Question

Question
1
Question
2
Question
3
A)
Which quantity will always have a negative value?
(1 point)
the change in energy in a system during an endothermic reaction
the total bond energy of the reactants in an endothermic reaction
the change in energy in a system during an exothermic reaction
the total bond energy of the products during an exothermic reaction
A)
A candle slowly burns until the last bit of wax and wick are gone. The two reactants in this chemicalreaction are the wick and oxygen. Which statement correctly identifies components as part of thesystem or the surroundings for this chemical reaction?
(1 point)
All of the candle is part of the surroundings.
In the candle, only the wick is part of the surroundings.
In the air, only the oxygen is part of the system.
All of the air is part of the system.
A)
Which statement is true of energy in reactants during an endothermic reaction?
(1 point)
All of the energy from the reactants will be lost to the surroundings.
Some of the energy in the reactants will remain in them after the reaction, but some is lost to the
surroundings.
The energy found in the reactants remains in the system, and the reactants also take energy from the
surroundings.
All of the energy from the reactants will remain in the system.
Question
4
Question
5
A)
A cold pack is snapped, and the chemical reaction causes the pack to feel cold. Which kind ofreaction is this?
(1 point)
This is an exothermic reaction because the system took energy from the surroundings.
This is an endothermic reaction because the surroundings took energy from the system.
This is an exothermic reaction because the surroundings took energy from the system.
This is an endothermic reaction because the system took energy from the surroundings.
A)
Why is there a change in energy during chemical reactions?
(1 point)
Energy is released by the formation of chemical bonds, and energy is absorbed when the bonds are
broken.
Energy is released by the breaking of chemical bonds, and energy is absorbed when the bonds are
formed.
Chemical bonds are formed and broken, which absorbs energy.
Chemical bonds are formed and broken, which releases energy.

Answer 1

1) The change in energy in a system during an exothermic reaction (negative value).

2) In the air, only the oxygen is part of the system.

3) The energy found in the reactants remains in the system, and the reactants also take energy from the surroundings.

4) This is an endothermic reaction because the system took energy from the surroundings.

5) Energy is released by the formation of chemical bonds, and energy is absorbed when the bonds are broken.