How can you tell if a chemical change has occurred?

Nitrogen dioxide has a volume of 775ml at STP. What is the new pressure in atmospheres if the volume changes to 615ml and the temperature to 25 degrees Celsius?

What is the answer to 300.3: 108

When a neat, ordered chemical is changed into a more chemical, there is an increase in what?

Covalent bonds are best describes by sharing electrons? A. True <- - I believe this is correct. B. False

Which method do you consider most appropriate for determining half-life?

Write a balanced chemical equation for the complete combustion of C3H7BO3, a gasoline additive. The products of combustion are CO2 (g), H2O (g), and B2O3 (s).

Which of the following polymers is used in plastic bottles and plastic containers? Select one: a. LDPE b. PVC c. Polystyrene d. HDPE e. Polypropylene

Which of the following statement is not true? A) The sun is involved in producing tides B) There can be two high tides in one location during a single day C) Only the oceans have tides D) If there is a high tide, there will be a low tide

A solution which has a concentration that exceeds its predicted solubility at a certain temperature and pressure would be -

Convert 4.992*1010 g to each of the following units. B. Mg c. mg D. metric tons