For the complete redox reaction given, write the half-reactions & identify the oxidizing & reducing agents.4Fe + 3O 2 -> 2Fe 2 O 3

Answer: Potassium (K)

Explanation:

Answer:

Explanation:

Here, we want to get the new pressure

According to the pressure law, temperature and pressure are directly proportional

Mathematically, we have that as:

where:

P1 is the initial pressure which is 65 KPa

P2 is the final pressure that we want to calculate

T1 is the initial temperature which we will convert to Kelvin by adding 273K:

We have T1 as 29 + 273 = 302K

T2 is the final temperature which is also 167 + 273 = 440K

Substituting the values, we have it that:

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

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).

In general, the ions of very late transition metals those towards the right-hand end of the transition metal block, such as copper, silver and gold have high reduction potentials. In other words, their ions are easily reduced.

Again, note that when calculating E∘cell E cell ∘ , standard reduction potentials always remain the same even when a half-reaction is multiplied by a factor. Standard electrode potential - When the concentration of all the species is taken as unity in the half-cell reaction, then the calculated electrode potential is called the standard electrode potential. The reduction potential of a species is its tendency to gain electrons and get reduced. It is measured in millivolts or volts. Larger positive values of reduction potential are indicative of a greater tendency to get reduced. The electrode potential depends upon the concentrations of the substances, the temperature, and the pressure in the case of a gas electrode.

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

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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So,

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

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

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

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.

Answer:

Explanations:

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

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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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.

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.

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

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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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.

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

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

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:

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

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:

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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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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Taking into account the reaction stoichiometry, the theoretical yield of Cu(NO₃)₂ is 8.9717 grams.

In first place, the balanced reaction is:

Cu + 4 NHO₃ → Cu(NO₃)₂ + 2 NO₂ + 2 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.

The following rule of three can be applied: if by reaction stoichiometry 63.55 grams of Cu form 187.55 grams of Cu(NO₃)₂, 3.04 grams of Cu form how much mass of Cu(NO₃)₂?

mass of Cu(NO₃)₂= (3.04 grams of Cu× 187.55 grams of Cu(NO₃)₂)÷ 63.55 grams of Cu

mass of Cu(NO₃)₂= 8.9717 grams

Finally, the maximum amount of Cu(NO₃)₂ is 8.9717 grams.

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0.53L

According to dilution formula:

C1 and C2 are the initial and final concentrations

V1 and V2 is initial and final volume

Given the following parameters

• V1 = 45mL

• C2 = 0.2M

• V2 = 119.4mL

Substitute the given parameters into the formula

Hence the molarity of the nitric acid is 0.53L

• +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

Alcohol

Explanation

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