The VSEPR theory is used toQuestion 4 options:A) determine the partial charge δ on each atom.B) predict crystal structures.C) predict molecular structure.D) predict Lewis structures.

If 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy 25.48 L at STP.

The volume of a gas at STP can be calculated using the direct proportion method.

According to this question, 50.75 g of a gas occupies 10.0 L at STP, then 129.3g of the same gas will occupy the following:

= 129.3 × 10/50.75

= 25.48L

Therefore, if 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy 25.48 L at STP.

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Answer:

The scientific notation is 3.54 × 10^-4

The number 0.000354 in scientific notation can be given or written as 3.54 x 10^(-4).

When a number is too big or too small to be conveniently written in decimal form, or if doing so would require writing out an unusually long string of digits, it can be expressed using scientific notation. It is also known as standard form in the UK and scientific form, standard index form, and standard form.

You can type a caret () or the letter e followed by a number to denote an exponent in scientific notation.

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The volume of carbon dioxide gas forms is equal to 48 L and The volume of oxygen gas needed is 76 L.

A combustion reaction can be explained as a reaction that forms fire and takes place at a high temperature. Combustion Reaction is the combustion of hydrocarbon reacts with oxygen gas to give carbon dioxide and water molecules.

Given the chemical reaction of the combustion reaction of hexane:

\(2C_6H_{14}(g) + 19O_2(g) \longrightarrow 12CO_2(g)+14H_2O(g)\)

Given the volume of hexane = 8.00 L

The number of moles of hexane  = 8/22.4 = 0.357 mol

The moles of oxygen required to react with 0.357 mol of Hexane is equal to :

= (19/2) × 0.357

= 3.39 mol

The volume of oxygen gas = 3.39 × 22.4 = 76 L

The moles of CO₂ produced from 0.357 mol of Hexane is equal to :

= (12/2) × 0.357

= 2.14 mol

The volume of carbon dioxide gas forms = 2.14 × 22.4 = 48 L

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Answer:

223 L

Explanation:

Step 1: Write the balanced equation.

2 LiOH + CO₂ = Li₂CO₃ + H₂O

Step 2: Calculate the moles corresponding to 440 g of LiOH

The molar mass of LiOH is 23.95 g/mol.

440 g × (1 mol/23.95 g) = 18.4 mol

Step 3: Calculate the moles of CO₂ that react with 18.4 moles of LiOH

The molar ratio of LiOH to CO₂ is 2:1. The reacting moles of CO₂ are 1/2 × 18.4 mol = 9.20 mol.

Step 4: Convert 20°C to Kelvin

K = °C + 273.15 = 20 + 273.15 = 293 K

Step 5: Convert 753 torr to atm

753 torr × (1 atm/760 torr) = 0.991 atm

Step 6: Calculate the volume of CO₂

We will use the ideal gas equation.

P × V = n × R × T

V = n × R × T / P

V = 9.20 mol × (0.0821 atm.L/mol.K) × 293 K / 0.991 atm

V = 223 L

The correct IUPAC name of Mn(CN)2 is Manganese II cyanide.

IUPAC is an acronym that stands for International Union of Pure and Applied Chemistry.

This body is in charge of devising the framework for the nomenclature of all chemical substances.

To name an ionic compound,  we must write the name of the metal followed by its oxidation state and lastly the name of the anion.

Hence the name of  Mn(CN)2 is Manganese II cyanide.

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A heat capacity minus A temperature loss equals B heat capacity minus B temperature gain 9.56 °C

Object A is hotter than Object B, and since they are in direct contact, heat can be conducted between them. The conservation of energy principle states that energy cannot be created or destroyed. The energy that item A expends in this situation can only be transferred to object B.

To calculate the amount of energy transmitted, multiply the heat capacity by the degrees of temperature increase or drop, assuming that the mass of both items is the same. Below is the calculation:

Energy acquired by B = Energy lost by A

A heat capacity minus A temperature loss equals B heat capacity minus B temperature gain.

\(4.37J/degree C * 6.3 C= 2.88 J * TbTb= \frac{(4.37 J/ degree C * 6.3 C) }{ 2.88J}Tb= 9.56 degree C\)

Therefore ,A heat capacity minus A temperature loss equals B heat capacity minus B temperature gain 9.56 °C

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They appear as the trait over a recessive allele. Statement C) is true about the dominant alleles.

Dominant alleles are genetic variants that, when present in an individual's genotype, are expressed phenotypically, meaning they determine the visible or observable traits. Dominant alleles are represented by capital letters, while recessive alleles are represented by lowercase letters in genetics.

In terms of inheritance, if an individual has at least one copy of the dominant allele, it will be expressed in the phenotype, regardless of the presence of a recessive allele. This is because dominant alleles exert their influence over recessive alleles, thus "dominating" their expression.

To illustrate this, let's consider a specific example using a trait controlled by a single gene with two possible alleles: dominant (A) and recessive (a). If an individual is homozygous dominant (AA), meaning they possess two copies of the dominant allele, the dominant trait will be expressed.

