I got 0.009 and I was wondering if that is right

The word percent is telling us 'percent' is the amount of one part in every hundred (100), so the given statement of the question is false.

Li and Na two elements have chemical properties that are most similar

The element that have the most similar chemical properties are those in the same group or column of the periodic table and one such group includes lithium sodium potassium these element are all shiny and conduct heat and electricity well and have similar chemical properties and the element in a group have the same number of electron in the outermost shell hence they have similar chemical properties

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The system's internal energy decreases while the environment's internal energy rises (option -D) is correct answer.

The internal energy of a system with specific boundaries is composed of the kinetic energy produced by the motion of molecules, the potential energy produced by the vibrational motion, and the electric energy of atoms within molecules. These three types of energy are added together.

The internal energy is equivalent to the system's heat. Since heat is neither created nor destroyed, as the environment's heat level rises, so does the system's heat level.

The gas's state is the only factor that influences its internal energy. In an isothermal process, the volume graph of the change in internal energy in the maximum area under pressure equals the heat supplied in any process. Work is dependent on state but not on a path.

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Answer

4.22 atm

Explanation

Given that:

The initial pressure, P₁ = 6.1 atm

The initial temperature, T₁ = 2.0 °C = (2.0 + 273.15 K) = 275.15 K

The final temperature, T₂ = -83.0 °C = (-83.0 + 273.15 K) = 190.15 K

What to find:

The final pressure, P₂ (atm) of the gas at 83.0 °C.

Step-by-step solution:

The relationship between pressure and temperature of gaseous subtance was decribed by Amonton's gas law.

Amonton's Law states that the pressure of an ideal gas varies directly with the absolute temperature when the volume of the sample is held constant.

Mathematically, we have:

Putting the values of the parameters into the formula, we have:

Thus, the final pressure, (atm) of the gas at 83.0 °C is 4.22 atm.

Answer:

Explanations:

The formula for calculating the percentage by mass of concentration is expressed as;

Answer

Alcohol

Explanation

Alcoholic fermentation is a biochemical process in which yeast and some kinds of bacteria convert sugars into ethyl alcohol and carbon dioxide.

Given that molar molar enthalpy of combustion of cyclohexanone is -3468.1 kJ/mol when liquid water is formed, what is the molar enthalpy of formation of cyclohexanone?

1) First, let's rewrite the chemical equation here:

2 C7H6O3(s) + C4H6O3(l) → 2 C9H8O4(s) + H2O(l)

2) Let's find out how many moles of C9H8O4 have into 500 mg of it. For this, use ese the following equation:

mole = mass/ molar mass

mass = 500 mg = 0.5 g

molar mass of C9H8O4 = 180.16 g/mol (the question give it to us)

mole = 0.5/180.16

mole = 0.0028 moles of C9H8O4

3) Using the chemical equation proportion, we can discover the amount in moles of C4H6O3 needed to form 0.0028 moles of C9H8O4. So:

1 mol of C4H6O3 forms 2 moles of C9H8O4

x mol of C4H6O3 forms 0.0028 moles of C9H8O4

2x = 0.0028

x = 0.0014 moles of C4H6O3

4) We need to find the answer in grams. Let's transform 0.0014 moles of C4H6O3 into grams. For this, use ese the following equation:

mass = mole × molar mas

mass = 0.0014 moles × 102.09

mass = 0.142 grams or 1.42x10⁻¹

Answer: The amount of C4H6O3 that is needed is 1.42x10⁻¹ g.

The first part of Dalton's model is that all matter is made of atoms, and these atoms are indivisible.

The second part of this model is that atoms of an element have identical masses and identical propertes.

At last, the third part of Dalton's model is that all compounds are formed by two or more different type of atoms combined.

Answer:

The specific heat capacity of lead is 0.128 J/g°C.

