How many times is CO2 denser than H2?

A 22 times

B 1.96 times

C 0.089

D they have the same density because they are both gases

E cannot be calculated

The pressure of a 70.0L sample of gas is 600 mm Hg at 20.0C. If the temperature drops to 15.0C and the volume expands to 90.0L, what will the pressure of the gas be?

List four ways that scientific information is communicated to the general public

Digestion starts in the mouth. What two digestive processes occur there?

Energy is required for chemical reactions take place. What type of energy is used in cooking?

For a solar eclipse to occur,

Which of the following is diamagnetic? A) Sn B) Pb 2+ C) I D) N E) All are paramagnetic

Based on your observations in the lab, what do you think happens to the majority of water (not, ice) at the poles? at the equator?

How do organisms interact with each other and how can one organism be dependent upon other species

Check Sodium inside a star is most likely formed by which process? fission fusion <<--? alpha emission Beta emission

Which of these is the main goal of any titration? to observe the effect of indicators on acids to observe the effect of indicators on bases --> (((to determine the concentration of one of the reactants))) <--- to determine the effects of a base on