Needed for most chemical reactions and makes up of 70% of cells.

A. Water

B. Air

C. Food

D. Living space

E. Carbohydrates

If mass = 180kg and volume = 90m3, what is the density

When sugar is added to a sugar solution, the sugar does not dissolve. Which term describes the original sugar solution? O A. Semisaturated O B. Supersaturated C. Saturated D. Unsaturated

Which of the folowing is true about radio waves? ☹They have short wavelenghts ☹They can penetrate dust clouds ☹They reveal hot gases ☹They have high energies

A chemistry student must write down in her lab notebook the concentration of a solution of potassium chloride. The concentration of a solution equals the mass of what's dissolved divided by the total volume of the solution.

Is a compound considered a pure substance? Why or why not?

Obtaining scientific data from a distance is called?

What is organic chemistry?

What is the total number of electrons shared in a double covalent bond between two atoms? (1) 1 (3) 8 (2) 2 (4) 4

Which method separates mixtures according to the rates their components travel through a material? yhaoo answers?

How many protons are in the nucleus of the isotope in-115?