Fichas
Atoms, Ions & Compounds
Fichas del conjunto (26)
- 1Atoms ions & compoundsModule 2.2 & 2.3
- 2What is the relative mass and charge of protons, electrons and neutrons? Where are they in an atom?Proton --> 1, +1 & in the nucleus
Neutron --> 1, 0 & in the nucleus
Electron --> 1/2000, -1 & in the shell/orbital - 3Define 'atomic number'The number of protons in the nucleus of an atom.
- 4What is the symbol for atomic number?A
- 5Define 'mass number'The number of protons and neutrons in the nucleus of an atom.
- 6What is the symbol for mass number?Z
- 7Define 'isotope'Atoms of the same element with a different number of neutrons in the nucleus.
- 8How do isotopes react differently?Isotopes of an element all react the same way as they have the same number of electrons - chemical reactions involve electrons not neutrons.
- 9Define 'ion'A positively or negatively charged atom
- 10Has a positive ion lost or gained electrons?Lost, as electrons are negative --> minus a minus = a positive
- 11Do metals usually lose or gain electrons to become ions?Lose, they are usually positively charged ions.
- 12What is the relative atomic mass of an atom 'relative' to?1/12th of the mass of an atom of carbon-12
- 13Therefore, what is the definition of relative atomic mass? (Ar)The weighted mean mass of an atom, compared to 1/12th of the mass of an atom of carbon-12.
- 14What is the definition of relative isotopic mass?The mass of an atom of an isotope, compared with 1/12th of the mass of an atom of carbon-12.
- 15The 'contribution' (amount) of an isotope is measured based on the:-Percentage abundance
-Relative mass of the isotope - 16Which this 'contribution' we can calculate the relative atomic mass of an element with a mixture of isotopes What is the step by step process of doing this?1) Find the percentage of each isotope
2) percentage/100 x RAM (for each isotope)
3) add the result from step 2 for each isotope together
4) This gives you the relative atomic mass of the element as a whole. - 17How can you predict ionic charges?
- 18Some elements can form more than one ion, how is this presented?With roman numerals
e.g Fe(lll) is Fe3+ - 19What is the molecular ion for Ammonium?(NH4)+
- 20Hydroxide?(OH)-
- 21Nitrate?(NO3)-
- 22Hydrogen carbonate(HCO3)-
- 23Carbonate?(CO3)2-
- 24Sulfate?(SO4)2-
- 25Dichromate(Cr7O7)2-
- 26Phosphate?(PO4)3-
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- A level (Module 1/2 - fundamentals in chemistry) Chemistry Fichas sobre Atoms, Ions & Compounds, creado por Holly Sandall el 30/09/2016.
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- Holly Sandall
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