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Duplicate of Unit Test Review Chemistry
Duplicate of Unit Test Review Chemistry
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Review 7th grade chem unit
Flashcards
52 cards
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Practice quiz
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Questions
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Answers
1
Which of the following is a chemical reaction?
making hot cocoa
melting fat
boiling Kool Aid
baking cookies
2
Which choice below is an example of a physical change?
Adding baking soda to road salt
adding an oxygen molecule to water molecule
burning a candle
water changing from liquid to solid
3
Which of the following is a chemical reaction?
Painting a wall blue
Cutting paper
Ice melting
bicycle rusting
4
Choose the property that would help a scientist identify a substance.
mass
solubility
texture
volume
5
How is the atomic number of an element determined?
number of electrons
Number of protons
weight of one atom
Number of neutrons
6
Which choice below is not part of an atom?
positron
proton
electron
neutron
7
Which choice below is NOT a way to represent a chemical reaction?
chemical equation
number equation
word equation
molecular model
8
In a chemical reaction, the products are the starting substances.
True
False
9
Phase changes and mixtures are not chemical reactions.
True
False
10
Which of the following is an example of a chemical reaction in a closed system?
Alka-Seltzer in a beaker
Baggie with Road Salt and Baking Soda
Solubility of soap in water
Aluminum and Copper Chloride
11
In Science terms, something with mass and volume is called…
property
dense
matter
stuff
12
What is the main difference between physical and chemical properties?
physical properties cannot be reversed
chemical properties are measured using the 5 senses
chemical properties involve a chemical reaction
physical properties involve new substances
13
Which choice below is NOT an example of a chemical reaction?
a rusting nail
burning a match
cooking bacon
crushing a rock
14
14g Lithium + ___ g sulfur ---> 46g lithium sulfide
60 g
32 g
14 g
46 g
15
Which type of system exchanges energy and matter with the surroundings?
isolated
closed
open
16
When an ice cube melts, what do the molecules do?
spread farther apart
rearrange
disappear
break into smaller bits
17
Chemical reactions MUST occur within a few seconds or minutes.
true
false
18
What is the BEST reason why a mixture or phase change is NOT a chemical reaction?
The process is irreversible.
The atoms and molecules rearrange
The atoms and molecules do NOT rearrange.
The new substance has new properties.
19
Choose the best definition of a molecule.
a mixture of compounds and elements
single atoms of elements
a substance made entirely of one type of atom.
two or more atoms joined together
20
Which of the following is a chemical reaction?
baking cookies
boiling Kool Aid
making hot cocoa
melting fat
21
What Law states the mass of the reactants equals the mass of the products in a closed system?
The Law of Conservation of Energy
The Law of Conservation of Mass
The Law of Systems
The Law of Number of Atoms
22
Conservation of mass means the atoms in the reactants are ______ the atoms in the products.
greater than
equal to
less than
23
True or False: 50 grams of salt will be less soluble in water than 10 grams of salt.
True
False
24
What is the OBSERVED evidence that chemical reaction occurred in the Baking Soda/Road Salt lab?
The products had new properties
Heat was produced
Gas formed
Atoms rearranged
25
What is the Periodic Table?
Chemicals arranged by atomic mass
Molecules arranged alphabetically
Elements arranged by atomic number
All known compounds on Earth
26
What is a molecule that contains at least two different types of elements?
reactant
compound
precipitate
atom
27
Identify the product(s) in the chemical equation: 2Mg + O
2
→ 2MgO
O2
2Mg + O2
2MgO
2Mg
28
What is true about a balanced chemical equation?
Follows the Law of Conservation of Mass.
All of the above
The number and type of atoms are the same on both sides.
applies to a chemical reaction in a closed system
29
Which container was an example a totally closed system in the Alka Seltzer Lab?
None of the above
Film Cannister
Bottle
Beaker
30
Choose the best way to determine the physical properties of a substance.
Change the chemical identity of it.
Mix it with another chemical for a chemical reaction.
See if it explodes when fire is added to it.
Use your 5 senses to observe it.
31
Which of the following a physical reaction?
Lighting a match
Shattering glass with a baseball
Fireworks exploding
Corroding metal
32
Which choice below is NOT a sign of a definite chemical reaction?
change in properties
color change
atoms rearranging
new substance forming
33
What is something that contains more than one type of atom or molecule?
chemical
element
mixture
pure substance
34
What is the term for the basic building block of matter?
atom
element
compound
molecule
35
All chemical reactions have at least 2 starting substances and 2 or more ending substances.
false
true
36
What branch of science is the study of matter and how it interacts with other matter?
Matterology
Physics
Chemistry
Biology
37
Which choice below is an example of a chemical change?
water changing from liquid to solid
Crushing a can
Chocolate melting in the sun
adding an oxygen molecule to water molecule
38
Which 1 factor below is the LEAST likely to mean that a chemical reactions has occurred?
color change
the products have new properties
new substances are formed
atoms rearrange
39
Identify the product(s) in the electrolysis video.
Hydrogen and Water
Oxygen only
Water
Hydrogen and Oxygen
40
What is the BEST way to determine if a chemical reaction has occurred?
Compare the mass of the substance
Measure the volume of the new substance
See if the new substance has an odor
Test the properties of the new substance
41
Melting point is measured as the point when something _________________.
is in the middle of melting
finishes melting
starts to melt
is between the liquid and gas phase
42
Term for the substances that are made of one type of atom and that cannot be separated.
atom
element
molecule
compound
43
What does the atomic number of an element represent?
Number of neutrons
weight of one atom
Number of protons
Number of electrons
44
True or False: The mass of a substance does NOT affect it’s properties.
False
True
45
In a chemical reaction, you MUST have more than 1 reactant.
True
False
46
What is the formula for calculating density?
grams - volume
mass / volume
mass + volume
length x volume x width
47
What do atoms/molecules do during a chemical reaction?
rearrange
stay in the same place
stop moving
mutate
48
Substances have new properties after a chemical reaction bc existing chemical bonds are broken.
True
False
49
Why did the Kool-Aid/Lemonade lab demonstrate a mixture?
The products had different properties than the reactants.
Chemical bonds were broken and reformed.
Products had the same properties as the reactants.
Heating the lemonade caused a chemical reaction.
50
Which of the following is not a way to represent a chemical reaction?
Molecular Model
Number Equation
Word Equation
Chemical Equation
51
What is the term used to identify the starting substance(s) in a chemical reaction?
precipitates
reactants
oxidates
products
52
What does the Moh's scale measure?
density
hardness
solubility
mass
