Chemistry S1 Review

Which of the following is a mixture?

• Salad

• Oxygen

• Carbon Dioxide

• Salt

Which of the following is a physical change?

• Burning wood

• Baking a cake

• Melting ice

• Sulfuric acid reacting with sugar

Which of the following is an element?

• Carbon

• Carbon Dioxide

• C₆H₁₂O₆

• Sulfur Dioxide

What is the atomic number?

• Charge of the atom

• Mass of the atom

• Number of neutrons in an atom

• Number of protons in an atom

Which subatomic particle has a negative charge?

• Proton

• Neutron

• Electron

A neutral atom has

• The same number of neutrons and protons

• The same number of neutrons and electrons

• The same number of protons and electrons

• More protons than electrons

Which scientist was the first to propose atoms had a nucleus due to his work with the gold foil experiment?

• Democritus

• JJ Thompson

• Niels Bohr

• Ernest Rutherford

Which scientist had an atomic theory with a model based on the orbits of planets and proposed that electrons orbited the nucleus on fixed paths with designated energies?

• Democritus

• JJ Thompson

• Niels Bohr

• Ernest Rutherford

Periodic Law states that the elements are arranged according to their atomic______ so that elements with similar chemical properties are in the same ______ and properties repeat periodically.

• Numbers, rows

• Masses, column

• Masses, rows

• Numbers, column

A row on the periodic table is known as a what?

• Group

• Period

• Family

• Isotope