Why does helium raise you voice

Calcium hydride reacts with water to form hydrogen gas and calcium hydroxide. How many grams of calcium hydride are needed to generate 53.5 liters of hydrogen gas if the pressure is 814 torr at 21*C.

Which of the following is true for organisms that have two identical alleles for a particular trait? A They are hybrids. B They are homozygous. C They are heterozygous. D They are dominant.

Do electrons fill up the lowest or highest level

What is the product of (2.324 cm x 1.11 cm) expressed to the correct number of significant figures?

Calculate the average atomic mass of chlorine if 75.77% of its atoms have a mass of 34.97 amu and 24.23% of its atoms have a mass of 36.96 amu.

99pts! Which of the following best explains what happens when the kinetic energy of particles in a gas state decreases? They vibrate so quickly that the particles ionize and become plasma.

Which substance can act as an arrhenius base in an aqueous solution

What characteristic must be true of a good hypothesis

Which pair of atoms has the highest electronegativity difference? Na-F Ca-F H-F C-F F-F

How fast can a turbidite bed form? a matter of minutes a matter of seconds a matter of hours a matter of years