1. Ibrahim is learning about electron affinity. He knows that electron affinity is the energy change when an electron is added to a gaseous atom. Which group has the most negative electron affinities (most favorable)?
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2. Diana is learning about electroplating. She understands that electroplating can be used to coat a metal with a thin layer of another metal. Which of the following is a reason for electroplating?
3. Which of the following is a metalloid?
4. The nucleus of an atom contains:
5. Particles of matter are always in:
6. Aisha is studying oxidation states of polyatomic ions. She learns that the sum of oxidation states in an ion equals the ion's charge. In the nitrate ion (NO3^-), what is the oxidation state of nitrogen if oxygen is -2?
7. Nora is making a saltwater solution. She adds 10 grams of salt to 100 grams of water and stirs. In this solution, what is the salt considered?
8. A voltaic cell is also known as:
9. Omar is learning about reversible reactions. He learns that the reaction: 2SO2 + O2 ⇌ 2SO3 is reversible. What happens if SO3 is removed from the system?
10. Fertilizers are produced with the help of: