3.3.3 - acid + metal reactions

Question 1

What is the general reaction between a metal and an acid?

Answer 1

Metal + Acid → Salt + Hydrogen gas

Question 2

What salt is formed when magnesium reacts with hydrochloric acid?

Answer 2

Magnesium chloride

Reaction: Mg + 2HCl → MgCl₂ + H₂

Question 3

What salt is produced when iron reacts with hydrochloric acid?

Answer 3

Iron(II) chloride

Reaction: Fe + 2HCl → FeCl₂ + H₂

Question 4

What is one observable effect of the reaction between a metal and an acid?

Answer 4

Effervescence (bubbles) → Hydrogen gas is produced

Question 5

What happens to the metal during the reaction with an acid?

Answer 5

Metal disappears (dissolves) as it reacts

Question 6

What is the thermal nature of the reaction between a metal and an acid?

Answer 6

The reaction is exothermic

Question 7

How does the reactivity of a metal affect the speed of the reaction with acid?

Answer 7

More reactive metals (e.g., magnesium) react faster; less reactive metals (e.g., iron) react slower

Question 8

Fill in the blank: To test for hydrogen gas, collect the gas in an upside-down test tube and bring a lit splint near the _______.

Answer 8

open end

Question 9

What sound confirms the presence of hydrogen gas during the test?

Answer 9

A squeaky pop sound

Question 10

True or False: Hydrogen gas is highly flammable and burns quickly in oxygen.

Answer 10

True