Here is the example in video form.. We’re asked to write the formula for calcium carbonate Write the formula for calcium carbonate Ca 2+ CO 3 2– +2 –2.

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Presentation transcript:

Here is the example in video form.

We’re asked to write the formula for calcium carbonate Write the formula for calcium carbonate Ca 2+ CO 3 2– +2 –2 Total Positive Charge Total Negative Charge

We start by finding calcium on the periodic table. Write the formula for calcium carbonate Ca 2+ CO 3 2– +2 –2 Total Positive Charge Total Negative Charge

It’s ion has only one possible charge, positive 2. (click) So its just Ca 2 plus Write the formula for calcium carbonate Ca 2+ CO 3 2– +2 –2 Total Positive Charge Total Negative Charge

The second word carbonate, ends in “Ate”, Write the formula for calcium carbonate Ca 2+ CO 3 2– +2 –2 Total Positive Charge Total Negative Charge

so it must be a polyatomic ion Write the formula for calcium carbonate Ca 2+ CO 3 2– +2 –2 Total Positive Charge Total Negative Charge It must be a polyatomic ion

Looking on the ion table, we see that carbonate is CO3 with a negative 2 charge. Formulas and Charges of Common Ions calcium carbonate

So we’ll write CO3 2 minus here Write the formula for calcium carbonate Ca 2+ CO 3 2– +2 –2 Total Positive Charge Total Negative Charge

With one calcium ion and one carbonate ion, (click) The total positive charge is positive two Write the formula for calcium carbonate Ca 2+ CO 3 2– +2 –2 Total Positive Charge

And the total negative charge is negative 2 Write the formula for calcium carbonate Ca 2+ CO 3 2– +2 –2 Total Positive Charge Total Negative Charge

These add up to zero, so they are balanced. Write the formula for calcium carbonate Ca 2+ CO 3 2– +2 –2 Total Positive Charge Total Negative Charge These add up to zero

So the formula is just CaCO3. Write the formula for calcium carbonate Ca 2+ CO 3 2– Formula: CaCO 3

Because there is only one carbonate ion in the formula Write the formula for calcium carbonate Ca 2+ CO 3 2– Formula: CaCO 3 Only 1 carbonate ion in the formula, so no brackets!

No brackets are needed around the CO3 in the formula. Write the formula for calcium carbonate Ca 2+ CO 3 2– Formula: CaCO 3 Only 1 carbonate ion in the formula, so no brackets!

So the final answer is: The formula for calcium carbonate is (Click) CaCO3 Write the formula for calcium carbonate Ca 2+ CO 3 2– Formula: CaCO 3