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What is the relative formula mass of sodium chloride?

58.5 Relative formula mass (M r ) is found by adding together the relative atomic masses (A r ) of all the atoms present in a compound. Sodium Chloride is NaCl. The relative atomic masses can be found in the...
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Answered by Jenny S. • Chemistry tutor
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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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