1. burning toast 2. glass breaking 3. chocolate melting 4. baking soda/vinegar 5. frozen water

1. Burning Toast

2. Glass Breaking

3. Chocolate Melting

4. Baking Soda/Vinegar

5. Frozen Water

1. Burning Toast Chemical Change - gas formation, color and taste change

2. Glass Breaking



5. Frozen Water


2. Glass BreakingPhysical Change - substance is the same, just

smaller



5. Frozen Water



smaller

3. Chocolate MeltingPhysical Change – change in state of matter

solid to liquid, but still chocolate until it starts to burn


5. Frozen Water



smaller


solid to liquid, but still chocolate

4. Baking Soda/VinegarChemical Change – gas formation and temp

change

5. Frozen Water



smaller


solid to liquid, but still chocolate

4. Baking Soda/VinegarChemical Change – gas formation and temp

change

5. Frozen Water Physical change – change in state from liquid

to solid but still water

6. Water evaporating

7. Burning Wood

8. Baking a Cake

9. Roasting Marshmallow

10. Making Lemonade

6. Water evaporatingPhysical change – change in state from liquid to gas,

but still is H2O7. Burning Wood

8. Baking a Cake


10. Making Lemonade


but still is H2O7. Burning WoodChemical change – new substance produced

(ash/charcoal), gas formation and color change8. Baking a Cake


10. Making Lemonade



(ash/charcoal), gas formation and color change8. Baking a CakeChemical change – from cake batter to cake, cannot get batter back into original form9. Roasting Marshmallow

10. Making Lemonade



(ash/charcoal), gas formation and color change8. Baking a CakeChemical change – from cake batter to cake, cannot get batter back into original form9. Roasting MarshmallowChemical change – as it’s melting, the change is physical, but when it starts to turn brown a chemical (color) change occurs10. Making Lemonade



(ash/charcoal), gas formation and color change8. Baking a CakeChemical change – from cake batter to cake, cannot get batter back into original form9. Roasting MarshmallowChemical change – as it’s melting, the change is physical, but when it starts to turn brown a chemical (color) change occurs10. Making LemonadePhysical change – sugar crystals are still in the water and can be retrieved by evaporating the water. No new substance. Anything dissolved in water is a physical change.

11.Making Putty

12. Mixing Dye and Bleach

13.Cutting Grass

14.Fireworks Exploding

15.Food Spoiling

11.Making Putty Chemical - new substance formed out of glue and

boraxA precipitate was formed (solid)12. Mixing Dye and Bleach

13.Cutting Grass


15.Food Spoiling


borax

12. Mixing Dye and BleachChemical – the bleach changed the green to blue

13.Cutting Grass


15. Food Spoiling


borax


13.Cutting Grass Physical– the grass is still grass just smaller


15.Food Spoiling


borax


13.Cutting Grass Physical – the grass is still grass just smaller

14.Fireworks ExplodingChemical – gas formation, temp change, light/glow

15. Food Spoiling


borax


13.Cutting Grass Physical – the grass is still grass just smaller

14.Fireworks ExplodingChemical – gas formation, temp change, light/glow

15. Food Spoiling – chemical, depending on food, can have color change, taste and smell change, gas formation, precipitate (milk)

What are the rules for writing chemical symbols, which help you to identify whether a chemical formula is an element or compound?

1.First letter is a capital letter2.Second letter (if there is one) is

lower case3.No cursive --- always print!

To count the elements, remember every capital letter represents an element ….. Just count the capital letters!

To count the atoms, remember ….Subscript ---- are the small numbers underneath.Coefficient --- the large number in front

How many atoms in H2O? How many elements?

To count the atoms, remember ….Subscript ---- are the small numbers underneath.Coefficient --- the large number in front

How many atoms in H2O? How many elements?Answer: There are two elements

and three atoms ….2 Hydrogen and

1 Oxygen

A Physical Change does not create a new substance; the same substance or substances still exist. Changes in states of matter from gas to liquid to solid are physical changes. Clue words are cutting, smashing, breaking, melting, freezing, boiling.

What is a physical change?

What is a Chemical Change?

During a chemical change, new substances are created which have completely different properties than the originals. Clue words --- burning, bubbling, fizzing, change of color.

List the signs of a chemical change --- explain fully!

List the signs of a chemical change --- explain fully!1. Gas formation --- new substance fizzes and

bubbles.


bubbles.2. Solid formation (precipitate) --- a new

substance (silly putty)



substance (silly putty)3. Temperature change ---- not heating or

cooling, but a spontaneous change with no outside source





4. Color change --- new substance forms in a different color (anything that is burned produces a color change)






5. Change in taste/smell --- example would be rotting food






5. Change in taste/smell --- example would be rotting food

6. Glow/light ---- examples are fireworks and glow sticks

1. burning toast 2. glass breaking 3. chocolate melting 4. baking soda/vinegar 5. frozen water

Documents