2) Which of the following is a true statement?

A: All the atoms of an element must be identical.

B: Compounds may be separated by physical means.

C: Mixtures may not be separated.

D: Homogeneous is one type of compound.

A nurse used a 0.02-mg/L solution of disinfection to clean a patients wound. What is the concentration of the solution expressed as a percentage?

One of the main characteristics Of a solid is that they__.

Select the correct answer. What effect will the number of particles and temperature have on the rate of diffusion of gas molecules? A. The rate of diffusion decreases with the increase in number of particles and temperature. B.

Which element's atomic radius changes the most in size when it becomes ionized?

What causes lightning? a) thunder b) an electric discharge c) rising warm air d) air masses meeting

In the reaction, Zn + HCl-> ZnCl2 + H2, 25 grams Zn are reacted with 17.5 grams HCl. How many grams of H2 will be produced? A. 0.382 g of H2 B. 0.479 g of H2 C. 0.7865 g of H2 D. 0.484 g of H2

Is nail varnish soluble?

What is the periodic trend for atomic size from top and bottom in a group? From left to right in a period?

Which planets' orbits is the belt located between the main asteroid belt?

For the baeyer-villiger oxidation of cyclohexyl methyl ketone