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