The total energy of a system remains

A beaker contains 70 ml of water. how many molecules of water does this beaker contain? (hint: the density of water is 1.0 g/ml)

A mothball, composed of naphthalene (c10h8), has a mass of 1.64 g. part a how many naphthalene molecules does it contain?

Approximately how many half-lives must pass for the amount of radioactivity in a substance to decrease to below 1% of its initial level?

How does the properties of matter in liquid and gas state allow the Herons fountain to work?

What two parts are found in the nucleus

What mass of copper is consumed in the reaction with hydrochloric acid if 10.0 g of gas is collected?

How does the movement of molecules inside a solid block of iron change as the iron is heated? The molecules move faster. The molecules move slower. The molecules stop moving completely. The molecules move in the same way at all temperatures.

Read the following passage: The movement of tectonic plates buries a rock deep inside Earth. Intense heat and pressure change the mineral composition of the rock and transform it into Rock A.

What is a change which forms one or more new substances?

Which changes occur as a cadmium atom, Cd, becomes a cadmium ion, Cd2+? (1) The Cd atom gains two electrons and its radius decreases. (2) The Cd atom gains two electrons and its radius increases.