CHEM SEMESTER 1 FINAL

What phase change occurs when gas, cools down, and turns into a liquid?

• Melting

• Freezing

• Condensation

• Sublimation

A substance's heating curve is shown in the graph.  What is its boiling point?

• 100 C
• 60 C
• 80 C
• 20 C

A horizontal row of elements in the periodic table

• Molecule

• Period

• Family

• Atom

How many protons and electrons does this element have?

• 35

• 18

• 17

• 52

How many neutrons does calcium have?

• 20

• 40

• 60

• 0

What is the mass number of this atom?

• 1

• 3

• 4

• 7

In order for an atom to be neutral/have no electric charge what has to be true?

• The atom has more protons (p+) than electrons (e-)

• The atom has more neutrons (n0) than protons (p+)

• The atom has the same number of protons (p+) and neutrons (n0)

• The atom has the same number of protons (p+) and electrons (e-)

How many electrons does this atom have?

• 2

• 4

• 6

• 10

An element that has 9 protons, 9 electrons, and 10 neutrons, what is this element_____. (use your periodic table)

• Fluorine

• Neon

• Oxygen

Where is most of the mass in an atom located?

• in the nucleus
• in the electron cloud