OP Y12 Mole chemistry test 18/10/2023

Calcium reacts with dilute nitric acid to form calcium nitrate and hydrogen. Which is the balanced equation for this reaction?

• Ca + 2HNO₃ --> Ca(NO₃)₂ + H₂

• Ca + H₂NO₃ --> CaNO₃ + H₂

• Ca + 2H₂NO₃ --> Ca(NO₃)₂ + 2H₂

• 2Ca + 2HNO₃ --> 2CaNO₃ + H₂

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-2

What mass of anhydrous sodium carbonate is needed to make 50.0 cm³ of a 0.0800 mol dm^-3 solution of sodium carbonate, Na₂CO₃?

• 0.332 g

• 0.424 g

• 5.30 g

• 8.48 g

What is the maximum volume of hydrogen formed, at room temperature and pressure (r.t.p.), when 0.207 g of lithium is added to excess water?

2Li(s) + 2H₂O(l) --> 2LiOH(aq) + H₂(g)

• 0.36 dm³

• 0.72 dm³

• 1.44 dm³

• 2.48 dm³

Tags

NGSS.HS-PS1-2

What is the relative formula mass of hydrated barium hydroxide, Ba(OH)₂.8H₂O

• 171.3

• 203.3

• 299.3

• 315.3

Tags

NGSS.HS-PS1-7

An 11.0 g sample of anhydrous sodium sulphate, Na₂SO₄, is dissolved in deionised water to form 70 cm³ of solution.

What is the concentration in mol dm^-3, of Na₂SO₄ in the aqueous solution formed?

• 0.0011

• 0.90

• 1.1

• 900

Barium chloride reacts with sodium sulphate

BaCl₂(aq) + Na₂SO₄(aq) --> BaSO₄(s) + 2NaCl(aq)

What would you see when this reaction is carried out?

• blue solution turns colourless

• effervescence

• no visible change

• white precipitate

Barium chloride reacts with sodium sulphate

BaCl₂(aq) + Na₂SO₄(aq) --> BaSO₄(s) + 2NaCl(aq)

What is the ionic equation for this reaction?

• Ba⁺(aq) + SO₄^-(aq) --> BaSO₄(s)

• Na⁺(aq) + Cl^-(aq) --> NaCl(aq)

• Ba²⁺(aq) + SO₄^2-(aq) --> BaSO₄(s)

• Ba²⁺(aq) + SO₄^2-(aq) + Na⁺(aq) + Cl^-(aq) --> BaSO₄(s) + NaCl(aq)

Tags

NGSS.HS-PS1-7

Barium chloride reacts with sodium sulphate

BaCl₂(aq) + Na₂SO₄(aq) --> BaSO₄(s) + 2NaCl(aq)

What is the maximum mass of BaSO₄ that could be produced from 0.500 g of BaCl₂ in this reaction?

• 0.446 g

• 0.500 g

• 0.560 g

• 0.821 g

Tags

NGSS.HS-PS1-7

Barium chloride reacts with sodium sulphate

BaCl₂(aq) + Na₂SO₄(aq) --> BaSO₄(s) + 2NaCl(aq)

What is the atom economy (by mass) for the formation of BaSO₄ in this reaction?

• 33.3%

• 62.2%

• 66.6%

• 80.0%

Tags

NGSS.HS-PS1-7

There are 6.02 x 20²³ atoms in 0.25 mol of

• He

• H₂O

• BH₃

• CH₄