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Chemistry > C1 > Flashcards

C1 Flashcards

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1
Q

what is Atomic number

A

The number of protons in an atom of an element

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2
Q

what is Mass number

A

The total number of protons and neutrons in the nucleus of an atom

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3
Q

what is a Reactant

A

A substance that takes part in a chemical reaction

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4
Q

what is a Product

A

A substance that is formed in a chemical reaction

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5
Q

what is a Mixture

A

A substance consisting of two or more substances not chemically combined
together, e.g. air is a mixture of nitrogen, oxygen, carbon dioxide and small
amounts of other gases

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6
Q

what is a Compound

A

A substance made up of two or more different elements chemically bonded
together, e.g. water is a compound of hydrogen and oxygen

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7
Q

what are Word Equations

A

An equation that uses only the names of the reactants and products to model
a chemical reaction

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8
Q

what are Symbol Equations

A

An equation that uses the chemical formulae of the reactants and products to
model a chemical reaction

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9
Q

what are Balanced Equations

A

A representation of a chemical reaction using the formulae of the reactants
and products. It shows the number of atoms of each element involved in the
reaction

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10
Q

what are Chemical symbols

A

A letter or series of letters used to represent an element, e.g. C for carbon,
Na for sodium

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11
Q

what is Law of conservation of

mass

A

A letter or series of letters used to represent an element, e.g. C for carbon,
Na for sodium

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12
Q

what are State symbols

A 
An abbreviation used in a symbol equation to show if a reactant or product is 
a solid (s), liquid (l), gas (g) or dissolved in water (aq)
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13
Q

what is a Atom

A

The smallest part of an element that can exist

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14
Q

what is a Nucleus (plural: nuclei)

A

The centre of the atom, consisting of protons and neutrons. It is positively
charged

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15
Q

what is a Proton

A

A particle with a charge of +1 found in the nucleus of the atom. It has the
same mass as a neutron

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16
Q

what is a Electron

A

A particle with a relative charge of -1 and a very small relative mass. It orbits
the nucleus of an atom or ion in energy levels (shells)

17
Q

what is a Neutron

A

A particle with no charge found in the nucleus of the atom. It has the same
mass as a proton

18
Q

what is a Element

A

A substance made of only one type of atom

19
Q

what is a Isotope

A

Atoms of the same element with different numbers of neutrons

20
Q

what is a Electronic Structure

A

The number of electrons in each energy level (shell) of an atom, e.g. a
sodium atom has an electronic structure of 2, 8, 1

21
Q

what is a Energy level (Shells)

A

The distance from the nucleus of an atom where electrons orbit. Also called a
shell

22
Q

what is Electrostatic force

A

The attractive or repulsive force between two charged objects

23
Q

what is a Particle model

A

A model that describes the arrangement and movement of particles in a
substance

24
Q

what is a Atomic model

A

A model to represent the structure of the atom. This model has been revised
over time as new evidence has become available

25
Q

what is a Atomic model

A

The model of the atom suggested by Rutherford. In this model, the mass of
the atom is concentrated at the nucleus, which is positively charged

26
Q

what is a Plum pudding model

A

Thomson’s model of the atom that suggested that the atom is a ball of
positive charge with negative electrons embedded in it

27
Q

what is a Alpha particle scattering experiment

A 
The experiment that suggested that the mass of an atom was concentrated in 
the centre (nucleus) and that the nucleus was charged. The experiment led 
to the nuclear model of the atom, which replaced the plum pudding model
28
Q

what is a Ball and stick mode

A

A model of a molecule that uses spheres to represent atoms and sticks to
represent bonds

29
Q

who is Niels Bohr

A

The scientist who adapted the nuclear model by suggesting that electrons
orbit the nucleus at specific distances

30
Q

who is James Chadwick

A

The scientist who provided experimental evidence to show the existence of
neutrons within the nucleus of an atom

31
Q

what is Chromatography

A

A technique used to separate substances based on their solubility in a
particular solvent

32
Q

what is Mobile phase

A

In chromatography, the solvent that moves, carrying different substances
with it

33
Q

what is Simple Distillation

A

In chromatography, the solvent that moves, carrying different substances
with it

34
Q

what is Fractional distillation

A

A separation technique used to separate miscible liquids with different
boiling points

35
Q

what is Crystillisation

A

A separation technique used to obtain a sample of pure salt from a salt
solution

Chemistry (6 decks)

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