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Chemical Reactions Flashcards | StudBud
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Chemical Reactions
Chemical Reactions
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#8thgrade #physicalscience #chemicalreactions
Flashcards
44 cards
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Practice quiz
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Questions
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Answers
1
particles in solids are __________.
all over
closely packed
surround the nucleus
loosely packed
2
NaBr + Ca(OH)
2
-> CaBr
2
+ NaOH is what type of Chemical reaction?
Combustion
Double-Replacement
Synthesis
Decomposition
3
What is the chemical symbol for Sodium
Na
O
S
Mg
4
How many valence elections does Oxygen have?
2
8
5
10
5
Photosynthesis is an example of what type of reaction?
Exothermic reaction
Endothermic reaction
Energy reaction
Energy
6
What type of chemical reaction is this??
Synthesis
Double Replacement
Single Replacement
Decomposition
7
What subatomic particles are found outside the nucleus?
All of the above
Electrons
Protons
Neutrons
8
____________ states that mass cannot be created or destroyed in chemical reactions
Newton's 2nd Law
Newton's 1st law
Law of Conversation of Mass
Life
9
Combustion reactions need 3 things to burn they are fuel, spark and ____________?
Nitrogen
Carbon
Hydrogen
Oxygen
10
When a liquid becomes a solid is called ___________?
Deposition
Freezing
Vaporization
Sublimation
11
A balanced equation has the same _____________?
Elements
Number
atoms
amount of each element
12
When a solid changes directly to a gas is called ___________?
sublimation
freezing
Melting
vaporization
13
The factor that is measured or observed is called the __________ variable
Control
Independent
Results
Dependent
14
What element has the Symbol Au
Mercury
Sodium
Gold
Silver
15
When a chemical reaction releases MORE energy than it takes to break the old bonds is called?
Exothermic reaction
Double replacement
Chemical reaction
Endothermic reaction
16
___________ is a procedure to test your hypothesis.
Hypothesis
Observations
Results
Experiment
17
This is an example of what type of reaction?
Decomposition
Combustion
Single-replacement
Synthesis
18
When a chemical reaction gives off heat is called an ________ reaction
Endothermic reaction
Energy
Photosynthesis
Exothermic Reaction
19
C
x
H
y
+ O
2
-> CO
2
+ H
2
O is what type of chemical reaction
Decomposition
Combustion
Synthesis
Single-replacement
20
Are you ready for start the review?
I guess
Yes
Maybe I'll try
No
21
Products are the __________ of a chemical reaction?
Middle
Ending
Starting
Participate
22
What type of data deals with descriptions and is observed but not measured.
Data
Simple data
Quantitative data
Qualitative data
23
What kind of reaction is this portraying?
Double-Replacement
Synthesis
Decomposition
Single-replacement
24
When liquid becomes a gas is called?
sublimation
freezing
vaporization
melting
25
The process where 1 substance changes to produce 1 or more substances.
Chemical reaction
Double replacement
Chemistry
Science
26
What is the chemical symbol for Mercury?
O
Hg
Au
M
27
Particles in a gas are __________?
closely packed
vibrating in place
move freely
loosely packed
28
What type of data deals with numbers such as length, height and area
Data
Simple data
Qualitative data
Quantitative data
29
Reactants are the __________ material?
Ending
Middle
Starting
Participate
30
__________ is gathered through your senses?
Experiments
Ideas
Observations
Hypothesis
31
Na, Cl, O & C are all examples of what?
Chemicals
Elements
Organic Molecules
Products
32
Aluminum has how many valence electrons?
5
8
3
1
33
The forms of matter include plasma, liquid, solid and________?
liquid
solid
vapor
gas
34
What is the graph showing?
Acceleration
Fast then Slow
Deceleration
No Movement
35
what subatomic particles are found in the nucleus of an atom?
electrons and neutrons
neutrons
protons and neutrons
electrons
36
Why are chemical equations the same in every country in the world?
Because they wanted to
It looks cool
Everyone can understand it
Don't know how else to write it
37
In the scientific method how many sense do you use to collect observations?
2
5
6
3
38
What is often written in an If....and Then...statement
Conclusion
Graphs
Hypothesis
Observation
39
A good or "valid" experiment has ______ variable.
4
2
3
1
40
A clue that a chemical reaction is taking place can be seen by what 3 things?
Heat, light, color change
Heat, gas formation, color change
Cold, light, color change
Everything
41
What is the graph portraying?
Acceleration
Deceleration
Going Really Really fast!!
No Movement
42
The factor that is changed or tested is known as the _________ variable.
Hypothesis
Dependent
Control
Independent
43
Photosynthesis is an example of what type of reaction?
Combustion reaction
Exothermic reaction
Chemical reaction
Endothermic reaction
44
when energy is added particles move __________?
slower
all over the place
stay frozen
faster
