2.3/2.4 Evidence and Energy Review

Chemists are just like Crime Detectives because they both have to look for​ (a)   .

• evidence
• clues
• suspects
• mysteries
• chemicals

Label this diagram with the proper evidences for a chemical reaction.

a

b

c

d

Odour

Tastes good

Colour Change

Freezes

Precipitate

Bubbles

Remains the same

Energy shows in many ways what three ways would we see in chemical reactions. ​ (a)  

• Light, Heat, or Sound
• Gravity, Magnetism, Electrical
• Mechanical, Chemical, Light
• Electricity, Sound, Radiation

Organize these options into the right categories

Groups:

(a) Exothermic

,

(b) Endothermic

• Making Ice

• Cellular Respiration

• Neutralization

• Rusting

• Baking

• Fires

• Melting Ice

• Photosynthesis

• Cold packs

Match the following energy production for the right era.

• Modern era

• Fossil Fuels

• Ancient Era

• Steam Power

• Industrial Era

• Ox, Horses, Humans

Order the steps to greenhouse gas effect.

• Energy bounce off CO₂ Cloud

• Suns Energy travels through Earths atmosphere

• Energy reflects off Earth

• Energy Hits Earth again

• Temperatures begin to increase

Name one way we have been working towards lowering our carbon dioxide output?