what are the relevant equations for oxidation and reduction

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In an exothermic reaction, the reactants have more energy than the products.

Answer:

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Q methane = Q water

Q = mcΔt

mass water = V x ρ = 1 L x 1 kg/L = 1 kg

298 K to 373K = 25 °C to 100 °C

c water = 75.2 J/mol K = 4.2 J / g °C = 4200 J/kg °C

Q water = 1 x 4200 x (100 - 25)

Q water = 315000 J

Q methane = Q water = 315000 J = 315 KJ

n (mol) methane = ΔH/Q = 890.4 / 315 = 2.83

PV = nRT

V = nRT/P

V = 2.83 x 0.082 x 298/1

V = 69.15 L

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Answer:

I don't know I'm rich student

Explanation:

sorry

Taking into account the definition of density, the volume of a full tank car which contains 3.22×10⁴ kg of acetone is 41.02 m³.

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

[tex]density=\frac{mass}{volume}[/tex]

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, you know that:

Replacing in the definition of density:

[tex]0.785 \frac{g}{cm^{3} }=\frac{32,200,000 g}{volume}[/tex]

Solving:

volume×0.785[tex]\frac{g}{cm^{3} }[/tex]= 32,200,000 g

volume=[tex]\frac{32,200,000 g}{0.785 \frac{g}{cm^{3} }}[/tex]

volume= 41,019,108.28 cm³=  41.01910828 m³≅ 41.02 m³ (being 1 m³ = 1000000 cm³)

In summary, the volume of a full tank car which contains 3.22×10⁴ kg of acetone is 41.02 m³.

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mass MgCl₂ = mol x MM MgCl₂ = 0.05 x 95.211 g/mol = 4.76 g

mass Cl in MgCl₂ :

= (2 x AM Cl)/MM MgCl₂ x mass MgCl₂

= (2 x 35.5 g/mol)/95.211 g/mol x 4.76

= 3.55 g

% mass Cl in the mixture :

= (mass Cl / mass mixture) x 100%

=  3.55 / 9.8 x 100%

= 36.22%

The mass and volume has direct proportional to each other.

The volume of the object is directly proportional to its mass which means that if the volume increases the mass of the object increases also increase and vice versa. Due to this direct relationship, the line of regression will go straight between X and Y axis.

So we can conclude that mass and volume has direct proportional to each other.

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Answer:

Explanation:

The equation says for every 3 moles of barium chloride you can make 2 aluminum chloride.

(8/3)*2 = 5.33 moles

50.97 g AgNO₃ is needed to make 500.0 mL of 0.600 mol/L AgNO3(aq)

A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Molar mass of AgNO₃ = (107.9 + 14.0 + 16.0×3) g/mol = 169.9 g/mol

Molarity = Moles of solute ÷ Volume of solution in litre

0.600 mol/L = Moles of solute ÷ 0.5 mL

Moles of solute =0.3 mol

Moles =[tex]\frac{mass}{molar \;mass}[/tex]

0.3 mol =  [tex]\frac{mass}{169.9 g/mol}[/tex]

Mass =50.97 g AgNO₃

Hence, 50.97 g AgNO₃ is needed to make 500.0 mL of 0.600 mol/L AgNO3(aq).

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Answer:

2

Explanation:

final velocity: 20

initial velocity: 0

time taken: 10

acceleration: ?

a=( v-u)÷2

a=(20-0)÷2

a=20÷2

therefore acceleration =2

The time taken for the object to reach to top of pile is 0.012 year.

The time taken for the object to reach to top of pile is calculated as follows;

time of motion = distance traveled/speed

time of motion = (1.1 x 10¹⁴ x 10³ m)/(3 x 10⁸ m/s)

where;

time of motion = 3.67 x 10⁵ sec = 0.012 year

Thus, the time taken for the object to reach to top of pile is 0.012 year.

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Answer:The first model (full container) represented matter that has a definite shape. The particles were packed tightly and did not have the freedom to rearrange themselves.

Explanation:

Hydrogen, iron, and gallium is the correct answer. Hence, option B is correct.

An electron is a negatively charged subatomic particle.

Let us take another look at the periodic table. The periodic table is composed of metals, metalloids and nonmetals.

Metals lose electrons more easily, that is why they form cations. Metals are found on the left-hand side of the periodic table.

As we move away from the left-hand side of the periodic table, the ability to form cations decreases as metallic character decreases and elements become more nonmetallic.

