A scientist heats an unknown substance in a closed system. The graph shows the change in temperature over time.

C

Explanation:

When a substance is changing state, the heat supplied does not result in a rise in temperature. This is why, the heat supplied during change of state is referred to as 'latent heat'.

Latent heat is a heat that causes a change of state without a corresponding rise in temperature. During this time, the intermolecular bonds in the substance are broken.

Change of state will occur as regions in which there is no change in temperature with time such as point D on the graph.

10th year

Step-by-step explanation:

Ric made two investments.

Investment Q

Amount = $500 at end of the year

Increase $45 per year.

Value of investment after x year

we take time (x-1) because investment was end of first year.

Investment R

Amount = $400 at end of the year

Increase 10% per year.

Value of investment after x year

we take time (x-1) because investment was end of first year.

Eric checks the value of his investments once a year, at the end of the year.

Eric sees that investment R's value exceeded investment Q's value

Investment R > Investment Q

Using graphing calculator

Hence, In 10th year Investment R could be greater than Investment Q