i just don't know where to begin/how

a) Write a balanced chemical equation for: potassium carbonate + magnesium chloride


b) Write a balanced chemical equation for: sulfuric acid + calcium carbonate


c) Write a balanced chemical equation for: sodium sulfate + calcium nitrate


d) Write a balanced chemical equation for: sulfur tetrafluoride + water

first write just the compounds.

K2CO3 + MgCl = KCl + MgCO3

Note you have 2K on the left, but just one on the right. Fix that:

K2CO3 + MgCl2 = 2KCl + MgCO3

Now things match on both sides

Similarly, you can work your way to

H2SO4 + CaCO3 = CaSO4 + CO2 + H2O
Na2SO4 + Ca(NO3)2 = CaSO4 + 2NaNO3
SF4 + 3H2O = H2SO3 + 4HF

a) To write a balanced chemical equation for potassium carbonate + magnesium chloride, follow these steps:

Step 1: Write the chemical formula for each compound:
Potassium carbonate: K2CO3
Magnesium chloride: MgCl2

Step 2: Write the unbalanced equation:
K2CO3 + MgCl2 →

Step 3: Balance the equation by adjusting the coefficients:
K2CO3 + MgCl2 → KCl + MgCO3

The balanced equation is:
K2CO3 + MgCl2 → 2KCl + MgCO3

b) To write a balanced chemical equation for sulfuric acid + calcium carbonate, follow these steps:

Step 1: Write the chemical formula for each compound:
Sulfuric acid: H2SO4
Calcium carbonate: CaCO3

Step 2: Write the unbalanced equation:
H2SO4 + CaCO3 →

Step 3: Balance the equation by adjusting the coefficients:
H2SO4 + CaCO3 → CaSO4 + H2O + CO2

The balanced equation is:
H2SO4 + CaCO3 → CaSO4 + H2O + CO2

c) To write a balanced chemical equation for sodium sulfate + calcium nitrate, follow these steps:

Step 1: Write the chemical formula for each compound:
Sodium sulfate: Na2SO4
Calcium nitrate: Ca(NO3)2

Step 2: Write the unbalanced equation:
Na2SO4 + Ca(NO3)2 →

Step 3: Balance the equation by adjusting the coefficients:
Na2SO4 + Ca(NO3)2 → CaSO4 + NaNO3

The balanced equation is:
Na2SO4 + Ca(NO3)2 → CaSO4 + 2NaNO3

d) To write a balanced chemical equation for sulfur tetrafluoride + water, follow these steps:

Step 1: Write the chemical formula for each compound:
Sulfur tetrafluoride: SF4
Water: H2O

Step 2: Write the unbalanced equation:
SF4 + H2O →

Step 3: Balance the equation by adjusting the coefficients:
SF4 + 2H2O → H2SO4 + 4HF

The balanced equation is:
SF4 + 2H2O → H2SO4 + 4HF

To write balanced chemical equations, you need to follow a few steps. Here's how you can approach it:

Step 1: Identify the reactants and products.
In each equation, we have two reactants coming together to form products. So the first step is to identify the reactants and products.

Step 2: Write the chemical formulas for the reactants and products.
For example, potassium carbonate has the chemical formula K2CO3, magnesium chloride has the formula MgCl2, sulfuric acid is H2SO4, calcium carbonate is CaCO3, sodium sulfate is Na2SO4, calcium nitrate is Ca(NO3)2, sulfur tetrafluoride is SF4, and water is H2O.

Step 3: Balance the equation.
To balance the equation, you need to ensure that the number of atoms of each element is the same on both sides of the equation. Start by balancing the elements that appear in the lowest number.

a) potassium carbonate + magnesium chloride
K2CO3 + MgCl2 -> KCl + MgCO3

b) sulfuric acid + calcium carbonate
H2SO4 + CaCO3 -> CaSO4 + H2O + CO2

c) sodium sulfate + calcium nitrate
Na2SO4 + Ca(NO3)2 -> NaNO3 + CaSO4

d) sulfur tetrafluoride + water
SF4 + 2H2O -> H2SO4 + 4HF

Step 4: Check the balanced equation.
After writing the balanced chemical equation, it's important to check if the equation is balanced correctly. Count the number of each element on both sides of the equation to ensure they are equal.

Remember that practice makes perfect, and with time, you'll become more comfortable with balancing equations.

What's your trouble here. You need to learn to do this yourself. I'll be glad to help you through.