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# Investigation 6 : Melting and Dissolving - PowerPoint PPT Presentation

Investigation 6 : Melting and Dissolving. December 4-5. Warm Up. Ben and Jonah are making hot cocoa. They used 500 ml of milk. The temperature of the milk was 12 ˚C. After they heated it, the milk was 64 ˚C. How many calories of heat transferred to the milk?.

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### Investigation 6: Melting and Dissolving

December 4-5

• Ben and Jonah are making hot cocoa. They used 500 ml of milk. The temperature of the milk was 12 ˚C. After they heated it, the milk was 64 ˚C. How many calories of heat transferred to the milk?

Cal= m X ∆T

m= 500 ml=500g

∆T=64 ˚C -12 ˚C =52˚C

Cal= 500g x 52˚C = 26,000 cal

I can differentiate between melting and dissolving.

• Open your notebook to page 97

• We are going to correct the work.

• This will be used as part of a notebook grade so write down all answers.

• One set of answers per table.

• Everyone at the table must write all answers.

• You must copy all the work, not just the final answer.

• Raise your hand when finished.

H-Raise your hand if you have a question.

A- Sitting up, working on answers.

M-None.

P- All students working on pages 97 and 99.

Success for all students!

• How are dissolving and melting different?

• How are they the same?

• How would you melt a substance?

• How would you dissolve a substance?

• You will work with a cup of hot water and cold water.

• You will have 2 foil cups floating on the water.

• You will have 4 M&Ms to use.

• DO NOT SQUASH, EAT, THROW!!

• Place one candy in each foil cup and one in the water.

• Do not stir or touch the candy!

• Use a lot of details.

• What happened to the colored coating?

• It dissolved in both hot and cold water and it stayed in place in the foil cups.

• Where did the colored coating go?

• In the water. It spread throughout the water.

• What happened to the candies in the foil cups?

• The one in the cup over hot water cracked and got soft and gooey. The one over cold did not change.

• What happened to the chocolate in the water?

• The one in hot water got soft and gooey, the one in cold water stayed hard.

• Melting is when a solid material changes to liquid.

• The change is caused by heat.

• When the particles have enough KE, they start to move past one another as a liquid.

• Dissolving is when a solid substance is placed in a liquid and particles of the solid substance break away and move into the liquid.

• A solution is made of particles of a substance mixed uniformly with particles of the liquid in which it is dissolved.

• Complete conclusions on page 113.

C- None

M-None

P- All students working on answering

Success for all students!

• Read pages 42 to 48

• Answer questions on page 119 in science notebook

• What are the 3 important ideas of energy transfer?

C- Only with your group. Only on topic.

H- Check in book, notes, and ask your group members. Raise your hand if you have a question

A- Answering questions on page 87.

M- None

P- All students working on questions.

Success for all!!!

C- None

H-Raise your hand if you have a question.

A- Sitting up, working on quiz

M-None

P- All students sitting quietly correcting quiz.

Success for all students!