Symbolic Representations

Which of the following describes a chemical change?

• Water boiling into steam.

• Wax melting from a candle.

• Hydrogen gas reacting with oxygen to form water.

• Sugar dissolving in water.

What is the symbolic representation for liquid water absorbing energy to become gaseous water?

• H2O(g) + E → H2O(l)

• H2O(l) → H2O(g) + E

• H2O(l) + E → H2O(g)

• 2H2(g) + O2(g) → 2H2O(l) + E

What was Antoine Lavoisier's significant contribution to the field of chemistry?

• Developing the first periodic table of elements.

• Shifting chemistry from a qualitative to a quantitative science.

• Discovering the structure of the atom.

• Formulating the theory of relativity.

If 1.77 x 10^4 kg of hydrogen completely reacts with 1.42 x 10^5 kg of oxygen, what is the total mass of water formed?

• 1.24 x 10^5 kg

• 1.60 x 10^5 kg

• 1.77 x 10^4 kg

• 1.42 x 10^5 kg