Live practice

A \(0.3780\,\mathrm{g}\) chloro-organic compound gives \(0.5740\,\mathrm{g}\) AgCl in Carius analysis. Determine its chlorine percentage.

The reaction, CO(g) + 3H2(g) CH4(g) + H2O(g) is at equilibrium at 1300 K in a 1L flask. It also contain 0.30 mol of CO, 0.10 mol of H2 and 0.02 mol of H2O and an unknown amount of CH4 in the flask. Determine the concentration of CH4 in the mixture. The equilibrium constant, Kc for the reaction at the given temperature is 3.90.

State the conditions for combining atomic orbitals into molecular orbitals.

Which statement about periodic-table blocks is incorrect?

Calculate the energy for He⁺(g) → He²⁺(g) + e⁻, given hydrogen's ground-state ionisation energy 2.18 × 10⁻¹⁸ J atom⁻¹.

A gaseous welding fuel contains only carbon and hydrogen. Burning it gives \(3.38\,\mathrm{g}\) CO₂ and \(0.690\,\mathrm{g}\) H₂O. At STP, 10.0 L of the gas has a mass of \(11.6\,\mathrm{g}\). Determine

Find the derivative of f(x)=x at x=1.

Find every point on the x-axis whose distance from \(\frac{x}{3}\)+\(\frac{y}{4}\)=1 is 4 units.

For \(A=\{1,2,3,4\}\), \(B=\{1,5,9,11,15,16\}\), and \(f=\{(1,5),(2,9),(3,1),(4,5),(2,11)\}\), decide whether \(f\) is (i) a relation from \(A\) to \(B\)(ii) a function from \(A\) to \(B\).

With \(U=\{a,b,c,d,e,f,g,h\}\), find the complements of \(A=\{a,b,c\}\), \(B=\{d,e,f,g\}\), \(C=\{a,c,e,g\}\), and \(D=\{f,g,h,a\}\).