Propanoic acid is a monoprotic acid. Magnesium is a Group 2 metal. Which of the following chemical equations is correct for the reaction between magnesium carbonate and propanoic acid? Answer:…
The diagram shows an external view of the human heart. Which of the following statements about the artery shown on the diagram is/are correct?1 It is the site of diffusion…
The acceleration due to gravity at the surface of a planet is given by 2RGMg = , where M and Rare the mass and radius of the planet respectively, and…
Uranium-238 is a naturally-occurring alpha emitter. It can be used in the manufacture of the isotope plutonium-239, during which it is bombarded by neutrons. The process of converting a nucleus…
Disproportionation is the simultaneous oxidation and reduction of the same species in areaction.In which of the following chemical equations does disproportionation occur?1 Fe + CuCl2 → FeCl2 + Cu2 Cu…
Dolly the sheep was born in 1996. She was unusual because she had no biological father. Sheep have a diploid number of 54 chromosomes in their body cells. The diagram…
In triangle PRS, line QT is parallel to side RS.RS = 1.5 cmTS = 1.8 cmQT = 0.3 cmWhat is the length of PS? Answer: 12) F To solve this…
Two resistors R1 and R2 are connected in series with a cell. Resistor R1 has twice the resistance of resistor R 2. Six statements about this circuit are given below.1…
A piece of magnesium ribbon is dropped into a beaker of dilute aqueous hydrochloric acid at room temperature. After a while the production of bubbles of gas slows down. Which…
The diagram shows four experiments used to investigate movement of substances across dialysis tubing. This tubing is a partially permeable membrane which allows both glucose and water to pass through…