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