Please balance these chemical equations: 1) KI + Br2 -> KBr + I2 2) BaCl2 + Na2SO4 -> BaSO4 + NaCl 3) SO2 + H2O -> H2SO3 4) H2S + Na -> Na2S + H2 5) Al + S -> Al2S3

Let's balance the chemical equations step by step:

1. Equation 1: KI + Br₂ -> KBr + I₂

   To balance this equation, we need to ensure that the number of atoms of each element is the same on both sides.

   Balanced equation: 2KI + Br₂ -> 2KBr + I₂

   Explanation: We put a coefficient of 2 in front of KI and KBr to balance the potassium (K) and iodine (I) atoms.

2. Equation 2: BaCl₂ + Na₂SO₄ -> BaSO₄ + NaCl

   To balance this equation, we need to ensure that the number of atoms of each element is the same on both sides.

   Balanced equation: BaCl₂ + Na₂SO₄ -> BaSO₄ + 2NaCl

   Explanation: We put a coefficient of 2 in front of NaCl to balance the chlorine (Cl) and sodium (Na) atoms.

3. Equation 3: SO₂ + H₂O -> H₂SO₃

   This equation is already balanced.

   Balanced equation: SO₂ + H₂O -> H₂SO₃

   Explanation: The number of sulfur (S), oxygen (O), and hydrogen (H) atoms are the same on both sides.

4. Equation 4: H₂S + Na -> Na₂S + H₂

   To balance this equation, we need to ensure that the number of atoms of each element is the same on both sides.

   Balanced equation: H₂S + 2Na -> Na₂S + H₂

   Explanation: We put a coefficient of 2 in front of Na to balance the sodium (Na) atoms.

5. Equation 5: Al + S -> Al₂S₃

   To balance this equation, we need to ensure that the number of atoms of each element is the same on both sides.

   Balanced equation: 2Al + 3S -> Al₂S₃

   To balance this equation, we need to ensure that the number of atoms of each element is the same on both sides.

   Explanation: We put a coefficient of 2 in front of Al and 3 in front of S to balance the aluminum (Al) and sulfur (S) atoms.

Here are the balanced equations:

1. 2KI + Br₂ -> 2KBr + I₂
2. BaCl₂ + Na₂SO₄ -> BaSO₄ + 2NaCl
3. SO₂ + H₂O -> H₂SO₃
4. H₂S + 2Na -> Na₂S + H₂
5. 2Al + 3S -> Al₂S₃

Final Answer:

1. 2KI + Br₂ -> 2KBr + I₂
2. BaCl₂ + Na₂SO₄ -> BaSO₄ + 2NaCl
3. SO₂ + H₂O -> H₂SO₃
4. H₂S + 2Na -> Na₂S + H₂
5. 2Al + 3S -> Al₂S₃