Chemical Reactions And The Conservation Of Mass Question Preview (ID: 18907)


Identify The Common Outcome Of All Chemical Changes. Identify The Reactants And Products Of A Chemical Reaction. Recognize That In A Chemical Reaction The Mass Of The Reactants Is Equal To The Mass Of The Products (Law Of Conservation Of Mass). TEACHERS: click here for quick copy question ID numbers.

The following word equation describes a chemical reaction in which hydrogen is produced. magnesium + hydrochloric acid - magnesium chloride + hydrogen What is the source of the atoms in the hydrogen gas produced by this reaction?
a) magnesium
b) hydrochloric acid
c) both magnesium and hydrochloric acid
d) neither magnesium nor hydrochloric acid

Examine the following chemical equation, which shows only the reactions and one product. Zn + 2HCl - ZnCl2 + ? How many H atoms must be present in the second product that is formed?
a) 1
b) 2
c) 3
d) 4

In a chemical reaction, the mass of the products always __ the mass of the reactants.
a) equals
b) differs
c) resembles
d)

What does the law of conservation of mass state?
a) The total mass of the reactants is greater than the total mass of the products.
b) The total mass of the reactions is less than the total mass of the products.
c) The total mass of the reactions equals the total mass of the products.
d) Mass can be created but not destroyed.

The __ states that matter cannot be created or destroyed during a physical or chemical change.
a) law of conservation of mass
b) law of undestroyable mass
c) law of matter creation
d) law of chemical equations

A(n) __ uses chemical symbols and formulas to describe a chemical reaction.
a) chemical equation
b) reactant
c) product
d) symbol equation

A(n) __ is a substance that reacts with another substance in a chemical reaction.
a) reactant
b) product
c)
d)

A(n) __ is a substance that is produced during a chemical reaction.
a) reactant
b) product
c)
d)

A(n) __ occurs when oxygen combines with another substance.
a) combustion reaction
b) chemical reaction
c) chemical equation
d) oxygen reaction

Which of the following equations does NOT demonstrate the law of conservation of mass?
a) 2Na + Cl2 2NaCl
b) NaOH + HCl NaCl H20
c) P4 + 5O2 2P4O10
d) SnCl2 + 2FeCl3 2FeCl2 + SnCl4

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