AQA (9-1) Topic 3

Calculate the formula mass of NaNO₃ (RAM Na=23, N=14, O=16)

James burns 0.7 g of magnesium in air. What will be the most likely mass after heating?

HCl is added to Mg in a flask. After 70 seconds all the hydrogen had been released, and there was no more Mg left. Which chemical was the limiting reagent?

Calculate the relative formula mass of calcium hydroxide (RAM Ca=40, O=16, H=1): [blank_start]74[blank_end]

0.020 moles of calcium nitrate was dissolved in 160 ml of water. Calculate the concentration: [blank_start]0.125[blank_end] mol/dm3

This equation is balanced

Balance the following equation (use the numbers 1, 2, or 3 to fill the blanks) [blank_start]1[blank_end]N2 + [blank_start]3[blank_end]H2 --> [blank_start]2[blank_end]NH3

An empirical formula is the [blank_start]simplest[blank_end] whole number ratio of [blank_start]atoms[blank_end] in a substance.

The resolution of a measuring instrument is the smallest change in a quantity that gives a change in the reading that can be seen.

The law of conservation of mass states that [blank_start]no[blank_end] atoms are lost or made during a chemical reaction so the mass of the products [blank_start]equals[blank_end] the mass of the reactants.