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Chemistry Unit Test Review - 7th Grade Flashcards | StudBud
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Chemistry Unit Test Review - 7th Grade
Chemistry Unit Test Review - 7th Grade
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Questions
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Answers
1
A combination of chemical symbols and numbers to represent a substance.
Coefficient
Chemical Equation
Chemical Symbol
Chemical Formula
2
Identify "C"
Reactants
Subscript
Products
Coefficient
3
Negatively charged particle found outside of the nucleus of an atom.
Electron
Neutron
Proton
Positron
4
a property that can be observed or measured without changing the identity of the substance
Physical Change
Chemical Property
Chemical Change
Physical property
5
What is "4.003"
Atomic Mass
Atomic Number
Chemical Symbol
Chemical Formula
6
a property that can be observed or measured without changing the identity of the substance
Physical property
Chemical Change
Physical Change
Chemical Property
7
When a chemical reaction takes place in a closed system,
matter can enter, but not escape
matter cannot move at all
matter can neither enter nor escape to the surroundings
matter can enter or escape to the surroundings
8
Uses symbols and formulas to represent chemical reactions
Chemical Equation
Coefficient
Chemical Symbol
Chemical Formula
9
Which equation is balanced?
Fe+ Cl2 −−→ FeCl3
2Fe+ 3Cl2 −−→ 2FeCl3
Fe+ Cl2 −−→ 2FeCl3
Fe+ 3Cl2 −−→ FeCl3
10
Positively charged particle in the nucleus of an atom. Mass = 1 amu
Electron
Neutron
Positron
Proton
11
What is "He"
Chemical Formula
Chemical Symbol
Atomic Mass
Atomic Number
12
The only sure evidence for a chemical reaction is:
a color change
the production of one or more new substances
the formation of a gas
changes in properties
13
A solid that forms from solution during a chemical reaction is called a
precipitate
sludge
principal
chunks
14
What happens when chemical bonds break and new bonds form?
sublimination
matter is destroyed
a chemical change
a physical change
15
The 2 in 2KCl represents
subscript
Coefficient
valence electrons
superscript
16
Identify "B"
Products
Coefficient
Yields
Reactants
17
A chemical reaction that absorbs energy in the form of heat is described as
endothermic
exothermic
unbalanced
combustion
18
The process of ice changing into water is a
physical change
reaction
combustion
chemical change
19
Particle with no charge in the nucleus of an atom. Mass = 1 amu
Electron
Neutron
Positron
Proton
20
Every chemical reaction involves a change in
State
Concentration
Mass
Energy
21
What is the small "2" after hydrogen in 2H
2
O? 2H
2
O --> 2H
2
+ O
2
Coefficient
Subscript
Reactant
Product
22
What is the "2" before the H
2
O? 2H
2
O --> 2H
2
+ O
2
Subscript
Product
Coefficient
Reactant
23
Identify "E"
Subscript
Coefficient
Products
Reactants
24
Number of protons in the nucleus of an atom.
Atomic mass
Compound
Atomic number
Element
25
The number in front of a chemical formula
Reactant
Product
Coefficient
Subscript
26
Elements in horizontal rows that have the same number of energy levels/electron shells
Compound
Group/Family
Element
Period
27
A pure substance made of only one kind of atom
Compound
Group/Family
Atomic number
Element
28
A chemical reaction that releases energy in the form of heat is described as
unbalanced
endothermic
combustion
exothermic
29
What is "2FeCl
3
" in the equation: 2Fe+ 3Cl
2
−−→ 2FeCl
3
ions
the reactant
the solution
the product
30
Which equation is balanced?
2Fe+ O2 −−→ Fe2O3
2Fe+ 3O2 −−→ Fe2O3
4Fe+ 3O2 −−→ 2Fe2O3
Fe+ O2 −−→ Fe2O3
31
Every chemical reaction involves a change in
state
mass
energy
concentration
32
Symbols that show the elements in a compound and the ratio of atoms.
chemical equation
symbol
chemical formula
subscript
33
An atom or group of atoms that has become electrically charged.
Ion
Metal
Molecule
Nonmetal
34
A compound that consists of positive and negative ions, but has zero net charge.
Ionic bond
Ionic compound
Covalent Bond
Ion
35
What is "2H
2
O" in the equation: 2 H
2
+ O
2
--> 2H
2
O
the product
ions
the solution
the reactant
36
What are "2 H
2
+ O
2
" in the equation: 2 H
2
+ O
2
--> 2H
2
O
the product
the solution
ions
the reactant
37
A number in front of a chemical formula. 2H
2
O
Chemical Symbol
Coefficient
Subscript
Chemical Formula
38
Identify "A"
Products
Reactants
Subscript
Coefficient
39
a property that can be observed or measured without changing the identity of the substance
Chemical Property
Physical property
Chemical Change
Physical Change
40
What are "2Fe+ 3Cl
2
" in the equation: 2Fe+ 3Cl
2
−−→ 2FeCl
3
the product
ions
the reactant
the solution
41
Chemistry is
the study of matter and its changes.
anything that has mass and takes up space
combustion
the study of living things
42
Elements in vertical columns that have the same number of valence electrons, so have similar properties.
Group/Family
Period
Element
Compound
43
A change in which one or more substances combine or break apart to form new substances.
Polyatomic
Chemical Change
Physical Change
Reactant
44
When a chemical reaction takes place in an open system,
matter cannot move at all
matter can neither enter nor escape to the surroundings
matter can enter, but not escape
matter can enter or escape to the surroundings
45
A one or two letter representation of an element
Chemical Equation
Coefficient
Chemical Symbol
Chemical Formula
46
the force of attraction that holds two atoms together.
Polyatomic Ion
Chemical Bond
Glue
Molecule
47
Identify "D"
Reactants
Products
Subscript
Coefficient
48
The 2 in H
2
O represents
superscript
Coefficient
subscript
valence electrons
49
Which law states that during a chemical reaction, matter is not created or destroyed.
conservation of phase
conservation of energy
conservation of mass
conservation of magnitude
50
A shorter, easier way to show a chemical reaction, using symbols instead of words is called a
symbol
subscript
chemical equation
chemical formula
51
Identify "2"
Atomic Number
Chemical Symbol
Chemical Formula
Atomic Mass
52
Which equation is balanced?
N2 + H2 --> NH3
2N2 + 3H2 --> 2NH3
N2 + 3H2 --> NH3
N2 + 3H2 --> 2NH3
53
The principle of conservation of mass is true
only for reactions that take place in closed systems.
only for reactions that take place in open systems.
for no reactions at all.
for reactions in both open and closed systems.
54
The electrons that are in the highest energy level
Outside Electrons
Introverted Electrons
Valence Electrons
Balance Electrons
55
A representation of the valence electrons in an atom
Venn Diagram
Orbital Diagram
Electron Dot Diagram
Picture
56
When a chemical reaction takes place in an closed system
Utter chaos occurs
Matter can enter but not exit
Matter cannot enter nor exit
Matter can exit or enter
