Chemistry Flashcards
What is chemistry?
The study of the structure, composition, and properties of matter and the transformations matter undergoes.
Give examples of physical properties.
State, colour, odour, lustre, texture, hardness, crystal form, mass, volume, density, solubility, viscosity, malleability, ductility, melting point, boiling point.
What is a phase?
A homogeneous part of a heterogeneous mixture, a visibly distinct portion.
A pure substance can be broken down by:
Chemical changes.
A chemical change is called a…
Chemical reaction. It results in a new substance.
What is a reactant?
The starting material in a chemical reaction
What are the new substances formed by a chemical reaction?
Products.
What a clues to a chemical change?
Change of colour, odour, energy, formation of bubbles or precipitates.
What happens in an esoteric reactions.
Energy is released.
What is an endothermic reaction?
A reaction where energy is absorbed.
What are diatomic elements?
Elements that naturally occur as molecules, consisting as two atoms.
What are the diatomic elements?
H2, N2, O2, F2, Cl2, Br2, I2, At2 (astatine)
What are the poly atomic elements?
P4, S8
Who invented the periodic table, when, and what was it like?
Mendeleev published the first periodic table in 1869, which included only 64 known elements.
The repetition of the properties of the elements is a fun dental pattern known as…
Periodicity
