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