A sample of carbon dioxide occupies a 5.13 dm3 container at STP. What is the volume of the gas at a pressure of 286.5 kPa and a temperature of 12.9°C?

Answer:

the core

Explanation:

Answer:

3rd option, the core.

Explanation:

The percent composition of nitrogen in sodium nitride is approximately 16.87%.

The percent composition of nitrogen in sodium nitride (Na₃N) can be calculated by determining the molar mass of nitrogen and the molar mass of the compound as a whole.

molar mass

molar mass of nitrogen = 14.01 grams

molar mass of sodium nitride = (3 * molar mass of Na) + (1 * molar mass of N)

molar mass of sodium nitride = (3 * 22.99 g/mol) + (1 * 14.01 g/mol)

molar mass of sodium nitride =  82.98 g/mol

percent composition of nitrogen

Percent composition of nitrogen = (molar mass of N / molar mass of  Na₃N) * 100

Percent composition of nitrogen = (14.01 g/mol / 82.98 g/mol) * 100

Percent composition of nitrogen = 16.87%

Therefore, the percent composition of nitrogen in sodium nitride is approximately 16.86%.

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Answer:

Explanation: because more is always better

Answer:    

Darwin observed   many  different   types of mockingbirds and finches lived in different island environments.

Answer:

The rate reduces by a factor cf /2.

Step 1

The reaction:

Ca(OH)2 (aq) + 2 HBr (aq) => CaBr2 (aq) + 2 H2O (l) (compelted and balanced)

----------------

Step 2

Information provided:

0.0105 M HBr

125 mL of 0.0100 M Ca(OH)2

----------------

Step 3

The number of moles of Ca(OH)2:

Molarity (mol/L) = moles of Ca(OH)2/volume of the solution (L)

Volume = 125 mL x (1 L/1000 mL) = 0.125 L

Therefore,

Molarity x volume (L) = moles

0.0100 mol/L x 0.125 L = 1.25x10^-3 moles of Ca(OH)2

-----------------

Step 4

The number of moles of HBr, by stoichiometry:

Ca(OH)2 (aq) + 2 HBr (aq) => CaBr2 (aq) + 2 H2O (l)

1 mol Ca(OH)2 ------ 2 moles HBr

1.25x10^-3 moles ------ X

X = 1.25x10^-3 moles x 2 moles HBr/1 mol Ca(OH)2

X = 2.5x10^-3 moles HBr

----------------

Step 5

The volume of HBr needed:

Molarity = moles of HBr/volume of solution (L)

Volume = moles of HBr/molarity

Volume = 2.5x10^-3 moles HBr/0.0105 mol/L

Volume = 0.238 L

Volume = 0.238 L x (1000 mL/1 L) = 238 mL

Answer: 238 mL or 0.238 L (there are no matches)

Answer:

Any solid may be sublimed if its temperature and pressure are below its triple point. For example, if you were to freeze water into ice and cool it further and then reduce the pressure, you could get ice to sublime. Some other examples include: Dry ice (solid CO2) which sublimes at atmospheric pressure and -78 C, and C60 (buckyballs) which sublimes at atmospheric pressure at around 800 K.

Explanation:

Answer:

P O 2 = 5.21 atm P C O 2 = 4.79 atm

Explanation:

Hope it helps!

it's an ionic bond

btw i love your profile picture never understand is one of my favorites

Gravity, as a fundamental force of nature, is influenced by several factors. The following are some of the key factors affecting gravity:

All of the following options correctly describe a phase equilibrium:

- A phase equilibrium occurs when no phase change is occurring.

- If the rate of condensation is equal to the rate of evaporation, a phase equilibrium exists.

- At equilibrium, the amount of the substance in each phase remains constant.

- There are equal amounts of each phase present at equilibrium.

However, the statement "a system must be closed in order for a phase equilibrium to be established" is not entirely accurate. A system can still reach phase equilibrium in an open system as long as the rates of evaporation and condensation are balanced, even though there may be a net transfer of material between phases.

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Answer:

Hardness.

Lustre.

Colour.

Crystal Structure.

Explanation:   hope i helped :0

Answer:

There are 6 types of characteristics for rocks and minerals.

