The radius of an atom extends to the edge of the

The N-H bond in ammonia is polar because A: nitrogen occupies more space than hydrogen. B: hydrogen is much more electronegative than nitrogen. C: it is a hydrogen bond. D: it is an ionic bond. E: nitrogen is much more electronegative than hydrogen.

The law of conservation of energy states that energy cannot be created or from one substance to another. be

Which of the following is a compound machine? a screw being screwed into a piece of wood a can opener a crowbar a wheel and axle

State three differences between an electron and a proton

Convert 150 g/L to the unit g/mL. A. 15,000 g/mL B. 15 g/mL C. 0.15 g/mL D. 0.0015 g/mL

What does it mean when there are 2.3 x 10-4 moles?

Electric force is an A. attraction and repulsion between protons and electrons . B. attraction and repulsion between protons and neutrons. C. attraction and repulsion between neutrons and electrons.

A salt crystal has a mass of 0.18 mg. how many nacl formula units does it contain?

Which of the following is easist to accelerate? A. bowling ball B. tennis ball C. golf ball D. ping pong ball

Fish need at least 4 ppm dissolved o2 for survival. part a what is this concentration in mol/l?