While elements and compounds are related, they are different. unlike elements, compounds can be described as which of the following?

a) consists of only one type of atom

b) are the smallest form of a particle

c) exists only as pure substances

d) are made of at least two types of matter

plz answer !

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.

What would be the strength of earth's gravitational field at a point where an 80.0 kg astronaut would experience a 80% reduction in weight

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply