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Chemistry

Topic 1

QuestionAnswer
What is the mass number of Mg ? 24.3
What is a relative atomic mass? It is the weighted mean mass of an atom of an element compared with 1/12 of the mass of carbon-12.
What is an acid? Proton donor
What is a base? Proton acceptor.
Another name of positively charged ions? Cations
What products will we get if acid+carbonate reacts? salt-CO2-H2O
What is the oxidation number ? It is the number of electrons that an atom uses to bond with atoms of another element.
What are reactants of equation N2+H2=NH3? N2 and H2
What is the formula for Sulfuric acid? H2SO4
If we drop an indicator into a base,and it becomes pink,what indicator is it? Phenolphtalein
What is oxidation? Loss of electrons or an increase in oxidation number.
What is reduction? Gain of electrons or a decrease on oxidation number.
What is a redox reaction? A reaction in which both reduction and oxidation take place.
What is an oxidation number of N in HNO3? +5
Calculate the mass in g. in 5 mol KOH? 280.5
Which one is a half equation: 1)Mg=Mg2+ + 2e- 2)2HCL+CaCO3=CaCl 2 + H2O + CO2 1
What is a relative molecular mass of Al(OH)3? 68
Created by: Nikita Udalov