How could you tell if a sample of matter is an element

A mass of 12.0g of carbon contains what?

Which is required for karst topography to form? A. Mass wasting B. Magma C. Pure water D. Chemical weathering

Use the relative size of the 3s orbital below to answer the following questions about orbitals A-D. (a) Which orbital has the highest value of n? (b) Which orbital (s) have a value of l = 1? l = 2?

In swimming, you apply a force to the water to move yourself forward. The greater the water pressure, the faster you can swim.

What type of chemical reaction is 2h202 (1) to 2h20 (1) + 02 (g)

Why does a higher concentration make a reaction faster? There are more collisions per second and the collisions are of greater energy. Collisions occur with greater energy. There are more collisions per second.

A property of metals is high thermal conductivity which is

Do exorthermic reactions make surrounding hotter?

What's a certain indicator that a molecule is polar?

If an electron fell to a lower orbit or energy level, energy would be a. created. b. emitted. c. absorbed. d. transferred.