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