Find the mass of a sample of water if its temperature dropped 24. 8°C when it lost 870 J of heat. Hint. Which formula are you going to use? See

interactive PPT. Don't forget the unit. Show your work.

How much heat is required to warm a 135g cup of water from 15 °C to

35°C? Hint: the water is in a cup so what state of matter and specific heat?

Show your work.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

the formula for the conversion of temperature from degree celsius to kelvin is:

the sample of water at is converted to kelvin temperature by using the above formula as:

on comparing the two samples of water at or we can say that at and at respectively. the difference between the temperatures of two samples of water is:

hence, one can say that the sample of water at is greater than the sample of water at by .