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