Which of the following is a source of chemical energy commonly used by humans? A. water flowing in a river B. a bicycle C. a sandwich D. turning on a lightswitch

You are performing an experiment in a lab to attempt a new method of producing pure elements from compounds. The only problem is that you do not know what element will form. By your previous calculations you know that you will have 6.

ron filings are placed on a scale. As the filings rust, the scale measures an increasing mass. How does the law of conservation of mass apply to these results? A. The law does not apply because a physical change occurred. B.

What mass (in g) of NH3 must be dissolved in 475 g of methanol to make a 0.250 m solution?

What causes the matter and energy for plate motion?

E Test: Q on (2013) Tools Glossary Which of the following is an example of an electric force that occurs in atoms? O A a proton attracts an electron B. a proton attracts a neutron Ca proton attracts another proton o. a proton repeis an electron

Calculate the pH of a solution of 0.25M H2SO4

His transmitter is mostly located in diffuse neuronal systems in the CNS, with cell bodies particularly in the raphe nuclei.

Mechanism with a small activation energy or one with large activation energy

Ammonium phosphate nh43po4 is an important ingredient in many fertilizers. it can be made by reacting phosphoric acid h3po4 with ammonia nh3. what mass of phosphoric acid is consumed by the reaction of 8.4g of ammonia?

True or false the first species to colonize newly exposed land are called primary species?