Reactions of Period 3 Elements

What color flame does sodium burn with when reacting with oxygen?

• Blue

• Yellow

• White

• Pinkish-white

Which of the following elements reacts vigorously with water?

• Magnesium

• Aluminium

• Chlorine

• Sodium

What is the product formed when magnesium reacts with oxygen?

• Mg2O3

• Mg(OH)2

• MgCl2

• MgO

Which element does not react directly with oxygen?

• Phosphorus

• Sodium

• Chlorine

• Sulphur

What is the product of the reaction between phosphorus and chlorine?

• PCl5

• P2Cl4

• P4O10

• PCl3

What type of flame does sulphur produce when burned?

• Pinkish-white

• Brilliant white

• Yellow

• Brilliant blue

What is the balanced equation for the reaction of sodium with chlorine?

• 2Na + 2Cl → 2NaCl

• Na + Cl2 → NaCl

• Na2 + Cl2 → 2NaCl

• 2Na + Cl2 → 2NaCl

Which of the following elements reacts with steam to produce an oxide?

• Sodium

• Phosphorus

• Aluminium

• Silicon

What is the product formed when silicon reacts with oxygen?

• SiO

• SiCl4

• SiO2

• Si2O3

What happens when chlorine reacts with water?

• Forms H2O2

• Forms Cl2

• Forms NaCl

• Forms HCl