Free Printable Unit 3 Week 1 Review

1.

What evidence of chemical reaction is being shown in the picture?

a)

Formation of a precipitate

b)

Release of heat

c)

Formation of bubbles

d)

Change of color

2.

What evidence of a chemical reaction is being shown in the picture?

a)

Formation of a precipitate

b)

Release of heat

c)

Production of light

d)

Release of gas

3.

Which of the following statements is true regarding lighting a candle?

a)

Lighting a candle is a physical change because no new substances are formed

b)

Lighting a candle is a chemical change because heat and light are released

c)

Lighting a candle is a physical change because heat and light are produced

d)

Lighting a candle is a chemical change because new substances are formed

4.

What evidence of chemical change is being shown here?

a)

Change of color

b)

Formation of a precipitate

c)

Release of gas

d)

Release of heat

5.

Nylon is synthesized by mixing 2 liquids, what is the evidence that making nylon is a chemical change?

a)

Formation of a precipitate

b)

Release of gas

c)

Production of light

d)

Change in color

6.

Which of the following evidences is NOT present when dropping a gummy bear on molten KClO₃?

a)

Release of gas

b)

Production of light

c)

Release of heat

d)

Formation of a precipitate

7.

This picture shows the different stages of a reaction, choose the two main evidences of a chemical change

a)

Formation of a precipitate

b)

Change of color

c)

Release of gas

d)

Production of light

8.

Which of the following is NOT a chemical change?

a)

Digestion

b)

Rust

c)

Fermentation

d)

Distillation

9.

Which of the following is NOT an example of change of color as evidence of a chemical change?

a)

Water changes color as food coloring is added to it

b)

Fruit changes color as it rottens

c)

A goalkeep changes color as it rusts

d)

Leaves change color in autumn

10.

Which of the following is NOT an evidence of a chemical change?

a)

Change in temperature

b)

Expected change of color

c)

Formation of a precipitate

d)

Formation of bubbles

11.

A representation of a chemical species that includes the elements of what it is made of and how many of them

a)

Chemical formula

b)

Chemical equation

c)

Chemical change

d)

Chemical reaction

12.

Which of the following would NOT be classified as a chemical species?

a)

Sodium chloride

b)

Iron

c)

Phosphate ion

d)

Heat

13.

A species or condition that helps speed up a reaction

a)

Catalyst

b)

Reagent

c)

Product

d)

Substrate

14.

The species that participate and are changed during a chemical reaction

a)

Reagents

b)

Products

c)

Catalysts

d)

Yields

15.

Which of the following symbols is used to represent a precipitate in a chemical equation?

a)

(p)

b)

$\downarrow$

c)

$\uparrow$

d)

(s)

16.

Which of the following symbols is used to represent the release of a visible gas in a chemical equation?

a)

(g)

b)

$\downarrow$

c)

$\uparrow$

d)

$\because$

17.

Which of the following is NOT a characteristic of a chemical equation?

a)

It has a yield arrow that separates reagents and products

b)

Catalysts are written on top of the yield arrow

c)

Reagents are written on the right of the yield arrow

d)

It shows the physical states of the substances involved

18.

What does this symbol represent in a chemical equation?

\Delta

a)

Heat

b)

Release of light

c)

Empty space

d)

Pressure

19.

Read the following equation

CaCO_3\ \left(s\right)\longrightarrow\ CaO\left(s\right)+CO_2\left(g\right)

a)

Solid calcium carbonate breaks into solid calcium oxide and gaseous carbon dioxide in a reversible reaction

b)

Calcium carbonate solid breaks into calcium oxide solid and carbon dioxide gas in a reversible reaction

c)

Solid calcium carbonate breaks into solid calcium oxide and gaseous carbon dioxide in an irreversible reaction

d)

Calcium carbonate solid breaks into calcium oxide solid and carbon dioxide gas in an irreversible reaction

20.

What is the correct equation based on the following read?

Solid tetraphosphorous decoxide dissolves in liquid water to produce aqueous phosphoric acid.

a)

$P_4O_{10}\left(s\right)+H_2O\left(l\right)\rightarrow H_3PO_4\left(aq\right)$

b)

$P_4O_5\left(s\right)+H_2O\left(l\right)\rightarrow H_3PO_4\left(aq\right)$

c)

$P_2O_{10}\left(s\right)+H_2O\left(l\right)\rightarrow H_3PO_4\left(aq\right)$

21.

Which of the following symbols is used to represent a reversible reaction?

a)

$\rightarrow$

b)

$\leftrightarrow$

c)

$\Delta$

d)

$\phi$

22.

A reaction of MnO₂ requires heat to occur, what is heat in this scenario?

a)

A catalyst

b)

A reagent

c)

A product

d)

A yield

23.

Cadaverine is a foul-smelling diamine compound produced by the putrefaction of animal tissue. What is cadaverine in the reaction described in this scenario?

a)

A product

b)

A catalyst

c)

A reagent

d)

A substrate

24.

Read the following equation

S_8\left(s\right)+O_2\left(g\right)\rightarrow SO_2\uparrow

a)

Solid sulfur reacts with gaseous oxygen to release gaseous sulfur dioxide

b)

Solid sulfur reacts with solid oxygen to release gaseous sulfur dioxide

c)

Liquid sulfur reacts with gaseous oxygen to release gaseous sulfur dioxide

d)

Solid sulfur reacts with gaseous oxygen to release solid sulfur dioxide

Unit 3 Week 1 Review

Total questions: 24

Worksheet time: 12mins

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