Live practice

In cyanogen each carbon is +3. The products place carbon at +2 in CN⁻ and +4 in CNO⁻, so identical reactant molecules are both reduced and oxidised.

Solids do not appear in Kp, so Kp=pCO₂/pCO. If x shifts left, pressures become 0.80−x and 1.40+x.

Use ΔG°=−RT lnK.

Hydrogen forms one bond, carbon four and oxygen two in the neutral molecule. The methyl carbon has three C–H single bonds; the carbonyl carbon is double-bonded to one O and single-bonded to –OH.

Across period 2 the stronger nuclear attraction makes F more exothermic than O. Cl is more exothermic than F because the compact F 2p shell has unusually high incoming-electron repulsion.

For a non-relativistic particle, λ=h/(mv).

Retain the first three significant digits and use the next digit to decide whether the last retained digit increases.

Apply the work–energy theorem and evaluate the speed at each endpoint.

Translate every condition into an equation and retain exact values throughout the straight-line calculation.

The last line satisfies the original conditions and supplies every requested part.

1. A function: each first coordinate occurs once. Domain \(\{2,5,8,11,14,17\}\), range \(\{1\}\).
2. A function. Domain \(\{2,4,6,8,10,12,14\}\), range \(\{1,2,3,4,5,6,7\}\).
3. Not a function: input 1 has two images, 3 and 5.