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10th Grade Honors Chemistry Final Exam Questions And Answers Well Illustrated 2024.

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10th grade honors chemistry final exam questions a

Institution 10th Grade Honors Chemistry
Course 10th Grade Honors Chemistry

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10th Grade Honors Chemistry Final
Exam Questions And Answers Well
Illustrated 2024.

Thermochemistry - correct answer. The study of heat effects in chemical reactions.

Exothermic Reaction - correct answer. A reaction that releases energy in the form of
heat.

Examples: Combustion, freezing water.

Heat generated is added to the product side (right side) because heat is released.

Endothermic Reaction - correct answer. A reaction that absorbs energy in the form of
heat.

Examples: Melting ice, evaporating liquid water, boiling water.

Heat generated is added to the reactant side (left side) because heat is added.

Enthalpy (H or ∆H) - correct answer. The energy after taking into account the pressure
and volume of a substance.

If pressure remains constant, then heat absorbed or released during a chemical
reaction is equal to the enthalpy change for the reaction.

∆H = - correct answer. H Products - H Reactants.

Standard State of Element (Temperature and Pressure) - correct answer.
Temperature = 25° Celsius.
Pressure = 1 atm.

ΔH° - correct answer. Standard enthalpy change = the heat transferred in a reaction
with reactants and products in standard states.

,Determining Enthalpy Change - correct answer. ΔH = (-) Exo.
ΔH = (+) Endo.

If heat is released as in an exothermic process the temperature will increase, but the
product will have less energy than the reactant so enthalpy will be negative.

If heat is absorbed as in an endothermic process the temperature will decrease, but the
product will have more energy than the reactant so enthalpy will be positive.

Sign of ΔH in a Reversed Equation - correct answer. Sign changes if equation is
reversed.

Heat Capacity - correct answer. Amount of heat needed to raise the temperature of an
object 1° Celsius.

Specific Heat - correct answer. Amount of heat needed to raise the temperature of 1
gram of a substance.

Heat - correct answer. Transfer of kinetic energy from a hotter object to a colder
object.

Enthalpy Problems - correct answer. 1. Convert given mass to moles.
2. Use ΔH (Given in problem)/# of mols from balanced equation.

Example: State whether the following reaction is endothermic or exothermic and
whether the reactants or the products contain more stored heat energy. Then find the
quantity of head transferred when 6.29 grams of sulfur dioxide completely.

2SO2 (g) + O2 ---> 2SO3 (g), ΔH° = -197.8 kJ

Reactant has more stored heat energy.

S = 32.
O = 16 x 2 = 32.

6.29 g SO2 x 1 mol SO g / mol SO2.

.10 mol SO2 x -197.8 kJ / 2 mol SO2 = -9.89 kJ heat transferred

Elastic Collision - correct answer. Collision particles of an ideal gas undergo.

Ensures that energy is not lost.

In collisions between ideal gas molecules, the total energy of the gas... - correct
answer. remains the same.

, Volatile - correct answer. Evaporates easily.

Pressure - correct answer. Force per unit area.

760 mm Hg = 1 atm = 101,325 Pa = 101.325 kPa.

Boyle's Law - correct answer. Pressure of a gas is inversely proportional to its volume.

The temperature of a gas doesn't change.

P1V1 = P2V2.

Charle's Law - correct answer. At constant pressure, the volume of a fixed
amount of gas is directly proportional to its absolute temperature.

V=k2T

V1T2=V2T1.

Avogadro's Law - correct answer. Equal volumes of gases at the same
temperature and pressure contain an equal number of particles.

V=k3n.

Manometer Measures - correct answer. Difference in pressure between the two
columns of mercury.

Physical Properties of Gases/Kinetic Molecular Theory - correct answer. 1. A gas
consists of small particles that have mass.
2. The particles in a gas must be separated from each other by relatively long distances.
3. The particles of a gas must be in a constant, rapid motion.
4. Collision of gas particles are perfectly elastic.
5. The average kinetic energy (energy of motion KE=mv^2/2) articles depend only on
the temperature of the gas. If you increase the temperature of a gas, you increase the
movement of molecules which increases the pressure.
6. Gas particles exert no force on each other.

Four things that change with relation to gas: - correct answer. - Amount of gas.
- Pressure.
- Temperature.
- Volume.

Amount of Gas - correct answer. You can relate the number of moles and the mass to
the number of gas particles.

n = mass / molar mass.

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