If an atom of nitrogen binds wit three hydrogen atoms to form a molecule of ammonia, how many lone pairs of electrons does nitrogen have?

A. One

B. Three

C. Four

D. Five

A tropical storm turns into a hurricane when wind speeds reach?

Buoyancy makes objects A. feel heavier. B. feel lighter. C. fly.

Which of the following do not make their own energy through nuclear fusion? Select all that apply. A. giant star B. protostar C. dwarf star D. black hole E. neutron star F. main sequence star

Your mobile charger is an example of a. transformer b. solenoid c. motor. d. generator

Which is the weakest of the four fundamental forces? strong nuclear weak nuclear electromagnetic gravitational

What is the reason behind the tail of a comet moving away from the Sun? A The gravity of Jupiter pulls it away from the Sun. The nucleus of the comet propels it away from the Sun. C. The radiation pressure and solar wind propels it away from the Sun.

Calculate the energy released as heat when 51.60 g Cu 2 O (s) undergo oxidation at constant pressure.

During summer vacation, Juan traveled a total distance of 400 miles. His trip took 8 hours. What was the average speed during his trip?

Where Pabs is absolute pressurePg, is gauge pressure, and Patm is atmospheric pressure. For example, if your tire gauge reads 34 lb/incz (pounds per square inch), then the absolute pressure is ...

The tip of a triangle is held 12.0 cm above the surface of a flat pool of water. A submerged swimmer in the pool sees the tip of the triangle at what distance above the water? Let the indices of refraction nwater = 1.33 and nair = 1.00.