natality, which is the number of individuals that are added to the population over a period of time due to reproduction, and immigration, which is the migration of an individual into a place.
2. Density is a physical property of a molecule that's measured as mass per unit volume.
(a) Given that density is usually expressed in the units of g/cm', calculate the density of a cube of plastic
that has a mass of 2.331 g and an edge length of 1.500 cm (volume of a cube is V = 1).
I
(b) Draw two liquids in a graduated cylinder on a separate sheet of paper. You won't submit the drawing as
part of your answer. Liquid A has a density of 1.004 g/cm and Liquid B has a density of 0.6223 g/cm”.
Assume they don't mix. Label which liquid is on top and which liquid is on bottom, and then draw the cube
where you would expect it to be if it's dropped into the graduated cylinder with these two liquids.
Explain the location for liquid A, liquid B, and the cube in the graduated cylinder.
Answer:
A = 0.691g/cm³
B = liquid A at the bottom, liquid B in the middle and the cube at the top
Explanation:
Hello,
a)
Density = mass / volume
Density = ?
Mass = 2.331g
Volume = ?
Length of the side = 1.5cm
Volume of a cube = L³
Volume of the cube = 1.50³
Volume = 3.375cm³
Density = mass / volume
Density = 2.331 / 3.375
Density = 0.691g/cm³
b) since the question doesn't require submitting a diagram, I would go ahead and answer it without any but explaining the basics for you.
Densities:
Liquid A = 1.004g/cm³
Liquid B = 0.6223g/cm³
Cube = 0.691g/cm³
If the three substance don't mix and are place in a granulated cylinder,
Liquid A would be at the bottom
Liquid B would stay at the middle
The cube would be at the top
Reason is that, when two immiscble liquid are placed in a container, the liquid with the higher density will stay at the bottom while that of lower will float on top.
How did the change of stress (adding or removing reactants or products) cause a shift in the equilibrium system of your solutions? Use data to support your answer. Make sure you discuss all four stress changes: Adding a reactant Adding a product Removing a reactant Removing a product
Answer:
When reactant is added, the equilibrium moves in order to reduce this stress which then makes more product. When a product is added, the equilibrium moves in order for reactants to reduce the stress.
Explanation:
:)
It should be noted that when a reactant is added, the equilibrium moves in order to reduce this stress which then makes more product.
It should be noted that a reactant simply means a substance that takes part in a chemical reaction to form products.
When a reactant is added, the equilibrium moves in order to reduce this stress which then makes more product. Also, when a product is added, the equilibrium moves in order for reactants to reduce the stress. This is vital for the reaction.
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Ionic compounds dissolved in water are better conductors of electricity than when they are in solid form. Why is this true?
Answer: In their bonded, solid states, molecules like salt don't conduct electricity. But when they're dissociated in a solution or through melting, they can carry a current. This is because electrons can't move freely through water (in the same way they do in a conductive wire), but ions can move freely
Explanation:
How many moles of Al would be produced from 12.85 moles of Al2O3?
Al2O3 → AL + O2
Select one:
O a. 25.7
O b. 6.43
O c. 19.3
d. 8.61
PLEASE HELP ME
In this molecule, what's the formal charge on the central O atom?
A. -1
B. -2
C. 0
D. +1
In water, oxygen is covalently bonded to two hydrogen atoms. Oxygen has the formal charge of zero and hydrogens also has the formal charge of zero.
What is formal charge ?Formal charge of an atom is the charge it possess in a compound. The formal charge of an atom is found out from its valence electrons, lone pair of electrons and bond pairs.
The equation of formal charge is written as follows:
Formal charge = Valence electrons - (Lone pair + bond pair)
In water, oxygen covalently bonds to two hydrogen atoms. The bond pair of electrons from oxygen is 2.
number of valence electrons in oxygen = 6
no.of lone pairs = 4
Then FC = 6 - (4 + 2) = 0
Therefore, the formal charge of oxygen in water is zero.
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What qualifications do you need to be a research scientist?
A. High IQ
B. College degree
C. High school diploma
D. Ph.D
Answer:
Ph.D
Explanation:
For the most part, research scientists need a bachelor's degree in a highly associated field. A master's degree or a doctorate is frequently expected.
In a certain chemical reaction, the bonds of the products contain more energy than the bonds of the reactants. For the reaction to occur, which of the following best
describes what occurred?
A. Energy was added, so the reaction is endothermic.
B. Energy was added, so the reaction is exothermic
C. Energy was released, so the reaction is exothermic.
D. Energy was released, so the reaction is endothermic.
Answer:
Energy was added, so the reaction is endothermic.
Explanation:
Answer:
A. Energy was added, so the reaction is endothermic
Explanation: