67.029g to three significant figures

Coal is made of carbon. Coal burns at high temperature in the presence of oxygen. The result of this chemical reaction is

Write the symbol notation for the silicon isotope that contains 16 neutrons

How are nutrients returned to soil?

Which is the rate at which velocity changes? A. speed B. motion C. direction D. acceleration

Which of the following are produced by the process of respiration A. Sugar and carbon dioxide B. Light energy with water C. Carbon dioxide and water

What is the total number of moles represented by 20 grams of CACO3 A. 0.1 B. 0.2 C. 1 D. 2

Which describes the polarity in a water molecule? a). partial negative charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms b).

To what temperature in kelvin will a 2.3 L balloon have to be heated to expand to a volume of 400 L Assume the initial temperature of the balloon is 25 degrees celsius.

In which changes of state do atoms lose energy?

Can you live without body tissue? This is a yes or no question, no explaining required, but you can add it if you want. : D