Unit 3: Atomic Theory and the Mole

This is an example of a short answer question. On the Quest you will be expected to show your work!

Calculate the number of atoms in 10.0 g of sulfur.

Note: Quizziz will automatically say whatever you put is correct. To get real practice with answers for this type of problem see your note packet and the key!

This is an example of a short answer question. On the Quest you will be expected to show your work!

Calculate the average atomic mass for an element, X, that has 3 isotopes using the following data:

X-32 (mass of 31.972) has an abundance of 95.00 %

X-33 (mass of 32.970) has an abundance of 0.76 %

X-34 (mass of 33.967) has an abundance of 4.22 %

Note: Quizziz will automatically say whatever you put is correct. To get real practice with answers for this type of problem see your note packet and the key!

This is an example of a short answer question. On the Quest you will be expected to show your work!

Calculate the mass, in grams, of 9.00 mol of potassium (K).

Note: Quizziz will automatically say whatever you put is correct. To get real practice with answers for this type of problem see your note packet and the key!

What is the correct order of scientists in order of their work related to the atomic theory from earliest to most recent?

• Ernest Rutherford, JJ Thomson, John Dalton, & Democritus

• JJ Thomson, John Dalton, Ernest Rutherford, & Democritus

• Democritus, John Dalton, JJ Thomson, Ernest Rutherford.

• John Dalton, JJ Thomson, Democritus, & Ernest Rutherford

How many atoms of carbon are in 6.00g of carbon?

• 1.20x10²⁴atoms C

• 6.02x10²³atoms C

• 3.01x10²³atoms C

• 1.50x10²³atoms C

An atom is electrically neutral because

• neutrons balance the protons and electrons

• nuclear forces stabilize the charges

• the numbers of protons and electrons are equal

• the numbers of protons and neutrons are equal

Who came up with the first atomic theory?

• Dalton

• Socrates

• Thomas

• Rutherford

What is the name of the atom pictured here?

• Nitrogen
• Nitrogen-15
• Nitrogen-7
• Nitrogen-8

Which subatomic particle has a negative charge in the atom?

• proton

• neutron

• electron

• quark

Which of the following isotopes of titanium (Ti) is the most abundant?

• Ti-46

• Ti-47

• Ti-48

• Ti-50