List the two main kinds of changes that you can observe when chemical reactions occur.

What does NO5 stand for?

Describe the range of the radii of most atoms

What percentage of a radioactive substance remains after two half-lives?

You measure the mass of a model car to be 230 grams. The actual mass is 218 grams. what is your percent error

If the water table is not too deep, how do plants tap into it? Plant's roots can take up water by capillary action. Plant's stem can pull in water by osmosis. Plant's tendrils can pull up water through transpiration.

Crude oil may contain hundreds of different types of hydrocarbons. Some examples include: Butane (C4H10) Dodecane (C12H26) Octane (C8H18) Benzene (C6H6) Many common fuels, such as gasoline and kerosene, are combinations of these substances or others.

What will happen if the concentration of water inside a cell is higher than the concentration of water outside a cell?

During a lab, you heat 1.04 g of a niso4 hydrate over a bunsen burner. after heating, the final mass of the dehydrated compound is 0.61 g. determine the formula of the hydrate and also give the full name of the hydrate.

Which molecule is a source of energy, a store of energy, and can mix with water?

How many atoms will you find in 2.0 moles of he?