When molecules collide, for a reaction to take place, two conditions must be met. Firstly, theymust have sufficient energy to react and secondly, they must have the right orientation. Thismeans…
Look at the equation for making chlorine gas and decide which answer will provide you with the numbers to balance itaKMnO4 + bHCl aKCl + aMnCl 2 + xH2O…
Carbon, in the form of coke, is used to reduce iron oxide in a blast furnace. The three stages are shown below:1 C + O2 → CO22 CO2 + C…
The oscillation period, t, for a spiral spring (weight w, radius R made from wire length l, radius r with a modulus of rigidity n) with a weight W hanging…
The sides of triangle ABC are as follows: AB = 3, AC = 2, BC = 4. Use the cosine rule, a^2=b^2+c^2-2bc cosA , to find the cosine of ∠BAC…
Using the formula:z = xy^2 Answer: 6) C z = xy² y² = 1.2 x 10¹³ 3 x 10⁻⁶ 1.2 x 10¹³ = 3 x 10⁻⁶ (y²) y²…
The diagram shows a section through the thorax. When breathing out (expiring), what happens to the muscles at X and Y and the pressure at Z? Answer: 6) E The…
A horse of weight 6000N gallops at a speed of 16 m/s. Taking the acceleration of free fallas 10m/s2, calculate the kinetic energy of the horse. (Give your answer in…