A graph of kinetic energy, in joules ( y - axis) against the square of the speed in (m / s) 2 (x - axis) is plotted for an object…

What is the volume of hydrogen gas formed (measured at room temperature and pressure)when 0.23 g of pure sodium reacts completely with an excess of water?(Ar values: H = 1.0;…

The picture shows a Siamese cat. This type of cat has a gene which is sensitive to temperature. When this gene is inactive in the cells, the coat colour is…

The diagram shows a shape made from a quarter circle of radius 6 cm and a right-angled triangle with a hypotenuse of length 9 cm. Which of the following expressions…

A book rests on a table, which in turn rests on the floor. The floor exerts a force P on the table. Force P and one other force constitute a…

Hydrated copper(II) sulfate has the formula CuSO4·5H2O. 100 cm3 of a solution contained 10 g of hydrated copper(II) sulfate. What is the concentration, in mol / dm3, of this solution?…

The family tree shows the inheritance of freckles. Which row in the table shows the probability that the next child produced by parents 1 and 2, and the probability that…

Express 1 + 1 – 12x x-1 x as a single algebraic fraction. Answer: 20) E 1 + 1 – 12x x-1 x Let us do the first part of…

A swimming pool is 10 m wide. A loud sound is made in the water 2.0 m from one wall and the reflected sounds are detected with a microphone placed…

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:…