Use the values of A, which follow to answer the questions below.
H=1; C = 12; N= 14; O = 16; Ne = 20; Na = 23;
Mg = 24; S = 32; K= 39; Fe = 56; Cu= 63.5; Zn = 65.
One mole of any gas at rtp occupies 24 dm3.
1 Calculate the number of moles in:
a 2g of neon atoms
b 4g of magnesium atoms
( 24g of carbon atoms.

When a comet collides with earth, it adds material to our planet and causes great damage. therefore, a collision like this is a a. destructive force b. constructive force c. geologic process and event d. constructive and destructive force

In apex! a liquid heated beyond a certain temperature becomes

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.