A gaseous mixture consists of 1.25 mol of helium, 0.36 mol of neon, and 1.58 mol of argon. 1st attempt What is the mole fraction of helium in the mixture?

Choose an element from the Group that will lose 2 electrons in order to achieve noble gas configuration? What is the group name for that element?

What are the two reservoirs that contain almost all of Earth's fresh water? A. glaciers and groundwater B. streams and estuaries C. lakes and rivers D. marshes and swamps

Describe some conditions in Antarctica that could lead to chemical weathering

An organism that died millions of years ago in a swamp would most likely become what type of resource? a. petroleum b. coal c. natural gas d. uranium

A white rooster mates with a black hen. The offspring is gray in color. What is this phenomenon called? A. codominance B. coinheritance C. incomplete dominance D. single gene dominant/recessive trait

Which term names the group of organisms able to interbreed and produce fertile offspring?

A sample of a compound contains 32.0 g C and 8.0 g H. Its molar mass is 30.0 g/mol. What is the compound's molecular formula

What is the molecular formula of the compound CH2 with molar mass = 42.0 g/mol? C4H8 C3H6 C2H4 C2H18

A gas has a volume of 27.5 L at 302 K and 1.40 atm. How many moles are in the sample of gas? A. 0.0401 mol B. 0.645 mol C. 1.55 mol D. 2.14 mol

Why does the body of the bird covered with feathers?