QUIZ 2

Which of the following statements is part of Dalton's Atomic Theory?

• Atoms can be created or destroyed in a chemical reaction.

• Atoms of the same element are identical in size and mass.

• Compounds are formed by the combination of the same element.

• Atoms consist of protons, neutrons, and electrons.

What does the Law of Conservation of Mass state?

• The mass of the products is less than the mass of the reactants.

• Mass is created during a chemical reaction.

• No change in mass occurs during a chemical reaction.

• Mass can be destroyed during a chemical reaction.

The Law of Definite Proportion states that:

• A compound contains the same elements in varying proportions.

• A compound always contains the same elements in fixed proportions by mass.

• Elements can combine in any proportion to form a compound.

• Compounds can only be formed by a single combination of elements.

What happens to the mass of a substance in a chemical reaction, according to the Law of Conservation of Mass?

• It increases.

• It decreases.

• It remains the same.

• It fluctuates.

Which of the following is an example of a molecular formula?

• C

• CH

• CH4

• C2H5

What is the empirical formula for the molecule C2H4O2?

• CHO

• CH2O

• C2H2O

• C2H4O2

The atomic number of an element refers to:

• The number of neutrons.

• The number of protons.

• The number of electrons.

• The atomic mass.

An atom with 8 protons and 8 neutrons has an atomic number of:

• 16

• 8

• 0

• 4

Ions are formed when an atom:

• Gains or loses neutrons.

• Gains or loses electrons.

• Gains or loses protons.

• Gains or loses a nucleus.

What charge do cations carry?

• Negative

• Neutral

• Positive

• None