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