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