Are these correct also?

Ammonium Chloride : NH4Cl
Nitrogen Dioxide : NO2
Hydroiodice Acid : HI
Stannous Iodide : SnI2
Perchloric Acid : HClO4
Sulfur Trioxide : SO3
Chromium (III) Oxide : Cr2O3

Nitric Acid : HNO3
Diphosphorous Pentoxide: P205
Mercurous Chloride : Hg2Cl2
Diphosphorous Trioxide : PsO3
Barium Permanganate : Ba(MnO4)2
Carbon Tetrahydride : CH4

Potassium Nitrate : KNO3
Sodium Hydride : NaH
Sulfurous Acid: H2SO3
Scandium (III) Hydroxide : ScOH3
Sulfur Hexachloride : SCl6
Periodic Acid : HIO4
Hypochlorous Acid : HClO

Carbon Monoxide : CO
Dihydrogen Monoxide : H20
Cesium Carbonate : CsCO3
Ferric Perchlorate : Fe(ClO4)3
Radium Nitrate : Ra(NO3)2

Ammonium Chloride : NH4Cl

Nitrogen Dioxide : NO2
Hydroiodice Acid : HI hydroiodic acid
Stannous Iodide : SnI2
Perchloric Acid : HClO4
Sulfur Trioxide : SO3
Chromium (III) Oxide : Cr2O3

Nitric Acid : HNO3
Diphosphorous Pentoxide: P205
spelling--diphosphorus pentoxide
Mercurous Chloride : Hg2Cl2
Diphosphorous Trioxide : PsO3
spelling & formula--diphosphorus trioxide: P2O3
Barium Permanganate : Ba(MnO4)2
Carbon Tetrahydride : CH4
common name is methane

Potassium Nitrate : KNO3
Sodium Hydride : NaH
Sulfurous Acid: H2SO3
Scandium (III) Hydroxide : ScOH3
Sc(OH)3. Sc is +3 and OH is -1; the parentheses must be around the entire OH to show that it is 3O and 3H.
Sulfur Hexachloride : SCl6
Periodic Acid : HIO4
Hypochlorous Acid : HClO

Carbon Monoxide : CO
Dihydrogen Monoxide : H20
common name is water
Cesium Carbonate : CsCO3
formula is Cs2CO3
Ferric Perchlorate : Fe(ClO4)3
Radium Nitrate : Ra(NO3)2

Yes, the chemical formulas listed appear to be correct. Here is how you can verify the formulas:

To determine chemical formulas, you need to know the valence or oxidation state of the elements involved. For example:

- Ammonium Chloride: Ammonium (NH4+) has a charge of +1, while Chloride (Cl-) has a charge of -1. So, to balance the charges, you need one ammonium ion and one chloride ion, resulting in NH4Cl.

- Nitrogen Dioxide: Nitrogen typically has a charge of -3, while Oxygen has a charge of -2. Therefore, to balance the charges, you need one nitrogen atom and two oxygen atoms, resulting in NO2.

- Hydroiodic Acid: Hydrogen typically has a charge of +1, and Iodine typically has a charge of -1. Thus, you need one hydrogen ion and one iodide ion, resulting in HI.

By following similar charge balancing principles, you can confirm the correctness of all the other given chemical formulas.