Heat Practice Problems

What is the equation for calculating final temperature when equal masses of water are mixed?

• $cal\ =\ m\ x\ \Delta T$

• $Tf\ =\ \frac{T_1\ -\ T_2\ }{2}$

• $\Delta T\ =\ Tf\ -\ Ti$

• $\Delta T\ =\ cal\ x\ m$

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is the equation for calculating energy transfer?

• $cal\ =\ m\ x\ \Delta T$

• $Tf\ =\ \frac{T_1\ -\ T_2\ }{2}$

• $\Delta T\ =\ Tf\ -\ Ti$

• $\Delta T\ =\ cal\ x\ m$

Tags

NGSS.MS-PS3-3

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.

What is the final volume of the water?

Include Units in your answer

Answer explanation

The Final Volume is 60 mL because you have to add 30 mL and 30 mL from both the hot and cold water samples.

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

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 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 15^oC 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)

(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 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-PS1-4

NGSS.MS-PS3-4

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 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

What happened to the kinetic energy of the hot water particles?

• The kinetic energy decreased

• The kinetic energy increased

• The kinetic energy stayed the same

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What happened to the kinetic energy of the cold water particles?

• The kinetic energy decreased

• The kinetic energy increased

• The kinetic energy stayed the same

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5