Quiz about Chemistry STAAR Review

Question 1

Which of the following correctly identifies the number of each element involved in the chemical formulas? NH₄CO₃

Accepted Answer

Option D is correct

Answer

A.

Answer

B.

Answer

C.

Question 2

How many hydrogen atoms are in 4H₂O?

Accepted Answer

8

Answer

6

Answer

2

Answer

4

Question 3

Which is the correct formula for: three hydrogen (H), one sulfur (S), four oxygen (O)?

Accepted Answer

H3SO4

Answer

HSO4

Answer

H4S3O

Answer

H2O

Question 4

Is melting butter for popcorn a chemical or physical change?

Accepted Answer

physical

Answer

chemical

Question 5

Which of the following is an example of a chemical reaction?

Accepted Answer

A marshmallow turning black when heated over a fire

Answer

A powder dissolving in water to make lemonade

Answer

An ice cube melting into a puddle of water

Answer

Salt crystals being crushed into a powder

Question 6

What number indicates the nucleus?

Accepted Answer

4

Answer

1

Answer

2

Answer

3

Question 7

A horizontal row of elements in the periodic table

Accepted Answer

Period

Answer

Molecule

Answer

Family

Answer

Atom

Question 8

Elements in the same vertical column of the periodic table; also called group

Accepted Answer

Family

Answer

Atom

Answer

Element

Answer

Metals

Question 9

What is one way Neutrons are different from electrons?

Accepted Answer

neutrons have no charge, while electrons have a negative charge

Answer

they both are negative

Answer

Both are in the nucleus( center of atom)

Answer

Electrons are inside nucleus and neutrons are outside the nucleus.

Question 10

Which of the following correctly identifies the number of each element involved in the chemical formula $$C_6H_{12}O_6$$ ?

Accepted Answer

A) C: 6, H: 12, O: 6

Answer

B) C: 12, H: 6, O: 6

Answer

C) C: 6, H: 6, O: 12

Answer

D) C: 12, H: 12, O: 6

Question 11

What is the molar mass of water ( $$H_2O$$ )?

Accepted Answer

A) 18 g/mol

Answer

B) 16 g/mol

Answer

C) 20 g/mol

Answer

D) 22 g/mol

Question 12

Which of the following processes is an example of a chemical change?

Accepted Answer

C) Rusting of iron

Answer

A) Boiling water

Answer

B) Dissolving sugar in tea

Answer

D) Melting ice

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