lesson 2

when carbon react with oxygen ............... is formed

• carbon dioxide

• oxygen oxide

• hydrogen

when carbon dioxide dissolve in water , the solution turns into ............ color.

• red

• blue

• violet

• doesn't change

metals tend to lose ............ electrons

• 1 only

• 2

• 3

• all the previous

when a non metal atom ............ electron , it is changed into .................

• gain , positive

• lose , negative

• gain , negative

• lose , positive

.................. don't react with Hcl ( dilute acid )

• metals

• non metals

basic oxides are metal oxides

• True

• false

Acidic oxides change the color of litmus solution into blue

• true

• false

Mgo is an example for ..............

• Acidic oxide

• basic oxide

Which of the following is a property of metals?

• They are good conductors of electricity

• They are brittle

• They have low melting points

• They are gaseous at room temperature

When a metal reacts with an acid, what is typically produced?

• Salt and hydrogen gas

• Water and carbon dioxide

• Only salt

• Only hydrogen gas