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Chemical Reactions
Quiz 1
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Q.1
The word oxidation describes
gain of electrons
loss of electrons
number of electrons remains the same
number of electrons transfered
Q.2
The word reduction describes
gain of electrons
loss of electrons
number of electrons remains the same
transfer of electrons
Q.3
What type of reaction is illustrated below?2HI --> H+ I2
synthesis
decomposition
single replacement
double replacement
Q.4
Which of the following options correctly balances the equation below?__HNO2 + __O2 --> __HNO3
4, 1, 4
1, 2, 1
1, 2, 1
2, 1, 2
Q.5
Which of the following is NOT a sign of a chemical reaction?
Color changes
Cutting into fourths
Light is produced
Gas is formed
Q.6
True or FalseIn a chemical reaction, no new atoms are created, and no atoms are destroyed.
true
false
Q.7
A metal is reacted with an acid to produce a salt and a hydrogen gas. What type of reaction has occurred?
neutralization
double replacement
single replacement
synthesis
Q.8
What are the correct coefficients when this equation is balanced?KClO--> KCl + O2
2,2,2
2,2,3
1,2,3
3,3,3
Q.9
Which half reaction shows the element being reduced. In the following reaction. 2Na + Cl--> 2NaCl
Na0 --> Na+1 + 1e-
Cl20 + 2e- --> 2Cl-
Na0 + 1e- --> Na+1
Cl20 --> 2Cl- + 2e-
Q.10
Potassium iodide is a catalyst in a chemical reaction where would this be placed when writing the chemical reaction?
product side
reactant side
above the arrow
left out
Q.11
A compound is reacted and forms two new substances. What type of reaction is this?
combustion
synthesis
decomposition
single replacement
Q.12
An element plus additional element reacts to form one product is an example of which type of chemical reaction?
combustion
decomposition
synthesis
single replacement
Q.13
Predict the following reaction NaCl + Ca(NO3)2 -->
no reaction both products are aqueous
Calcium chloride and sodium nitrate are produced
sodium nitrate is a solid formed
calcium chloride is the solid formed
Q.14
Provides evidence that a chemical reaction has occurred.
dissolving
melting
formation of a gas
bending
Q.15
Describes the number of molecules in a compound and is used to balance a chemical reaction.
coefficient
subscript
superscript
SI unit
Q.16
Which of the following compounds will not disassociate in water?
NaCl
PbCl2
MgNO3
Na2SO4
Q.17
Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas this happens because?
Magnesium is higher on the reactivity series then hydrogen
magnesium is more reactive than hydrogen
magnesium is able to break the bond between HCl and form MgCl2
both b and c are correct
Q.18
Describes the number of atoms in a compound of each element.
coefficient
superscript
subscript
SI unit
Q.19
Balance this equation._CF4 + _Br2 -- _CBr4 + _F2
2,1,2,1
1,2,2,1
1,2,1,2
2,2,2,2
Q.20
How many HCl molecules do you need to balance this equation? Mg + __HCl ---> MgCl2 + H2
1
2
3
4
0 h : 0 m : 1 s
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