Fastguy

I don't understand

There are 10 apples in that box. Did I get it right? Ok from what you said I need to find the mass of one molecule, the total mass, and then the mass of one mole. Well I if I subtract the two numbers given I get the total mass of just the Sodium Bicarbonate alone 20.19g-10.02g= 10.17g I'm guessing that from that number, I need to divide something from it to get the mass of one molecule, right? How do I do that tho? Also, how do you find the mass of mole. I thought mole (itself) was just a number or unit. Could you be possibly be talking about moles of SB in a teaspoon. I'm sorry if I'm being confusing, I'm just trying to understand

Ok, I understand that mole is 6.02x 10^23. My teacher gave me this question Moles of Sodium Barcarbonate in a teaspoon Mass of Teaspoon: 10.02g Mass of Teaspoon of Sodium Bicarbonate: 20.19g Sodium Bicarbonate: NaHCO3 what is the mole, molecules, and oxygen atoms. Could someone please explain to me how to do this.I really don't understand

Thank you for replying! Ok looking at my activity series of elements, I see that Tin has more activity than copper. So they will react, right? As a general rule of thumb: metals and metals will react. Are there more comboinations that will work? *Alex*

Hey Guys, I'm new here, my name is Alex. I'm having a lot of trouble with Chemistry and we are doing Reaction Predictions right now. Ok in this worksheet, I'm given a bunch of reactants and I'm expected to: 1. Tell what type of reaction might be expected 2. Whether the reaction will occur or not 3. If not, why it will not occur; then write the symbols and formulas for the reactants 4. If so, what the balanced equation for the reaction is 5. In the case of double displacement reactions, whether the reaction goes to completion or not ok for number 1 they gave me tin and copper (ll) sulfate Sn+ Cu(SO4)2 Ok I have a lot of questions. Did I write that reactant right, if not could you please explain to me what I did wrong. I understand that oxidation numbers come in to play when writing these. Copper is a transititonal element, so what would it's oxidation number be? How do you tell whether or not the reactants will work or not? When it says tell what type of reaction might be expected, I'm guessing it means the possibilities, there can be more than one possible reaction or no? Also when it says In the case of double displacement reactions, whether the reaction goes to completion or not. What is completion and how do you tell when it goes there? There is one other reactant I don't quite understand: electrolyzed Calcium oxide ---------------> What does it mean 'electrolyzed' and what would I do in this situation? Thank you so much for your help. *Alex*