Calculating Heat

A student mixed 30 mL of water at 15oC and 30 mL of water at 55 oC. The final temperature is 35 oC. How many calories transferred from the hot water? (Use the hot water numbers) (Answer will be negative) Include Units in your Answer

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A student has a 10 L (10,000 mL) fish tank. The water needs to be 28°C for her tropical fish. When she filled the tank, the temperature of the water was 12°C. How many calories of heat must transfer to the aquarium before it is ready for the fish? (include commas) 1 g = 1 mL

Answer explanation

First calculate the

$\Delta T$ and then multiply by the mass of the water. Remember 1 g = 1 mL so 10,000 mL = 10,000 g

Tags

NGSS.MS-PS1-4

A student mixed 30 mL of water at 15^oC and 30 mL of water at 55 ^oC.

What is the final temperature of the water?

(You can just type the number)

Answer explanation

The final temperature is 35 oC because we have the same amount of water in each sample.

We can use the formula

$Tf\ =\ \frac{T_1-\ T_2}{2}$ to calculate it using the temperatures given.

Tags

NGSS.MS-PS1-4

A student mixed 30 mL of water at 15^oC and 30 mL of water at 55 ^oC. The final temperature is 35 oC.  How many degrees did the cold water increase? (You can just type the number)

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A student mixed 30 mL of water at 15oC and 30 mL of water at 55 oC. The final temperature is 35 oC. How many degrees did the hot water decrease? (Answer is Negative)

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A student mixed 30 mL of water at 15^oC and 30 mL of water at 55 ^oC. The final temperature is 35 oC. 

How many calories transferred to the cold water? (Use the cold water numbers)

Include Units in your Answer

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A student made tea. She started with 300 g of water at 20°C. She transferred 18,000 cal to the water.

What was the final temperature of the water?

Plug the numbers into the formula above

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Energy "flow" is the transfer of energy from one place to another. Which direction does energy flow?

• From cold to hot

• From hot to hot

• From hot to cold

• From cold to cold

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

As an object's thermal energy increases, its particles move

• Faster

• Slower

• The same rate

Tags

NGSS.MS-PS1-4

What is the formula to calculate the amount of heat transferred in a substance?

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4