They are:  

- Hardness (is a measure of the mineral's resistance to being scratched, The Mohs Hardness scale is how we measure the hardness, for example : 1= Softest  10= Hardest )

- Lustre ( some minerals are shiny and some are dull, lustre means metallic  or non metallic. )

- Color ( Color is a important property of a mineral and  helps identify a mineral but doesn't totally identify it.)  

- Crystal Structure ( Crystal structure is another way to figure out what type of rock or mineral it is. The mineral or rock must have straight edges, flat sides, and regular angles. )

- Streak ( Streak refers to the colour pouder that the mineral leaves after it scratches it. )

- Cleavage and fracture ( Cleavage is a way the mineral breaks and fracture is a breakage is rough and has jagged edges. )

Isomers are compounds that have the same molecular formula but different arranged differently of the atoms.

For example

So even if they have the same proportion of their atoms, the chemical identity is different

The answer is option B: no because more than one compound can have the same ratio of masses of elements if the atoms are arranged differently.

The group of elements in which Argon placed along with Neon and helium is called Noble gases.

Noble gases can be demonstrated as the 6 elements that belong to group 18 of the modern periodic table. These 6 elements in group 18 are Helium, Neon, Argon, Krypton, Xenon, and Radon.

Under standard conditions of pressure and temperature, all noble gases exist in the gaseous form and exhibit extremely low chemical reactivity therefore they are named inert gas.  All the noble gases possess stable electronic configurations as their valence shell are fully filled. Therefore, the elements are found in monoatomic gases.

The general configuration of the noble gases can be represented as ‘ns²np⁶’ where n is the principal quantum number.

Therefore Argon is a noble gas so they have completely filled electronic configurations, and very little tendency to lose or gain an electron or inert nature.

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Answer:

that would be B

Explanation:

Answer:

An atom of Sulfur

Explanation:

i did a Quick search and im trying to get pass the "help a person first"

Answer:

• A collection of atoms of Sulfur

Explanation:

I'll assume the notation is written as \(S_{8}\).  A subscript after an element symbol represent the number of individual atoms of the symbol.  In this case \(S_{8}\) is telling us we have 8 sulfur atoms that are somehow connected to each other.  That is in contrast with 8S, which means we have 8 different sulfur atoms.  A chemical formaula, such as \(CH_{4}\) tells us we have a molecule containing 1 carbon atom and 4 hydrogen atoms.

The reactants, products and arrow pointing towards products are present in every chemical equation.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

5moles

Explanation:

number of moles=mass/molar mass

The molar mass of water is 18.0 g/mol. A mass of 90.0 grams of water is equivalent to 5 moles. Therefore, option B is correct.

The mass in grams of one mole of a substance is defined as its molar mass. Molar mass is measured in grams per mole, abbreviated as g/mol. The isotopic atomic mass of a single isotope of any given element is a value that compares the mass of that isotope to the mass of the isotope carbon-12.

A compound's molar mass can be calculated by adding the standard atomic masses (in g/mol) of its constituent atoms.

A compound's molar mass indicates the mass of one mole of that substance. In other words, it tells you how many grams of a compound there are per mole. As a result, the units for molar mass are grams/mole.

number of moles = mass / molar mas

=  90.0 grams /  18.0grams

= 5 moles

Thus, option B is correct.

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Answer:

1. the apperance of a solution is clear while that of a colloid is dull

2. colloids are heterogenou while solutions are homogenous

Answer:

Empirical formula: CO₂

Explanation:

The empirical formula is defined as the simplest ratio of atoms present in a molecule. We must convert the mass of carbon and oxygen to moles as follows:

Carbon -Molar mass: 12.01g/mol-

3.0g * (1mol / 12.01g) = 0.250 moles C

Oxygen -Molar mass: 16g/mol-

8.0g * (1mol / 16g) = 0.50 moles O

The ratio of O:C is:

0.50mol / 0.250mol = 2

That means the empirical formula is:

There are 7.2 moles of oxygen in the given sample of MTBE. This is calculated based on the fact that each mole of MTBE contains 3 moles of oxygen and 4 moles of hydrogen.

