click below
click below
Normal Size Small Size show me how
Chem Grp 2 + 7
Reactions and properties of group 2 and 7 elements
Question | Answer |
---|---|
Write the reaction for magnesium with oxygen | Mg (s) + 1/2O2 (g) -> MgO (s) |
What is observed when magnesium burns in oxygen | Bright flame |
What is the product of a reaction between a group 2 metal and chloride | Solid metal chloride XCl2 (s) |
Ca (s) + H2O (l) -> ? | Ca(OH)2 (aq) + H2 (g) |
Be (s) + H2O (l)-> ? | No reaction |
Why does berylium not react with water | an insoluble layer of berylium oxide forms |
Mg (s) + 2H2O (g) -> ? | Mg(OH)2 (aq) + H2 |
Colour change when chlorine is added to iron? | Pale green -> Brown |
Chlorine and bromide ions gives | chloride ions and bromine |
Colour of precipitate formed: bromide ions + silver nitrate? Soluble in concentrated ammonia solution? | Cream. Yes. |
Potassium bromide + sulfuric acid --> ? | KHSO4 + HBr |
All hydrogen halides... | Fume in moist air, react with NH3 to form an ammonium halide and are soluble in water, forming acids |
Bromine is what colour and in what state at RTP | red-brown, gaseous |
Adding PCl5 to an alcohol gives... | steamy fumes of HCl and Haloalkanes |
Name a natural cause of climate change | Dissolving of CO2 in oceans,Solar eruptions, volcanic eruptions, formation of carbonates in rocks |
Name an anthropogenic cause of climate change | Burning fossil fuels, deforestation |
Name five ways in which sustainability can be improved | Use of renewable resources. Finding alternatives to hazardous chemicals. Discovering catalysts for reactions with hihg atom economies. Making more efficine use of energy. Reducing waste and preventing pollution |
Group 2 nitrates decompose to form... | NO2, O2 and Metal oxide |
Which group of substances decompose to form carbon dioxide and a metal oxide | Group 2 carbonates and lithium. NOT group 1 carbonates w/ sodium/below |
Group 2 oxide with nitric acid gives... | X(NO3)2 (aq) + H2O (l) |