Question 1

What name is given to a reaction which transfers energy to the surroundings?

Accepted Answer

exothermic

Answer

endothermic

Question 2

What name is given to a reaction which transfers energy from the surroundings?

Accepted Answer

endothermic

Answer

exothermic

Question 3

What is a reaction profile?

Accepted Answer

diagram showing how the energy changes in a reaction

Answer

diagram showing what products are formed

Answer

diagram showing what reactants are reacting

Answer

diagram showing what by-products are made

Question 4

What is the term used to describe the minimum amount of energy required before a collision will result in a reaction?

Accepted Answer

activation energy

Answer

reaction energy

Answer

bond energy

Answer

input energy

Question 5

What term is used to describe the energy required to break a bond or the energy released when a bond is formed?

Accepted Answer

bond energy

Answer

reaction energy

Answer

internal energy

Answer

activation energy

Question 6

When reaction requires less energy to break the bonds than is released when making the bonds, is the reaction said to be exothermic or endothermic?

Accepted Answer

exothermic

Answer

endothermic

Question 7

When a reaction requires more energy to break the bonds than is released when making the bonds, is the reaction said to be exothermic or endothermic?

Accepted Answer

endothermic

Answer

exothermic

Question 8

How are chemical cells made?

Accepted Answer

connect two different metals electrodes in a solution, electrolyte

Answer

connect a non-metal electrode with a metal electrode in a molten solution, electrolyte

Answer

connect two different non-metals electrodes in a solution, electrolytes

Answer

connect two of the same metal electrodes in an electrolyte solution

Question 9

What name is given to two or more chemical cells connected in series?

Accepted Answer

battery

Answer

electric cell

Answer

generator

Answer

electrical inductor

Question 10

How does the potential difference of a cell depend on the metals that the electrodes are made of?

Accepted Answer

the bigger the difference in reactivity, the greater the potential difference

Answer

the smaller the difference in reactivity, the greater the potential difference

Answer

the bigger the difference in reactivity, the smaller the potential difference

Answer

the smaller the difference in reactivity, the smaller the potential difference

Question 11

How can some cells be recharged?

Accepted Answer

by applying an external current

Answer

by leaving the cell to cool down

Answer

by heating the cell

Answer

by connecting it to a magnetic metal

Question 12

Why can some cells not be recharged?

Accepted Answer

the reaction cannot be reversed

Answer

the fuel has run out in the cell

Answer

the products of the cell reaction form gases and escape

Answer

the electrodes in the cell have worn away

Question 13

What name is given to a cell that uses a fuel and oxygen to generate electricity?

Accepted Answer

fuel cell

Answer

generator cell

Answer

inductor cell

Answer

chemical cell

Question 14

In the hydrogen fuel cell, what is the overall reaction?

Accepted Answer

$2	ext H_2(	ext g) + 	ext O_2(	ext g)  ightarrow 2	ext H_2	ext O(	ext l)$

Answer

$	ext {2HNO}_3	ext {(aq) + 2Na(s)}ightarrow 	ext {2 NaNO}_3(	ext g) + 2	ext H_2(	ext g)$

Answer

$	ext H_2	ext O(	ext l)  ightarrow 2	ext O(	ext g) + 2	ext H_2(	ext g)$

Answer

$2	ext H_2(	ext g) + 	ext H_2	ext O(	ext l)  ightarrow 2	ext H_2	ext O(	ext l)$

Question 15

In the alkaline hydrogen fuel cells, one of the half equations is:
$	ext {2H}_2	ext {(g) + 4OH}^{−}	ext {(aq)} ightarrow 4	ext H_2	ext {O(l)} + 4	ext e^−$
What is the other half equation?

Accepted Answer

$	ext{O}_2	ext {(g)} + {	ext2{	ext{H}_2}}	ext {O(l)} + {4	ext{e}}^-  ightarrow 	ext 4{	ext{OH}}^-(	ext {aq})$

Answer

$5	ext H_2	ext O_2(	ext l)  ightarrow 5	ext O_2(	ext g) + 10	ext {H(g)  + 10}e^−$

Answer

$2	ext H_2	ext{(g) + O}_2(	ext g)  ightarrow 2	ext H_2	ext O(	ext l)$

Answer

$	ext{2Br}^−	ext {(aq)}  ightarrow 	ext {Br}_2(	ext l) + 2e^−$

Question 16

Which of these is NOT an advantage of the hydrogen fuel cell?

Accepted Answer

cheap to manufacture

Answer

small in size

Answer

do not need to be electrically recharged

Answer

only product is water

Question 17

Which of these is NOT a disadvantage of the hydrogen fuel cell?

Accepted Answer

once they go flat they will be sent to landfill

Answer

hydrogen is flammable

Answer

difficult to store

Answer

hydrogen is often produced from non-renewable sources

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