Heat curve calculations of water

How much heat will Shizen need to add to 4.8 g of water at 18 °C to change it to water at 53° C?

(a)  

Answer explanation

So, first make sure you see if the temp is increasing or decreasing. This tells you if Q should be negative or positive or if you are adding or taking away energy. Using this formula, (m*Cp*ΔT) Identify the variables in the problem and plug them into the right space. It should look like this - Q total = 4.8 g X 4.184 J/(g*°C) X (53 °C - 18 °C) - Now calculate the formula and this should be your answer 702.91 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

How much heat will Jackson need to take away from 3.6 g of steam at 123 °C to change it to steam at 106° C?

(a)  

Answer explanation

So, first make sure you see if the temp is increasing or decreasing. This tells you if Q should be negative or positive or if you are adding or taking away energy. Using this formula, (m*Cp*ΔT) Identify the variables in the problem and plug them into the right space. It should look like this - Q total = 3.6 g X 1.996 J/(g*°C) X (106 °C - 123 °C) - Now calculate the formula and this should be your answer -122.16 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

How much heat will Brayden need to add to 5.4 g of ice at -8 °C to change it to water at 51° C?

(a)  

Answer explanation

So, first make sure you see if the temp is increasing or decreasing. This tells you if Q should be negative or positive or if you are adding or taking away energy. Using this formula, (m*Cp*ΔT) + (Mass*Heat of fusion) + (m*Cp*ΔT) Identify the variables in the problem and plug them into the right space. It should look like this - Q total = (5.4 g X 2.108 J/(g*°C) X (0 °C - -8 °C)) + (5.4 g X 334 J/g) + (5.4 g X 4.184 J/(g*°C) X (51 °C - 0 °C)) - Now calculate the formula and this should be your answer 3046.94 J

Tags

NGSS.HS-PS3-1

How much heat will Ava need to take away from 19.6 g of steam at 134 °C to change it to water at 77° C?

(a)  

Answer explanation

So, first make sure you see if the temp is increasing or decreasing. This tells you if Q should be negative or positive or if you are adding or taking away energy. Using this formula, (m*Cp*ΔT) + (mass * Heat of vaporization) + (m*Cp*ΔT) Identify the variables in the problem and plug them into the right space. It should look like this - Q total = (19.6 g X 1.996 J/(g*°C) X (100 °C - 134 °C)) + (19.6 g X -2260 J/g) + (19.6 g X 4.184 J/(g*°C) X (77 °C - 100 °C)) - Now calculate the formula and this should be your answer -47512.28 J

How much heat will Ben need to add to 8.6 g of ice at -33 °C to change it to ice at -17° C?

(a)  

Answer explanation

So, first make sure you see if the temp is increasing or decreasing. This tells you if Q should be negative or positive or if you are adding or taking away energy. Using this formula, (m*Cp*ΔT) Identify the variables in the problem and plug them into the right space. It should look like this - Q total = 8.6 g X 2.108 J/(g*°C) X (-17 °C - -33 °C) - Now calculate the formula and this should be your answer 290.06 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

How much heat will Xernavien need to take away from 7.6 g of steam at 130 °C to change it to steam at 123° C?

(a)  

Answer explanation

So, first make sure you see if the temp is increasing or decreasing. This tells you if Q should be negative or positive or if you are adding or taking away energy. Using this formula, (m*Cp*ΔT) Identify the variables in the problem and plug them into the right space. It should look like this - Q total = 7.6 g X 1.996 J/(g*°C) X (123 °C - 130 °C) - Now calculate the formula and this should be your answer -106.19 J

Tags

NGSS.HS-PS3-4

How much heat will Henry need to take away from 11.2 g of steam at 112 °C to change it to water at 88° C?

(a)  

Answer explanation

So, first make sure you see if the temp is increasing or decreasing. This tells you if Q should be negative or positive or if you are adding or taking away energy. Using this formula, (m*Cp*ΔT) + (mass * Heat of vaporization) + (m*Cp*ΔT) Identify the variables in the problem and plug them into the right space. It should look like this - Q total = (11.2 g X 1.996 J/(g*°C) X (100 °C - 112 °C)) + (11.2 g X -2260 J/g) + (11.2 g X 4.184 J/(g*°C) X (88 °C - 100 °C)) - Now calculate the formula and this should be your answer -26142.59 J

Tags

NGSS.HS-PS3-1

How much heat will Devyn need to add to 5.6 g of water at 33 °C to change it to water at 69° C?

(a)  

Answer explanation

So, first make sure you see if the temp is increasing or decreasing. This tells you if Q should be negative or positive or if you are adding or taking away energy. Using this formula, (m*Cp*ΔT) Identify the variables in the problem and plug them into the right space. It should look like this - Q total = 5.6 g X 4.184 J/(g*°C) X (69 °C - 33 °C) - Now calculate the formula and this should be your answer 843.49 J

Tags

NGSS.HS-PS3-4

How much heat will Angel need to add to 7.8 g of ice at -34 °C to change it to steam at 122° C?

(a)  

Answer explanation

So, first make sure you see if the temp is increasing or decreasing. This tells you if Q should be negative or positive or if you are adding or taking away energy. Using this formula, (m*Cp*ΔT) + (Mass*Heat of fusion) + (m*Cp*ΔT) + (mass * Heat of vaporization) + (m*Cp*ΔT) Identify the variables in the problem and plug them into the right space. It should look like this - Q total = (7.8 g X 2.108 J/(g*°C) X (0 °C - -34 °C)) + (7.8 g X 334 J/g) + (7.8 g X 4.184 J/(g*°C) X (100 °C - 0 °C)) + (7.8 g X 2260 J/g) + (7.8 g X 1.996 J/(g*°C) X (122 °C - 100 °C)) - Now calculate the formula and this should be your answer 24398.28 J

Tags

NGSS.HS-PS3-1

How much heat will Jada need to add to 15.4 g of water at 48 °C to change it to water at 55° C?

(a)  

Answer explanation

So, first make sure you see if the temp is increasing or decreasing. This tells you if Q should be negative or positive or if you are adding or taking away energy. Using this formula, (m*Cp*ΔT) Identify the variables in the problem and plug them into the right space. It should look like this - Q total = 15.4 g X 4.184 J/(g*°C) X (55 °C - 48 °C) - Now calculate the formula and this should be your answer 451.04 J

Tags

NGSS.HS-PS3-1