A) None of these B) Chemical change C) Physical change
A) Chemical change B) Physical change C) None of these
A) Chemical change B) None of these C) Physical change
A) False B) True C) None of these
A) Chemical change B) Physical change C) None of these
A) Physical change B) None of these C) Chemical change
A) Chemical change B) Both physical and chemical changes C) Physical change
A) Physical change B) Chemical change C) both physical and chemical change
A) False B) True
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) One of the new chemicals that formed was a solid. B) A color change took place. 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) digesting food B) dynamite exploding C) chopping onions D) burning coal
A) combustion B) chemical C) physical
A) hydrochloric acid and hydrogen B) zinc and hydrochloric acid C) zinc and hydrogen D) zinc chloride and hydrogen
A) carbon and water B) sugar C) sugar, carbon and water D) heat
A) sugar B) heat C) carbon and water D) sugar, carbon and water
A) manganese dioxide & hydrogen peroxide B) hydrogen peroxide and oxygen C) manganese dioxide and oxygen D) oxygen
A) sodium hydroxide + carbon dioxide --> sodium carbonate + water B) sodium hydroxide + carbon dioxide + sodium carbonate --> water C) sodium carbonate + water --> sodium hydroxide + carbon dioxide 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) oxygen gas is produced B) a change of state C) none of these are correct D) change in temperature
A) increase in temperature B) none of these are correct. C) precipitate formation D) gas formation
A) a precipitate was the reactant B) the products were liquid water and solid sodium chloride C) hydrogen could possibly be a product in this reaction D) none of the answers are correct.
A) carbon dioxide B) hydrogen C) oxygen D) hydrogen or oxygen
A) hydrogen B) oxygen or hydrogen C) oxygen D) carbon dioxide
A) hydrogen B) carbon dioxide C) marble chips D) hydrochloric acid E) oxygen |