When electricity is added to water, water breaks down and becomes hydrogen gas and oxygen gas. This is a chemical change because

A.

energy has been added.

B.

a liquid has become a gas.

C.

hydrogen and oxygen are chemicals.

D.

water has changed its identity

You need to prepare 250. ml of a 0.600 m aqueous solution of sucrose, c12h22o11 (aq, which is used frequently in biological experiments.

Which is the most important value of a graph

The density of mercury metal is 13.6 g/ml. what is the mass of 2.5 l

Which is usually associated with a higher reaction rate? A.) diluting a solution of the reactants B.) adding modeling clay to the reactants C.) removing heat energy from the reactants D.) using a solid with a high surface area in the reactants

Why are there only two elements in the first period of the periodic table? A. There are more than 2 elements in the first period of the periodic table. B. The first two elements share a unique property the rest of the periodic table does not have. C.

What is the molar mass of an unknown hydrocarbon whose density is measured to be 1.97 g/l at stp?

Which is an example of flow of heat through conduction

Which of the following is an extensive physical property of matter? volume viscosity odor density

When is Ksp determined for a system?

What is the average surface temperature of Uranus