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