Can a measurement be exact

Mixtures can occur between all phases of matter. Give an example for each of the following mixtures: 1. Gas/gas 2. Gas/liquid 3. Liquid/liquid 4. Solid/liquid 5. Solid/solid

In our physical world, by far, the most abundance free charge in the universe is the electron, which has a negative charge. What do we mean, then, when we say that the surface of an object is positively charged?

If a beaker of water is placed under a broiler so that the heating coil is above the beaker. It is observed that only the surface layer boils. The water at the bottom of the beaker remains close to the initial temperature of the water.

A photon with a wavelength of 2.29 * 10^-7 meter strikes a mercury atom in the ground state. Determine the energy, in electronvolts, of this photon.

Color blindness is a sex-linked, trait.

Which of the following describes subatomic particles? carbon and nitrogen solids, liquids, gases larger than atoms protons, neutrons, and electrons

What is the difference between speed and velocity? A) velocity describes speed with direction. B) there is no difference. C) Velocity describes direction with position. D) Velocity is used in space, while speed is used on earth.

How do you calculate resistance with coulombs, time and J's?

Difference between specific heat capacity and latent heat?

What are artificial magnets and natural magnets? examples