Mass of lead block = (100.0 g)(26.2oC - 24.8oC)(0.128 J/g°C) / (58.5oC - 24.8oC)

Mass of lead block = 5.45 g

Evaporation is a phenomenon in which atoms of substances in a liquid state obtain enough energy to change to a gaseous state. The movement caused by the temperature of the molecules must be sufficient to overcome the surface tension of the substances and achieve the evaporation process. The molecules must have enough energy to

break intermolecular interactions and go to the gaseous state. Breaking up intermolecular interactions requires energy, which is usually given through heat. Therefore, this process is an endothermic reaction.

ANSWER

Ag+ is the oxidizing agent

Ag+ is reduced to Ag

Zn is oxidized to zn^2+

Zn is the reducing agent

option ABCD

STEP-BY-STEP EXPLANATION:

Given information

From the above redox reaction, you will see that there is a change in the oxidation number of zinc and silver.

Zn goes from 0 to 2+ in its oxidation state

Hence, zinc has been oxidized, therefore, it is a reducing agent

Ag goes from +1 to 0 in its oxidation state

Hence, Ag has been reduced, therefore, it is an oxidizing agent

Answer:

Third option, because copper (Cu) is a stronger oxidizing agent than zinc (Zn).

Explanation:

The table shows the Oxidation Half-Reaction, so the elements oxidizes.

When an element is oxidized, it causes the other element in the reaction to be reduced, therefore the element being oxidized is a reducing agent.

In this case, the correct reaction is:

because, copper (Cu) is a stronger oxidizing agent than zinc (Zn).

The combining of hydrogen and oxygen gas into liquid water is an example of which type of change physical change.

A physical change occurs when hydrogen and oxygen are combined to create water. Concrete breaking up is a physical change. A chemical change occurs when beach sand would be washed out to sea.

When hydrogen will react with oxygen then it will form water. It is a kind of combination reaction. Its chemical reaction can be expressed as:

H2 + O2 → H2O

Therefore, this reaction is an example of physical change.

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ANSWER

A. acetic acid is a weak acid

Explanation

Given

2H2(g) + O2(g) ⇨ 2H2O(g)

Volume = 6.00 L

At STP: Temperature = 273K

Pressure = 1 atm

We know that R constant = 0.0821 L.atm/mol.K

Solution

Step 1: Calculate the number of moles of oxygen at STP

Use the ideal gas law equation:

PV = nRT where P is the pressure, V is the volume, n is the number of moles, R is the gas constant and T is the temperature.

n = PV/RT

n = (1 atm x 6.00 L)/(0.0821 L.atm/mol.K x 273 K)

n = 0.27 mol

Step 2: Use the stoichiometry to find the moles of H2

The molar ratio between oxygen and hydrogen is 1:2

Therefore the moles of H2 = 0.27 x (2/1) = 0.535 mol

Step 3: Calculate the volume of H2

V = nRT/P

V = (0.535 mol x 0.0821 L.atm/mol.K x 273 K)/1 atm

V = 12.0 L

Answer

Volume of hydrogen = 12.0 L

• +Aluminium forms a non- directional metalic bond.

• (bonding in chemistry is the lasting attraction between atoms , ions or molecule )... think of it like joining together of particles / elements

• This type of covalent bonding results in a metallic lattice structure.

• Since aluminium is a metallic solid, the maximum covalency of aluminium is three only.

See the drawing below:

Answer:

Explanation:

Here, we want to get the number of mg of the atom that would remain

Half-life refers to the time taken for exactly half the mass of a radioactive isotope to be lost to radiation

From the question, the half-life is 6 hours

During the first six hours, we have a mass of 60 mg left

In the next 6 hours, which is the second half-life, we have 30 mg left

In the next 6 hours, which is the third half-life, we have 15 mg left

Now, for the next 5 hours, there will not be a complete decay

Thus, we get the decay constant using the following:

Mathematically:

Answer

2.12872 grams of water

Explanation

Given:

Mass of copper (II) sulfate pentahydrate sample = 5.9 grams

What to find:

The grams of water that would be released if all of the water is removed from the 5.9 grams sample of copper (II) sulfate pentahydrate.

