Which is a pure substance?

soda

gasoline

salt water

carbon dioxide

What is the complete ground state electron configuration for the selenium atom?

You have a mixture that contains 0.380 moles of Ne (g), 0.250 moles of He (g), and 0.500 moles CH4 (g) at 400 K and 7.25 atm. What is the partial pressure of He? 1. 1.60 atm 2. 3.21 atm 3. 3.63 atm 4. 2.44 atm

Explain organic chemistry

A geologist visits an environment to make observations. The scientist predicts that the environment will undergo secondary succession. What did the geologist likely observe in the environment to draw this conclusion? Check all that apply.

If the pOH of a solution is 9.3, what is the [OH-]

How to assign oxidation and reduction numbers

How to tell difference between hydrogen gas and oxygen gas?

Why do atoms have different speed

Jose gets up from his seat on the bus to move closer to the front. Just as he begins to walk forward, the bus stops at a light.

How would you present weight change if Earth had twice the mass that it does