Question

question #3
a student adds 100 ml of water to three similar containers (1, 2, and 3) made of different materials and places the containers outside for two weeks. the student observes that no changes occur in container 1, but rust forms in containers 2 and 3.
what can likely be inferred about the nature of the containers?
a containers 1, 2, and 3 are made of metals because no changes occur to any of the containers.
b containers 1, 2, and 3 are made of non - metals because no changes occur to any of the containers.
c container 1 is made of a nonmetal, and containers 2 and 3 are made of metals because the chemical properties of those containers change.
d container 1 is made of a metal, and containers 2 and 3 are made of nonmetals because the chemical properties of those containers change.
question #4
while cooking dinner, a student places a pot full of water on the stove to heat up. the student notices that small bubbles start to appear at the bottom of the pot after three minutes.
what type of property of water is the student observing?
a a chemical property because the water is changing to steam.
b a chemical property because the water is reacting with the pot.
c a physical property because the water is changing to steam.
d a physical property because the water is reacting with the pot.
question #5
which is a chemical property?
a boiling
b burning
c freezing
d melting

Explanation:

Question #3

Rust formation is a chemical reaction typical of metals. Since rust forms in containers 2 and 3 but not in 1, container 1 is likely a non - metal and 2 and 3 are metals as their chemical properties change (rusting).

Question #4

When water changes to steam upon heating, it is a physical change as the chemical composition of water ($H_2O$) remains the same. So it is a physical property.

Question #5

Burning involves a chemical reaction where a substance reacts with oxygen to form new substances. Boiling, freezing, and melting are physical changes where the substance's chemical composition doesn't change.

Answer:

Question #3: C. Container 1 is made of a nonmetal, and containers 2 and 3 are made of metals because the chemical properties of those containers change
Question #4: C. A physical property because the water is changing to steam
Question #5: B. burning