Step-by-step solution:

The chemical formula of copper (II) sulfate pentahydrate is: CuSO₄.5H₂O

Molar mass of CuSO₄.5H₂O = 249.68 g/mol

Mass of water in 1 mole of CuSO₄.5H₂O = 5 x molar mass of water = 5 x 18.01528 g/mol = 90.0764 g/mol

the percentage by mass of water in 1 mole of CuSO₄.5H₂O is

Hence, you can now use the % by mass of water in 1 mole of copper (II) sulfate pentahydrate to determine the mass of water that would be released in 5.9 grams of copper (II) sulfate pentahydrate as shown below.

Therefore, the grams of water that would be released if all of the water is removed from the 5.9 grams of copper (II) sulfate pentahydrate is 2.12872 grams

So,

The balanced chemical equation for the decomposition of mercury (II) oxide is:

Average atomic mass of newly discovered element X is 166

What is average atomic mass?

It is calculated by adding the masses of the element's isotopes each multiplied by its natural abundance on Earth

Given data

 Isotope                Mass              % abundance

   15                          71                       71.007

   21                          75                      74.996

   64                          77                       77.112

Contribution made by each isotope by multiplying natural abundance with mass

Average atomic mass

     =  (71 × 71.007 + 75 × 74.996 + 77 × 77.112) / 100

     = 166

Therefore average atomic mass is 166

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The volume of a 0.100 M solution needed is 256 mL.

A chemical reaction, the transformation of one or more chemicals (the reactants) into one or more distinct compounds (the products). Chemical elements or chemical compounds make up substances.

From the question,

The chemical reaction is:

AgNO₃ + HCl → AgCl + HNO₃

The volume of silver ions is V = 16 mL = 0.16 L

Concentration of AgNO₃, c( AgNO₃ ) = 0.160 mol/L

Moles of AgNO₃, n( AgNO₃ ) = 0.16L × 0.160 mol/L = 0.0256 mol

From the reaction,

n( AgNO₃ ) : n( HCl ) = 1 : 1

0.0256 : n( HCl ) = 1 : 1

Therefore,

n( HCl ) = 0.0256 mol

The volume of hydrochloric acid is:

V( HCl ) = n( HCl ) ÷ c( HCl )

V( HCl ) = 0.0256 mol ÷ 0.100 mol/L

V( HCl ) = 0.256 L

V( HCl ) = 256 mL

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A complete combustion reaction like the one you mention is a reaction that will produce carbon dioxide and water using oxygen as the oxidizing agent. The fuel can vary and from there different numbers of CO2 and water will be obtained. Let us first write what the reaction would be taking into account the unbalanced reactants and products:

Now, to balance the equation we must count the number of atoms of each element on each side of the reaction.

In the previous scheme, we see that neither the carbon nor the oxygen are balanced, we can start by balancing the carbon. We have two carbon atoms in the reactants, so we put the coefficient two in front of the CO2 molecule.

I will be updating the scheme as I describe the procedure so that you are aware of it.

Now we must balance the oxygen, we have 5 atoms in the products and two in the reactants. To balance it, since we have an odd number in the products, we must adjust it to an even number. We place coefficient 2 in front of the H2O molecule. We have 6 oxygen atoms in the products, to have 6 oxygen atoms in the reactants we must place the coefficient 3 in front of the O2 molecule.

Now we have 6 oxygen atoms on each side of the reaction, we continue now with hydrogen. We have 4 hydrogens in the reactants, so we put the coefficient 2 in front of the C2H2 molecule.

Now the hydrogen is balanced, but the number of carbons changed and we must balance them again. We place the coefficient 4 in the CO2 molecule, so we will have 4 carbons on each side of the reaction.

In doing so, the number of oxygens was modified, so to finally have a balanced reaction we put the coefficient 5 in the O2 molecule to have 10 oxygen atoms on each side.

