2nd semester review regular

What is oxidation number of O in O₂ ?

• 0
• -2
• +1
• +2

Oxidation is

• lose of oxygen

• gaining electrons

• gaining Hydrogen

• losing electrons

What two elements make up steel?

• copper and tin
• copper and zinc
• iron and copper
• iron and carbon

A molecule can be polar if it is symmetrical.

• true
• false

H₂O

• Polar 
• Nonpolar 

When metals bond with non-metals they form what type of bonds

• covalent
• ionic
• cooperative
• lewis

Tags

NGSS.HS-PS1-2

A substance that speeds up a chemical reaction without being permanently changed itself is a(n) ____.

• catalyst
• coefficient
• inhibitor
• reactant

Why does soap work to clean oily skin?

• it has a polar and a nonpolar end so it can dissolve oil and water
• it has a special chemical that cleans
• it has a antibacterial to kill the smell
• it has chemicals that smell good

What happens when you heat up molecules?

• They move faster

• They move slower

• They move the same as at colder temperatures

What kind of acid can onions produce in your eye?

• sulfuric
• nitric
• hydrochloric
• carbonic