Calculate the concentration of this solution in g dm−3. Give your answer to three significant figures. (Total for question = 3 marks) Edexcel Chemistry GCSE - ...

What is Avagrado's number? 2. How many atoms are there in one mole of any element? 3. If I had one mole of hydrogen molecules (H​2​. ) ...

You try: 1. Calculate the concentration of a solution made from 10g of sodium hydroxide and. 200 dm3 of water. 2. What is the concentration of a solution ...

Calculations for KS4 Chemistry - Worksheet. You will need a copy of the Periodic Table to complete these questions. 1. Find the Ar (relative atomic mass for ...

Q4: In a mole of one substance and in the mole of another, is the number of particles, atoms, molecules or ions the same, less or more? A= the same.

Q12: How is the concentration of a solution measured? (2 marks). Q13: Write this in an equation form, including the units. Concentration = (2 marks).

Answer the following questions: 1). How many moles are in 25.0 grams of water? 2). How many grams are in 4.500 moles of Li2O? 3). How many molecules are in 23.0 ...

What is the law of conservation of mass? 2. Why might some reactions appear to show a change in mass? 3. Give two examples of a reaction where a change in ...

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Information. • There are 100 marks available on this paper. • The marks for questions are shown in brackets. • You are expected to use a calculator where ...