Top answers

Providing reasoning, what is the trend in the atomic radius of row 3 elements across the periodic table?

Decreasing atomic radius across the periodic table. - greater number of protons in the nucleus resulting in a greater nuclear charge. - little/no change in shielding. - electrons added to same shell. - overa...
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Answered by Jenny S. • Chemistry tutor
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Why are alkanes saturated and alkenes unsaturated?

Alkanes are saturated because they contain only single covalent bonds. Alkenes are unsaturated because they do have double covalent bonds.
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Answered by Calum M. • Chemistry tutor
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Why do the muscles of the Iris contract and relax?

To alter the size of the pupil, so the correct intensity of light is allowed through. Enough light is let through to allow clear vision, but not so much light that the retina might become damaged.
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Answered by Calum M. • Biology tutor
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Which state can a substance NOT be in if heat transfer through convection is occurring?

Solid.
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Answered by Calum M. • Physics tutor
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What is an enzyme and what effect does temperature have on enzyme activity? (6 marks)

An enzyme is a globular protein that acts as a biological catalyst. They work by reducing the activation energy of chemical reactions, which increases the rate of reactions. All enzymes have an optimum tempe...
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Answered by Isabel O. • Biology tutor
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