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Law Of Mass Action
Quiz 1
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Q.1
Since gasses weigh nothing, when they are produced in a reaction they do not have to be accounted for.
True
False
Q.2
The coefficient in 3His
6
2
3
5
Q.3
A precipitate is a
liquid that forms when two solids are reacted
a solid that forms when two liquids are mixed
a gas that forms when vinegar and baking soda react
a change of color in a solution
Q.4
If reaction starts withof reactants it should produce
a total of 40g of products
a total of 10g of products
a total of 80 g of products
a total of 20g of products
Q.5
In a reaction A + B ----> C, reactant A hasand product C has 9g. How many grams does reactant B should have?
4g
5g
9g
14g
Q.6
What will weigh more when a chemical change is complete? The reactants before the chemical reaction, or the product after the reaction is complete?
They both will weigh the same
The product always weighs more than the reactant
The reactant will weigh more than the product
They both will loose mass after the reaction
Q.7
A decomposition reaction has
only one reactant
2 reactants
many reactants
none of the above
Q.8
Measure of the amount of matter
mass
volume
weight
density
Q.9
In a reaction A + B ----> AB, reactant A hasand product AB has 10g. How many grams does reactant B should have?
4g
5g
6g
14g
Q.10
2NH4OH----------> 4H+ NO2 is a
Synthesis reaction
Decompostion reaction
Combustion reaction
None of the above
Q.11
O3 ---> O + O2
Synthesis
Single Replacement
Decomposition
Combustion
Q.12
P4 + 3 O2 ---> 2 P2O3
Single Replacement
Combustion
Synthesis
Decomposition
Q.13
Which are the reactants in the following reaction?2Mg + O2 ---> 2MgO
Mg and O
MgO
Mg and MgO
O and MgO
Q.14
The number of atoms of N (nitrogen) in 3N2O5 is
2
5
6
15
Q.15
Jamie weighs a glass of water and observes its weight to beounces. Jamie then adds 6 ice cubes to the glass of water. Each ice cube weighs one ounce. After all of the ice cubes have melted, what will be theapproximate weight of the glass of water?
6
12
18 ounces
Q.16
For an object to remain at rest, which of the following must be true?
The forces on it are balanced
There is no friction
Gravity does not act on it
The object has no mass
Q.17
If you increase the force on an object, its acceleration?
decreases
stays the same
also increases
stops
Q.18
2Li + O2 ------> Liis a
Synthesis reaction
Decomposition reaction
Combustion reaction
None of the above
Q.19
C4H+ 3O2 ---------> 4CO+ 3His a
Decomposicion reaction
Combustion reaction
Sintesis reaction
None of the above
Q.20
The number in front of a compound or element is a
Subscript
Coefficient
Superscript
Charge
0 h : 0 m : 1 s
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