How many neutrons does element X if it's atomic number is 28 and its mass number is 87

What is the fundamental frequency of a particular medium?

Is fe a reactant or product

A jar of tea is placed in sunlight until it reaches an equilibrium temperature of 31.6°C. In an attempt to cool the liquid, which has a mass of 173 g, 120 g of ice at 0.0°C is added.

A barometer is used to measure air pressure. true or false.

Which term best describes the phrase "the best explanation that science has to offer"? A. Theory B. Law C. Experiment D. Observation

Emission of light from an atom occurs when an electron

Which is an example of transfroming potential energy to kinetic

Place the ball in the plastic bag, and twist the top so the ball is secure in the bag. Wrap the twisted portion with tape so it stays tight. Use the hole punch or scissors to poke a hole in the part of the bag that's above the ball.

Choose The units of 1/4πε0 are: A. N2C2 B. N • m/C C. N2 • m2/C2 D. N • m2/C2 E. m2/C2

What does a fern ultimately depend on as an energy source?