instruction:
In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.
question:
Question: If Mary is playing music in her room and the heater stops working, causing the temperature to fall, what happens to the speed of the soundwaves her radio is generating?
Answer: decreases
answer:
For a given medium, sound has a slower speed at lower temperatures.

question:
Question: John was playing with alkanes in his lab. If he increased the amount of carbon atoms in an alkane, what would happen to the boiling point of that alkane?
Answer: increase
answer:
Alkanes with more carbon atoms have higher boiling and melting points, so some of them are solids at room temperature.

question:
Question: Compared to a box of feathers a box of bricks would be
Answer: heavier
answer:
A given volume of a denser substance is heavier than the same volume of a less dense substance.