S2 Physical science

• Atoms P and Q are isotopes of the same element.

• Atom P has the electronic configuration 2,3

• Atom Q is boron

• The nucleon number of atom P is 9.

• 0.40kg

• 0.50kg

• 0.65kg

• 0.80kg

balance the equation by giving the values of a ,b and c

• a = 2 b= 2 c=1

• a=1 b= 1 c= 1

• a=2 b=3 c= 2

• a = 2 b=3 c = 1

• 42

• 72

• 88

• 124

calculate the mass of sodium oxide produced by 20g of sodium correct to 2 decimal places

_{Ar [ Na 23, O 16]}

• 26.96

• 27

• 107.88

• 56

calculate the volume of hydrogen gas produced in room temperature and pressure when 2.0 kg of potassium is reacting with water.

• 0.615 dm³

• 0.001 dm³

• 24dm³

• 0.7dm³

calculate the volume of hydrogen gas produced in room temperature and pressure when 2.0 kg of potassium is reacting with water.

• 0.615 dm³

• 0.001 dm³

• 24dm³

• 0.7dm³

calculate M_r of aluminium oxide

• 101

• 99

• 98

• 102

calculate the volume of 20moles of ammonia at room temperature

• 480dm³

• 1,2 dm³

• 48 dm³

• 24dm³

calculate the number moles of 45g of calcium oxide

• 0.703 moles

• 0.803 moles

• 1.3 moles

• 2.3 moles