So, the balanced reaction will be:

Answer: Potassium (K)

Explanation:

Assume that C₂H₂F₄ vapor is an ideal gas and use the ideal gas law to find the volume of the vapor.

First, use the molecular mass of the compound to find the number of moles present in 0.110g of the compound.

Convert the temperature in celsius to kelvin:

Use the ideal gas law and solve it for V:

Replace for the known values (R, the ideal gas constant is 0.082 atmL/molK):

The volume of the vapor is 0.0306L.

1) First let's calculate the molar mass of O₂ and H₂:

O₂: (16x2) = 32 g/mol (for both oxygen 1 and 2)

H₂: (1x2) = 2 g/mol

2) Now let's calculate the mass of gas sample (g) of:

Oxygen 1:

mass = mole x molar mass

mass = 1 x 32 = 32 g

Mass of Oxygen 1: 32 g

Oxygen 2:

mass = mole x molar mass

mass = 2 x 32 = 64 g

Mass of Oxygen 2: 64 g

Hydrogen:

mass = mole x molar mass

mass = 1 x 2 = 2 g

Mass of Hydrogen: 2 g

For the two oxygen samples, if the number of moles double, the mass double and the volume also double.

But the two gases of the same volume have different masses (Hydrogen 2 g and

oxygen 32 g). So there is no relationship between volume and mass for different gases.

Let us first clarify the difference between a chemical process and a physical process.

In a physical process to a modification of the chemical structure of the molecule, either by breaking or because it is coupled to another molecule.

In a chemical process, the structure at the molecular level is not affected, this can be, for example, a reduction in size at the macro level, that a substance is transported from one place to another.

Now, looking at the three options that show us, we have three physical processes.

1. The first option corresponds to a displacement of food, this is a physical process.

2. The second option is a macro level size reduction, also a physical process.

4. The fourth option is an adsorption process, this can be a physical process or a chemical process, but in this case, the molecules of a substance adhere to the walls of the intestine without changing its chemical nature, so it will be a physical process.

3. Now, the third option is the breakdown at the molecular level of the food using enzymes, this is a chemical reaction, so it is a chemical process and this will be the answer.

Answer: Food being broken down by enzymes in your stomach

Answer:

C = 0.068 M

Explanation:

We are given: volume of HNO = 0.125 L

: volume of Ba(OH)2 = 42.7 mL

: concentration of Ba(OH)2 = 0.100 M

We first determine the number of moles of Ba(OH)2:

n = CV

Where: n is number of moles, C is concentration, and V is volume

n = CV

= 0.0427 * 0.100

= 0.00427 mol

From the balanced equation:

n(HNO3) = 2 * n(Ba(OH)2)

= 2 * 0.00427

= 0.00854

For HNO3:

C = n/V

= 0.00854/0.125

= 0.068 M

Ibuprofen has a molecular formula of C13H18O2, meaning it has 13 carbon atoms, 18 hydrogen atoms, and 2 oxygen atoms.

The molar mass of ibuprofen (206 g/mol) is determined by adding up the atomic masses of each element in the molecule:  

C (12.01 g/mol) + H (1.01 g/mol) + O (16.00 g/mol) = C13H18O2  

Ibuprofen's percent composition (75.7% C, 8.80% H, 15.5% O) can be used to determine the number of each type of atom in the molecule:  

13 C atoms x 100% = 75.7% C  

8.80 H atoms x 100% = 8.80% H

15.5 O atoms x 100% = 15.5% O  

Thus, ibuprofen has 13 carbon atoms, 8 hydrogen atoms, and 15 oxygen atoms.

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Answer

2.22 x 10⁻⁷ M

Procedure

To calculate the [OH⁻] concentration of blood we will consider the following pH formulas

pH=-log [H₃O⁺]

pH+pOH=14

The pH of blood will be

Then we do the rest

Lastly, we transform from pOH to concentration