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