The noble gas helium rarely loses electrons. Fluorine would rather accept an electron to form a negative ion.

Hence, the elements hydrogen, iron and gallium are metals hence they lose electrons more easily.

Hence, option B is correct.

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If the molecules of air are added continuously to the inflatable bag of the car then the pressure of the molecule will decrease as given by Boyle's law.

Boyle's law is a gas law that establishes the relation between the volume and the pressure of the gas. It states the inverse correlation between the two factors respective to the constant temperature.

Boyle's law is given as:

P₁V₁ = P₂V₂

Where an increase in the volume will decrease the pressure of the gas. So, if the air molecules are added to the bag then the pressure inside will reduce.

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The mass of the ethylene glycol used is 14.26 g

The freezing point is the temperature at which a liquid is converted to a solid.

Given that;

ΔT = 0.0°C - ( -4.3°C) = 4.3°C

ΔT = 4.3°C

But we know that

ΔT = k m i

m = ΔT/k i

m = 4.3°C/1.86 °C/m * 1

m = 2.3 m

Now;

Let the mass of  ethylene glycol be m

Molar mass of  ethylene glycol = 62 g/mol

Mass of solvent = 100.0 g or 0.1 Kg

Then;

2.3= m/62/0.1

2.3 = m/62 * 0.1

m = 2.3 * 62 * 0.1

m = 14.26 g

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Bromine has larger ionic radius and atomic radius than fluorine.

Fluorine has larger ionisation energy and electronegativity than bromine.

Halogen are those elements that are found in group 7 of the periodic table.

Fluorine is in period two of the periodic table, meaning that it contains electrons in only the first two energy levels at ground state. It has a higher ionization energy and electronegativity than bromine.

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Indicate whether fluorine or bromine has a larger value for each of the following properties. a. electronegativity b. ionic radius c. atomic radius d. ionization energy

Answer:

two may be the answer (2)

Answer:

False

Explanation:

There are two types of covalent bonding: polar covalent boding and nonpolar covalent bonding. During polar covalent bonding, the electrons are not shared evenly. This is due to the electronegativity differences between the two atoms. During nonpolar covalent bonding, the electrons are shared evenly.

Distillation is the process which involves the separation of pure water from impure water.

This is a technique which is used to purify through the boiling and cooling processes in the laboratory and typically involves the use of a liebig condenser.

Pure water is usually collected at 100° celsius with the impurities remaining and filtered out during the process. This is therefore the most apporpriate way of separating pure water from impure water.

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Explanation:

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The correct statement is Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons.

In a simple way to explain, Isotopes are species that have the same atomic number and mass number.

In this case, we can say that the correct statement is proton number of isotopes of an element is same.

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Given the heat of fusion of water is 6.02 kJ/mol, it takes 12.9 kJ of heat to melt 38.6 g of ice at 0 °C.

Fusion, commonly known as melting, is a physical process in which matter passes from the solid to the liquid state.

We have ice with a mass of 38.6 g at 0 °C. First, we will convert mass to moles using the molar mass of water.

38.6 g × (1 mol/18.02 g) = 2.14 mol

The heat of fusion (ΔH°fus) for water is 6.02 kJ/mol. The heat (Q) required to melt 2.14 moles of ice is:

Q = 6.02 kJ/mol × 2.14 mol = 12.9 kJ

Given the heat of fusion of water is 6.02 kJ/mol, it takes 12.9 kJ of heat to melt 38.6 g of ice at 0 °C.

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%yield = actual/theoretical x 100%

%yield = 16/24 x 100%

% yield = 67%

Answer:

1.76 * 6.02*10^23 = 1.05952*10^24

1.05952*2 = 2.11904 *10^24 oxygen and 1.05952*10^24 sulfur atoms

In 1.76 moles of SO₂, there are approximately 1.06 x 10²⁴ SO₂ molecules, 1.06 x 10²⁴ sulfur atoms, and 2.12 x 10²⁴ oxygen atoms. For determining the number of SO₂ molecules, sulfur atoms, and oxygen atoms in 1.76 moles of SO₂, we need to use Avogadro's number, which is approximately 6.022 x 10²³ particles per mole.

