Unit 5.1

Question 1

What particles contribute to the mass of an atom?

Answer 1

protons and neutrons

Question 2

What particle is located outside of the nucleus?

Answer 2

electron

Question 3

What are isotopes?

Answer 3

Isotopes are different forms on the same element, differentiated by their number of neutrons, and therefore their masses, physical properties, and radioactivity.

Question 4

What is the formula for Coulomb’s law?

Answer 4

F = k(q₁q₂/r²)

Question 5

What do the ‘q’ variables represent in the equation of Coulomb’s Law?

Answer 5

the charges of two particles

Question 6

What does the ‘r’ variable represent in the equation of Coulomb’s Law?

Answer 6

the distance between the two particles

Question 7

Opposite charges ___, same charges ___.

Answer 7

Opposite charges attract, same charges repel.

Question 8

An atom has 16 protons, 17 neutrons, and 16 electrons. What is its atomic mass? What is its atomic number? Is it electrically balanced (neutral or not)?

Answer 8

Atomic mass = 33
Atomic number = 16
Electrically neutral (same number of protons and electrons)

Question 9

Are electrons positively or negatively charged?

Answer 9

negatively

Question 10

As distance between particles increases, there is ___ attraction. They are ___ related.

Answer 10

As distance between particles increases, there is less attraction. They are inversely related.