Magnesium and Hydrochloric Acid

Click on the correct answer.



1 In the chemical reaction Mg + HCl, magnesium (Mg) reacts with hydrochloric acid (HCl) to form magnesium chloride and hydrogen gas. What kind of reaction is this?
a combination reaction
a decomposition reaction
a single replacement reaction
a double replacement reaction

2 In a chemical reaction magnesium metal is converted to magnesium ion. What is true of this chemical change?
magnesium has been oxidized
magnesium has become more positive
magnesium has been reduced
magnesium has gained electrons
magnesium has lost electrons

3 Magnesium metal is in Group IIA of the Periodic Table. What can therefore be predicted about magnesium?
it is a non-metal
it has a tendency to lose two electrons
it has a tendency to gain two electrons
the oxidation number of its ion will be 2+
it is a metal

4 The oxidation number of an element
will be the same as its Group number in the Periodic Table
will be zero for any atom not combined with another element
will be zero for any element combined only with itself
can be either negative or positive
can be deduced from other known oxidation numbers in a compound

5 For a single replacement reaction A + BC forms AC + B
in order for the reaction to occur, B must be more reactive than A
A must be more reactive than B
C must be able to be transferred to A
A corresponds to hydrogen in this demonstration
C corresponds to magnesium in this demonstration

6 In the reaction in this demonstration
hydrogen changes oxidation number
chlorine changes oxidation number
magnesium changes oxidation number
magnesium becomes more positive when reaction occurs
hydrogen becomes more positive when reaction occurs

7 Which is (are) true:
magnesium metal is oxidized in this reaction
magnesium metal is reduced in this reaction
hydrogen is oxidized in this reaction
hydrogen is reduced in this reaction
the oxidation number of chlorine is 2-

8 The hydrogen gas in this experiment
dissolved in the water
displaced the water
was lighter than water
was oxidized
was reduced

9 The magnesium passed its electrons
to water
to hydrogen gas
to chlorine
to magnesium ions
to the hydrogen ions

10 4 grams of magnesium would produce
22 mL of hydrogen gas
50 mL of hydrogen gas
10 mL of hydrogen gas
22.4 L of hydrogen gas
7 mL of hydrogen gas