Thermal Energy
As thermal energy is added to a substance, which of the following changes can be predicted?
A Vibrations of individual particles will increase.
B The spacing between the particles will decrease'
C The pressure of the substance will increase.
D The temperature of the substance will increase
A Vibrations of individual particles will increase
What type of matter has a definite volume but not definite shape?
A Solid
B Liquid
C Gas
B Liquid
Which of the following contribute to changes in particle motion or arrangement within a system? Pick 2
A Adding water
B Doubling the amount
C Increasing Temperature
D Decreasing pressure
Both C and D
A chemical Reaction in which heat is released
A Exothermic
B Endothermic
C Balanced
D Fantastic
A Exothermic
Which of the following represents reactions that release energy?
A burning a log at a campfire
B Activation of a cold pack
C Melting ice cubes
D The explosion of Fireworks
A burning a log at a campfire
D The explosion of Fireworks
To go from a solid to a liquid, what has to happen to the energy level?
A It must remain constant
B It has to be increased
C It has to be decreased
D The energy level has nothing to do with the state of matter.
B It has to be increased
If the student is looking at matter through a microscope and the atoms are all vibrating but remaining in the same relative positions, is it
A Solid
B Liquid
C Gas
D An interesting observation
A Solid
When heated is added to a full closed container of vapor. What will be the result to pressure? Pick two
A There will be no change in pressure.
B The vapor pressure will increase since the heat cause the particles to move faster and collide more.
C The vapor pressure will decrease, since the heat will cause the particles to slow.
D. The vapor pressure increases when heated because the gas inside expands taking up more space
B and D
A substance produced during a chemical reaction is called?
A Reactant
B Product
C Potassium
D The periodic table
B Product
If energy in the system decreases is it endothermic or exothermic?
Exothermic
A Chemical Reaction in which heat is absorbed is called?
A Exothermic
B Endothermic
C Balanced
D Fantastic
B Endothermic
What do we call the phase change from a gas to a liquid?
A Sublimation
B Vaporization
C Freezing
D Condensation
D Condensation
When a closed container full of hot vapor is placed in ice water, the container will collapse. Why?
A Heat mad the container weak, so it got crushed when place in cold water.
B The water vapor expanded when heated then contracted when cooled, creating a vacuum.
C the cold water caused the can to break apart from sudden change in heat.
D The cold water increased pressure inside forcing the can to shrink inward when cooled.
B The water vapor expanded when heated then contracted when cooled, creating a vacuum.
The total kinetic (motion) energy in the tiny particles that make up matter: the faster particles move, the warmer matter becomes is called
Thermal Energy
Two chemicals are combined in a beaker, and they react. What data would provide the best evidence for determining if the reaction absorbed or released thermal energy?
A The temperature inside the beaker before and after the reaction
B the masses of the substances before and after the reaction
C How long it took for the reaction to take place once the chemicals were combined
D Whether light and sound were produced during the reaction.
A The temperature inside the beaker before and after the reaction
Photosynthesis is an example of what type of reaction?
A Exothermic
B Endothermic
C Balanced
D Worthless
B Endothermic
C Balanced
Which of the following changes to a sample of liquid would result in an increase in the distance between the individual molecules of the substance?
A Changing the phase of matter from Liquid to solid.
B Transferring the substance to a smaller container
C Adding heat energy to the surface
Decreasing the overall kinetic energy of the liquid.
C Adding heat energy to the surface.
The process by which one or more substances change to produce one or more different substances is called?
A Matter manipulation
B Magic
C Chemical Reaction
D Products
C Chemical Reaction
The simplest unit of a chemical compound that can exist, formed when two or more atoms join together chemically is called?
A molecule.
When exothermic reactions occur where does the energy come from?
From the energy stored in chemical bonds
Cooking and egg is an example of what type of reaction
A Exothermic
B Endothermic
C Balanced
D Domestic
B Endothermic
What do we call the phase change from solid to a gas?
A Sublimation
B Vaporization
C Freezing
D Condensation
A Sublimation
Does this equation fulfill the Law of Conservation of mass?
2K + 2H2O = 2KOH + H2
Yes
A state of matter with indefinite volume and shape.
Gas
When endothermic reactions occur where does the energy come from?
They absorb energy from the surroundings.