Investigation 6: Melting and Dissolving December 4-5.

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Presentation transcript:

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?

Write down complete answer for credit. Cal= m X ∆T m= 500 ml=500g ∆T=64 ˚C -12 ˚C =52˚C Cal= 500g x 52˚C = 26,000 cal

Learning Target I can differentiate between melting and dissolving.

Homework Check 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.

Page 97 and 99 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.

CHAMPS C- Only at your group. 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!

Dissolving and Melting How are dissolving and melting different? How are they the same? How would you melt a substance? How would you dissolve a substance?

Page 111 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!

Page 113 Record all your observations. Use a lot of details.

Observations 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.

Observations 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 and Dissolving 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.

Melting and Dissolving 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.

Conclusions Complete conclusions on page 113.

CHAMPS C- None H-Raise your hand A- Sitting up, recording your answers M-None P- All students working on answering Success for all students!

Green Textbook page 42 Read pages 42 to 48 Answer questions on page 119 in science notebook

Exit slip What are the 3 important ideas of energy transfer?

CHAMPS 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!!!

CHAMPS 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!