Chemistry - Ch 3 Review (Atomic Structure, Isotopes, Avg Mass)

The Ancient Greeks, like Aristotle, thought composed all matter.

• Earth, Water, Air, Fire

• Atoms

• Molecules

• Energy

How did Dalton change the study of matter?

• By making it a scientific pursuit with experimentation and data collection

• By discovering the electron

• By developing the periodic table

• By formulating the law of conservation of mass

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Thomson famously discovered the electron. What was the name of his model?

• Plum Pudding Model

• Bohr Model

• Rutherford Model

• Quantum Model

Rutherford used his Gold Foil Experiment to discover another subatomic particle. What was the particle he discovered?

• Electron

• Proton

• Neutron

• Photon

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How are the isotopes of an element alike and how are they different?

• They have the same number of protons but different numbers of neutrons.

• They have different numbers of protons and neutrons.

• They have the same number of neutrons but different numbers of protons.

• They have different numbers of electrons but the same number of protons.

Liam is learning about elements in his science class. Which subatomic particle gives an element its identity?

• Proton

• Neutron

• Electron

• Photon

A 'mole' in chemistry is ____.

• a unit of measurement

• equal to 6.022 x 10^23 particles

• equal to the mass of an element

• a furry little creature

Maya is conducting an experiment in her chemistry class. She needs to calculate the number of molecules in a sample. What is the significance of 6.022 x 10^23 in her calculations?

• It is the atomic number of carbon.

• It is Avogadro's number, representing the number of atoms or molecules in one mole of a substance.

• It is the pH level of pure water.

• It is the boiling point of water in Kelvin.

Which shows the correct molar mass of H, O, and C?

• Hydrogen: 1.01 g/mol, Oxygen: 16.00 g/mol, Carbon: 12.01 g/mol

• Hydrogen: 2.02 g/mol, Oxygen: 32.00 g/mol, Carbon: 24.02 g/mol

• Hydrogen: 1.01 g/mol, Oxygen: 15.99 g/mol, Carbon: 12.00 g/mol

• Hydrogen: 1.00 g/mol, Oxygen: 16.00 g/mol, Carbon: 12.01 g/mol

Calculate the mass in grams of 5 moles of Al.

• 134.9 grams

• 200.00 grams

• 26.98 grams

• 202.00 grams