Witch equations are correctly balanced.

H 2 O + 2O 2 H 2 O 2

Fe 2 O 3 + 3H 2 2Fe + 3H 2 O

Al + 3Br 2 AlBr 3

CaCO 3 CaO + CO 2

Which is an example of an electrolytic cell? a battery a fuel cell a rechargeable battery a spontaneous reaction between lithium and copper

A certain element forms an ion with 36 electrons and a charge of + 2. identify the element. express your answer as a chemical symbol.

Which statement summarizes the difference between a law and a theory? A. A theory is a conclusion that is drawn from observations and experiments, but a law provides an explanation. B.

Which of these statements best describes the similarity between the two events shown in the diagram? Select one: a. Both may result in eclipses of the sun or moon. b. Both may cause the moon's shadow to fall on Earth. c.

Which describes a step in the process of forming an ionic bond? Ametal atom loses electrons and becomes a positive ion. A metal atom gains electrons and becomes a negative ion. Anonmetal atom loses electrons and becomes a negative ion.

Which best describes the relationship between solute, solvent and solution? 1. A solution and solute combine to form a solvent 2. A solute is dissolved in a solvent to form a solution 3. A solvent is dissolved in a solute to form a solution 4.

A watermelon weighing 10 newtons is lifted 2 meters. How much work is done?

If an atom donates or accepts an electron, what is it considered

In this experiment, you will measure mass and volume of various sport balls, both regularly shaped ball and irregularly shaped.

An atom that has a negative four charge will have one of the following? A. 4 more protons than electrons B. An equal amount of protons and electrons C. 4 more electrons than protons D. 2 more neutrons than protons