How many elements are in oxygen

What determines if a bubble seems to change colors?

If a wave produced by a fireworks explosion is that light wave or sound wave

How much work is done to raise a 20N box 4m?

In what situation do we use a volumetric flask, conical flask, pipette and graduated cylinder? Explain your answer from accuracy aspects of these apparatus.

Ammonia, nh3, is a weak base with a kb value of 1.8*10-5. part a what is the ph of a 0.440 m ammonia solution? express your answer numerically to two decimal places. view available hint (s)

Why does the effective nuclear charge increase across a row of the periodic table?

Iodine-131 decays to form xenon-131. the half-life of this reaction is 8.07 days. from a 200-g sample of iodine-131, how much of the sample is xenon-131 after 16.14 days?

Complete the following statement by checking all that apply Creativity allows scientists to develop multiple approaches to solving problems. adapt to changes in scientific knowledge. look at old problems in new ways.

The atomic weight of hydrogen is 1.00794. a. True b. False

Describe What kind of ions do metals form? What kind of ions do nonmetals form?