Chemical Changes...C5. 4.0 / 5 based on 1 rating ? ChemistryExtracting metals /The reactivity seriesGCSEAQA Created by: cieran_10Created on: 20-06-18 17:10 What are acids? Substances that produce hydrogen ions when added to water. 1 of 13 What is formed when a substance is dissolved in water? An aqueous solution. 2 of 13 What do excess hydrogen ions do to a soltion? Make it more acidic. 3 of 13 What is the pH value of a strong acid? 1. 4 of 13 What neutralises acids? Bases. 5 of 13 Name two bases. Metal hydroxides and metal oxides. 6 of 13 What are alkalis? Bases that dsissovle in water, to form alkaline solutions. 7 of 13 What are alkalis an example of? Soluble hydroxides. 8 of 13 What ions do alkalis form? They produce hydroxide ions. 9 of 13 In an aqueous solution, what does HCl ionise completely into? Hydrogen and chloride ions. 10 of 13 What are strong acids? Ones that ionise completely in aqueous solutions. 11 of 13 What happens when ethanoic acids dissvoles in water? It does not ionise completely and the ehthanoic acid molecules remain as molecules in the soltion. 12 of 13 How can you calculate the pH value of a solution from its concentration of hydrogen ions? By counting the number of 0s before and after the decimal point 13 of 13
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