# Chemistry

posted by .

calories given off when 85g of water cools from 48C to 23C.
Express your answer using two significant figures.

I know the answer is 2100 cal, but I just need to know why the answer is a positive value instead of negative, when it is supposed to be cooling down.

• Chemistry -

Cooling water means the heat is given off and heat emitted is negative, always. Look at it the other way. If heat were absorbed, it would be positive and the temperature of the water would increase. Right?

• Chemistry -

I have another question about this problem. I know that dT is (T(final)-T(initial)).

is the T(final)=23C or is it 48C?

since it's from "48C to 23C", shouldn't the final be 23C? and the initial 48C?

## Respond to this Question

 First Name School Subject Your Answer

## Similar Questions

1. ### Chemistry

Suppose you use 135 calories of energy to perform a task, how many joules have you used?
2. ### Math

Find the largest angle for which sine and tangent agree to within two significant figures. Express your answer using two significant figures. Answer in radians ?
3. ### Physics

Item 4 Two 2.0 masses are 1.0 apart on a frictionless table. Each has 1.0 of charge Part A - What is the magnitude of the electric force on one of the masses?
4. ### physics

Item 4 Two 2.0 masses are 1.0 apart on a frictionless table. Each has 1.0 of charge. Part A - What is the magnitude of the electric force on one of the masses?
5. ### Physics

Problem 21.40 A pair of 10uF capacitors in a high-power laser are charged to 1.7kV. Paige Nieuwenhuis Part A - What charge is stored in each capacitor?
6. ### Physics

Problem 22.16 A 7.5 v battery supplies a 3.5 mA current to a circuit for 8.2 Hr . Part A - How much charge has been transferred from the negative to the positive terminal?
7. ### physics

Find its density. Express your answer to two significant figures and include the appropriate units How does this compare with the density of water?
8. ### Physics

Mars, on average, is 140 million miles from the Sun. 1 mi = 1609 m . Part #1: Express the distance between Mars and the Sun in meters using powers of 10. Express your answer using two significant figures. Answer: d =2.25×10^11 m Part …
9. ### physics

Find the direction and magnitude of the following vectors. A⃗ =( 22 m )x^+( -15 m )y^ Express your answer in degrees using three significant figures. θA = Part B Express your answer in meters using two significant figures. |A⃗ …
10. ### PHYSICS

PLEASE HELP WITH PART E AND F THANKS!! Find the direction and magnitude of the following vectors. A⃗ =( 22 m )x^+( -15 m )y^ Express your answer in degrees using three significant figures. θA = THE ANSWER IS-34 Part B Express your …

More Similar Questions