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44 Cards in this Set
- Front
- Back
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atoms are |
the smallest part of an element that can exist |
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an element is |
a substance that can contain only one sort/type of atom |
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compounds contain |
atoms of two or more elements, chemically combined |
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compounds can be separated into component elements by |
chemical reactions or electrolysis |
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chemical formula |
represent compounds, different elements and how many atoms of each element it contains |
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chemical equations |
sum up what has happened during a chemical reaction |
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chemical equations can be |
word equations or balanced symbol equations |
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the reactants are on? and are ? |
the left side, are the substances that react |
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the products are on? are? |
the right side, the new substances formed |
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total mass of the products is equal to, because ? |
total mass of the reactants, because no atoms are lost or made |
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mixtures are |
two or more elements or compounds which are not chemically combined |
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components in a mixture ? |
retain their own properties |
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mixtures are separated by? because |
physical processes because they aren't chemicallycombined |
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filtration ? |
used to separate soluble solids from insoluble solids |
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crystallisation |
used to obtain a soluble solid from a solution |
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simple distillation is |
used to obtain a solvent from a solution |
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fractional distillation is |
used to see rare mixtures where components have different boiling points |
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chromatography is |
used to separate the different soluble coloured components of a mixture |
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label dem (❌10&9) |
1 bunsen burner 2 (distillation) flask 3 adapter ignore this 4 thermometer 5 condenser 6 cold water in 7 cold water out 8 distilled water |
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they used to think atoms looked like a |
plum pudding model |
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label these 🔥 |
A stationary phase (dry paper) B solvent front C insoluble D pencil start line E mobile phase (water) F very soluble |
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there are about how many elements in the period table |
100 |
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which particle was discovered to change the model of the atom (from ppm to rutherford model) |
electrons |
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what's the name of this model of the atom |
plum pudding model |
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what type of particle was fired at the gold atoms in the gold alpha particle experiment |
alpha particles |
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which scientist suggested that electrons orbit the nucleus at specific distances |
Bohr |
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the atomic number is |
the proton number |
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mass numbers are |
the neutrons + the protons |
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neutral atoms have no overall charge because |
they have the same number of protons and electrons |
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which particle has the smallest mass |
electrons (almost 0) |
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the groups are |
columns, how many electrons on outer shell |
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the periods are |
the rows, how many shells the element has |
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group 7 are |
halogens |
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group 8/0 |
noble gases |
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group 1 |
alkali metals |
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atoms that have different number of neutrons but same number of protons |
isotopes |
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describe the plum pudding model |
it says that the atom was a ball of positive charge with electrons embedded in it |
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what model is this |
the rutherford model |
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what model is this |
bohr's model |
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what did chadwick discover |
the neutron |
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why was chadwick discovering the neutron important |
because it explains why the same atoms of an elements may behave differently despite being the same element, which led to a deeper understanding of radioactivity etc |
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who developed the first periodic table |
dmitri mendeleev |
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how is the periodic table ordered |
in order of increasing atomic weighs |
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why were some elements |
o |
