Which of the following gases will have the slowest rate of effusion at a given temperature?

N2

H2

He

Ar

Which element would be expected to have a similar physical and chemical properties as oxygen, and why?

Because copper is a metal, it is what?

When humans burn fuel or cut down trees, they (increase/decrease) levels of carbon dioxide in the atmosphere.

How are ions Formed?

What is the vertical row of elements called? What do they have in common?

You have arrived on a planet where S2, not O2, is the gas used as fuel in combustion reactions. When gaseous propane (C3H8) is burned in S2, H2S and carbon disulfide gases are produced. If 200.0 grams of propane and 75.

What are not chemical properties of matter?!

Calculate the mass of water produced when 2.06 g of butane reacts with excess oxygen.

What describes color and streak?

What is a group of specialized cells called when they work together to perform a specific function?