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