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WorksheetsChemistry Test Review
Total questions: 24
Worksheet time: 19mins
Why does this balloon expand in size?
When you decrease the temperature of the air inside the balloon, the balloon expands in size
When you increase the temperature of the air inside the balloon, the balloon expands in size
The pressure increased inside the balloon causing it to expand in size
The pressure decreased inside the balloon causing it to expand in size
A balloon is moved from a warm room, to a refrigerator. Why would the balloon decrease or shrink in size?
Due to a decrease in the number of particles, the balloon also decreased in size (volume)
Due to the temperature decreasing, the mass of the balloon decreased
The pressure on the outside of the balloon increased due to a decrease in temperature
Pressure inside the balloon decreased because the motion of the particles slowed down.
When a balloon is cooled, it causes the effect seen in the picture. When temperature decreases, what is effected?
the chemical energy of the balloon
the mass of the gas inside the balloon
the potential energy of the balloon
the kinetic energy of the balloon
You have a party and accidentally release a helium balloon into the air. As the balloon rises higher and higher into the atmosphere you watch it burst. What caused the balloon to burst?
An increase in the mass of the helium gas
An increase in volume of helium gas
An increase in the density of helium gas
An increase in temperature of the helium gas
According to Charles’ Gas Law, as volume increases and pressure is constant, the temperature will
increase
decrease
stay the same
increase then decrease
Pressure is caused by the collisions between molecules within a closed container. Why would tires lose pressure in a car?
The collisions of molecules increase
The collisions of molecules decrease
The molecules move more randomly when pressure increases
The molecules constantly change motion and become unstable
Why would the gas molecules mix when the valve opens between the two containers?
Gases move randomly and fill both containers
Electrical field attracts the atoms of the gases to each other
Temperature changes causes gases to move and expand into the two containers
Gravity pulls the gas atoms towards each container
What kind of reaction occurs when burning wood?
the wood absorbs head and is endothermic
The wood releases heat and is exothermic
The wood releases heat and is endothermic
The wood absorbs heat and is exothermic
A student placed two chemicals into a bag and determined the reaction was endothermic. What evidence would support this statement?
The bag got warmer
The bag got cooler
The bag changed colors
Bubbles formed
A student placed two chemicals into a bag and determined the reaction was exothermic. What evidence would support this statement?
The bag got warmer
The bag got cooler
The bag changed colors
Bubbles were produced
Use the heat equation to solve the following:
123 grams of water was heated at an initial temperature of 20 degrees Celsius to 27 degrees Celsius. The specific heat of water is 4.18 J/g x C. Calculate the heat flow.
3560 Joules
3000 Joules
1500 Joules
300 Joules
During a calorimetry experiment, a 2 gram piece of metal changes the temperature of 500 grams of water from 20 degrees Celsius to 45 degrees Celsius. The specific heat of water is 4.18 J/ g x C. Calculate the heat flow.
50,000 Joules
200 Joules
5000 Joules
2000 Joules
What happens to the total amount of energy when it is converted to one form to another?
energy is created so it is increased
energy is destroyed so it decreases
remains the same since energy cannot be created or destroyed
energy constantly changes throughout the conversion
A piece of metal is placed into a sample of boiling water. After being in the water for a few minutes, you remove the piece of metal. After some time, the metal can be touched without burning your hands, but the water is still too hot to touch. Why?
Water has low specific heat and cools off slowly
Metal has low specific heat and cools off quickly
The glass beaker is a good conductor
Water loses heat to the air very quickly and cools off fast
You get out of a pool on a hot summer day and lay out to air dry on a chair. What causes the water droplets to evaporate from your skin?
Heat energy from your skin is transferred to the water droplets causing them to evaporate
Heat energy from the water droplets is transferred to your skin causing the water to evaporate
Hydrogen bonds between the water molecules break and are released into the air
The covalent bonds between the water molecules break and are released into the air
What part is missing from this equation?
3 carbon dioxide molecules
12 carbon atoms
12 oxygen atoms
6 oxygen atoms
What law is being demonstrated?
Law of conservation of mass
Law of conservation of energy
law of kinetic theory
law of gravity
During chemical reactions, how does the law of conservation of mass apply?
The reactants and products have the same atoms
The reactants and products have the same molecules
Change in matter is equal to change in energy
The change in matter is a small percentage of the total mass
Who would heat the fastest?
Liquid water
Copper
Lead
Granite
What is a calorimeter used for?
measure mass
measure specific heat
measure temperature
measure volume
How does a temperature change effect the mass of products in a reaction?
It destroys the mass, decreasing it
It creates mass, increasing it
The mass of the products are the same as the mass of reactants
Total mass decreases because volume decreases
If the empirical formula for a substance is HO, what would the molecular formula be if the molecular mass is 51 grams
H2O2
HO
H3O3
H5O5
What is the mass of 1 mole of Calcium?
15.999 grams
1.008 grams
40.078 grams
14.007 grams
If you have 4 moles of Carbon-12 what is it's mass?
12 grams
36 grams
3 grams
48 grams
