Chemical Reactions Review Crossword Puzzle

QUESTIONS LIST:

• neutralisation: a reaction where an acid and an alkali cancel each other out.
• ph: the scale used to measure how acidic or alkaline a substance is.
• indicator: a substance that changes colour in acids and alkalis.
• acid: a substance with a ph less than 7.
• alkali: a soluble base with a ph greater than 7.
• salt: a product formed in acid reactions, often with water and another substance.
• water: formed along with salt in a neutralisation reaction.
• metal: reacts with acids to produce a salt and hydrogen gas.
• carbonate: reacts with acids to produce a salt, carbon dioxide and water.
• carbon dioxide: a gas made when acids react with metal carbonates — turns limewater cloudy.
• exothermic: a reaction that releases heat energy to the surroundings.
• endothermic: a reaction that absorbs heat energy from the surroundings.
• physical: a change where the substance stays the same, just changes state or appearance.
• bond: these must be broken and made during a chemical reaction.
• reactants: the substances you start with in a chemical reaction.
• products: the new substances made in a chemical reaction.