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Chapter 10 Lesson 4 Grade 5

pH scale

A tool to measure for acidity and alkalinity, stands for potential for Hydrogen


A substance that tastes sour and turns blue litmus paper red


The strength of an acid


A substance that tastes bitter and turns red litmus paper blue


An electrically charged atom or molecule with unequal numbers of protons and electrons

hydronium ions

Water molecules bond with hydrogen atoms to form an acid that is positively charged (lost an electron)

hydroxide ions

Oxygen and hydrogen bond when in water to form a base that is negatively charged (gained an electron)


The strength of a base


A chemical that changes color when exposed to certain conditions, useful to identify acids and bases


A substance that forms ions when dissolved in water and conducts electricity


The chemical change of an acid and a base into a salt and water

Matthew 5:13

You are the salt of the earth. But if the salt loses its saltiness, how can it be made salty again? It is no longer good for anything, except to be thrown out and trampled by men.

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