Which statement best describes elements?

A. They are the smallest particles of any material.

B. They are composed of only one type of atom.

C. They are the most expensive materials on earth.

D. They break down easily

Why do neither liquids or gases have permanent shapes?

3. Water changing from a solid directly into a gas is

A nucleus is like ...

A chemistry student at a yard sale considers buying a silver coin. The student asks permission to test the coin to determine whether it is pure silver. They find that the coin has a mass of 15.79g. Submerging the coin in 12.

How many isotopes of hydrogen exist in nature?

What is an element that has more valence electrons than fluorine and less energy levels than sodium?

Why can't we breathe in pure oxygen for long

In warm water conditions, female offspring hatch from eggs laid by painted turtles. Male offspring are produced under cold conditions.

It takes 53.0 J to raise the temperature of an 11.0 g piece of unknown metal from 13.0∘C to 24.2 ∘ c. What is the specific heat for the metal?

What happens to the velocity of a sound wave in air if the temperature of the air increases