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