Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Principles of Chemistry
991 practice questions
Topics covered
- States of Matter102 practice questions
- Elements, Compounds and Mixtures69 practice questions
- Atomic Structure108 practice questions
- The Periodic Table103 practice questions
- Chemical Formulae, Equations and Calculations Part 119 practice questions
- Chemical Formulae, Equations and Calculations Part 2144 practice questions
- Ionic Bonding143 practice questions
- Covalent Bonding68 practice questions
- Metallic Bonding19 practice questions
- Electrolysis198 practice questions
Practice questions
381–390 of 991
Question 381
7 marks · Hard
Answer and see the solution →This question is about electronic configurations and differences in electrical conductivity between metals and non-metals.
(a)[2 marks]Draw a diagram to show the electronic configuration of the element with atomic number 6. Use shells and electrons as dots or crosses.
(b)[2 marks]Element X has the electronic configuration 2,8,1. Identify whether X is a metal or a non-metal. Explain your answer based on its electronic configuration.
(c)[2 marks]Describe how the electrical conductivity of sodium compares to that of sulfur. Give a reason for your answer linked to their electronic structures.
(d)[1 mark]Name one exception among non-metals that can conduct electricity and explain why it is an exception.
Question 382
8 marks · Hard
Answer and see the solution →This question is about the arrangement of electrons in atoms and the physical properties of metals and non-metals.
(a)[2 marks]Draw a diagram to show the electronic configuration of an atom of nitrogen (atomic number 7) using shells and dots or crosses to represent electrons.
(b)The atomic number of magnesium is 12, and the atomic number of oxygen is 8. Both elements are found in the same period of the Periodic Table.
(i)[1 mark]State whether magnesium is a metal or a non-metal.
(ii)[1 mark]State whether oxygen is a metal or a non-metal.
(c)[2 marks]Describe two physical properties that can be used to distinguish a typical metal such as magnesium from a typical non-metal such as oxygen.
(d)[2 marks]Name one exception to the typical properties of metals or non-metals, as described in this question.
Question 383
1 mark · Easy
Answer and see the solution →What is the unit used to measure the amount of substance in chemistry?
Question 384
3 marks · Easy
Answer and see the solution →A student reacts 8.0 g of hydrogen with excess oxygen to make water, according to the equation:
The student obtains 70.0 g of water. (Ar: H = 1, O = 16)
(a)[2 marks]Calculate the maximum mass of water that could be formed from 8.0 g of hydrogen.
(b)[1 mark]Calculate the percentage yield of water.
Question 385
2 marks · Easy
Answer and see the solution →A compound contains 2.70 g of aluminum and 4.80 g of chlorine. (Ar: Al = 27, Cl = 35.5)
Calculate the empirical formula of this compound.
Question 386
2 marks · Easy
Answer and see the solution →A student heats a crucible containing a strip of magnesium in air and finds an increase in mass after the reaction.
Explain why the mass increases, and how this method helps to determine the formula of magnesium oxide.
Question 387
3 marks · Easy
Answer and see the solution →The following table shows substances involved in a chemical reaction:
Substances in the reaction between iron(III) oxide and carbon monoxide Substance State Symbol iron(III) oxide carbon monoxide iron carbon dioxide Complete the table with the correct state symbols and write the balanced chemical equation including state symbols for the reaction where iron(III) oxide reacts with carbon monoxide to produce iron and carbon dioxide.
(a)[1 mark]Complete the table with the correct state symbols.
(b)[2 marks]Write the balanced chemical equation for this reaction, including state symbols.
Question 388
1 mark · Easy
Answer and check →State the relative formula mass (Mr) of water, H2O. (Ar: H = 1, O = 16)
Question 389
3 marks · Easy
Answer and see the solution →Answer the questions about carbon dioxide, CO2.
(a)[1 mark]State the relative atomic masses (Ar) for C and O.
(b)[1 mark]Calculate the relative formula mass (Mr) of CO2.
(c)[1 mark]What is the mass of 0.25 mol of carbon dioxide?
Question 390
2 marks · Easy
Answer and see the solution →Calculate the number of moles in 12.0 g of magnesium oxide, MgO. (Ar: Mg = 24, O = 16)