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