Chemical Reactions Question Preview (ID: 33829)


Chemical Equations. TEACHERS: click here for quick copy question ID numbers.

___Mg + ___HCl ---- H2 + ___MgCl
a) 1Mg + 2HCl ---- H2 + 2MgCl
b) 2Mg + 2HCl ---- H2 + 2MgCl
c) 2Mg + 2HCl ---- H2 + 3MgCl
d) 1Mg + 2HCl ---- H2 + 1MgCl

What tells you the number of compounds there are in a chemical reaction?
a) subscript
b) coefficient
c) reactant
d) product

What tells you the number of atoms of each element in a compound?
a) subscript
b) coefficient
c) reactant
d) product

Combustion reactions take in which element in order to produce water and carbon dioxide?
a) nitrogen
b) carbon
c) hydrogen
d) oxygen

What type of chemical reaction is the equation below. 2Fe + 6NaBr 2FeBr3 + 6Na
a) synthesis
b) decomposition
c) single
d) double

What type of chemical reaction releases energy in the form of heat?
a) endothermic
b) subthermic
c) geothermic
d) exothermic

2Ca + O2 2CaO What is the 2 located in front of calcium (Ca) called?
a) subscript
b) coefficient
c) reactant
d) product

2Ca + O2 2CaO What is the 2 located behind oxygen (O) called?
a) subscript
b) coefficient
c) reactant
d) product

What happens to some of the mass when bubbles are formed during a chemical reaction?
a) stays the same
b) escapes as a gas
c) absorbed into each other
d) nothing

How many atoms of hydrogen (H), sulfur (S), and oxygen (O) are there in sulfuric acid (H2SO4)?
a) H-6, S-4, O-4
b) H-1, S-2, O-8
c) H-2, S-1, O-4
d) H-2, S-4, O-4

The substances to the right of the arrow in a chemical equation are called-
a) subscript
b) reactant
c) product
d) coefficient

The substances to the left of the arrow in a chemical equation are called –
a) subscript
b) reactant
c) coefficient
d) product

A + B AB What type of chemical reaction is this?
a) synthesis
b) decomposition
c) single
d) double

Which statement explains the Law of Conservation of Matter?
a) In a chemical reaction, matter can only be destroyed.
b) In a chemical reaction, matter can only be created.
c) Matter can neither be created nor destroyed in a chemical reaction.
d) Matter can be created or destroyed in a chemical reaction.

___HgO --- ___Hg + O2
a) 1HgO --- 1Hg + O2
b) 1HgO --- 2Hg + O2
c) 2HgO --- 2Hg + O2
d) 6HgO --- 3Hg + O2

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