Free Printable Ch-6

1.

Is this a physical or chemical change?

a)

Physical

b)

Chemical

2.

Which of the following observations would indicate a chemical change has happened? Select ALL correct answers.

a)

a solid precipitate forms

b)

heat energy is released

c)

breaks into smaller pieces

d)

folded in half

e)

a gas is produced

3.

In this example, what is the evidence a chemical change has occurred?

a)

volume is increased

b)

no energy is released

c)

gas is being released

d)

a precipitate has formed

4.

Bubbles form when water boils. Is this evidence of chemical change?

a)

Yes, because water is changing.

b)

Yes, because the water is reacting.

c)

No, because the vapor is still water.

d)

No, because water doesn't react with anything.

5.

Every chemical change involves a transfer of ______.

a)

mass

b)

volume

c)

density

d)

energy

6.

This is an example of _____ change.

a)

Physical

b)

Chemical

7.

Wood is chopped into small pieces. Then, it is burned to cook food. This is an example of a ____ change followed by a ____ change.

a)

chemical, physical

b)

physical, chemical

c)

physical, physical

d)

chemical, chemical

8.

True/False --- As this water freezes, the change in color means a chemical change has occurred.

a)

True

b)

False

9.

What type of change has occurred?

a)

Chemical

b)

Physical

10.

Is milk going sour a physical or chemical change?

a)

Physical

b)

Chemical

11.

Why is this a physical change?

a)

The shape of the clay has been changed.

b)

The clay can be put back into a ball shape instead of a birthday cake.

c)

The clays has not changed chemically.

d)

All are true

12.

An example of a physical property would be?

a)

Rust on a nail

b)

Salt dissolved in water.

c)

Wood burning

d)

An egg frying

13.

Which is NOT a physical change?

a)

Cutting a pizza into equal slices.

b)

Ice cubes melting back into liquid. water

c)

Baking cupcakes.

d)

A chocolate bar melting.

14.

Which one is not the characteristics of a physical change ?

a)

They are changes in the physical properties of substance.

b)

They are often irreversible

c)

Rearrangement of molecules take place

d)

No new substances are formed

15.

In physical change , the substance formed has different properties than the original substance.

a)

True

b)

False

16.

When a candle burns, both physical and chemical changes occurs.

a)

True

b)

False

17.

Insoluble impurities from solution during crystallization are removed by ____________

a)

Drying

b)

Filtration

c)

Heating

d)

Cooling

18.

Pure Copper Sulphate Crystals can be obtained by ________.

a)

Centrifugation

b)

Distillation

c)

Crystallisation

d)

Filtration

19.

What type of reaction is the following:
$2H_2+O_2->2H_2O$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

20.

What type of reaction is the following:
$BaCl_2+2KI\ ->\ 2KCl\ +\ BaI_2$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

21.

What type of reaction is the following:
$2NaHCO_3->\ Na_2CO_3+CO_2+H_2O$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

22.

What type of reaction is the following:
$Zn\ +\ 2HCl\ ->\ ZnCl_2+H_2$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

23.

What is the left part of a chemical equation called?
H_{2 +}O → H₂O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

24.

Which of the following is an example that includes evidence of a chemical reaction?

a)

A sample of zinc is placed in water and it settles to the bottom

b)

A solid block of ice is heated and it completely melts into a liquid.

c)

Sugar that is burned gives off an odor and turns brown and then black.

d)

A tomato is placed into a blender and chopped up into smaller pieces.

25.

Which of the following is NOT evidence that that a chemical reaction has occurred?

a)

produces light/heat

b)

production of a gas

c)

formation of a precipitate

d)

melting

Ch-6_VII

Total questions: 25

Worksheet time: 13mins

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