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