2. Which gas is NOT an efficient greenhouse gas? A. Helium

B. Methane

C. Carbon dioxide

D. Water vapor

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

Ahydrogen atom has 1 electron. how many bonds can hydrogen form? a) 1 b) 2 c) 3 d) 4 e) 5

Which statement correctly identifies the scientific question and describes why the question is scientific? question 1 refers to the supernatural.question 2 reflects a moral or social value.question 3 refers to something that can be measured.question 4 reflects a question that can’t be observed.