Flashcards
Chemistry Revison
Cards in this deck (35)
- 1What is an element?An element is an atom which has the same number of protons in its nucleus
- 2What is a compoundA compound is a chemical substance which contains two or more different elements chemically combined in a fixed proportion
- 3How do you separate a compoundTo separate a compound you need to use a chemical reaction
- 4What is in a mixtureIn a mixture, there are different elements of compounds not chemically combined
- 5How do you separate a mixtureTo separate a mixture you need to use a physical technique
- 6What is a moleculea group of atoms bonded together
- 7How do elements occurElements with similar properties occur at regular intervals
- 8What is an ionAn ion is an atom which has an overall charge
- 9What is a positive ionAn atom which has lost electrons
- 10What is a negative ionAn atom which has gained electrons
- 11What is an isotopeIsotopes are atoms of an element with different numbers of neutrons
- 12What is the mass number an atomic number 7 LI 37 = mass number
3= atomic numebr - 13What does the atomic number showprotons
electrons - 14What does the mass number showthe total amount of protons + neutrons
- 15Who was John NewlandsA British chemist who published his concept of the periodic table
- 16What did John Newlands concept includeThe law octaves
He pointed out that every eighth element in this grouping shared a resemblance - 17Who was Dmitri Mendeleev?Dmitri Mendeleev was a Russian chemist
- 18What did Dmitri Mendeleev's concept includeall the known chemical elements were arranged in order of increasing atomic weight, the resulting table displayed a recurring pattern. He left gaps in places where he believed unknown elements would find their place.,. He predicted the likely properties of three of the potential elements.
- 19How do you calculate the relative atomic massthe mass number of isotope 1 x percentage abundance 1
+
the mass number of isotope 2 x percentage abundance 2
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100 - 20What is ionic bondingIonic bonding is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions
- 21What is an ionA compound which is formed from a metal and non-metal consists of ions
- 22Ionic bonding within group 1 metalsgroup 1 metals lose 1 electron forming a +1 ion
- 23Ionic bonding with Group 7 non-metalsgroup 7 non-metals gain 1 electron forming a -1 ion
- 24what is protons charge+1
- 25what is protons mass1
- 26what is neutrons charge0
- 27what is neutrons mass1
- 28what is electrons charge-1
- 29what is electrons massvery small
- 30What does the plum pudding model suggestan atom is a ball of positive charge with negative electrons embedded in it
- 31What was the alpha scattering experimentTiny particles were fired at the gold foil. Most of the alpha particles went straight through without changing direction showed that atoms are mainly empty space. Some of the alpha particles were deflected therefore the center of the atom must have a positive charge. Sometimes an alpha particle bounced back which showed that the atom must be concentrated in the centre
- 32What did James Chadwick discoverHe discovered that the nucleus also contains neutrons which are neutral and have no charge
- 33What did Niels Bohr discoverHe discovered that electrons orbit the nucleus at a specific distance. Bohrs worked agreed with the results of experiments by other scientists
- 34Why do elements reactElements react in order to achieve a full outer energy level. They achieve the electronic structure of a noble gas
- 35—
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- GCSE Chemistry Flashcards on Chemistry Revison, created by angel kakande on 09/06/2019.
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