Lesson 5: Metal and Acid reactions

Question 1

What does metal + acid form?

Answer 1

Metal + acid — > salt + hydrogen

Question 2

What do we see in a chemical reaction with metal+ acid?

Answer 2

• Bubbles (effervescence)
• From Hydrogen gas produced
• New substance formed (salt)

Question 3

What is the test for hydrogen?

Answer 3

• Light a split (because hydrogen is very flammable)
• Put it in sample and a small explosion (sqeaky pop) will indicate presence of hydrogen.

Question 4

What is the reactivity series?

Answer 4

• The reactivity series is a list of metals in order of their reactivity from most to least reactive

Question 5

What two properties does a very reactive metal have?

Answer 5

• More vigorous reactions.
• Will lose electrons more easily forming positive ions (cations.)

Question 6

What are the products of a metal + water?

Answer 6

metal + water –> metal hydroxide + hydrogen

Question 7

Describe and explain the observations when a small piece of lithium is placed on the surface of a big container of water. A few drops of universal indicator have been added to the water.

Answer 7

• Fizzing as the lithium reacts with water to form hydrogen.
• Colour will change from green to purple as an alklaine hydroixde has been formed (lithium hydroxide)

Question 8

What is a salt?

Answer 8

• A salt is a substance formed when a metal ion repleaces a hydrogen ion.

Question 9

Where in the reactivity series will a metal not react with an acid?

Answer 9

• Metals below hydrogen unreactive towards the hydrogen in the acid.

Question 10

What do all acids contain?

Answer 10

• All acids contain hydrogen.

Question 11

What does a metal carbonate + acid produce?

Answer 11

Metal salt + water + carbon dioxide.

Question 12

Give word equation for neutralisation reaction.

Answer 12

Acid + Alkali/ Base –> Salt + water.

Question 13

What does the salt that is formed in a neutralisation reaction depend on?

Answer 13

• Type of acid used
• Positive ions in base, alkali, carbonate.