Based on the chemical formula for methyl tert-butyl ether (MTBE), we can see that there are 3 atoms of oxygen in each molecule of MTBE. Therefore, if we have 9.6 moles of hydrogen in a sample of MTBE, we can calculate the number of moles of oxygen in the sample as follows: For every mole of MTBE, there are 3 moles of oxygen. So, if we have 9.6 moles of hydrogen, we must have consumed 9.6/4 = 2.4 moles of MTBE (since each mole of MTBE contains 4 moles of hydrogen).
Therefore, the number of moles of oxygen in the sample is:
2.4 moles MTBE x 3 moles oxygen/mole MTBE = 7.2 moles oxygen
So, there are 7.2 moles of oxygen in the sample of MTBE.

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Answer:

o cany give because of i am in 9th

The physical mechanism causing the change in strength when using brine as the pore fluid is the presence of salt ions that weaken the interparticle bonds. Salt can reduce the shear strength of clays by increasing the repulsive forces between clay particles.

The strength of clay types at 50% water content can vary depending on whether DI water or brine is used as the pore fluid. Generally, there is a significant difference in strength between the two.

The presence of salt in brine can have an effect on the shear strength of clays. When salt is dissolved in water, it creates ions that can interact with the clay particles. These interactions can lead to the formation of electrical double layers around the clay particles, which can increase the interparticle repulsion and decrease the shear strength of the clay.

On the other hand, when DI water is used as the pore fluid, there is no presence of salt ions to affect the interparticle interactions. As a result, the clay particles can have stronger bonds and higher shear strength compared to when brine is present.

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The false statement among the options is  An acid-base indicator can be non-polar. Option e is correct answer.

An acid-base indicator is a substance that undergoes a color change in the presence of an acid or a base. It is typically a weak acid or a weak base that can exist in different forms, each having a different color. When an indicator is in its acidic form, it may be represented as an acid (option a) and have a specific color. Similarly, when it is in its basic form, it can be considered as a base (option c) and exhibit a different color. Therefore, options a and c are true statements.

Furthermore, an indicator can have one highly colored form (option b) or two highly colored forms (option d), depending on its acid-base equilibrium and the pH of the solution. For example, litmus is a commonly used indicator that exists in two forms: red in acidic solutions and blue in basic solutions.

However, the statement in option e, that an acid-base indicator can be non-polar, is false. Acid-base indicators are typically polar compounds because they contain functional groups that are involved in acid-base reactions. The polar nature of the indicator molecules allows them to interact with polar solvents and participate in the necessary chemical reactions for color changes.

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Answer:

acid donates protons while base accept protons

Explanation:

Answer:

electrons/electron density

Explanation:

The branch of science that deals with electrons are called chemistry. An element consists of electrons, protons, and neutrons.

The correct answer to the question is electrons density.

In the cloud model,  the electrons are revolving around the nucleus. In an atom when the electron's density is very high which represents a cloud.

Hence, the correct answer is electrons.

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Answer:

For those who need it, the answers are N, O, R

Explanation:

To solve such this we must know the concept of redox reaction. Therefore, the given reaction is an oxidation and reduction reaction. The oxidation reaction is Mg \(\rightarrow\) MgCl\(_2\) and reduction reaction is HCl \(\rightarrow\)  H\(_2\) .

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

Redox reaction is a chemical reaction where oxidation and reduction takes place simultaneously. Oxidation is loss of electrons and reduction is gain of electrons. The electron transfer from oxidant to reductant.

Mg + 2HCl \(\rightarrow\) MgCl\(_2\) + H\(_2\)

Mg \(\rightarrow\) MgCl\(_2\) O

HCl \(\rightarrow\)  H\(_2\)      R

Therefore, the given reaction is an oxidation and reduction reaction.

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A silver precipitate is created when silver nitrate, AgNO3, and magnesium bromide, MgBr2, are combined in aqueous solutions.Create the net ionic equation as well as the balanced formula equation for this reaction.

The end products of the reaction between aqueous systems of magnesium chloride (MgCl2) and silver nitrate (AgNO3) are solid silver chloride and aqueous magnesium nitrate.

The right response is (CH3)3C-Cl.The most reliable 3° carbocation is formed by tert-butyl chloride, or (CH3)3C - Cl.As a result, it will immediately produce the white precipitate of AgCl in AgNO3 solution.

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