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