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ECM, Ch. and Physical Changes, & Counting elements and Atoms

Total questions: 30

Worksheet time: 19mins

Name
Class
Date
1.

What is a substance made of two or more elements that are chemically combined called?

a)

A. element

b)

B. compound

c)

C. mixture

d)

D. solution

2.

Is salt (NaCI) a compound or an element?

a)

Compound

b)

element

3.

A substance that cannot be broken down into any other substance by ordinary chemical means is called

a)

a molecule.

b)

a mixture.

c)

an element.

d)

a compound.

4.

Matter is anything that has mass and takes up space.

a)

true

b)

false

5.
Can a mixture be separated? 
a)
No
b)
Yes
c)
Only sometimes
6.
A pure substance...
a)
is an element or a compound
b)
is an element or a mixture
c)
is a compound or a mixture
d)
is a mixture
7.

Which of these is an element?

a)

Salt (NaCl)

b)

Water (H20)

c)

Oxygen (O)

d)

Carbon Dioxide (CO2)

8.

Which of these is a compound?

a)

Aluminium (Al)

b)

Carbon Dioxide (CO2)

c)

Nitrogen (N)

d)

Sand

9.
Wood burned in a fireplace
a)
Chemical Change
b)
Physical Change
10.
Ice melting
a)
Chemical Change
b)
Physical Change
11.
Baking soda and vinegar combine to make carbon dioxide
a)
Chemical Change
b)
Physical Change
12.
Glass bottle that is shattered
a)
Chemical Change
b)
Physical Change
13.
Rust on an iron fence
a)
Chemical Change
b)
Physical Change
14.
Shredding a piece of paper
a)
Chemical Change
b)
Physical Change
15.
What happens in ALL chemical changes?
a)
Change in state of matter
b)
A new substance is formed
c)
Bubbles are produced
d)
An explosion
16.

What happens in a physical change?

a)

The atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants. When a new substance is formed.

b)

When objects or substances undergo a change that does not change into a different substance.

17.
Iron rusts.
a)
Chemical change
b)
Physical Change
18.

Which are clues that a chemical change has taken place?

a)

Change in temperature

b)

The color changes

c)

The odor or smell changes

d)

Formation of a precipatate

e)

You see bubbles form

19.

Select the properties of a physical change!

a)

Color

b)

Shape

c)

Size

d)

Bubbles

e)

Temperature

20.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
21.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
22.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
23.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
24.
A subscript is the small number below a(n) ________ that tells the number of _______ of that element.
a)
element symbol; atoms
b)
atom; element symbol
c)
subscript; protons
d)
compound; elements
25.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
26.

HCl has how many atoms of each element?

a)

H=1, Cl=1

b)

H=2, Cl=2

c)

H=3, Cl=1

27.

The first letter of an element is always ...

a)

a lowercase letter

b)

a uppercase letter

c)

a number

d)

the letter H

28.

How many atoms are in this chemical formula: (NH4)2SO4

a)

12

b)

15

c)

4

d)

10

29.

How many atoms are in this formula: Zn(NO3)2

a)

3

b)

5

c)

9

d)

7

30.

How many Hydrogen atoms in 3(NH₄)₂CrO₄?

a)

4

b)

2

c)

8

d)

24

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