Chemistry C1

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  • Created by: Cour.24
  • Created on: 13-05-18 11:32
What are substances made from?
Atoms
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How are chemicals represented in chemistry?
Chemical symbol
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How many elements are there? where might a chemist look these up?
They are 100 different elements and a chemist might look these up on the periodic table.
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What are compounds?
compounds are formed from elements from chemical reactions.
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How would u know if a chemical reaction has taken place?
the formation if one or more new substances which often involve a detectable energy change.
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how might u separate a compound into a separate element?
by chemical reactions
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how do chemists represent chemical reactions?
word equations or equations using symbols and formulae
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what is a mixture?
two or more elements or compounds not chemically combined together
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What can be said about the properties chemicals in mixtures?
the properties of each substance in the mixture are unchanged
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List 5 ways that mixtures might be separated?
-filtrartion, crystalisiation, simple distilation, fractional distilation and chromatography
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what might happen to a scientific model if new evidence is discovered?
it would be changed or replaced.
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before the electron was discovered what did people think atoms were?
tiny spheres that could not be divided.
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what was the name of the atomic model that the electron led to?
the plum pudding model
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what was the plum pudding model of the atom?
the atom is a ball of positive charge with electrons embedded in it
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what did scientists learn about the atom from the alpha particle scattering experiment?
The mass of the atom was in the centre (known as the nucleus), The nucleus was positively charged and electrons were in orbit.
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What model replaced the plum pudding model of the atom
the nuclear model
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how did Niels Bohr adapt the nuclear model of the atom?
he suggested that electrons orbit the nucleus at specific distances.
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What happened next as the atomic model slowly improved?
Later experiments led to the idea that the positive charge of any nucleus could be subdivided into smaller parts.
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What is the given name to the positive particles in the atom?
Protons
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What particle did James Chadwick discover that helped support the new atomic model of atoms?
Neutron
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What is the relative charge on the proton
positive
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what is the relative charge on the neutron
neutral
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what is the relative charge on an eletron
negative
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how do the number of eletrons and number of protons compare in a normal atom?
the number of eletrons is equal to the number of protons
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what is the atomic number of an atom
the bottom number
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what is similar about all atoms of a particular element? (eletrons)
they have the same numbers of protons
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if the number of protons change what happens to the number of eletrons?
you will have a dfferent electron number
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how large are atoms?
10x10-10m
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what is the radius of an atom?
10x10-14m
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what is the realtive mass of a proton?
1
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what is the realtive mass of an neutron?
1
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what is the realtive mass of an electron?
0
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what is the mass number of all atoms?
the protons and electrons added up
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what is an isotope?
atoms of the same element that can have different number of nuetrons
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what is the realtive atomic mass?
adverage number of protons and neutrons in the nucleus
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what energy levels do electrons choose to occupy when no other eletrons are around?
the lowest available energy levels
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how is the electron structure of an atom epresented
numbers or by a diagram
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represent the struture of sodium with numbers and a diagram the atomic number for sodium is 11
draw it *****
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how are elements in the peridodic table arranged?
in order of atomic (proton) number
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how are elements with similar properties aranged?
are in collumns known as groups
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what can be said about the electrons in the outer shells of elements in the same groups
the same number of electrons
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before electrons, protons and neutrons were discovered how did scientists classify elements
by ordering them in their atomic weight
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what happened in the early tables of elements when classifed by weight
thye were incomplete and some were placed in the wrong group
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what did the discovery of isotopes explain?
the order of elements based on their atomic weights were not always correct
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what types of elements help toform positive ions?
metals
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what types of elements help to form negative ions?
non- metals
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where are non-metals found on the periodic table?
towards the right and top of the table
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Card 2

Front

How are chemicals represented in chemistry?

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Chemical symbol

Card 3

Front

How many elements are there? where might a chemist look these up?

Back

Preview of the front of card 3

Card 4

Front

What are compounds?

Back

Preview of the front of card 4

Card 5

Front

How would u know if a chemical reaction has taken place?

Back

Preview of the front of card 5
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