What is an element?
a pure substance
What is a compound
2 or more elements chemically combine to form a compound.
What is a mixture?
2 or more materials combine physically not chemically
What is a physical property?
something that alters the physical appearance of something without changing the composition of it’s matter.
What is a chemical property?
something that is measured through changing the chemical composition of matter.
What are the first 20 elements on the periodic table?
Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Sodium, Magnesium, Aluminium, Silicon, Phosphorus, Sulphur, Chlorine, Argon, Potassium and Calcium.
What is the atomic number?
The number of protons in an atom, represented by the letter A
What is the mass number?
Number of nucleons in an atom (Neutrons and Protons)
What is mass spectroscopy?
an analytical chemistry technique that helps identify the amount and type of chemicals present in a sample by measuring the mass-to-charge ratio and abundance of gas-phase ions.
What is a covalent bond?
When two non-metals form a bond they all want to GAIN electrons. They therefore have to SHARE electrons, making a covalence bond.
What is a metallic bond?
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What is an ionic bond?
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What is the Avogadro’s concept?
commonly called the mole, Avogadro’s concept is a way of converting AMUs to grams. 6.02 x 10 to the power of 23
What are endothermic reactions?
a process/reaction in which the system absorbs energy from the surroundings in the form of heat.
What are exothermic reactions?
a chemical or physical reaction that releases heat. It gives energy to its surroundings. The energy needed for the reaction to occur is less than the total energy released.
What are nano materials?
a materials having particles or constituents of nanoscale dimensions, or one that is produced by nanotechnology.
