Chemical Reactions 1 from videos

During a chemical Reaction

• Chemicals stay the same

• New substances are formed

• The chemical properties change

• The chemical properties stay the same

A change in temperature can show a chemical reaction

• Only when a substance gets warmer

• Only when a substance gets colder

• Both when a substance gets hotter and colder

• The tempertature should remain the same

A PRECIPITATE is when

• You mix two liquids and a solid forms

• You mix to solids and get a liquid

• you mix blue and white and get green

When a chemical reaction makes a gas

• You can see bubbles

• You can hear fizzing

• gas is the same as smoke

To say a chemical reaction has occurred we should see two or more indicators. Choose the possible indicators below

• bubbling/fizzing

• color change

• precipitate

• change in temperature

• new odor/smell

Which of the following were there before the reaction?

• HCl

• H₂

• Zn

• ZnCl₂

Which of the following were there after the reaction?

• HCl

• H₂

• Zn

• ZnCl₂

What indicator(s) was/were observed with the bubbles after the chemical reaction

• pop

• light

• heat

• sound

Combustion Indicators include

• pop

• light

• heat

• sound

When hydrogen atoms are left together they will Automatically form

• H₁ Gas

• H₂ Gas

• H₃ Gas