Chemistry Homework Assistance
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- 3. List the differences between the 4 types of mixtures. Include an example of each.
- (ii) Potassium ions, K^+, are formed from potassium atoms. Describe how a potassium atom forms a potassium ion. __ (b) Potassium chloride can be made by reacting potassium with chlorine. The equation for the reaction is 2K+Cl_(2)arrow 2KCl Calculate the mass of potassium needed to make 1.492 g of potassium chloride. (Relative formula mass of potassium chloride=74.6) (Relative atomic mass of potassium=39.1) Show your working.
- 2 Bromine reacts with iron to form iron(III) bromide. (a) (i) Identify the structure of iron (Vert vert ) bromide. A giant ionic B giant metallic C giant molecular D simple molecular (ii) Add numbers to balance the equation for the reaction between iron and bromine. (1) ldots ldots Fe+ldots ldots Br_(2)arrow 2FeBr_(3) (b) Bromine and gallium are in period 4 of the periodic table. The electronegativity of the elements in period 4 changes across the period. Explain how the electronegativity changes from gallium to bromine. (4) (1)
- 5 A selection of metals were added to dilute acid. The temperature of the reaction was recorded before and after the metal was added. Which metal is the most reactive? B C D A Metal & }(c) Temperature before / ( )^circ mathrm(C) & Maximum temperature after / ( )^circ mathrm(C) A & 23.0 & 27.5 B & 22.5 & 29.0 C & 23.0 & 26.0 D & 24.5 & 30.0
- 1 Acids can react with bases.Which type of reaction happens when an acid reacts with a base? neutralisation decomposition polymerisation combustion