Could a mixture be made only element and no compounds

The pressure inside a water droplet is higher than the surroundings, this is related to surface tension.

In physics how much energy is required to raise the temp of 9.78kg of water from 40.82c to 52.07c? The specific heat of water in this state is 4186j/kg-c.

What additional information is needed for velocity that uis not needed for speed?

47. What is necessary for differentiation to occur in a planet? a. It must be made of metal and rock. b. It must be made of a mix of materials of different density. c. Material inside must be able to flow. d. all of the above e. B and C

Which statement is true of an object in equilibrium

A wave with a frequency of 30 Hz has a wavelength of 40.5 m. How fast is the wave traveling?

A soccer ball is sitting in the middle of a soccer field during a game. When the referee blows his whistle, one of the players runs toward the ball and kicks it as hard as he can.

A body with v=20m/s changes its speed to 28m/s in 2sec. its acceleration will be

Charge: A piece of plastic has a net charge of + 2.00 μC. How many more protons than electrons does this piece of plastic have? (e = 1.60 * 10-19 C)

How much heat is needed to raise the temperature of 6g of water by 18oC?