Cracking the SAT Chemistry Subject Test

Sometimes it happens that an atom loses or gains one or more electrons. When that happens, the num ...

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Seeing Is Believing One of the major advances in determining atomic structure came with the creation ...

THE PERIODIC TABLE When you sit down to take the SAT Chemistry Subject Test, you will ...

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For the SAT Chemistry Subject Test, you have to know certain things about the elements and other information ...

while electrons have practically no mass. Protons and neutrons each have mass of roughly 1 atomic mass ...

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Let’s Talk Numbers By the way, mass number doesn’t appear on the periodic table. Why not? Bec ...

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Remember the following: Neutrons: • along with protons, make up the nucleus of an atom • elec ...

DRILL 1 Question Type A Questions 1–5 refer to the following. (A) Atom (B) Ion (C) Neutron (D) Proton (E) Electron ...

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Question Type C Two different sodium atoms or ions may differ in all of the following ways EXCEPT (A) th ...

Summary An atom consists of neutrons (charge = 0, mass = 1 amu) and protons (charge = +1, mas ...

Chapter 5 Chemical Reactions and Stoichiometry Chemistry is a science largely concerned with reactions, or how ...

THE WORLD OF MOLECULES As we mentioned in Chapter 4, an atom is the smallest particle of an element. Atoms ...

• The molecule has 2 hydrogen atoms and 2 oxygen atoms. Let’s start with hydrogen. • The ...

• How about water? The largest whole number that will divide evenly into 2 and 1 is 1. So the e ...

THE MOLE What’s a mole? It’s a number, like a dozen or a gross. Dozen, as you know, means 12. Gross m ...