What is a physical change?, A) A change where new substances are formed, B) A change in shape or state with no new substances, C) A reaction that produces gas bubbles, D) Burning of paper, Which is an example of a chemical change?, A) Melting ice, B) Burning wood, C) Cutting paper, D) Dissolving sugar in water, What does "reversible" mean in changes?, A) Can be undone, like unfolding crumpled paper, B) Cannot be undone, like burning ashes, C) Always produces new smells, D) Involves heat only, What is combustion?, A) A physical change with oxygen, B) A chemical reaction usually between fuel and oxygen, C) Melting of wax, D) Breaking into pieces, Reactants are..., A) Substances produced after a reaction, B) Substances before a reaction, C) Only gases in equations, D) Always reversible, Products are..., A) Starting materials in a reaction, B) New substances formed after a reaction, C) Only solids, D) Indicators of change, Which is NOT an indicator of chemical reaction?, A) Colour change, B) Odour change, C) Shape change, D) Gas formation, Rotting fruits is a..., A) Physical change, B) Chemical change, C) Reversible process, D) State change only, Burning a candle involves..., A) Only physical change, B) Only chemical change, C) Both physical and chemical changes, D) No changes, What is an indicator?, A) Evidence of a chemical reaction, B) A reactant in equations, C) A physical shape, D) A type of fuel, In the word equation Wax + Oxygen → Carbon dioxide + Water vapour, what are the products?, A) Wax and Oxygen, B) Carbon dioxide and Water vapour, C) Only Wax, D) Only Oxygen, Why is crumpling paper a physical change?, A) It forms new substances, B) It is irreversible, C) No new substances are formed, and it can be reversed, D) It produces gas, What indicator shows in heated sugar?, A) Gas bubbles, B) Colour change from white to brown and odour change, C) Temperature decrease, D) Shape change only, For charcoal burning, the word equation is..., A) Charcoal + Water → Carbon dioxide, B) Carbon + Oxygen → Carbon dioxide, C) Charcoal + Ash → Oxygen, D) Water + Oxygen → Charcoal, Vinegar + bicarbonate of soda shows which indicators?, A) Colour change and odour, B) Light emission, C) Only shape change, D) Gas formation (bubbles) and temperature decrease, Rusting iron involves..., A) Iron + Oxygen + Water → Rust, B) Iron → Water + Oxygen, C) Only physical colour change, D) Reversible process, Why is opening a fizzy drink NOT a chemical change?, A) It produces new substances, B) It changes odour, C) Bubbles are from dissolved gas escaping, no new substance, D) It is irreversible, In catalytic converters, chemical reactions..., A) Produce more harmful gases, B) Change harmful substances to less harmful ones, C) Are physical changes, D) Involve only colour change, Black smoke from cars indicates..., A) Complete combustion, B) Physical change, C) Incomplete combustion producing soot, D) No reaction, Tim should throw away fruits based on..., A) Shape only, B) Reversible changes, C) Colour change and odour change, D) Gas bubbles, Why can't rotting fruits be reversed?, A) It's physical and reversible, B) No indicators are present, C) Only state changes occur, D) New substances with different properties are formed, In incomplete combustion, what extra product might form?, A) Only water vapour, B) Soot or carbon monoxide, C) More oxygen, D) Reversible ash, How does the vinegar + bicarbonate reaction demonstrate an endothermic process?, A) Temperature increases, B) Temperature decreases, absorbing heat, C) No temperature change, D) Only gas is produced, Predict the word equation for toasting bread (simplified chemical part)., A) Bread + Water → Carbon dioxide, B) Carbohydrates + Oxygen → Carbon dioxide + Water + Other compounds, C) Bread → Oxygen only, D) No equation needed, Why is mixing inks a physical change, even with colour blending?, A) New substances form, B) Produces heat, C) It's irreversible, D) It can be separated back, no new substances, In the chapter activity, why wave the smell towards your nose when heating sugar?, A) To make it reversible, B) To see colour change, C) For safety, avoid smelling directly, D) To feel temperature, How do preservatives in food relate to chemical changes?, A) They slow down chemical reactions like rotting, B) They speed up reactions, C) They cause physical changes only, D) They produce gas, If a reaction shows no colour or odour change but bubbles, is it chemical?, A) No, always physical, B) Yes, gas formation indicates new substance, C) Only if reversible, D) Only if exothermic, Why is burning both exothermic and a combustion reaction?, A) It absorbs heat, B) It's reversible, C) It releases heat and involves fuel + oxygen, D) No new products, In rusting, why is water a reactant?, A) It's not needed, B) It helps iron react with oxygen to form hydrated iron oxide, C) It makes it physical, D) It produces odour only

G.6 Science - Ch.7 Chemical Changes

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