However, if an individual is homozygous recessive (aa), with two copies of the recessive allele, the recessive trait will be expressed since there are no dominant alleles to override it.

Therefore, dominant alleles appear as the trait over recessive alleles, regardless of the presence or absence of a recessive allele. The presence of even a single copy of the dominant allele is sufficient for its expression in the phenotype. Option C

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Answer:

See explanation below

Explanation:

In this case, we are having a reaction between an anion and alkyl halide. The carbon 1 of the anion will act as nucleophile and will attack the electrophile, which is 5 carbon chain with the bromine in the third carbon.

Now, the nucleophyle is an alkyne of 3 carbon. According to the description, it should be:

CH₃ - C ≡ C⁻

And the alkyl halide is:

CH₃ - CH₂ CH(Br) - CH₂ - CH₃

And the final product after the reaction would be the following:

CH₃ - C ≡ C - CH - (CH₂CH₃)₂

However, in the attached picture you can see this better and the mechanism of reaction.

Hope this helps

Answer:

Have some attraction towards each other

Explanation:

Gases deviate from the ideal gas behavior because their molecules have forces of attraction between them. At high pressure, the molecules of gases are very close to each other so the molecular interactions start operating and these molecules do not strike the walls of the container with full impact.

Hope this helps :-)

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Enjoy your studies and assignments

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ps. I do not own any of these answers so please don't give full credit to me

The type of chemical reaction that occurs when aluminum (Al) reacts with copper nitrate Cu(NO₃)₂ is a single displacement reaction.

Chemicals reactions are reactions that result in permanent changes in the properties of the substances that undergo the changes.

Some examples of chemical reactions are:

Synthesis reactions - these are reactions in which a single product is obtained from the combination of two or more substances.

Combustion reactions - these are reactions where oxygen combines with other elements to release large amounts of heat and light.

Single displacement reactions - these are reactions in which an element or radical replaces another element in a compound.

For example, the reaction of aluminum with Cu(NO₃)₂.

2 Al + 3 Cu(NO₃)₂ --> 3 Cu + 2 Al(NO₃)₃

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We usually represent a synthesis like this:

A + B ------> AB

So, when looking at our equation, it is really similar to it

4 Si + S8 ----> 2 Si2S4

We are combining two compounds to get a different one

Answer:

A

Explanation:

Answer:

think it is D

Explanation:

hope this helps

Answer:

3 grams C₅H₁₀O₅

Explanation:

To find the mass of ribose needed to prepare the sample, you need to

(1) convert the volume from mL to L (1,000 mL = 1 L)

(2) calculate the number of moles (M = moles / L)

(3) convert moles to grams (using the molar mass of ribose)

The molecular formula of ribose is C₅H₁₀O₅. It is important to arrange all of the ratios/conversions in a way that allows for the cancellation of units.

(Step 1)

 200 mL C₅H₁₀O₅                   1 L
----------------------------  x  ----------------------  =  0.2 L C₅H₁₀O₅
                                           1,000 mL

(Step 2)

Molarity (M) = moles / volume (L)                 <----- Molarity ratio

0.1 M = moles / 0.2 L                                     <----- Insert values

0.02 = moles                                                  <----- Multiply both sides by 0.2 L

(Step 3)

Atomic Mass (C): 12.011 g/mol

Atomic Mass (H): 1.008 g/mol

Atomic Mass (O): 15.999 g/mol

Molar Mass (C₅H₁₀O₅): 5(12.011 g/mol) + 10(1.008 g/mol) + 5(15.999 g/mol) = 150.13 g/mol

 0.02 moles C₅H₁₀O₅              150.13 g
----------------------------------  x  -------------------  =  3 grams C₅H₁₀O₅
                                                  1 mole

Considering the definition of molar mass, the correct answer is option c): the mass of 1.85 moles H₂O₂ is 62.9 grams.

The molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.

The molar mass of a compound is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

In this case, you know the molar mass of the elements is:

So, the molar mass of the compound H₂O₂ is calculated as:

H₂O₂= 2× 1 g/mole + 2× 16 g/mole

Solving:

H₂O₂= 34 g/mole

You can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 34 grams, 1.85 moles of the compound contains how much mass?

mass= (1.85 moles× 34 grams)÷ 1 mole

mass= 62.9 grams

Finally, the mass of 1.85 moles H₂O₂ is 62.9 grams.

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Answer:

I believe it's because density is how dense something is. So even if the volume(how much space it takes up in an object) is greater, if the densitity of the object is greater then the density of the water it will sink.

Explanation:

Answer:

19.2 g

Explanation:

Step 1: Write the balanced equation

P₂O₅(s) + 3 H₂O(l) ⇒ 2 H₃PO₄

Step 2: Calculate the moles corresponding to 5.29 g of H₂O

The molar mass of H₂O is 18.02 g/mol.

