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