What is the combination of two or more atoms that act as a single unit called?
A molecule
100
What is the Law of Conservation of Energy?
Energy is neither created nor destroyed (it is transferred from one thing to another)
100
Describe the volume and shape of a liquid
Definite volume, no definite shape
100
What happens to the state of matter during condensation?
gas to liquid
100
What does the Law of Conservation of Mass state?
Mass can be neither created nor destroyed
200
What is the substance that CANNOT be broken down chemically into other substances?
Elements
200
The temperature of a balloon increases. What happens to the volume of the balloon?
The volume increases
200
What happens to the volume of an inflated balloon if it is left in cold air?
The volume decreases
200
What happens to the state of matter during evaporization?
liquid to gas
200
What do particles in a substance absorb/release to make a substance change phase?
Heat energy
300
What is unit of matter composed of two or more different atoms chemically bonded together?
Compound
300
Electric energy enters a blender. This energy is converted to other forms of energy. Which statement is true?
a. some of the electric energy is destroyed
b. the electric energy is completely destroyed
c. the electric energy is less than the converted forms of energy
d. the electric energy is less than the converted forms of energy
C. the electric energy is less than the converted forms of energy
300
Is energy released or absorbed when solid turns into liquid and liquid turns into solid?
Energy is absorbed
300
What happens to the state of matter during sublimation?
solid to gas
300
A bucket of water weighs 5 pounds. The water freezes and also weighs 5 pounds. True or false?
True
400
Why are coins usually made of metal?
a. Metals are expensive
b. Metals are malleable
c. Metals are dense
d. Metals conduct electricity
B
400
In which state of matter, are atoms moving the slowest?
Solid
400
Physical or chemical change? Sublimation, evaporization, freezing, deposition, melting, condensation...
Physical change
400
What happens to the state of matter during deposition?
gas to solid
400
Name two physical properties.
Melting point, boiling point, appearance, density
500
Classify each as an element or a compound (MUST GET ALL CORRECT!)
a. Sulfur, S
b. Methane, CH
c. Carbon monoxide, CO
d. Cobalt, Co
element, compound, compound, element
500
What is matter?
Anything with mass and volume
500
Physical change or chemical reaction? A precipate forms
Chemical reaction
500
What happens to a solid when it has reached its melting point?
becomes a liquid
500
An alka-seltzer tablet weighing 3 grams is added to an open flask of water (weighing 250 grams). At the end of the experiment, the flask weighs a total of 249.6 g. Explain why this experiment does not seem to follow the Law of Conservation of Mass.
Mass of products is not the same as mass of reactants