Chemistry Test 1
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17 Terms
What is an atom?
An atom is the smallest unit of an element that retains the properties of that element.
What is an element?
An element is a pure substance that consists entirely of one type of atom.
What is a compound?
A compound is a substance formed when two or more elements are chemically bonded together.
What is a mixture?
A mixture is a combination of two or more substances that are not chemically bonded.
What is atomic number?
The atomic number is the number of protons in the nucleus of an atom, which determines the chemical properties of an element.
What is mass number?
The mass number is the total number of protons and neutrons in the nucleus of an atom.
What is an isotope?
An isotope is a variant of an element that has the same number of protons but a different number of neutrons.
What is an ion?
An ion is an atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.
What is a cation?
A cation is a positively charged ion that is formed when an atom loses electrons.
What is an anion?
An anion is a negatively charged ion that is formed when an atom gains electrons.
What are valence electrons?
Valence electrons are the electrons in the outer shell of an atom that can participate in bonding.
What is metallic bonding?
Metallic bonding is the force of attraction between the positively charged metal ions and the delocalized electrons in a metal.
What is a critical element?
Elements considered vital for the world’s economy but are in short supply
What is green chemistry?
The design and manufacture of efficient chemical processes and products, that minimise the use or generation of harmful substances, so that impacts on human health and the environment are reduced.
What is a sustainable chemical process?
Sustainable chemical processes meets current human needs without affecting the needs of future generations
What is a linear economy?
An economy where raw materials are converted into products that are used and then discarded as waste
What is a circular economy?
An economy where waste and pollution is eliminated, products at the end of life are reused, repaired or recycled, and the environment is not harmed