Chemistry Fundamentals: Elements, Compounds, and Reactions: Multiple Choice

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01Which element is the most abundant in the Earth's atmosphere?
02What is the chemical symbol for the element Sodium, derived from its Latin name 'natrium'?
03The chemical formula H₂O represents which common compound?
04What is the name for the phase transition where a substance changes directly from a solid to a gas?
05What is the term for a substance that increases the rate of a chemical reaction without itself being consumed?
06In an atom, which subatomic particle carries a negative electrical charge?
07In a chemical equation, what are the starting materials that undergo a change called?
08What is the pH value of pure, neutral water at room temperature?
09Which of the following elements is classified as a noble gas?
10The atomic number of an element is determined by the number of what particles in its nucleus?
11What type of chemical bond involves the sharing of electron pairs between atoms?
12What is the chemical symbol for the element Gold?