Which of the following is not a phase change?

a. sublimation

b. melting

c. diffusion

d. vaporization

6. What are the spiral arms of the Milky Way made of?

If an unknown element didplays many extremly strong metallic properties, where is it most likely to be located on the periodic table? a: far right b:along the stair step c:middle d:far left

How did Thomson discover the electron?

What two quantities must be known to calculate the density of a sample of matter? a. mass and volume b. length and mass c. size and weight d. weight and volume

The gain of electrons by the chlorine atoms forms the __ ion

Calculate the formula mass of ethanol, c2h5oh. express your answer to three significant figures and include the appropriate units.

What are the four classifications of matter? of those four, which two are pure substances?

Which relationship or statement best describes delta s for the following reaction: 2H2S (g) + 3O2 (g) - -> 2H2O (g) a) Delta S = 0 b) Delta S < 0 c) Delta S> 0 d) Delta S = Delta H |T e) More information is needed to make a reasonable prediction.

Which of the following subatomic particles are found outside of the nucleus?

How many atoms does a molecule of sodium chloride contain?