Why is carbon considered tetravalent?

What is the percent mass/volume and molarity of sodium chloride solution, if 2.0grams of salt is collected by evaporating from 30.0ml of sodium chloride solution?

Which of the following best describes what causes the phases of the moon? The alignment of the sun, Earth, and moon The speed of the moon around the Earth The speed of the Earth around the sun The alignment of the planets

List 2 Homogeneous mixtures and explain how that are homogeneous

Determine how many significant figures are in each measurement. (9pts) 0.0908 340.02 5420 12.90 3.09 x 108 0.79 0.02050 0.009 4709

True or False: Heterotrophs obtain food molecules for energy and nutrition by eating heterotrophs or by eating and absorbing autotrophs

The vapor pressure of benzene (C6H6) is 73.0 mm Hg at 25 °C. What is the vapor pressure of a solution consisting of 179 g of benzene and 0.217 mol of a nonvolatile nonelectrolyte?

Aldo drove 420 miles using 18 gallons of gas. at this rate, how many gallons of gas would he need to drive 357 miles

How many grams of As2S3 are in 3.25 moles?

How does a solid turn into a liquid

What does the Ka represent in the equation and why is it important?