Unit 2 Review Physical Science

Gases take up a lot of space because gas molecules

• Have weak chemical bonds

• Are not very attracted to one another

• Contain very few atoms

• Have a small molar mass

What type of bond creates network/crystalline structures?

• Ionic

• Covalent

• Metallic

• Hydrogen

Do elements in a compound keep their properties after a chemical bond is formed?

• Yes

• No

How many hydrogens are in methane gas (CH4)?

• 1

• 2

• 3

• 4

Network structures have high melting points because

• They have a high intermolecular attraction

• They have a low intermolecular attraction

• They have no intermolecular attraction

• They have less intermolecular attraction

Which of the following has the highest intermolecular attraction?

• Water

• Carbon Dioxide

• Oxygen

• Nitrogen

Covalent bonds are formed between

• Ions

• Metal atoms

• Nonmetal atoms

• Compounds

Often atoms join so that each atom will have

• An even number of electrons

•  An outermost energy level that is full of electrons

• An equal number of protons and electrons

• More electrons than protons or neutrons

Solid ionic compounds have very high melting points because they

• Are positively charged

• Contain metallic elements

• Are made of elements that are solid at room temperature

• Contain charged ions that are locked tightly together

In a metallic bond, the nucleus of one atom is attracted by a nearby atom’s

• Nucleus

• Negative ion

• Energy structure

• Electrons