A) None of these B) Physical change C) Chemical change
A) None of these B) Chemical change C) Physical change
A) Physical change B) None of these C) Chemical change
A) False B) True C) None of these
A) Chemical change B) None of these C) Physical change
A) Physical change B) Chemical change C) None of these
A) Physical change B) Chemical change C) Both physical and chemical changes
A) Physical change B) both physical and chemical change C) Chemical change
A) False B) True
A) This was a chemical change because a solid formed in the solution. B) This is NOT a chemical reaction because we just mixed together two liquids. Dissolving is a physical change.
A) One of the new chemicals that formed was a solid. B) Gas was produced in the chemical reaction. C) A color change took place. D) A physical change took place
A) rusting iron B) melting ice C) burning wood D) when food rots
A) burning coal B) chopping onions C) dynamite exploding D) digesting food
A) chemical B) combustion C) physical
A) zinc chloride and hydrogen B) hydrochloric acid and hydrogen C) zinc and hydrogen D) zinc and hydrochloric acid
A) carbon and water B) sugar C) sugar, carbon and water D) heat
A) carbon and water B) sugar, carbon and water C) heat D) sugar
A) manganese dioxide & hydrogen peroxide B) hydrogen peroxide and oxygen C) manganese dioxide and oxygen D) oxygen
A) sodium carbonate + water --> sodium hydroxide + carbon dioxide B) sodium hydroxide + carbon dioxide --> sodium carbonate + water C) sodium hydroxide + carbon dioxide + sodium carbonate --> water D) none of the answers are correct
A) none of the answers are correct B) barium nitrate <-- sulfuric acid + barium sulfate + nitric acid C) barium sulfate + nitric acid --> barium nitrate + sulfuric acid D) barium nitrate + sulfuric acid --> barium sulfate + nitric acid
A) a change of state B) oxygen gas is produced C) change in temperature D) none of these are correct
A) gas formation B) increase in temperature C) precipitate formation D) none of these are correct.
A) the products were liquid water and solid sodium chloride B) none of the answers are correct. C) a precipitate was the reactant D) hydrogen could possibly be a product in this reaction
A) hydrogen B) carbon dioxide C) hydrogen or oxygen D) oxygen
A) hydrogen B) oxygen C) carbon dioxide D) oxygen or hydrogen
A) carbon dioxide B) oxygen C) marble chips D) hydrochloric acid E) hydrogen |