Zadanie 3b
Suggest why the times measured for equal masses of the two metals are not a valid basis for comparing their reactivity.
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Suggest why the times measured for equal masses of the two metals are not a valid basis for comparing their reactivity.
When sodium burns in excess oxygen, the main product is sodium peroxide, Na2O2. Determine the percentage covalent character and the bonding type in sodium peroxide using sections 9 and 17 of the data booklet.
Sodium peroxide, Na2O2, contains the peroxide ion. Draw the Lewis formula of this anion.
A sealed flask contains 8.0 g of helium and 120 g of argon. What is the ratio of the number of atoms of argon to the number of atoms of helium in the flask? A. 0.067 B. 0.67 C. 1.5 D. 15
Write an equation for the complete combustion of C19H40.
The enthalpy of combustion of C19H40 is −12 660 kJ mol−1. (i) Calculate the maximum energy released when 1.50 g of C19H40 is burned completely. (ii) Determine the maximum temperature increase when 400.0 cm3 of water…
Explain why a fuel produced from recently grown plants (a biofuel) contributes less to climate change than a fossil fuel.
In an oil refinery, nonadecane can be cracked into smaller molecules. Consider the reaction: C19H40(g) → 3 C3H6(g) + C10H22(g) Determine the standard enthalpy change, ΔH⊖, for this reaction using section 12 of the data booklet.
Propene can be converted into propan-2-ol in a single reaction. State the equation for this conversion.
Propan-2-ol reacts with tetradecanoic acid to produce propan-2-yl tetradecanoate, an ester used in skin creams. C13H27COOH(l) + CH3CH(OH)CH3(l) ⇌ C13H27COOCH(CH3)2(l) + X(l) (i) Identify the by-product X(l). (ii) Calculate the atom economy of this…