Physical Science 1st Semester Final

Is melting butter for popcorn a chemical or physical change?

• chemical
• physical

Properties that can be observed without changing the identity of the substance.

• Physical
• Chemical

The atomic number of an atom or ion refers to the number of:

• neutrons
• protons
• nucleons
• electrons

How many electrons does potassium K contain? (click to see image)

• 19
• 39
• 20
• 40

Which particles are found in the nucleus

• electrons and protons
• neutrons and protons
• neutrons and electrons
• footballs and soccer balls

What's a valence electron?

• electrons in the second energy level
• electrons in the outermost energy level
• the atomic number
• electrons in the first level

A(n) _________ is an ion with a positive (+) charge.

• anion
• cation
• ion
• solute

When an atom loses an electron, it becomes a:

• positive ion
• negative ion
• neutral ion
• neutral atom

If an atom has no charge, which of the following must be true?

• It has more neutrons than protons or electrons.

• There are only neutrons inside the atom.

• Its number of protons is equal to its number of electrons.

• The neutrons in the atom outnumber the electrons and protons.

Which of these are an ion?

• 3 protons, 3 neutrons, 3 electrons.

• 8 protons, 8 neutrons, 8 electrons

• 2 protons, 3 neutrons, 2 electrons

• 6 protons, 6 neutrons, 7 electrons