1) Which pure substance is composed of more than one element?

A. carbon

B. gold

C. water

D. sodium

A sample of neon gas occupies a volume of 752ml at 25k. What volume will the gas occupy at 80k if the pressure remains constant

What will happen to the pressure inside a container of gas if some of the gas is allowed to escape? Select one: a. there will be no effect on the pressure b. The pressure will increase c. the effect is impossible to determine d.

Which of these describes an exothermic reaction? A. Energy is transferred by the reaction B. No energy is absorbed by the reaction C. Energy is released by the reaction D. Energy is created by the reaction

What process do scientists think proved earth with oxygen-rich atmosphere?

Living organisms contain carbon compounds.

Passing of traits from parents to offspring is called

Calculate the percent composition of these compounds: (Ethane:C2H6) and (Sodium hydrogen sulfate: NaHSO4).

What kind of waves are used in many forms of communication

What is the volume, in L, of 0.691 moles of O_2 2? gas having a temperature of 66.1? C and pressure of 5.91 atm

How can the concept of density be used to differentiate between a genuine diamond and an imitation diamond