Which of the following does not describe elements?

A. They are uniform throughout.

B. They can be separated by a chemical reaction.

C. They cannot be separated by physical means.

D. They are listed on the periodic table.

Which unit can be used to express the concentration of a solution

What fraction or percentage of carbon atoms has a mass of 12.011 amu?

How many moles were required to prepare 500mL of a 0.45M calcium chloride solution?

What type of element has properies unlike metal?

What are covalent compounds composed of? A. a metal and a metal B. a metal and a non metal C. a nonmetal and a nonmetal D. an alkali metal and a nonmetal

The distance from santa maria to los Alamos is 15.9 mi. what is the distance in cm?

50*12*1 over 100 slove

Radiation used in the processing of food is intended to

Chandra wants to know how many moles are contained in 150.0 g CCl4 (carbon tetrachloride). What quantity of CCl4 should she use to make this conversion? a. number of moles b. molecular mass c. molar mass d. mole ratio

The equation for the production of methane is c + 2h2 (g) → ch4 (g). how many liters of hydrogen are needed to produce 20. l of methane?