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Unit Test Review Chemistry - SCMS2020 Flashcards | StudBud
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Unit Test Review Chemistry - SCMS2020
Unit Test Review Chemistry - SCMS2020
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Review 7th grade chem unit
Flashcards
39 cards
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Practice quiz
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Questions
39
Answers
1
Which of the following is not a way to represent a chemical reaction?
Word Equation
Chemical Equation
Molecular Model
Number Equation
2
What is the BEST reason why a mixture or phase change is NOT a chemical reaction?
The process is irreversible.
The new substance has new properties.
The atoms and molecules rearrange
The substance stays the same throughout.
3
Choose the best definition of a molecule.
a substance made entirely of one type of atom.
single atoms of elements
a mixture of compounds and elements
two or more of the same atoms joined together
4
In a chemical reaction, the products are the starting substances.
True
False
5
Which choice below is NOT a sign of a definite chemical reaction?
new substance forming
atoms rearranging
shape change
change in properties
6
How is the atomic number of an element determined?
weight of one atom
number of electrons
Number of protons
Number of neutrons
7
What is true about a balanced chemical equation?
All of the above
applies to a chemical reaction.
Follows the Law of Conservation of Mass.
The number and type of atoms are the same on both sides.
8
What is the Periodic Table?
Elements arranged by atomic number
All known compounds on Earth
Chemicals arranged by atomic mass
Molecules arranged alphabetically
9
Which of the following is a chemical reaction?
melting fat
baking cookies
making hot cocoa
boiling Kool Aid
10
True or False: The mass of a substance does NOT affect it’s properties.
True
False
11
Identify the product(s) in the chemical equation: 2Mg + O
2
→ 2MgO
2Mg + O2
O2
2Mg
2MgO
12
Which of the following is a chemical reaction?
melting fat
making hot cocoa
baking cookies
boiling Kool Aid
13
Which of the following is a chemical reaction?
bicycle rusting
Painting a wall blue
Ice melting
Cutting paper
14
In Science terms, something with mass and volume is called…
dense
matter
property
stuff
15
Conservation of mass means the atoms in the reactants are ______ the atoms in the products.
less than
equal to
greater than
16
What is a molecule that contains at least two different types of elements?
atom
compound
precipitate
reactant
17
Choose the best way to determine the physical properties of a substance.
See if it explodes when fire is added to it.
Change the chemical identity of it.
Mix it with another chemical for a chemical reaction.
Use your 5 senses to observe it.
18
What does the atomic number of an element represent?
Number of electrons
weight of one atom
Number of protons
Number of neutrons
19
Phase changes are not chemical reactions.
True
False
20
Which 1 factor below is the LEAST likely to mean that a chemical reactions has occurred?
new substances are formed
atoms rearrange
shape change
the products have new properties
21
Chemical reactions MUST occur within a few seconds or minutes.
false
true
22
What branch of science is the study of matter and how it interacts with other matter?
Physics
Biology
Matterology
Chemistry
23
Which choice below is an example of a chemical change?
wood burning
Chocolate melting in the sun
Crushing a can
water changing from liquid to solid
24
Which choice below is NOT an example of a chemical reaction?
burning a match
a rusting nail
crushing a rock
cooking bacon
25
What Law states the mass of the reactants MUST equal the mass of the products?
The Law of Number of Atoms
The Law of Conservation of Mass
The Law of Conservation of Energy
The Law of Systems
26
What is the term used to identify the starting substance(s) in a chemical reaction?
reactants
products
precipitates
oxidates
27
What is something that contains more than one type of atom or molecule?
element
mixture
pure substance
chemical
28
When an ice cube melts, what do the molecules do?
rearrange
disappear
break into smaller bits
spread farther apart
29
14g Lithium + ___ g sulfur ---> 46g lithium sulfide
46 g
14 g
60 g
32 g
30
Substances have new properties after a chemical reaction bc existing chemical bonds are broken.
True
False
31
Melting point is measured as the point when something _________________.
is in the middle of melting
starts to melt
finishes melting
is between the liquid and gas phase
32
What is the main difference between physical and chemical properties?
physical properties cannot be reversed
chemical properties involve a chemical reaction
physical properties involve new substances
chemical properties are measured using the 5 senses
33
Which of the following is a physical change?
Shattering glass with a baseball
Lighting a match
Corroding metal
Fireworks exploding
34
Which choice below is not part of an atom?
positron
electron
neutron
proton
35
Which choice below is NOT a way to represent a chemical reaction?
molecular model
word equation
number equation
chemical equation
36
Which choice below is an example of a physical change?
Adding baking soda to road salt
water changing from liquid to solid
burning a candle
adding an oxygen molecule to water molecule
37
What is the term for the basic building block of matter?
molecule
compound
atom
element
38
What do atoms/molecules do during a chemical reaction?
rearrange
stop moving
stay in the same place
mutate
39
Term for the substances that are made of one type of atom and that cannot be separated.
atom
element
compound
molecule
