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WorksheetsElements Notes Review
Total questions: 20
Worksheet time: 11mins
Name
Class
Date
1.
This word means "made in a laboratory."
a)
natural
b)
synthetic
2.
This is the smallest particle into which an element can be divided.
a)
compound
b)
atom
c)
mixture
3.
When different kinds of atoms chemically combine with each other in definite amounts/ratios to form something new.
a)
mixture
b)
element
c)
compound
4.
Two atoms of hydrogen and one atom of oxygen make(s) ______ molecule(s) of water.
a)
one
b)
two
c)
three
d)
four
5.
The smallest part of a compound that still acts like that compound is:
a)
element
b)
compound
c)
mixture
d)
molecule
6.
H2SO4 is composed of _________ elements.
a)
one
b)
two
c)
three
7.
The formula for caffeine is C8H10N4O2. How many hydrogen atoms are in one molecule of caffeine?
a)
8
b)
10
c)
2
8.
Products can include elements that were not found in the reactants.
a)
true
b)
false
9.
The substances that result from a chemical change are called this.
a)
reactants
b)
products
10.
When vinegar and baking soda react to produce carbon dioxide gas, the product is:
a)
water
b)
baking soda
c)
carbon dioxide
11.
This is the chemical reaction you did in one of the precipitate labs:
MgSO4 + 2N4OH => Mg(OH)2 + (NH4) SO4
On which side of the arrow are the reactants shown?
MgSO4 + 2N4OH => Mg(OH)2 + (NH4) SO4
On which side of the arrow are the reactants shown?
a)
right
b)
left
12.
Is this chemical equation balanced or not balanced?
SO2 + H2O => H2SO3
SO2 + H2O => H2SO3
a)
not balanced
b)
balanced
13.
The missing coefficient for this chemical equation to be balanced is:
N2 + ____ H2 => 2NH3
N2 + ____ H2 => 2NH3
a)
1
b)
2
c)
3
14.
A substance that can be separated by physical means.
a)
compound
b)
mixture
c)
atom
15.
The arrow in a chemical equation stands for
a)
yields
b)
reactants
c)
products
d)
this way
16.
A chart that organizes all the known elements according to their properties based on atomic number, weight, physical and chemical properties.
a)
elements chart
b)
atom organizer
c)
table of contents
d)
periodic table of elements
17.
An element cannot be broken down into __________ substances.
a)
simpler
b)
atomic
c)
more complex
18.
Is the below equation balanced or not balanced:
2 ZnS + O2 => 2 ZnO + 2 SO2
2 ZnS + O2 => 2 ZnO + 2 SO2
a)
not balanced
b)
balanced
19.
This picture represents a (a) .
Choose from the below words
element
compound
20.
H2O is a compound, pick the elements in this compound. (a) (b)
Choose from the below words
H
O
Ca
C
He
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