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Science chemistry

Total questions: 23

Worksheet time: 12mins

Name
Class
Date
1.
Define Reactants
a)
the building block of matter
b)
a description of a reaction
c)
the substances produced in a reaction
d)
the starting substances in a chemical reaction
2.
Explain why subscripts cannot change when balancing a chemical equation
a)
Gives the amount of atoms
b)
You can change subscripts
c)
The identity of a substance changes
d)
None of the above
3.
Define products
a)
The substance produced in a chemical reaction
b)
Another word for ions
c)
A description of a reaction
d)
Process in which atoms bond together
4.
Which of these are signs that a chemical reaction has occurred?
a)
Change in color 
b)
Release of light
c)
Change in odor
d)
All are correct
5.
What is a chemical reaction?
a)
produces or yields
b)
an attraction between atoms
c)
a process in which one or more substances rearrange to form a new one
d)
state that the identity stays the same before and after 
6.
What is a chemical reaction?
a)
produces or yields
b)
an attraction between atoms
c)
a process in which one or more substances rearrange to form a new one
d)
state that the identity stays the same before and after 
7.
A chemical equation is a description of a reaction using symbols
a)
TRUE
b)
FALSE
8.
Atoms separate, rearrange, and new bonds form in a chemical reaction
a)
FALSE
b)
TRUE
9.
What is a coefficient?
a)
Number of protons of that substance in a reaction
b)
Number of electrons of that substance in the reaction
c)
Number of units of that substance in the reaction
d)
Number of metallic bonds
10.
The law of conservation of mass states that the total mass of  the reactants and the products before and after in a chemical reaction will not be the same
a)
TRUE
b)
FALSE
11.
Which of these is NOT a step in balancing a chemical equation
a)
Add or change subscripts
b)
Add coefficients 
c)
Write the unbalanced equation 
d)
Count atoms of each element in the reactants and in the products
12.
What is the correct form to balance this equation:
H2 + O2 --> H2O
a)
4H2 + O2 --> H2O
b)
2H2 + O2 --> 2H2O
c)
2H2 + 2O2 --> 4H2O
d)
5H2 + 2O2 --> 10H2O
13.

A huge snow storm is happening, therefore school will be cancelled tomorrow

a)

Observation

b)

Inference

c)

I don't know

d)

Kiwi

14.

Which of the following is NOT a part of the scientific method

a)

Hypothesis

b)

Observation

c)

Educated guess

d)

Solubility

15.

The desk is blue and 500 cm

a)

Qualitative

b)

Quantitative

c)

Both

d)

Peanut

16.

Something that is very viscous is...

a)

Thiccc

b)

Thick

c)

A solid

d)

A gas

17.

An atom is made up of one singular particle

a)

True

b)

False

c)

Not sure

d)

Strewberry

18.

ChLNo is a...

a)

compound

b)

element

c)

Atom

d)

sub atomic particle

19.

all elements with white lettering in the periodic table are

a)

Gasses

b)

Pure substances

c)

Solids

d)

elements that react to each other

20.

Particle theory says

a)

All matter is made up of elements

b)

All matter is made up of particles, in constant motion

c)

All matter is made up of particles, that do not move

d)

All matter is made up of particles, that begin to move when heat is added

21.

H2O is...

a)

2 parts hydrogen 1 part oxygen

b)

2 parts hydrogen 2 parts oxygen

c)

2 parts hydrogen 0 parts oxygen

d)

2 parts hydrogen 1 part aluminium

22.

Mr. Hanna left early again, he must be going to a game

a)

Observation

b)

Inference

23.

This quiz was...

a)

Great

b)

Fantastic

c)

Amazing

d)

Exceptional

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