How has the composition of the atmosphere changed overtime?

Explain why metals are good electrical conductors

A dad and his son are driving down the street then wreck, the dad died but the son has to go to the hospital because of his serious injuries. When the operation was about to start the doctor walked in and said "I cant operate on him he's my son".

White light is made up of A. only the types of visible light with very long wavelengths. B. ultraviolet light and gamma rays. C. a spectrum of many different colors of light. D. infrared light and radio waves.

Which material is primarily a mixture of weathered rock and organic matter? 1) minerals 2) soil 3) ocean water 4) seashells

How do buffers affect the pH of a solution? I would greatly appreciate an answer to this question.

Which of the following statements about igneous rocks is correct A. intrusive igneous rocks are formed when magma is called above the ground. B. Extrusive igneous rocks are formed when magma is cooled above the ground C.

The compound KOH is called

A balloon contains 1.00 mol helium gas at STP. What will the volume of the balloon be if the pressure increases to 2.00 atm?

If 100 mL of a gas were enclosed in a buret at 500 mm Hg, what volume would the gas occupy at 1000 mm Hg at the same temperature? P1V1=P2V2

Would Mn (HPO4) 2 be manganese (II) monohydrogen phosphate?