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Worksheets8 Thermo Test Review Honors
Total questions: 43
Worksheet time: 2hrs 2mins
If two molecules remain in contact, the heat will flow from the warm molecule to the
cooler molecule
smaller molecule
hotter molecule
larger molecule
With molecules, a chemical reaction and a change in physical state commonly involve
mixture of oxygen and water
positive ions
acidic solutions
release or absorption of heat
Which of the following will cause the molecules in liquid water to move slower?
boiling
freezing
larger container
explosion
Liquid water has a higher temperature than ice, which means that
liquid water molecules move faster than ice molecules
liquid water molecules move randomly while ice molecules do not move
ice dissolves water
ice molecules move faster than water molecules
A can of cold soda and a container of hot soup are placed in an insulated ice chest. Assuming that the interior of the ice chest is thermally insulated from the outside, which correctly describes the changes in energy of the soda and the soup over time?
The soda and soup molecules eventually reach the same average kinetic energy.
The soda and soup molecules eventually reach the same total heat energy content.
The heat energy in the soup flows to the soda without stopping.
Only the average kinetic energy of the soup molecules changes.
A student puts a can of warm soda into a basin of cold water. Which of the following BEST describes the change in the average kinetic energy (KE) of the molecules in the soda and water and the direction of heat flow that occurs?
Average KE of Soda= Decreases, Average KE of water= Decreases, Heat Flow= Water to Soda
Average KE of Soda= Decreases, Average KE of water= Increases, Heat Flow= Soda to water
Average KE of Soda= Increases, Average KE of water= Decreases, Heat Flow= Water to Soda
Average KE of Soda= Increases, Average KE of water= Increases, Heat Flow= Water to Soda
If a glass of ice is left on a table in a warm room, it slowly melts. This is a result of which of the following?
the heat flowing from the surroundings into the glass of ice
the warm temperature of the surroundings flowing into the glass of ice
the heat of the ice and of the surroundings remaining constant
the cold temperature flowing out of the ice to the surroundings
In the reaction:
CaO(s) +H2O →Ca(OH)2(s) ΔH = –65.2kJ, which of the following is true?
The system loses 65.2kJ of energy to the surroundings.
The reaction is endothermic.
The energy content of the reactants is less than the energy content of the product.
Both B and C are true
When hydrocarbon is burned, or combusted, it forms water. During the process, energy is released in the form of heat. This kind of reaction is called
a(n) __________.
Water Forming
Nuclear
Endothermic
Exothermic
If total energy is conserved and an exothermic reaction means that energy flows from the system into the surroundings, then the energy gained by the surroundings must be __________.
more than the energy lost by the system
equal to the the energy lost by the system
less than the energy lost by the system
stopped at a certain level
With chemical systems, the universe is divided into two parts: the system and the __________.
structure
surroundings
classification
organism
Look at this thermochemical equation for a reaction between NH3 and HCl. NH3 + HCl → NH4Cl + 176 kJ
Which of the following best describes this reaction?
double displacement reaction
exothermic
endothermic
single replacement
In an endothermic chemical reaction
system absorbs energy as chemical bonds are formed
system releases energy as chemical bonds are broken
system absorbs energy from surroundings
system releases energy from surroundings
180 kJ + N2 + O2 → 2NO Which of the following statements regarding this reaction is TRUE?
This reaction releases thermal energy to the surroundings
The reactants have higher potential energy than the products
Thermal energy is destroyed as this reaction moves forward.
Potential energy of the products is greater than that of the reactants
When a liquid is heated to its boiling point, one of the reasons it begins changing to a gas is because
the particles begin to move faster and further apart.
gas releases energy to surroundings
liquid releases energy to surroundings
temperature of surroundings decreases
In an air conditioner, a working fluid is compressed from a gas state to a liquid state. This compression allows the fluid to do which of the following?
absorb electricity
release heat
reduce chemical energy
increase kinetic energy
An ice cube melts in a pan. While the ice cube melts, which interaction does it have with its environment?
The ice cube absorbs heat from its environment.
The ice cube releases oxygen and hydrogen into its environment.
The ice cube turns vapor in its environment into ice.
The ice cube adds to the kinetic energy of its environment.
One difference between evaporation and condensation is that
evaporation occurs at a higher temperature than condensation.
evaporation is endothermic, while condensation is exothermic.
evaporation releases energy, while condensation absorbs energy.
evaporation is a physical change, while condensation is a chemical change.
Which of the following represents a physical change that occurs when water releases energy?
water boiling
ice melting
water freezing
water evaporating
The amount of energy released or absorbed as heat during a chemical reaction is called ___________.
heat of reaction
temperature
entropy
energy
__________ allows you to calculate the enthalpy change for a reaction even when it cannot be measured directly.
Hess's Law
Addition Law
Gibb's Law
Marasco's Law
The equation for enthalpy is Δ(H) = H(products) – H(reactants). If a chemical interaction releases heat, Δ(H) is ___________.
zero
negative
endothermic
positive
∆t= 66
∆t=124
∆t=100
∆t=76
How many moles of ammonium are produced when 3 moles of nitrogen react with hydrogen?
C(s) + O2(g) -> CO2(g) ∆H=a
H2(g) + ½O2(g) -> H2O(l) ∆H=b
C4H9OH(l) + 6O2(g) -> 4CO2(g) + 5H2O(l) ∆H=c
What is the enthalpy change for the reaction shown below?
4C(g) + 5H2(l) + ½O2(g) -> C4H9OH(l)
What is the relationship between enthalpies p, q, r and s?
S(s) + H2(g) -> H2S(g) ∆H=p
H2(g) + ½O2(g) -> H2O(l) ∆H=q
S(s) + O2(g) -> SO2(g) ∆H=r
H2S(g) + 1½O2(g) -> H2O(l) + SO2(g) ∆H=s
p = q + r – s
p = s – q – r
p = q – r – s
p = s + r – q
You are given these two equations:
2H2 + O2 → 2H2O ∆H = -572 kJ
H2 + O2 → H2O2 ∆H = -188 kJ
When 1.0 mole of ZnO(s) decomposes,
ZnO(s) ---> Zn(s) + 1/2 O2(g) , enthalpy change is +348 kJ/mol.
What does this tell you about the formation of ZnO (s)?
the formation of ZnO (s) is endothermic
the formation of ZnO (s) is exothermic
the formation of ZnO (s) does not require energy
the formation of ZnO (s) absorbs heat.
2S + 3O2 → 2SO3
ΔH = -791.4 kJ
C + O2 → CO2
ΔH = -393.5 kJ
H2O (l) + 44.0 kJ --> H2O (g)
