How many structural isomers can you draw for pentane?
Three structural isomers are possible for pentane.
(i) Pentane
CH3 - CH2 - CH2 - CH2 - CH3
(ii) 2 Methyl butane (Isopentane)
(iii) 2,2,dimethyl propane (Neopentane)
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
Outline a project which aims to find the dominant coat colour in dogs.
Draw the structure for the following compounds.
(i) Ethanoic acid (ii) Bromopentane*
(iii) Butanone (iv) Hexanal.
*Are structural isomers possible for bromopentane?
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?
How is the sex of the child determined in human beings?
(a) What property do all elements in the same column of the Periodic Table as boron have in common?
(b) What property do all elements in the same column of the Periodic Table as fluorine have in common?
Calculate the number of electrons constituting one coulomb of charge.
What is an homologous series? Explain with an example.
Why is variation beneficial to the species but not necessarily for the individual?
A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
Explain the meanings of malleable and ductile.
A solution turns red litmus blue, its pH is likely to be
(a) 1 (b) 4 (c) 5 (d) 10
A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens.
Give an example of a double displacement reaction other than the one given in activity 1.10.
Why is variation beneficial to the species but not necessarily for the individual?
Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
Why don’t two magnetic field lines intersect each other?
Name a device that helps to maintain a potential difference across a conductor.
What would be the consequences of a deficiency of haemoglobin in our bodies?
How is the sex of the child determined in human beings?