Properties Activity9/17/14

Please get your notebookAdd this title and date

With your table partners, review the vocabulary terms from yesterday

Today’s Plan

• You will cause or observe 8 different “changes.”

• It is up to you and your team to decide if the change is chemical or physical and to find evidence to support your decision.

• You will need to quickly copy the chart • We will rotate around the room – pay

attention to the timer!

Pg # Properties Mini Lab – Remember to note properties!

Situation What happens Type of change Evidence for change

1. Burning match

2. Dissolving candy

3. Leaves changing color

4. Polyacrylate in water

5. Tums in vinegar

6. Dissolve salt in water

7. Alka-seltzer in water

8. Drink mix powder in water

Timer – 3 minutes!

• Your group will have 3 minutes to do the activity and clean up

• Use only the amounts directed (or we will run out of materials)

• I appreciate your cooperation!

Properties Activity Follow-Up9/18/14

Please get your notebook & be ready to start when the bell rings.

Find your Chart from yesterday’s activity

1. Burning match

• Chemical!• You can’t reverse this –

the change is permanent

2. Dissolving candy

• If you dissolved it by eating it, then your saliva broke chemical bonds – it would be a chemical reaction

• If you dissolved it in water – it was a just physical change

3. Leaves changing color

• Physical *• The color of the leaves

was already there – the green chlorophyll just isn’t active in cold weather and shorter daylight, so the other pigments show up.

• *Not all sources agree with this!

4. Polyacrylamide in water

• Physical• This substance is used to

absorb liquid in baby diapers (no – this isn’t recycled from baby diapers!)

• It can be dried and reused!

5. Tums in vinegar

• Tums have a composition similar to baking soda, so the vinegar caused a similar reaction.

• It’s a chemical change

6. Dissolve salt in water

• Physical• Water can be evaporated and the salt will

recrystalize

7. Alka-seltzer in water

• Chemical• The bubbles indicate that a

gas was released from the compound.

• Also, you may have noticed a temperature change.

8. Lemonade mix powder in water

• Physical• If you evaporated the

water, you would have the sugar crystal at the bottom of the glass

Make a List

Chemical Rxn Signs Physical Changes Signs

Summary

• Write a short summary: (at least four sentences!)

• How are some ways to distinguish if a change in matter is chemical or physical?

• Include some examples.