A) Physical change B) None of these C) Chemical change
A) Chemical change B) None of these C) Physical change
A) None of these B) Physical change C) Chemical change
A) True B) False 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) 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) 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) when food rots B) rusting iron C) melting ice D) burning wood
A) digesting food B) burning coal C) chopping onions D) dynamite exploding
A) combustion B) chemical C) physical
A) hydrochloric acid and hydrogen B) zinc and hydrogen C) zinc and hydrochloric acid D) zinc chloride and hydrogen
A) sugar, carbon and water B) heat C) carbon and water D) sugar
A) heat B) carbon and water C) sugar D) sugar, carbon and water
A) hydrogen peroxide and oxygen B) manganese dioxide & hydrogen peroxide C) oxygen D) manganese dioxide and oxygen
A) none of the answers are correct B) sodium carbonate + water --> sodium hydroxide + carbon dioxide C) sodium hydroxide + carbon dioxide --> sodium carbonate + water D) sodium hydroxide + carbon dioxide + sodium carbonate --> water
A) barium nitrate <-- sulfuric acid + barium sulfate + nitric acid B) barium sulfate + nitric acid --> barium nitrate + sulfuric acid C) none of the answers are correct 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) precipitate formation C) none of these are correct. D) gas formation
A) the products were liquid water and solid sodium chloride B) hydrogen could possibly be a product in this reaction C) none of the answers are correct. D) a precipitate was the reactant
A) oxygen B) hydrogen C) carbon dioxide D) hydrogen or oxygen
A) oxygen or hydrogen B) carbon dioxide C) hydrogen D) oxygen
A) oxygen B) carbon dioxide C) hydrochloric acid D) marble chips E) hydrogen |