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Worksheets

Physical & Chemical Reactions

Total questions: 40

Worksheet time: 36mins

Name
Class
Date
1.

A scientist is examining an unknown solid. Which procedure would most likely help determine a chemical property of the substance?

a)

heating it to find the temperature at which it melts

b)

exposing it to a flame to see if it catches on fire

c)

hitting it with a hammer to determine if it breaks or bends

d)

placing it in water to find out whether or not it dissolves

2.

Which statement best describes what happens during a chemical change?

a)

Both the identity and the properties of a substance change.

b)

Some properties of a substance change, but its identity remains the same.

c)

The chemical properties of a substance change, but its physical properties remain the same.

d)

The physical properties of a substance change, but its chemical properties remain the same.

3.

Which event always involves a chemical change?

a)

boiling

b)

melting

c)

conducting

d)

burning

4.

Making a pancake from batter is an example of a ___________ change.

a)

chemical

b)

physical

5.

Which statement describes all chemical changes, but not all physical changes?

a)

Bubbles are produced.

b)

A new substance forms.

c)

Phase changes occur.

d)

A color change occurs.

6.

Which is an example of a chemical change?

a)

frying an egg

b)

boiling water

c)

melting butter

d)

chopping onions

7.

Which laboratory activities involve chemical changes?

a)

leaving a copper penny in vinegar until it turns green

b)

boiling saltwater for several minutes until only solid salt remains

c)

extracting iron filings from a sand mixture using a magnet

d)

crushing a rock with a hammer to extract mineral deposits

8.

Flammability is the ability of a substance to _________

a)

Burn

b)

Transfer heat

c)

Transfer electricity

d)

Cook

9.

Choose the one that is a chemical property

a)

Magnetism

b)

Size

c)

Color

d)

Reactivity with water

10.

Choose the 3 that are physical properties of aluminum foil

a)

Malleable

b)

Luster

c)

Oxidation

d)

High melting point

11.

What effect does observing the physical properties of a substance have on the substance?

a)

Measuring physical properties changes the chemical identity of the substance

b)

Observing physical properties has no effect on the substance

c)

It makes to substance develop a deep seeded distrust of humans

d)

The substance will undergo an exothermic reaction

12.

Which of the following statements is accurate?

a)

After observing a chemical property, the substance remains the same as before

b)

All metals have the same physical properties

c)

When you see water turn into steam, you have observed a chemical property

d)

A physical property can change without causing a change in the chemical identity of the substance

13.

What is the outcome of observing a chemical property?

a)

Nothing

b)

A new substance is formed with different properties

c)

NaCl

d)

A rise in thermal conductivity

14.

Choose whether the following is a physical or chemical property: Malleability

a)

Physical

b)

Chemical

15.

Choose whether the following is a physical or chemical property: Reacts with oxygen

a)

Physical

b)

Chemical

16.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
17.
a substance that is formed as the result of a chemical reaction
a)
Product 
b)
Reactant
c)
Starters
d)
Enders
18.
a substance formed when two or more elements are chemically bonded together
a)
Element Soup
b)
Pure Element
c)
Ion
d)
Compound
19.
tells us the number of atoms of each element in a compound
a)
Coeffecient
b)
Exponent
c)
Chemical Formula
d)
Calculator
20.
the symbolic representation of a chemical reaction
a)
Long Hand
b)
Short Hand
c)
Electron Configuration
d)
Chemical Equation
21.
a process or reaction in which the system absorbs energy from its surroundings; usually, but not always, in the form of heat
a)
Endothermic Reaction
b)
Exothermic Reaction
c)
Diffusion
d)
Fission
22.
a chemical reaction that releases energy by light or heat
a)
Endothermic Reaction
b)
Exothermic Reaction
c)
Diffusion
d)
Fission
23.
type of chemical reaction where an element reacts with a compound and takes the place of another element in that compound
a)
Double Displacement
b)
Single Displacement
c)
Synthesis
d)
Decomposition
24.
type of reaction in which two or more elements combine to form a more complex compound
a)
Double Displacement
b)
Single Displacement
c)
Synthesis
d)
Decomposition
25.
type of reaction in which a compound is broken down into its simple elements
a)
Double Displacement
b)
Single Displacement
c)
Synthesis
d)
Decomposition
26.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
27.

Which equation is balanced?

a)

PbO2 + 2H2

b)

SO2 + H20 --> H2SO4

c)

2Na + 2H2O --> 2NaOH + H2

28.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
29.

What law governs the balancing of chemical equations?

a)

Law of Energy

b)

Law of Conservation of Matter/Mass

c)

Law of Gravity

d)

Law of Matter Movement

30.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
31.

What are the coefficients that would properly balance this equation?

__Ca + __H2O --> __Ca(OH)2 + __H2

a)

2,1 --> 2,1

b)

1,2 --> 1,1

c)

1,2 --> 2,4

d)

1,2 --> 2,1

32.

What are the coefficients that would properly balance this equation?

__H2 + __S --> __H2S

a)

1,1 --> 1

b)

2,2 --> 2

c)

1,2 --> 1

d)

1,2 --> 2

33.

Chemical Reaction

a)

a substance formed as a result of a chemical reaction

b)

a change in matter that produces one or more new substances

c)

the process in which substances undergo chemical changes that result in the formation of new substances

d)

a substance that enters into a chemical reaction

34.

The Law of Conservation of Matter

a)

tells how many atoms of an element are contained in one molecule or formula unit.

b)

the starting materials in a chemical reaction

c)

the new substances that are formed in a chemical reaction

d)

A law stating that atoms are not created or destroyed during a chemical reaction.

35.

The coefficient in 3H2O is

a)

6

b)

5

c)

2

d)

3

36.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
37.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
38.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
39.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
40.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number in front of a chemical formula.
c)
The number in between the chemical symbols.
d)
The number behind a chemical formula.

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