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