A) They turn blue litmus paper red. B) They do not react with metals. C) They turn red litmus paper blue. D) They taste bitter.
A) base and a salt. B) salt and water. C) acid and a base. D) acid and a metal.
A) for reactions in both open and closed systems. B) only for reactions that take place in open systems. C) for no reactions at all. D) only for reactions that take place in closed systems.
A) the substances would not mix, and you could still take two different pH readings B) the pH level of the solution would be between 3 and 11 C) the pH level of the solution would be more than 12 D) the pH level of the folution would be less than 3
A) The apple and lemon have the same pH level. B) The lemon has a higher pH than the apple. C) The apple has a lower pH than the lemon. D) The lemon has a lower pH than the apple.
A) Matter is not changed. B) Matter is not created or destroyed. C) The total mass of the reactants is less than the total mass of the products. D) The total mass of the reactants if greater than the total mass of the products.
A) Phase Change-physical change B) Phase Change-chemical change C) Exothermic reaction-physical change D) Endothermic reaction-physical change
A) endothermic reaction-chemical change B) Exothermic reaction-chemical change C) exothermic reaction-physical change D) endothermic reaction-physical change
A) reacts with hydrochloric acid to release hydrogen gas B) does not burn when a flame is applied C) has a long narrow shape with a smooth texture D) rusts
A) a tree branch breaking B) a tree burning after a lightning strike C) steam rising from pavement D) water freezing in a pond
A) electromagnetic change B) chemical change C) physical change D) color change
A) exactly equal to the total mass of the products. B) unrelated to the total mass of the products. C) greater than the total mass of the products. D) less than the total mass of the products.
A) precipitate. B) shape change. C) a change in color. D) mass change.
A) has a pH above 7 and tastes sour. B) turns red litmus paper blue. C) has a pH above 7 and tastes bitter. D) has pH lower than 7 and taste sour.
A) It is most effective in a highly acidic environment. B) It is most effective in a slightly basic environment. C) It is most effective in a highly basic environment. D) Is it most effective in a slightly acidic environment.
A) reactivity B) the ability to reflect light C) melting point D) conductivity
A) rusting B) melting C) corroding D) burning
A) water turning into steam B) frying an egg C) ice melting D) coal burning
A) melting ice B) breaking a toothpick in half C) toasting a marshmallow D) boiling water
A) an electron B) a mixture C) a compound D) an atom
A) Not all of the products and reactants could be measured because the chemical reaction took place in an open system. B) The chemical reaction did not work as expected because it took place in a closed system. C) The chemical reaction destroyed matter. D) The chemical reaction created matter.
A) energy is being absorbed by the reaction. B) an exothermic reaction is occuring. C) no reaction is taking place. D) matter is being released.
A) C B) D C) B D) A
A) an electron B) a compound C) a mixture D) an atom
A) Sodium loses seven electrons and chlorine gains seven electrons. B) Sodium gains seven electrons and chlorine loses seven electrons. C) Sodium loses one electron and chlorine gains one electron. D) Sodium gains one electron and chlorine loses on electron.
A) It is a new element because a chemical change took place. B) It is a mixture because each ingredient kept its original properties. C) It is a new chemical compound because a physical change took place. D) It is a solution because the ingredients cannot be separated.
A) Citrus Fruit (pH 2-3) B) Baking Soda (pH 8-9) C) Water (pH 6-7) D) Dairy (pH 5-7)
A) a product. B) a reactant. C) a solute. D) a solvent.
A) negatively charged. B) positively charged. C) very basic. D) very acidic.
A) ham B) green beans C) cheddar cheese D) apples
A) a mixture. B) a solute. C) a suspension. D) a solvent.
A) indicator B) acid C) base D) litmus paper
A) True B) False
A) Chemical change because a precipitate formed. B) Chemical change because the mass stayed the same. C) Physical change because a precipitate formed.. D) Physical change because a new substance formed.
A) True B) False |