Whats the defenition of elements? I know what it means but I cant explain it lol

If oxygen were collected over water at 293 K and the totalpressure of the wet gas were 670 mmHg, what would be the partialpressure of the oxygen?

Which electrons in an atom have the highest energy? a. the valence electrons b. the core electrons c. the s orbital electrons d. the p orbital electrons -apex

In the following question, select the odd word from the given alternatives. A. Coal B. Diesel C. Electricity D. Kerosene

The lab procedure mentions that not all of the oxone may dissolve after being added to the water because the water may be saturated. Which statement best explains this: (A) There are less solute molecules than water molecules.

Electrolysis uses electrical current to break water molecules in to oxygen gas and hydrogen gas. how do you know that this is a chemical change? A. their is a phase change from liquid to gas B. it is a single replacement action C.

A man is about to receive a bone marrow transplant. He is taking pills to suppress his immune system so that: A. his immune system does not attack the transplanted marrow. B. his immune system can recover after surgery. C.

Nickel (ii) chloride dissolves in water to form a light green solution. what ions are present in solution-that is, what is "swimming around" in the aqueous solution? write the formulas

Calcium sulfide forms when calcium loses 2 valence electrons to sulfur. What type of a bond is formed? Select one of the options below as your answer: A) covalent B) ionic

What ability is most valuable for survival in the deep ocean

Increase Crop Production food Engineers combine two plants so that each plant strength compensates for the others weakness what is this technique called