Metal Oxides

Metal Oxides

Multiple Choice

What is a percipitate?

• solid soluble in water

• something insoluble in water

• the liquid part of a solution

• the solid part of the solution

Multiple Select

which of these will DECREASE the rate of a reaction?

• increasing the temperature

• removing the catalyst

• chopping up the solid in to smaller pieces

• decreasing the concentration

• lowering the pressure

Multiple Choice

which of these is the correct chemical equation of magnesium and oxygen? (Mg is group 2 and O is group 6)

• Mg + O $\Longrightarrow$ MgO

• Mg + O2 $\Longrightarrow$ MgO2

• 2Mg + 2O $\Longrightarrow$ 2MgO

• 2Mg +O2 $\Longrightarrow$ 2MgO

Multiple Select

which of these statements are true?

• iron is the only metal which rusts

• rusting is a chemical reaction

• rusting is a form of oxidation, like combustion

• all chemical reaction are reversible

• all metals will oxidise

Multiple Choice

why did the iron wool increase in mass?

• heat was added

• it had reacted with the air

• it had reacted with the oxygen

Multiple Choice

which of these is the most reactive?

• gold

• silver

• sodium

• potassium

• magnesium