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Chemistry
Chemistry revision
31
Chemistry
11th Grade
11/08/2019

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Cards

Term
What does 'acidic' mean?
Definition
Has a lower pH than 7
Term
What is an alpha particle?
Definition
a helium atom with removed atoms
Term
What does the term 'atomic radius' mean?
Definition
refers to the size of an atoms and can be measured by halving the distance between to atomic nuclei.
Term
What does 'Basic' means?
Definition
Has a higher pH than 7
Term
What is 'boiling point'
Definition
The temperature when a liquid becomes a gas.
Term
What is a diatomic molecule?
Definition
a molecule containing two atoms of the same element bonded together?
Term
what is an electron?
Definition
a negatively charged subatomic particle that exists outside the nucleus
Term
What is an electron configuration?
Definition
A representation of electrons
Term
What is electronegativity?
Definition
the attraction between a positively charged nucleus of one atom and the negatively charged electrons of the other atom of a neighbouring atom
Term
What is electrostatic force?
Definition
the attraction between two opposing charges
Term
What is an ion?
Definition
A molecule or atom that has gain or lost electrons and is now charged
Term
what is ionisation
Definition
the process in which an atoms gains or loses electrons to form a  charged ion
Term
What is an isotope
Definition
an atom of an element that has the same number of protons but differ in neutrons
Term
What is a 'melting point'
Definition
The temperature in which a solid becomes a liquid
Term
What  is a metalliod?
Definition
an element that displays both metal and non-metal properties?
Term
What is a neutron?
Definition
a neutral subatomic particle that exists inside the nucleus
Term
What is a proton?
Definition
Positively charged subatomic particle that exists inside the nucleus
Term
What is the quantum theory?
Definition
it describes the behaviour of matter and energy at the atomic and subatomic level
Term
What is a subatomic particle?
Definition
a component that makes up or exists with the nucleus
Term
What is valency
Definition
the combining power of an element as determined by the number of valance electrons
Term
What is an anion?
Definition
a non-metal atom that has gain one or more electrons and is negatively charged
Term
what is a cation?
Definition
a metal atom that has lost one or more electrons and is positively chrged
Term
What is a covalent bond?
Definition
a sharing of electrons between two atoms
Term
Properties of a covalent bond
Definition
- Lower melting and boiling points
- do not conduct electricity and heat
- brittle solids
Term
What is ionic bonding?
Definition
Electrostatic attractive forces holding ions together
Term
Properties of ionic properties
Definition
- High melting and boiling points
- Moderate heat and electricity
- Soluble
Term
What is a Lewis structure
Definition
visual diagram to show valence electrons
Term
What is a lone pair?
Definition
Valence electrons that are bonded together
Term
What is the octet rule?
Definition
an atom gains or loses electron to reach 8 valence electrons
Term
What is a half-life?
Definition
The time it takes for half of the atoms of radioactive sample to decay
Term
What is an isotope?
Definition
an element that has the same number of protons but differ in neutrons
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