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
151–160 of 407 · Easy
Question 151
3 marks · Easy
Answer and see the solution →Copper is a metal and sulfur is a non-metal. Using their physical properties, answer the following:
(a)[1 mark]State the typical appearance (shiny/dull) of copper and sulfur.
(b)[1 mark]Describe whether copper and sulfur are likely to be malleable or brittle.
(c)[1 mark]Give one property of copper that makes it suitable for use in electrical wiring.
Question 152
2 marks · Easy
Answer and see the solution →The length of a copper wire needed to connect two points is 5 metres. If a non-metal such as sulfur was used to try to make a wire of the same length for carrying an electric current, would it work? Explain your answer using a physical property of metals and non-metals.
Question 153
2 marks · Easy
Answer and see the solution →When 0.1 mol of sodium oxide (a metal oxide) is dissolved in water, it produces sodium hydroxide solution, which is alkaline. When 0.1 mol of sulfur dioxide (a non-metal oxide) is dissolved in water, it forms an acidic solution. Calculate the total number of moles of hydroxide ions, OH⁻, produced from the sodium oxide, and the total number of moles of hydrogen ions, H⁺, produced from the sulfur dioxide, after complete reaction in water. State which oxide forms a solution with pH greater than 7, explaining your answer.
Question 154
5 marks · Easy
Answer and see the solution →This question is about the arrangement of electrons in atoms and representing them with diagrams.
(a)[2 marks]State what the vertical columns and horizontal rows in the Periodic Table are called.
(b)[1 mark]Phosphorus has atomic number 15. Write its electronic configuration using numbers separated by commas.
(c)[2 marks]Draw a diagram to show the arrangement of electrons in a phosphorus atom. Use circles for shells and crosses (×) for electrons.
Question 155
5 marks · Easy
Answer and see the solution →This question is about working out and interpreting electronic configurations.
(a)[1 mark]An atom has 9 electrons. Write its electronic configuration using numbers and commas.
(b)[2 marks]Below is a diagram showing the electronic configuration of an atom:
Diagram showing 2 electrons in the inner shell and 7 in the second shell. There are 2 crosses in the inner shell and 7 crosses in the second shell.
(c)[2 marks]Explain which element this atom is by giving its name and how you worked it out.
Question 156
5 marks · Easy
Answer and see the solution →This question is about calculating and understanding how to fill electron shells.
(a)[3 marks]State the maximum number of electrons that can fit in each of the first three shells for the first 20 elements.
(b)[2 marks]Calcium has atomic number 20. Calculate how its electrons are distributed in the shells. Show your working.
Question 157
5 marks · Easy
Answer and see the solution →This question is about deducing and representing electronic configurations of atoms using diagrams.
(a)[1 mark]Give the electronic configuration (using numbers) for the element with atomic number 10.
(b)[2 marks]Draw a diagram showing the arrangement of electrons in this atom, using shells and dots (•) for electrons.
(c)[2 marks]Explain why this arrangement is stable.
Question 158
1 mark · Easy
Answer and see the solution →What is the unit used to measure the amount of substance in chemistry?
Question 159
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 160
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.