Question

1. write out the chemical formulas lithium bromide potassium nitride ammonium hydroxide calcium phosphate aluminum chloride calcium hydroxide ammonium perchlorate sodium nitrate tin (ii) chloride potassium nitrate iron (iii) chloride manganese (iv) chloride lead (ii) nitrate magnesium oxide aluminum oxide

Explanation:

Lithium bromide

Lithium has a charge of \(+1\) (\(Li^{+}\)) and bromide has a charge of \(-1\) (\(Br^{-}\)). Using the criss - cross method (charges' magnitudes swap as sub - scripts), the formula is \(LiBr\).

Potassium nitride

Potassium has a charge of \(+1\) (\(K^{+}\)) and nitride has a charge of \(-3\) (\(N^{3 -}\)). Using the criss - cross method, the formula is \(K_{3}N\).

Ammonium hydroxide

Ammonium ion has a charge of \(+1\) (\(NH_{4}^{+}\)) and hydroxide ion has a charge of \(-1\) (\(OH^{-}\)). Using the criss - cross method, the formula is \(NH_{4}OH\).

Calcium phosphate

Calcium has a charge of \(+2\) (\(Ca^{2+}\)) and phosphate has a charge of \(-3\) (\(PO_{4}^{3 -}\)). Using the criss - cross method, the formula is \(Ca_{3}(PO_{4})_{2}\).

Aluminum chloride

Aluminum has a charge of \(+3\) (\(Al^{3+}\)) and chloride has a charge of \(-1\) (\(Cl^{-}\)). Using the criss - cross method, the formula is \(AlCl_{3}\).

Calcium hydroxide

Calcium has a charge of \(+2\) (\(Ca^{2+}\)) and hydroxide has a charge of \(-1\) (\(OH^{-}\)). Using the criss - cross method, the formula is \(Ca(OH)_{2}\).

Ammonium perchlorate

Ammonium ion has a charge of \(+1\) (\(NH_{4}^{+}\)) and perchlorate has a charge of \(-1\) (\(ClO_{4}^{-}\)). Using the criss - cross method, the formula is \(NH_{4}ClO_{4}\).

Sodium nitrate

Sodium has a charge of \(+1\) (\(Na^{+}\)) and nitrate has a charge of \(-1\) (\(NO_{3}^{-}\)). Using the criss - cross method, the formula is \(NaNO_{3}\).

Tin (II) chloride

Tin (II) has a charge of \(+2\) (\(Sn^{2+}\)) and chloride has a charge of \(-1\) (\(Cl^{-}\)). Using the criss - cross method, the formula is \(SnCl_{2}\).

Potassium nitrate

Potassium has a charge of \(+1\) (\(K^{+}\)) and nitrate has a charge of \(-1\) (\(NO_{3}^{-}\)). Using the criss - cross method, the formula is \(KNO_{3}\).

Iron (III) chloride

Iron (III) has a charge of \(+3\) (\(Fe^{3+}\)) and chloride has a charge of \(-1\) (\(Cl^{-}\)). Using the criss - cross method, the formula is \(FeCl_{3}\).

Manganese (IV) chloride

Manganese (IV) has a charge of \(+4\) (\(Mn^{4+}\)) and chloride has a charge of \(-1\) (\(Cl^{-}\)). Using the criss - cross method, the formula is \(MnCl_{4}\).

Lead (II) nitrate

Lead (II) has a charge of \(+2\) (\(Pb^{2+}\)) and nitrate has a charge of \(-1\) (\(NO_{3}^{-}\)). Using the criss - cross method, the formula is \(Pb(NO_{3})_{2}\).

Magnesium oxide

Magnesium has a charge of \(+2\) (\(Mg^{2+}\)) and oxide has a charge of \(-2\) (\(O^{2 -}\)). Using the criss - cross method (simplifying the sub - scripts), the formula is \(MgO\).

Aluminum oxide

Aluminum has a charge of \(+3\) (\(Al^{3+}\)) and oxide has a charge of \(-2\) (\(O^{2 -}\)). Using the criss - cross method, the formula is \(Al_{2}O_{3}\).

Answer:

Lithium bromide: \(LiBr\)
Potassium nitride: \(K_{3}N\)
Ammonium hydroxide: \(NH_{4}OH\)
Calcium phosphate: \(Ca_{3}(PO_{4})_{2}\)
Aluminum chloride: \(AlCl_{3}\)
Calcium hydroxide: \(Ca(OH)_{2}\)
Ammonium perchlorate: \(NH_{4}ClO_{4}\)
Sodium nitrate: \(NaNO_{3}\)
Tin (II) chloride: \(SnCl_{2}\)
Potassium nitrate: \(KNO_{3}\)
Iron (III) chloride: \(FeCl_{3}\)
Manganese (IV) chloride: \(MnCl_{4}\)
Lead (II) nitrate: \(Pb(NO_{3})_{2}\)
Magnesium oxide: \(MgO\)
Aluminum oxide: \(Al_{2}O_{3}\)