1.4 Matter And The Scientific Method

2. All of the following are properties of tin. Which one is a chemical property of tin?

Tin can be hammered into a thin sheet.

At –40C a sheet of tin crumbles to a gray powder.

When a bar of tin is bent, it emits an audible “cry”.

Tin erodes when added to hydrochloric acid, and a clear gas forms.

malleabililty is physical
melting is physical
the tin is still tin when it "cries"
But when it reacts with HCl it forms new substances- that's physical

Explanation

malleabililty is physical
melting is physical
the tin is still tin when it "cries"
But when it reacts with HCl it forms new substances- that's physical

3. Choose the response that includes all the items listed below that are pure substances. 1. orange juice 2. steam 3. ocean water 4. oxygen 5. vegetable soup

1 only

2 4

1 3 4

4 only

there are numerous pure substance in orange juice, ocean water, and soup. However, steam is pure water, and oxygen is an element; both are pure.

Explanation

there are numerous pure substance in orange juice, ocean water, and soup. However, steam is pure water, and oxygen is an element; both are pure.

4. Which one of the following is an example of a physical property?

Dynamite explodes

Meat rots if it is not refrigerated

Gasoline burns

Ice floats on top of liquid water

A silver platter tarnishes

all are forming new substances except the ice floating- no chemical change there.

Explanation

all are forming new substances except the ice floating- no chemical change there.

5. A unifying principle that explains a body of facts and relations is referred to as

A hypothesis

A law

A theory

None of the above

scientists work their way up from clueless to a hypothesis , to a theory. then to a law, then they die. Just kidding.

Explanation

scientists work their way up from clueless to a hypothesis , to a theory. then to a law, then they die. Just kidding.

6. Which of the following is an example of a physical property?

Corrosiveness of sulfuric acid

Toxicity of cyanide

Flammability of gasoline

Neutralization of stomach acid with an antacid

Lead becomes a liquid when heated to 601C

when sulfuric acid corrodes something it turns it into something else- that's chemical
when cyanide is ingested it causes a chemical change in the patient
gasoline combines with oxygen to form carbon dioxide and water- a chemical change
stomach acid (hydrochloric acid) combines with a base to form salt and water- new substances are formed; this is a chemical change
when lead melts it simply becomes liquid lead; it is still lead; this is a physical change

Explanation

when sulfuric acid corrodes something it turns it into something else- that's chemical
when cyanide is ingested it causes a chemical change in the patient
gasoline combines with oxygen to form carbon dioxide and water- a chemical change
stomach acid (hydrochloric acid) combines with a base to form salt and water- new substances are formed; this is a chemical change
when lead melts it simply becomes liquid lead; it is still lead; this is a physical change