Which of these is an indication that a chemical reaction has occurred? a. melting of a substance b. boiling of a substance c. formation of a gas d. freezing of a substance

Which describes interactions between substances and stomata during photosynthesis? check all that apply. oxygen enters stomata. oxygen is released through stomata. carbon dioxide enters stomata. carbon dioxide is released through stomata. hydrogen enters stomata. hydrogen is released through stomata.

Sodium sulfate dissolves as follows: na2so4(s) → 2na+(aq) + so42- (aq). how many moles of na2so4 are required to make 1.0 l of solution in which the na concentration is 0.10 m?

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n