What method of identifying substances is the best way to identify a chemical reaction

On a dry day, the temperature in Boulder (altitude: 5330') is 40F. What is the temperature (in F) on nearby Bear Peak (altitude: 8460') ?

An express train passes through a station. It enters with an initial velocity of 22.2 m/s and decelerates at a rate of 0.142 m/s2 as it goes through. The station is 206 m long. How long is the nose of train in the station?

Which of the following would be most useful in trying to obtain procedural information to replicate an experiment previously published? Peer-reviewed journal article, Internet search engine, dictionary, or encyclopedia

A 70.0-kilogram man is walking at a speed of 2.0 m/s. What is his kinetic energy?

A beam of electrons with a speed of is incident on a slit of width 200. nm. The distance to the detector plane is chosen such that the distance between the central maximum of the diffraction pattern and the first diffraction minimum is 0.300 cm.

Question 10 2.5 pts Which example identifies a change in motion that produces acceleration? a speed skater moving at an increasing speed on a straight track a vehicle moving down a straight street at a steady speed a particle moving in a vacuum at

If a 2,300 kg car is accelerating at 16 m/s^2, what is the force it is producing?

A hollow sphere of negligible mass and radius R is completely filled with a liquid so that its density is rho. You now enlarge the sphere so its radius is 2R and completely fill it with the same liquid. What is the density of the enlarged sphere?

what is the average speed of a person who can run around the track 4 times in 5 minutes? the track is 400 meters long.

A planet with a mass of 3.0 x 1023kg orbits 6.0 x 1010m from a star with a period of 3.4 x 1011seconds. Determine the mass of the star.