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WorksheetsPrep for Unit 3 Test
Total questions: 30
Worksheet time: 22mins
Name
Class
Date
1.
Is making salt water to gargle with a physical or chemical change?
a)
physical
b)
chemical
2.
An gel ice pack getting cold after you put it in the freezer for an hour.
a)
Chemical Change
b)
Physical Change
3.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
4.
Green bananas turning yellow on their own as they ripen.
a)
Chemical Change
b)
Physical Change
5.
Baking a cake by mixing flour, sugar, chocolate powder, eggs, and milk, and then heating them in the oven.
a)
Chemical Change
b)
Physical Change
6.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
sour milk
7.
A change in which NEW substances are formed.
a)
Chemical change
b)
Physical change
c)
Casual change
d)
Formal change
8.
Which of the following is NOT an example of chemical change?
a)
sour milk
b)
burning wood
c)
breaking a pencil
d)
rust
9.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
10.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
11.
In chemical reactions, the law of conservation of mass is......
a)
disobeyed
b)
not true
c)
obeyed
d)
used sometime
12.
Which one of these is a chemical property?
a)
melting point
b)
boiling point
c)
color
d)
flammability
13.
Which of the following is not a chemical property?
a)
rusting
b)
boiling
c)
rotting
d)
burning
14.
Which of the following is a chemical property?
a)
ability to rust
b)
ability to conduct heat
c)
volume
d)
magnetic
15.
Which of the following is a chemical property of water?
a)
Reacts with pure sodium
b)
Boils at 100 oC
c)
Is liquid at room temperature
d)
Has a density of 1 gm/mL
16.
Covalent bonds actually "share" electrons?
a)
true
b)
false
17.
Is hydrogen considered a metal or a non-metal?
a)
A metal
b)
Nonmetal
c)
Metalloid
18.
Covalent bonds are between...
a)
Metal and Non-metal
b)
Non-metal and Non-metal
c)
Metal and Metal
19.
What is a valence electron?
a)
The sum of neutrons and protons.
b)
The # of electrons in the last shell.
c)
A type of bond.
d)
A popular compound.
20.
Ionic bonds are between...
a)
Metal and Non-metal
b)
Non-metal and Non-metal
c)
Metal and Metal
21.
Two or more atoms held together by a chemical bond is called what?
a)
A molecule
b)
An element
c)
An ion
d)
An isotope
22.
What happens when an atom loses an electron?
a)
It becomes Negatively Charged
b)
It remains neutral because the proton also leaves.
c)
It becomes Positively Charged
d)
It stays the same.
23.
Carbon Dioxide is an example of covalent compound.
a)
True
b)
False
24.
Magnesium (Mg) and Oxygen (O) form an ________ bond.
a)
Ionic
b)
Covalent
c)
Metallic
d)
Nothing
25.
Nitrogen (N) is a ________.
a)
Metal
b)
Transition metal
c)
Non-metal
d)
Metalloid
26.
is this object acidic or base
a)
Acidic
b)
Base
c)
neither
d)
neutral
27.
Values from 0-14 that determine the acidity of a solution
a)
Molarity
b)
Electronegativity
c)
pH scale
d)
Solubility
28.
The pH of vinegar is 2.5. Vinegar is a _____________.
a)
strong acid
b)
strong base
c)
weak base
d)
weak acid
29.
A way to measure the concentration of hydrogen ions in a solution is to use a(n) _____.
a)
indicator
b)
litmus
c)
pH scale
d)
acid
30.
Ions that form when an acid interacts with water (H3O+).
a)
strong acid
b)
weak acid
c)
neutral solution
d)
Hydronium ions
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