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chemistry

Chemistry Vocauarly

Question: What is an atom?
Answer: The basic unit of a chemical element.

Question: Define atomic mass?
Answer: The average mass of an atom of a given element in atomic mass units.

Question: Define covalent bond?
Answer: The sharing of electrons.

Question: What are binary compounds?
Answer: Chemical compounds composed of only two elements.

Question: Define octet rule?
Answer: States that atoms or ions tend to be more stable with a valence electron configuration of eight.

Chemistry Vocabulary

Question: Define ionic bonds?
Answer: A type of chemical bonding that involves two opposite charges such as a metal ion and a non-metal ion, coming together through electrostatic attraction.

Question: Define isotopes?
Answer: Atoms of the same element with different number of neutrons in the nucleus.

Question: What is an element?
Answer: Any material that cannot be broken down into simpler materials.

Question: Define a compound.
Answer: A material that can be broken down into two or more atoms.

Question: Define law of definite proportion?
Answer: A law that states that whenever two elements combine to form a compound they do so in a definite proportion by mass.

Chemistry Questions

Question: Did Aristotle believe in the atom?
Answer: No he did not.

Question: What is the difference between physical and chemical property?
Answer: A physical property is a property of matter that can be measured without causing a chemical change.

A chemical property is a property that is displayed when matter undergoes a change in composition.

Question: Compare bonding and non bonding electrons?
Answer: Non bonding valence electrons are not used for bonding.

Bonding valence electrons are used to form a bond between a molecule.

Question: How many atoms are in one mol?
Answer: 6.02*10^23 atoms.

Question: What is ionization energy?
Answer: The energy required to remove an electron from a gaseous atom at ground state.

Chemistry Questions

Question: What are the elements in the middle of the periodic table?
Answer: The transition metals.

Question: What is the element Pb.
Answer: Lead.

Question: What is the Law of Conservation of Mass?
Answer: This states that atoms cannot be destroyed,but can be put together or rearranged with other atoms.

Question: State the difference between a law and a theory?
Answer: A scientific law is a statement based on repeated experimental observations that describes some aspect of the world.

A scientific theory summarizes a hypothesis or group of hypotheses that have been supported with repeated testing.

Question: Define Bohr's model?
Answer: Depicts the atom as small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus.

Chemistry Questions

Question: Define subatomic particles?
Answer: They are the three kind of particles that make up atoms.

Question: What are the horizontal rows of elements in the periodic table called?
Answer: Periods.

Question: Who discovered the neutron?
Answer: James Chadwick.

Question: What role does weak force play in?
Answer: It plays a role in the radioactive decay of unstable atoms.

Question: Describe the relationship between the elements valence electrons and its group number?
Answer: The the group number determines the number of valence electrons in the atom.