5.29 g × 1 mol/18.02 g = 0.294 mol

Step 3: Calculate the theoretical yield of phosphoric acid, in moles

The molar ratio of H₂O to H₃PO₄ is 3:2. The theoretical yield of H₃PO₄ is 2/3 × 0.294 mol = 0.196 mol

Step 4: Calculate the mass corresponding to 0.196 moles of H₃PO₄

The molar mass of H₃PO₄ is 97.99 g/mol.

0.196 mol × 97.99 g/mol = 19.2 g

The event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is  Dune movement.

The sand mass of dunes can move either windward or leeward, depending on if the wind is making contact with the dune from below or above its apogee.

If wind hits from above, the sand particles move leeward; the leeward flux of sand is greater than the windward flux.

Thus, the event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is  Dune movement.

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The equilibrium expression for the reaction; C(s) + O₂(g) ------->CO₂(g) is [CO2]/[C] [O2] option C.

The equilibrium expression shows how much of the reactants are converted into products. If the equilibrium constant is large and positive, most of the reactants have been converted into products.

Thus, the equilibrium expression for the reaction; C(s) + O₂(g) ------->CO₂(g) is [CO2]/[C] [O2] option C.

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Answer:

1. Valence electrons are outer shell electrons with an atom and can participate in the formation of chemical bonds. In single covalent bonds, typically both atoms in the bond contribute one valence electron in order to form a shared pair. The ground state of an atom is the lowest energy state of the atom.

2. The answer is in the picture.

3. If the outer shell of the electron is not closed, it is known as a valence electron. In the case of a single covalent bond, both electrons contribute one valence electron to form a shared pair; in the case of an ionic bond, both electrons contribute one valence electron and the bond is known as a single ionic bond.

hope it helps you...

Valence electrons are the electrons located at the outermost shell of an atom and influence the rate of chemical reactions.

Valence electrons are the electrons in the outermost shell, or energy level, of an atom.

For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell.

Also another example for the role of valance electron in chemical reactions is presented in the table attached.

Thus, the evidence from this data table demonstrates that the number of valence electrons strongly influences the chemical behavior of elements.

Elements with a small number of valence electrons tend to lose them to achieve a stable configuration, while elements with a larger number of valence electrons tend to gain electrons.

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Answer:

Hydrogen bonding

Explanation:

Hydrogen bonding is the strongest intermolecular force in water, giving water many of its characteristics and acting to pull water molecules closer to each other.

I hope this helps!

The question requires us to calculate the volume of 0.02 mol of neon gas under standard temperature and pressure conditions (STP).

Under STP, the volume of one mol of any gas corresponds to 22.4 liters of this gas. With that information, we can calculate the volume of 0.02 mol of neon gas as it follows:

1 mol of neon gas ---------- 22.4 L of neon gas

0.02 mol of neon gas ---- x

Then, solving for x, we have that 0.02 mol of neon gas corresponds to 0.448 liters under STP.

Which activity removes a large amount of alcohol from the body? After alcohol has been consumed and reaches the bloodstream, up to 10% of the alcohol is disposed of through the urine, and 80% to 90% by oxidation in the liver. The average drinker eliminates about 2/3 of a standard drink unit (a shot) per hour.

C. It can help us track how quickly element of the climate are changing

Answer:

alkali metals

Explanation:

alkali metals only have one valence electron, meaning they are extremely reactive. they are considered the most reactive on the periodic table.

I fell confident that I can identify the different rates of chemicals.

This is known to be be a powerful diagnostic tool and it is called a reaction's rate. It is one that is seen when we can create methods to increase production by understanding how quickly items are made and what slows down reactions.

Therefore, reaction rate, in regards to chemistry, is seen as the speed with which a said or given chemical reaction moves or functions.

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Answer:

2.409 x 10²⁴

Explanation:

There are two nitrogens for every mole of NH₄NO₃

Since there are two moles, that means there are 4 nitrogens

There are 6.022 x 10²³ atoms in every mole of any element

(6.022 x 10²³) x 4 = 2.4088 x 10²⁴

Use sig figs to round it to 2.409 x 10²⁴

The piece of evidence that best identifies the type of reaction as nuclear or chemical is: Chemical, because a new substance is formed. Option 4

In this scenario, the observation that a new substance is formed is a key characteristic of a chemical reaction. Chemical reactions involve the rearrangement of atoms to form different substances with distinct properties. The formation of a new substance indicates a chemical change has occurred.

The other pieces of evidence listed do not necessarily point to a nuclear reaction:

Chemical, because energy is released during the reaction: Energy can be released in both nuclear and chemical reactions, so this observation alone is not sufficient to determine the type of reaction.

Nuclear, because energy is released during the reaction: While energy can be released in nuclear reactions, it is not exclusive to them. Chemical reactions can also release energy, such as in exothermic reactions.

Nuclear, because the mass decreased after the reaction: This observation suggests a change in mass, which could be indicative of a nuclear reaction. However, it is important to consider that chemical reactions can also involve changes in mass, such as the formation of gases or dissolution of a solid.

Overall, the most conclusive evidence to identify the type of reaction is the formation of a new substance, which aligns with a chemical reaction.

Option 4

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