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