Gen Chem Semester 1 Review

What does the Shell Model of the atom say? (Choose the best option).

• Atoms have electron clouds and a nucleus

• Atoms have nuclei made of protons and neutrons, while electrons exist in shells around the nucleus

• Atoms have nuclei made of protons and electrons while the neutrons exist in the electron cloud

• Atoms have protons, neutrons, and electrons

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What's the difference between a physical property and a chemical one?

• Physical properties include flammability and reactivity. Chemical properties include color and length.

• Chemical properties include boiling and melting points. Physical properties include color and length.

• Physical properties do not change the ID of the substance, like melting or boiling point. Chemical properties do change the ID of the substance, like flammability or reactivity.

• Chemical properties do not change the ID of the substance, like melting or boiling point. Physical properties do change the ID of the substance, like flammability or reactivity.

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Which type of bond is made up of electrons that were stolen or given away?

• Ionic

• Covalent

• Metallic

• Homogeneous

• Heterogeneous

What ion will the element Sulfur make?

• +2

• +6

• -6

• -2

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How is the periodic table arranged?

• The columns are called Families or Groups. The rows are called Periods. Elements are arranged according to atomic number.

• The columns are called Families or Groups. The rows are called Periods. Elements are arranged according to atomic mass.

• The rows are called Families or Groups. The columns are called Periods. Elements are arranged according to reactivity.

• The rows are called Families or Groups. The columns are called Periods. Elements are arranged according to valence electrons.

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What is the atomic number of Fluorine?

• 9

• 18.998

• 17

• 7

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Melting and Burning are very similar properties. Are they chemical or physical properties?

• Melting is chemical and burning is physical.

• They're both chemical

• Burning is chemical and melting is physical

• They're both physical

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How many electrons fill the first 3 shells of an atom?

• 2, 8, 8

• 8, 8, 8

• 2, 8, 18

• 2, 2, 2

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You have two unknown white substances. You know one is an ionic compound and the other is covalent. What tests could you do to determine which is which? (Choose all that apply)

• Try melting them - ionic compounds have higher melting points than covalent

• Look at them under a microscope - covalent compounds usually form crystal lattices.

• Try burning them - covalent compounds usually change the color of the flame

• Try dissolving them - ionic compounds usually dissolve better than covalent

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Why are valence electrons so important?

• Valence electrons are the closest to the nucleus

• Valence electrons are the only electrons involved in bonding

• Valence electrons are the only electrons not involved in bonding

• Valence electrons make an atom radioactive

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