C3 Activate 2

What is the correct equation below?

• metal + acid → metal oxide
• metal + acid → metal hydroxide
• metal + acid → metal salt + hydrogen
• metal + acid → metal hydroxide + hydrogen

How do you test for hydrogen?

• bubble it through limewater. If it turns milky hydrogen is present
• put a lit splint into a test tube of hydrogen. It will burn with a squeaky pop
• put a glowing splint into a test tube of hydrogen. If hydrogen is present, the splint will re-light
• put a light splint into a test tube of hydrogen. It will go out if hydrogen is present.

Which is the correct order of reactivity, from most reactive to least reactive?

• magnesium, zinc, iron, lead
• zinc, magnesium, lead, iron
• zinc, magnesium, iron, lead
• magnesium, zinc, lead, iron

What happens when you react magnesium with oxygen?

• Nothing happens
• it spits and causes sparks to fly.
• the magnesium turns black
• it burns vigorously, with a bright white flame.

What do (s), (g), (l), (aq) mean in a reaction?

• solute, gas, liquid, aqueous
• solid, gas, liquid, aqueous
• solute, gel, liquid, aqueous
• solid, gel, liquid, aqueous

Which of these reactions is a balanced equation for:
magnesium + water --> magnesium oxide + hydrogen

• 2Mg + H₂0  →  2Mg0 + H₂
• Mg + 2H₂0  → Mg0 + 2H₂
• Mg + H₂0  → Mg0 + H₂
• 2Mg + 2H₂0  → Mg0 + H₂

What is the definition of an ore?

• Ores are naturally occurring rocks that contain metal or metal compounds in sufficient amounts to make it financially worthwhile extracting them. 
• Ores are naturally occurring rocks that contain oxygen or oxide compounds in sufficient amounts to make it financially worthwhile extracting them. 
• Ores are naturally occurring rocks that contain sulfur or sulfide compounds in sufficient amounts to make it financially worthwhile extracting them. 
• Ores are naturally occurring rocks that contain hydrogen or hydroxide compounds in sufficient amounts to make it financially worthwhile extracting them. 

You can displace a metal from its ore using carbon if...

• the metal is an oxide
• the metal is less reactive than carbon
• the metal is a sulfide
• the metal is more reactive than carbon

What are some of the properties of ceramics?

• soft, malleable, low melting point, weak, stretch easily, electrical conductor, bendy
• hard, malleable, high melting points, weak, break when stretched, electrical conductor, stiff
• soft, brittle, low melting point, strong, stretch easily, electrical insulator, bendy
• hard, brittle, high melting point, strong, break when stretched, electrical insulator, stiff

What is a polymer?

• a substance with very short molecules. A polymer molecule has identical groups of atoms, repeated few times.
• a substance with very short molecules. A polymer molecule has identical groups of atoms, repeated many times.
• a substance with very long molecules. A polymer molecule has identical groups of atoms, repeated many times.
• a substance with very long molecules. A polymer molecule has identical groups of atoms, repeated few times.