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