1 mole of any substance contains Avogadro's number of particles, which includes atoms or molecules. Therefore, to find the number of SO₂ molecules in 1.76 moles, we can multiply 1.76 moles by Avogadro's number:

Number of SO₂ molecules = 1.76 moles × Avogadro's number

Number of SO₂ molecules = 1.76 moles × 6.022 x 10²³ molecules/mol

Number of SO₂ molecules ≈ 1.06 x 10²⁴ molecules

Next, we can find the number of sulfur atoms and oxygen atoms in 1.76 moles of SO₂. In one molecule of SO₂, there is 1 sulfur atom and 2 oxygen atoms. So, the total number of sulfur atoms and oxygen atoms can be calculated as follows:

Number of sulfur atoms = Number of SO₂ molecules × 1 sulfur atom/molecule

Number of sulfur atoms = 1.06 x 10²⁴ molecules × 1 sulfur atom/molecule

Number of sulfur atoms ≈ 1.06 x 10²⁴ sulfur atoms

Number of oxygen atoms = Number of SO₂ molecules × 2 oxygen atoms/molecule

Number of oxygen atoms = 1.06 x 10²⁴ molecules × 2 oxygen atoms/molecule

Number of oxygen atoms ≈ 2.12 x 10²⁴ oxygen atoms

So, in 1.76 moles of SO₂, there are approximately 1.06 x 10²⁴ SO₂ molecules, 1.06 x 10²⁴ sulfur atoms, and 2.12 x 10²⁴ oxygen atoms.

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The nuclear fission reaction with the formation of the deuterium has the missing part as ⁴₂He.

Nuclear radiation is given as the reaction in which the emission is formed in the form of the nuclear particles that made the change in the nucleus of the atom.

The nuclear radiation that made the release of ₁¹H can be given to fuse the electron with the He and form:

²₁H + ³₂He →⁴₂He + ₁¹H

Thus, the missing part in the nuclear fission reaction is ⁴₂He.

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We can say that the volume of the object is directly proportional to its mass. As the volume increases the mass of the object increases in direct proportion. The gradient of the graph equals the density of the material.

Answer: By blowing into the drinking straw to bubble some of their breath in the water, they are adding gas to the water. This will cause the volume of gas to increase.

The students want to increase the volume of gas the pond weed makes in 5 minutes. The students use a drinking straw to bubble some of their breath into the water. The volume of gas the pond weed makes increases because By blowing into the drinking straw to bubble some of their breath in the water, they are adding gas to the water.

This will cause the volume of gas to increase. One way the students could increase the volume of gas the pond weed makes in five minutes is by increasing light intensity. Pond weeds carry out photosynthesis to produce oxygen and light is an essential factor that affects rate of photosynthesis.

If light intensity is increased, more light energy will be available for plant to convert into chemical energy, which can be used in photosynthesis to produce more oxygen. This increases the volume of gas the pond weed makes in given time.

To increase the light intensity, students could move plant closer to a light source or use stronger light source.

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The enthalpy change for the reaction is 1215.75  kJ/mol.

The term enthalpy change is the energy that accompanies a reaction. Now we have the reaction;  4HNO3(g) + 2H2O(g) → 2N2H4(g) + 7O2(g)

ΔHf HNO3(g) = -134.31 kJ/mol

ΔHf  H2O(g)=     -241.83  kJ/mol

ΔHf N2H4(g) =  97.42 kJ/mol

ΔHf O2(g) = 0  kJ/mol

ΔHreaction = [(2 * 97.42) + ( 7 * 0)] -  [ (4 * -134.31 ) + (2 * -241.83 )

= 194.84 - (-537.25 - -483.66)

=1215.75  kJ/mol

The enthalpy change for the reaction is therefore 1215.75  kJ/mol.

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The partial pressure of oxygen, P(O₂) is 198.83 mmHg.

The partial pressure of a gas is the pressure gas will exert in a mixture of gases which do not react chemically together.

The sum of partial pressure of gases at atmospheric pressure = 760 mmHg

P(N₂) +  P(H₂O) + P(CO₂) + P(O₂) + P(other) = 760 mmHg

P(N₂) = 0.72 atm = 547.2 mmHg

P(H₂O) = 7.7 torr = 7.7 mmHg

P(CO₂) = 0.37 mmHg

P(other) = 0.97 kPa = 5.9 mmHg

P(O₂) = 760 - (547.2 + 7.7 + 0.37 + 5.9) = 198.83 mmHg

Therefore, the partial pressure of oxygen, P(O₂) is 198.83 mmHg.

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