When a molecule is polar what does that mean?

If a rock initially contained 10 milligrams of a radioactive substance when it first formed, how much remains after 4 half-lives?

A covalent bond in which electrons are shared unequally is a. polar. b. a double bond. c. ionic. d. polyatomic.

In the equation Mg (s) + O2 (g) → MgO (s) what is the reactant?

The Big Bang is responsible for the formation of two elements found in our universe, hydrogen and helium. The rest of the elements are created by stars during the various stages in their life cycle. A. True B. False

When it says Lithium crystallizes in a body centered cubic unit cell. what is the mass of one unit cell ... I did my math, but it says I have to multiply by 2.

if carbon which has an electrongavity of 2.5 bonds with hydrogen, which has an electrongavity of 2.1, the bond between the two atoms will be classified as a (n) covalent bond

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products? A. 12 atoms of carbon (C) B. 6 atoms of carbon (C) C. 3 atoms of carbon (C) D. 2 atoms of carbon (C)

Car Q and z are put though an endurance test to see if they can travel at 120 km/h for 5.0 hours. Each car has a 45-L fuel tank. Car z must stop to refuel after traveling for 4.2 hours. Car Q, however, travels for 5.4 hours before running out of gas.

What happened to the atoms in the heated metal ball so that it didn't fit through the ring?

A 3.00 L flexible container holds a sample of hydrogen gas at 153 kPa. If the pressure increases to 203 kPa and the temperature remains constant, what will the volume be?