CHEMISTRY FINAL EXAM QUESTIONS AND 100% CORRECT
DETAILED ANSWERS||LATEST UPDATE 2025 GRADED A+
atomic number (protons) -ANSWER: This number identifies the number of protons in
the nucleus of an atom. Helium would have 2 protons in the nucleus.
Atomic number (electrons) -ANSWER: This number identifies the number of
electrons in the electron cloud of a stable atom. Helium would have 2 electrons.
Atomic Number-Identifies -ANSWER: Each element has its own atomic number.
Helium is the only element to have an atomic number of 2.
Protons -ANSWER: Positively charged particles located in the nucleus.
Electrons -ANSWER: Negatively charged particles located in the electron cloud.
Neutrons -ANSWER: The particles of the nucleus that have no charge. The number
of neutrons in an element is found by subtracting the atomic number from the atomic
mass. In the image of Gold-you would subtract 197-79 to get 118 neutrons. There would
be 118 neutrons in the nucleus of an atom of gold.
Atomic Mass-Bromine -ANSWER: Look at the image. The atomic mass of bromine is
79.9 (we could round that to 80)
Protons-Bromine -ANSWER: Look at the image. Bromine would have 35 protons
because that is its atomic number.
, Electrons-Bromine -ANSWER: Look at the image. Bromine would have 35 electrons
because the amount of electrons is the same as the atomic number.
What does H stand for? -ANSWER: Hydrogen
What does O stand for? -ANSWER: Oxygen
Chemical Property -ANSWER: The characteristic of a substance that determines
how it interacts with other substances.
Physical Property -ANSWER: The characteristic of a substance that can be observed
without changing it chemically such as size, shape, density and phase.
Melting Point -ANSWER: The melting point of something is a physical property.
Color of an object -ANSWER: The flower is pink. This is a physical property of the
flower.
Rust -ANSWER: Rusting: When iron containing materials like steel are exposed to
oxygen they rust. This is a chemical property.
Chemical Change -ANSWER: A change in matter that produces one or more new
substances
Physical Change -ANSWER: A change in a substance that does not involve a
change in the identity of the substance
Crushing a sugar cube -ANSWER: This is a physical Change.
DETAILED ANSWERS||LATEST UPDATE 2025 GRADED A+
atomic number (protons) -ANSWER: This number identifies the number of protons in
the nucleus of an atom. Helium would have 2 protons in the nucleus.
Atomic number (electrons) -ANSWER: This number identifies the number of
electrons in the electron cloud of a stable atom. Helium would have 2 electrons.
Atomic Number-Identifies -ANSWER: Each element has its own atomic number.
Helium is the only element to have an atomic number of 2.
Protons -ANSWER: Positively charged particles located in the nucleus.
Electrons -ANSWER: Negatively charged particles located in the electron cloud.
Neutrons -ANSWER: The particles of the nucleus that have no charge. The number
of neutrons in an element is found by subtracting the atomic number from the atomic
mass. In the image of Gold-you would subtract 197-79 to get 118 neutrons. There would
be 118 neutrons in the nucleus of an atom of gold.
Atomic Mass-Bromine -ANSWER: Look at the image. The atomic mass of bromine is
79.9 (we could round that to 80)
Protons-Bromine -ANSWER: Look at the image. Bromine would have 35 protons
because that is its atomic number.
, Electrons-Bromine -ANSWER: Look at the image. Bromine would have 35 electrons
because the amount of electrons is the same as the atomic number.
What does H stand for? -ANSWER: Hydrogen
What does O stand for? -ANSWER: Oxygen
Chemical Property -ANSWER: The characteristic of a substance that determines
how it interacts with other substances.
Physical Property -ANSWER: The characteristic of a substance that can be observed
without changing it chemically such as size, shape, density and phase.
Melting Point -ANSWER: The melting point of something is a physical property.
Color of an object -ANSWER: The flower is pink. This is a physical property of the
flower.
Rust -ANSWER: Rusting: When iron containing materials like steel are exposed to
oxygen they rust. This is a chemical property.
Chemical Change -ANSWER: A change in matter that produces one or more new
substances
Physical Change -ANSWER: A change in a substance that does not involve a
change in the identity of the substance
Crushing a sugar cube -ANSWER: This is a physical Change.
