Metal Reactivity_Key Questions

Question 1

How do we determine the reactivity of metals>

Answer 1

We determine the reactivity of metals with water, acids and oxygen to determine those that are extremely reactive and others that are less so.

Question 2

How do metals react with Water?

Answer 2

• Metals in Group 1 are more reactive in water than those in Group 2 - Going down a group, the reactivity of metals in water increases - Transition metals are generally less reactive with water than group 1 & 2

Question 3

How do metals react with Acid?

Answer 3

• Same general pattern as with water. - Metals are normally more reactive in acid than in water; - more metals react with acids and the reactions tend to be more energetic. - Experimental results of metals reacting with acids lists metals in order of reactivity.

Question 4

How do metals react with Oxygen?

Answer 4

• Many metals also react with oxygen to form metal oxides. - Group 1 Metal Atoms and oxygen molecules rearrange to form a new compound Eg: Sodium + Oxygen =’s Sodium Oxide - Group 2 metals react with oxygen (O2- anion) to form oxides although not as rapidly as Group 1 metals

Question 5

Which of the following metals would you expect to be the least reactive with water? Aluminium, Sodium, Rubidium, Indium

Answer 5

Aluminium

Question 6

When a reactive metal is added to water, bubbles or fizzing can be observed. Explain the appearance of the bubbles

Answer 6

The bubbles contain hydrogen gas, which is produced when a reactive metal reacts with water.

Question 7

True or False. All metals react with acid to produce hydrogren gas?

Answer 7

FALSE

Question 8

True or False. Hydrogen is a flammable gas?

Answer 8

TRUE

Question 9

True or False. The most reactive metals are located at the top of a group in the periodic table

Answer 9

FALSE

Question 10

True or False. A metal that is reactive with water is likely to be less reactive with a solution of dilute acid.

Answer 10

FALSE

Question 11

True or False. When metals react with oxygen in the air, they release energy

Answer 11

TRUE

Question 12

Write the word equation for the reaction that occurs when magnesium is heated strongly in the air

Answer 12

magnesium + oxygen → magnesium oxide