What happens to the number of valence electrons when a metal element forms a compound?

Which of the following is a mixture? A. sugar B. water C. soil D. salt

Diffraction is when light is bent around obstructions. Which of the these observation about clouds would indicate diffraction? A) After rain storms, you can sometimes see rainbows. B) Clouds are white or gray and cannot be seen through.

When a scientist serves in an advisory role to society, he or she must

How many grams of hydrogen gas will be produced when you react 40.0 grams of sodium with 25.0 grams of water?

Suppose that a 0.2 g/mL solution of (S) - ibuprofen in a 2 dm long cell rotates plane-polarized light + 10°. What is the specific rotation for (S) - ibuprofen?

To what chemical reaction class does this reaction belong? 2 mg (s) + o2 (g) 2 mgo (s)

Which best illustrates how particle arrangement changes when solids change into liquids

Express in scientific notation (6.0x10^4) (3.1x10^-1)

How do you measure the mass of a liquid?

Given the following information, calculate the mass for B-11. B-10 has a natural abundance of 19.9 percent, while B-11 has a natural abundance of 80.1 percent. The mass of B-10 is 10.013 amu.