Chemical Reactions Question Preview (ID: 33829)
Chemical Equations.
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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.
A + B AB What type of chemical reaction is this?
a) synthesis
b) decomposition
c) single
d) double
The substances to the left of the arrow in a chemical equation are called –
a) subscript
b) reactant
c) coefficient
d) product
The substances to the right of the arrow in a chemical equation are called-
a) subscript
b) reactant
c) product
d) coefficient
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
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
What type of chemical reaction releases energy in the form of heat?
a) endothermic
b) subthermic
c) geothermic
d) exothermic
What type of chemical reaction is the equation below. 2Fe + 6NaBr 2FeBr3 + 6Na
a) synthesis
b) decomposition
c) single
d) double
Combustion reactions take in which element in order to produce water and carbon dioxide?
a) nitrogen
b) carbon
c) hydrogen
d) oxygen
What tells you the number of atoms of each element in a compound?
a) subscript
b) coefficient
c) reactant
d) product
What tells you the number of compounds there are in a chemical reaction?
a) subscript
b) coefficient
c) reactant
d) product
___Mg + ___HCl ---- H2 + ___MgCl
a) 1Mg + 2HCl ---- H2 + 2MgCl
b) 2Mg + 2HCl ---- H2 + 2MgCl
c) 2Mg + 2HCl ---- H2 + 3MgCl
d) 1Mg + 2HCl ---- H2 + 1MgCl
___HgO --- ___Hg + O2
a) 1HgO --- 1Hg + O2
b) 1HgO --- 2Hg + O2
c) 2HgO --- 2Hg + O2
d) 6HgO --- 3Hg + O2
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