Chemistry quick practice

Question 1 of 10

Which of the following elements is an alkali metal?

Question 2 of 10

In which group of the periodic table is sulphur (Z = 16)?

Question 3 of 10

Balance: N₂ + H₂ → NH₃. The coefficients are

Question 4 of 10

How many moles are in 11 g of carbon dioxide? (C = 12, O = 16)

Question 5 of 10

How many electrons are in the ion N³⁻ (atomic number 7)?

Question 6 of 10

Element Y has electron configuration 2, 8, 7. It forms ions with charge

Question 7 of 10

What mass of calcium oxide is formed when 50 g of calcium carbonate is heated completely? CaCO₃ → CaO + CO₂ (Ca = 40, C = 12, O = 16)

Question 8 of 10

The solid left on the filter paper after filtration is the ___.

Question 9 of 10

The number of particles in one mole of a substance is about

Question 10 of 10

The bond formed when electrons are transferred from one atom to another is