Reaction between
HCl and
Magnesium
Bubbles Appeared
Reaction between
HCl and Iron
Bubbles Appeared Some bubbles
appeared
Nothing
Happened
‘pop’ sound
‘pop’ sound
Damp red litmus
paper remained
red.
‘pop’ sound
Fire went off
Damp red litmus
paper remained
red.
Effect of gas on
damp blue litmus
paper
Damp blue litmus
paper remained
blue.
Damp blue litmus
paper remained
blue.
Damp blue litmus
paper turned red.
Name of Gas Formed
Chemical Formula of
Gas
Hydrogen Gas
H2
Hydrogen Gas
H2
Hydrogen Gas
H2
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Observation when
metal is added to
acid
Effect of gas on
burning(lighted)splint
Effect of gas on
damp red litmus
paper
Reaction between
HCl and Zinc
Damp red litmus
paper remained
red.
Reaction between
HCl and Copper
Conclusion
1. What can you conclude about the reaction between some dilute acids and some metals?
Dilute acids react with reactive metals to produce hydrogen gas.
2. Write the general equation for the reaction between dilute acid and metal.
Metal + Acid  Hydrogen + Salt
3. How can you identify the gas formed when come dilute acids react with some metals?
A burning splint may be used. If a ‘ pop’ sound is heard when the splint is brought near the gas,
the gas is hydrogen
4. From the effect of gas on damp litmus paper, what can you conclude about the nature of
hydrogen gas?
It is not reactive
5. Arrange the metals according to their reactivity in descending order. ( most reactive first)
Iron, magnesium, zinc, copper