8.4 Detecting Chemical Reactions

8.4
Detecting Chemical Reactions

​1) Learn about different ways of telling if a chemical reaction happened
2)Test gases given off in reactions so that identify them

Multiple Choice

What do you think is the difference between reactants and products?

• Reactants are the final products of a reaction.
• Products are the initial substances before a reaction occurs.
• Reactants and products are the same substances in different states.
• Reactants are the starting materials, and products are the substances produced.

Multiple Choice

What do you think is the difference between chemical and physical changes?

• Chemical changes are always reversible; physical changes are not.
• Physical changes involve a change in chemical composition; chemical changes do not.
• Chemical changes create new substances; physical changes do not.
• Chemical changes occur only in living organisms; physical changes occur in non-living things.

Multiple Choice

What do you think is the difference between acid and alkali?

• Alkalis are always liquid while acids are solid.
• Acid turns litmus blue and alkali turns litmus red

• Acid high pH, Alkali has low pH

• Acid sour, Alkali bitter

Chemical reactions

Reactants and products

Multiple Select

Page 282, in reaction 1.

What are the products?

Pick two answers

• Magnesium

• hydrochloric acid

• magnesium chloride

• hydrogen

Multiple Choice

Page 282, in reaction 1.

What observation can tell that it is a chemical reaction?

• test tube

• WHite precipitate

• bubbles

• white table

Multiple Choice

Page 283, reaction 2

What chemical was used to test the presence of carbon dioxide gas?

• lime water
• sulfuric acid
• hydrochloric acid
• nitric acid

Multiple Choice

Page 283, reaction 2

What chemical was used to test the presence of carbon dioxide gas?

• lime water
• sulfuric acid
• hydrochloric acid
• nitric acid

Multiple Choice

Page 283, reaction 3

What was the gas produced?

• Nitrogen

• Chlorine

• Oxygen

• Helium

Multiple Choice

Page 283, reaction 3

What type of splint was used to test the presence of the oxygen gas?

• Burning

• Lighted

• Normal

• Glowing

Please read page 285 - 287

Multiple Choice

Burning a piece of wood

• Chemical change

• Physical change

Multiple Choice

melting chocolate

• Chemical change

• Physical change

Multiple Choice

cooking an egg

• Chemical change

• Physical change

Multiple Choice

heating glass and bending it

• Chemical change

• Physical change

Multiple Choice

baking cake

• Chemical change

• Physical change

Multiple Choice

If zinc metal metal is added to sulfuric acid, what gas is produced?

• oxygen gas
• hydrogen gas
• carbon dioxide gas
• nitrogen gas

Multiple Choice

How do you test for hydrogen gas?

• Pop test
• Flame test
• Smell test
• Color test

Fill in the Blank

What are the non-gas product for the reaction between zinc and sulfuric acid?