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(Using a diagram of energy changes) The simplest way of thinking about it is that exothermic reactions release energy, such as heat, to the surroundings whereas endothermic reactions absorb energy from th...

H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
Concordant titres: 26.15 cm³ and 26.25 cm³
Mean titre: (26.15+26.25)/2= 26.2 cm^3...

To work this out we need the equation:
Number of moles = Mass (in grams) / Mr (relative formula mass)
We know the mass of carbon dioxide already (88g). We need to work out the Mr of carbon dioxi...

Alkali metal have 1 outer electrons. Reactivity increases down the coloumn.

Elements are arranged in rows, referred to as periods, of increasing atomic number. To recap, atomic number is the number of protons in the nucleus of an atom. Elements are also arranged in columns, refer...