i don't know how to write chemical formulas is it like nomenclature because i need to balance equations (which i know how if the equation is given to me the symbols type but not in words), i need to write skeletal equations but i don't know if they are correct.

example: 2H2+O2->2H2O (i get this )
Potassium chlorate -> potassium chloride +oxygen (i need help with questions like these because i don't know what to write for the numbers for each one but i know my oxyacids)
KClO3->KCl+O2 (i don't know if this is right or not

Yes, KClO3 is potassium chlorate.

The best thing I can tell you to memorize the polyatomic ions. For example,
ClO3^- is chlorate
SO4^2- is sulfate
NO3^- is nitrate etc.
Here is a table. Time and usage will makes this easier.
https://www.google.com/search?q=polyatomic+ion+chart&client=firefox-a&hs=n1z&rls=org.mozilla:en-US:official&channel=sb&tbm=isch&imgil=6kD6mWapCeZ-lM%253A%253Bhttps%253A%252F%252Fencrypted-tbn2.gstatic.com%252Fimages%253Fq%253Dtbn%253AANd9GcQWyyaW4HV75meJYuEVmwqabG5CTR5y62iQ-Vx7WYMCF1in4r_b%253B1128%253B838%253BfEsRx4j33VU5LM%253Bhttp%25253A%25252F%25252Fwww.landerson.net%25252FCHEM%2525252520CH%25252525206%2525252520TUTORIAL.htm&source=iu&usg=__g7AJhdsQvLcZygchx-Ogn13NMG8%3D&sa=X&ei=9u4TU8vPHYyekAeviIE4&sqi=2&ved=0CCsQ9QEwAg&biw=751&bih=436#facrc=_&imgdii=_&imgrc=6kD6mWapCeZ-lM%253A%3BfEsRx4j33VU5LM%3Bhttp%253A%252F%252Fwww.landerson.net%252Fpolyatomic_ion_chart.JPG%3Bhttp%253A%252F%252Fwww.landerson.net%252FCHEM%252520CH%2525206%252520TUTORIAL.htm%3B1128%3B838

Writing chemical formulas involves understanding the rules of nomenclature, as well as knowing how to balance chemical equations. Here's how you can approach it:

1. Nomenclature: Nomenclature is the system of naming chemical compounds. To write chemical formulas, you need to know the symbols and charges of the elements or ions involved. For example:
- Potassium is K⁺, chloride is Cl⁻, and oxygen is O₂. The formula for potassium chloride is KCl, and for oxygen, it's O₂.

2. Balancing equations: To balance equations, you need to ensure that the number of atoms of each element is the same on both sides of the equation. Here's how you can balance the example you provided:
2H₂ + O₂ -> 2H₂O
- Count the number of atoms for each element on both sides. On the left side, you have 2 hydrogen atoms and 2 oxygen atoms. On the right side, you have 4 hydrogen atoms and 2 oxygen atoms.
- To balance the hydrogen atoms, you can put a coefficient of 2 in front of H₂O.
2H₂ + O₂ -> 4H₂O
- Now, you have 4 hydrogen atoms on both sides, but the oxygen atoms are not balanced. There are 2 oxygen atoms on the left side and 8 oxygen atoms on the right side.
- To balance the oxygen atoms, put a coefficient of 5 in front of O₂.
2H₂ + 5O₂ -> 4H₂O
- Now, you have 2 hydrogen atoms and 10 oxygen atoms on both sides, making the equation balanced.

For the given example you provided, Potassium chlorate -> Potassium chloride + Oxygen (KClO₃ -> KCl + O₂), the skeletal equation you wrote is correct. It is balanced because there is one potassium atom, one chlorine atom, and three oxygen atoms on both sides of the equation. However, if you were asked to balance it, you would need to adjust the coefficients until the number of atoms is equal on both sides.

Remember, practicing and understanding the rules of nomenclature and balancing equations will help you become more proficient in writing correct chemical formulas and balanced equations.