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