The elements within a star can be determined by:

radio telescope

spectroscope

radar

A 0.821 gram sample of pure NH F was treated with 25.0 mL of 1.00 M NaOH and heated to drive off the NH3. How many milliliters of 0.500 M HCl are needed for the back titration?

If a bike rider travels 15 miles in 30 hours what is his velocity if it is constant?

How many grams of H are in H2O

A gas at 155 kPa and standard temperature has an initial volume of 1.00 L. The pressure of the gas rises to 500 kPa as the temperature also rises to 135°C. What is the new volume? 2.16 L 0.463 L 0.207 L 4.82 L

Damien runs around a 200 m oval track at the end of 4 laps what will be his distance and displacement

What is the first man made organic compound synthesized in laboratory?

Express (3 x 104) (4 x 1023) in scientific notation

Use Dimensional Analysis: convert: 0.36km/sec to m/min 2.6L to cm^3 9cm to mm 7.6mm^3 to cm^3

Something occurs when a liquid changes to a gas below its surface as well as on the surface

What happens to the reaction c2h6 + 137 kj when the temperature of the reaction is increased?