When iron combines with oxygen in a moist environment, rust forms because of a A.
change in density.
B.
chemical reaction.
C.
change in temperature.
D.
physical reaction.

Students performed an investigation on how aluminum cans taken to a recycle center were able to be reused. They found out an aluminum can undergoes which type of change?
A.
a physical change because the material remains the same
B.
a chemical change because new metal is formed
C.
a physical change because the can is heated
D.
a chemical change because an old can is changed into a new can

Which of the following is an example of a compound?
A.
carbon
B.
copper
C.
water
D.
iron

A student placed a small chip of limestone into a hydrochloric acid solution, and carbon dioxide gas was released. The carbon dioxide provided evidence that
A.
only a loss of mass occurred.
B.
only a physical change occurred.
C.
the formation of an element occurred.
D.
a chemical change occurred.

As part of a study, a scientist observed a number of different molecular changes in matter. Which of the following observations provides evidence of a physical change?
A.
a cake that was baked from many ingredients
B.
using heat to burn a log in a fireplace
C.
using light to produce sugar in plants
D.
a bottle that was broken into many small pieces

What is formed when a sodium atom and chlorine atom react chemically?
A.
an electron
B.
a neutron
C.
a compound
D.
an element

Which substance is composed of only one type of atom?
A.
salt
B.
water
C.
gold
D.
sugar

A mixture that has the same composition throughout is what kind of mixture?
A.
Taco Salad
B.
Heterogeneous
C.
Sharknado
D.
Homogeneous

John and Lisa collected a sample of ocean water and placed it in a jar. Within a couple of days, the water had evaporated and salt was visible at the bottom of the jar. This is an example of a
A.
solute being dissolved.
B.
chemical change.
C.
new substance being formed.
D.
physical change.

Which term correctly describes all of the following materials?

salt water, vinegar, bronze, air, beach sand

A.
solutions
B.
mixtures
C.
compounds
D.
elements

In which classification of matter are the components chemically combined?
A.
alloy
B.
compound
C.
mixture
D.
colloid

Since sodium chloride is classified as a compound, a sample of it contains
A.
matter that cannot be reduced to atoms.
B.
atoms that are gases, liquids, and solids.
C.
a solution of atoms and molecules.
D.
more than one kind of atom.

Which is the best example of a chemical change?

A.
paper tearing

B.
butter melting
C.
egg cooking

D.
water evaporating

Which is a physical change?
A.
rust forming on an iron fence
B.
a copper roof changing color
C.
a sheet of paper shredding
D.
a piece of wood burning

What is needed to change ice into water?
A.
stirring
B.
energy
C.
chemicals
D.
air

A group of students observed the formation of bubbles when water boiled. What happened to matter because of the physical change to the water?
A.
Matter was conserved when it changed form.
B.
New matter was created in the bubbles.
C.
Old matter was destroyed as the water turned to gas.
D.
The composition of the matter changed.

Which of the following results when hydrogen and chlorine chemically bond to form hydrogen chloride?
A.
a compound
B.
a solution
C.
a precipitate
D.
a mixture

What is the smallest unit of an element that still retains the element’s properties?
A.
an atom
B.
a crystal
C.
a molecule
D.
a proton

Which type of matter can be separated by physical means?
A.
compound
B.
element
C.
mixture
D.
atom

Which state has a definite shape and volume?

A.
Sharknado 2: The Second One
B.
Gas
C.
Solid
D.
Liquid