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 boy and his skateboard have a combined mass of 65KG what is the speed of the boy and skateboard if they have a momentum of 275 KG times M/s

A stone is thrown vertically upward with velocity 9.8ms 1) calculate the time taken to reach maximum height. 2) what is the maximum height reached 3) what is time taken to reach ground 4) what velocity it reaches the ground

Ferns that eject spores generally do so in pairs, with two spores flying off in opposite directions. The structure from which the spores are launched is quite lightweight.

How many grams of nano3 are required to saturate 100 grams of water at 90°c?

0.2000 kg of water at 20.00°C is contained in a 0.1000-kg copper container. The container is shaken vigorously for 10.00 minutes to cause the temperature to rise to 22.00°C. Calculate the work done on the system and the heat supplied to the system.

A 0.6 kg basketball with a velocity of + 6 m/s rolls toward a 0.2 kg ball of clay with a velocity of + 1 m/s. If the balls collide and stick together, what is the velocity following the collision?

What are the disadvantages of dynamo?

Why must indirect evidence be used to study the structure of atoms?

2. When temperature increases, what happens to the molecules in a chemical reaction?

Mrs Garcia traveled 15 km in 1 hour. What was her average velocity in km/s?