If oxygen is removed from a sample of air as iron rusts, what happens to the partial pressure of oxygen in the air? a it increases b it decreases or c stays the same

Iknow #2 is d. i just need to know why

Which element forms an ionic bond with flourine? 1) fluorine 2) carbon 3) potassium 4) oxygen

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.