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3. yung pic
4.A solid dissolves in a liquid when it mixes completely with the liquid. The solid has broken down into pieces so small that its particles spread all throughout the new mixture. The solid and liquid will stay mixed without shaking.
Everything dissolves in water.
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6.Maybe not anything. Vinegar is an aqueous solution of acetic acid - CH3COOH - which is a weak acid. (A weak acid is one that only partially ionizes in water. Compare that to a strong acid which ionizes completely.)
Some substances react with acids (like metals, bases and carbonates), while others don’t react at all.
Mg(s) + CH3COOH(aq) → (CH3COO)2Mg(aq) + H2(g)
CH3COOH(aq) + NaOH(aq) → CH3COONa(aq) + HOH(l)
CH3COOH(aq) + NaHCO3(aq) → CH3COONa(aq) + CO2(g) + H2O(l)