Urgent please help: Which statement best describes evidence that a chemical reaction occurred in the investigation conducted by Miss Parker's class?

A: The mass of the vinegar and baking soda increased

B: the mass of the vinegar and baking soda decreased

C: the baking soda mixed with a vinegar and release a gas

D:the baking soda mix with the vinegar and absorbed heat energy

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

Achemist 16 drop copper metal from copper chloride solution. the chemist place is 0.50 g of aluminum foil in a solution containing 0.75 g of copper (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction?

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.