Using a cathode ray tube, JJ Thompson discovered what subatomic particle?
Answer 1 – 30
Electrons
Question 1 - 40
An element contains atoms with the same number of what subatomic particle?
Answer 1 – 40
Protons
Question 1 - 50
What is a molecule?
Answer 1 – 50
Two or more atoms with a definite arrangement held together by chemical bonds.
Question 2 - 10
The atomic number of an atom is equal to what?
Answer 2 – 10
Protons
Question 2 - 20
Calculate the atomic mass of Oxygen with 10 neutrons.
Answer 2 – 20
18
Question 2 - 30
Element X has an atomic number of 15 and an atomic mass of 37. How many neutrons does element X have?
Answer 2 – 30
22
Question 2 - 40
What is the unit used for measuring the mass of atoms.
Answer 2 – 40
Atomic mass units (amu)
Question 2 - 50
What is the atomic number of Calcium? If Calcium has 24 neutrons, what is its atomic mass?
Answer 2 – 50
The atomic number is 20, and its mass is 44.
Question 3 - 10
Define an ion.
Answer 3 – 10
An atom with a net positive or negative charge.
Question 3 - 20
What is the difference between anions and cations?
Answer 3 – 20
Anions have a negative charge and cations have a positive charge.
Question 3 - 30
What two subatomic particles must be equal in order to create a neutral atom?
Answer 3 – 30
Protons and Electrons
Question 3 - 40
How many electrons are in S-2?
Answer 3 – 40
18 electrons
Question 3 - 50
Which atom has more electrons? Mg+1 or O-
2?
Answer 3 – 50
Mg+1
Question 4 - 10
Define isotope
Answer 4 – 10
Atoms of the same element with different numbers of neutrons resulting in different atomic masses.
Question 4 - 20
How many neutrons are in a Carbon isotope with a mass of 20?
Answer 4 – 20
8 neutrons
Question 4 - 30
Calculate the average atomic mass of these two Nitrogen isotopes: 95% 14N and 5% 15N.
Answer 4 – 30
14.05 amu
Question 4 - 40
Calculate the average atomic mass of these three isotopes of Oxygen: 78% 16O, 8% 17O, 14% 18O.
Answer 4 – 40
16.36 amu
Question 4 - 50
There are three isotopes of Silicon: 84% 28Si, 10% 29Si, 6% 30Si. A: How many neutrons does each isotope have? B: What is the average atomic mass? (Silicon has an atomic number of 14)