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Elements, Compounds and Chemical Changes Review

Total questions: 43

Worksheet time: 43mins

Name
Class
Date
1.

Which of the following is not evidence of a new substance?

a)

temperature change

b)

liquid disappears when poured into another

c)

gas production

d)

solid formation

2.

Which of the following substances are elements?

a)

water

b)

salt

c)

carbon dioxide

d)

hydrogen

3.

How many elements are in this Carbon dioxide molecule?

a)

3

b)

2

c)

1

d)

0

4.

How many elements are in this potassium chloride (KClO3) molecule?

a)

3

b)

4

c)

5

d)

6

5.

What is true of both elements and compounds?

a)

They are always made of more than one element.

b)

They are large.

c)

They don't last long.

d)

They are considered to be pure substances.This is a correct answer

6.

If a solid is added to water and then a gas is given off, it is evidence of

a)

chemical change occurring

b)

a new product forming

c)

atoms rearranging

d)

all are true

7.

Evaporating, dissolving, & melting are all examples of

a)

elements

b)

compounds

c)

physical changes

d)

chemical reactions

8.

What is the chemical symbol of magnesium?

a)

12

b)

Mg

c)

Magnesium

d)

24.31

9.

Compounds are different than elements. Compounds are made of

a)

the same type of element.

b)

different types of elements.

10.

Which of the following shows evidence of a chemical reaction/change?

a)

Water being boiled and giving off STEAM.

b)

Sugar DISSOLVING into a liquid.

c)

Two liquids are mixed, and a solid FORMS.

11.

Which of the following observations tell you that a chemical reaction/change has occured?

a)

a solid becomes a liquid.

b)

a substance changes color.

c)

a solid dissolves into a liquid.

12.

Which of the following is shared in all chemical reactions/changes?

a)

They all produce a precipitate.

b)

They all show a color change.

c)

They all release energy.

d)

They all form new substances.

13.

How are elements different from compounds?

a)

an element is represented by a chemical formula and a compound is represented by a chemical symbol.

b)

an element is represented by a chemical symbol and a compound is represented by a chemical formula.

c)

Both an element and a compound are represented by a chemical symbol.

14.
What characteristic defines all chemical changes?
a)
There is a change of state.
b)
Electricity is produced.
c)
A new material is formed.
d)
Bubbles are produced. 
15.
Is "cutting wood" a chemical or physical change?
a)
Chemical change
b)
Physical change
16.
An example of matter made of only one element is
a)
water
b)
gold bar
c)
light bulb
d)
salad mixture
17.
Elements are represented by chemical symbol.  Symbols are written with
a)
all lower case letters
b)
all capital letters
c)
always only one  letter
d)
At least and ONLY one capital letter
18.
The smallest part of an element is
a)
proton
b)
atom
c)
compound
d)
mixture
19.
Which of the following statements are characteristics of an element?

I.   Made from a mixture
II.  a pure substance
III. represented by a symbol
IV. make up matter on Earth
a)
I,II
b)
I,IV
c)
II,IV
d)
II,III,IV
20.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
21.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
22.
Element is a
a)
pure substance
b)
compound
c)
mixture
d)
molecule
23.
How many elements are represented in the compound?
Na2CO3
a)
1
b)
2
c)
3
d)
4
24.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
25.
Salt water boils and the water completely evaporates, salt (NaCl) is left in the bottom of the beaker. Which of the following is left in the beaker?
a)
Compound
b)
Element
c)
Mixture
d)
None of the Above
26.
An element is made up of only one kind of _____.
a)
isotope
b)
plastic
c)
atom
d)
metal
27.
What is the picture displayed?
a)
atom
b)
element
c)
molecule
d)
compound
28.

Look at your periodic table, what are the chemical symbols for Gold and Copper?

a)

G & C

b)

Au & Cu

c)

Na & Cl

d)

Zn & Ga

29.

Which of the following is a chemical change?

a)

A rusted can

b)

A crushed can

c)

A chopped piece of wood

d)

Water evaporating

30.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
31.
Is hammering wood together to build a house a chemical or physical change?
a)
chemical
b)
physical
32.
What is the chemical symbol for the element Silicon
a)
S
b)
Si
c)
si
d)
Sl
33.
How many different elements are in this chemical formula: C2H2ClK3
a)
6
b)
8
c)
2
d)
4
34.
Is making orange juice a physical or chemical change?
a)
Physical 
b)
Chemical
35.
Is copper tarnishing a physical or chemical change?
a)
Physical 
b)
Chemical
36.
Is mold growing on cheese a physical or chemical change?
a)
Physical 
b)
Chemical
37.
Abbreviation for elements is called __.  Example:  Na, Fe, H
a)
symbol
b)
formula
c)
abbreviation
38.
Abbreviation for writing compounds.  For example:  NaCl, H2O, C12H22O11
a)
abbreviation
b)
symbol
c)
formula
39.
A change where the substance may change size, shape, color but still the SAME substance.
a)
physical change
b)
chemical change
c)
structural change
40.
A change where a new substance is produced.  Produces bubbles (a gas), bad smell (a gas), or black substance (precipitate)
a)
physical change
b)
chemical change
c)
structural change
41.

Which of the following is a compound:

a)

Carbon

b)

Water

c)

Oxygen

d)

Chlorine

42.

One way to tell how many elements a compound has is to..

a)

the the square root of the total number of lettersThis is a wrong answer the the square root of the total number of letters

b)

count the capital letters

c)

add up all the numbers

d)

count the letters

43.

The place where known elements are represented...

a)

The Period Table

b)

Compounds

c)

Chemical Formula

d)

Graph

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