Write the chemical formulas of these compounds. 1. Rubidium nitride 2. Potassium selenite 3. Rubidium sulfite 4. Rubidium nitrate 5. Magnesium sulfite

I’m trying to help my son with high school ninth grade chemistry. Could you please help us with this chart so we can study properly for his test. We do not understand cation and anion. 

Name each covalent compound. a. PBr 3 b. SO 3 c. NCl 3 d. P 2S 5

Imagine two new elements have been discovered with symbols Q and Z. Q is in group 2A and Z is in group 7a on the periodic table. What is the formula of the ionic compound that these two elements can form? Q₂Z₂ QZ₂ Q₂Z QZ ZQ₂ O Z₂Q2 O Z₂Q

Submitting 2nd time as I was asked to resubmit to obtain help with the rest. Thank you.

Based on their molecular masses, match the correct molar mass with each molecule. CO Fe CO₂ Fe₂0₁ a C d 1 mol 55.85 g 1 mol 28.01 g 1 mol 44.01 g 1 mol 159.70 g

Explain how an ionic compound is formed composed of these elements 1. strontium and fluorine 2. aluminum and sulfur 3. cesium and phosphorous

Predict the formula for each ionic compound. (Recall the polyatomic ions in the table below.) Some Common Polyatomic Ions Name Formula Acetate C2H3O2− Hydrogen carbonate HCO3− Hydroxide OH− Nitrate NO3− Carbonate CO32− Sulfate SO42− Phosphate PO43− Ammonium NH4+ Note: The names of positive polyatomic ions end in -ium. Many negative polyatomic ions have names ending in -ate. Another name for the hydrogen carbonate ion is bicarbonate. (a) radium nitrate   chemPad Help                   (b) barium phosphate   chemPad Help                   (c) cesium iodide   chemPad Help                   (d) gallium phosphide   chemPad Help                   (e) aluminum nitride   chemPad Help                   (f) lithium sulfate   chemPad Help