Chemistry questions? 10 points first right answer?





1.How many atoms of oxygen are in one formula unit of Al2(SO4)3? 4 6 7 122.Which of the following is not a name of a valid chemical formula? carbon chloride nitrogen monoxide copper (II) carbonate chloric acid3.If the formula for a compound is represented by XY2 and the charge on the Y ion is -2, what is the charge in the X ion? +1 +2 +3 +44.What is the name of SnF2? tin fluoride tin (I) fluoride tin (II) fluoride tin (IV) fluorideQuestion 5 (Multiple Choice Worth 2 points)What is the name of SnF2? tin fluoride tin (I) fluoride tin (II) fluoride tin (IV) fluorideQuestion 6 (Essay Worth 2 points)What is the formula for calcium nitrate? Question 7 (Multiple Choice Worth 2 points)What is the formula for iron (II) nitride? FeN Fe2N Fe2N3 Fe3N2Question 8 (Multiple Choice Worth 2 points)Which of the following contains ionic bonding? H2O2 CaO CO32- P2O5Question 9 (Multiple Choice Worth 2 points)What is the name of the acid HClO2? hydrochloric acid hypochlorous acid chloric acid chlorous acidQuestion 10 (Multiple Choice Worth 2 points)Which of the following contains both ionic and covalent bonding? KOH N2O5 CH4 HBr





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3 Responses to “Chemistry questions? 10 points first right answer?”

  1. chamisos says:

    1) You have to find out how many oxygens is in the formula. All of the oxygens are in the SO4s. There are four oxygens in each SO4 and 3 SO4s in the formula unit. multiply to get the answer.2) For covalent molecules, you need to specify the number of atoms. An example of a covalent compound correctly named is the second molecule you give, nitrogen monoxide. Wrong examples for this are nitrogen oxide, or mono-nitrogen monoxide (due to arcane rules you only use mono for oxygen) (see source 1 under naming covalent compounds). The next one is an ionic compound so prefixes are not necessary (because we can figure out the number of each atom based on the oxidation state given, which is necessary for atoms with more than one oxidation state). Finally the last one is the correct naming of an acid; the rules just have to be memorized for acids. Carbon Chloride is not valid, because carbon (usually) makes only covalent bonds and the correct way to name it would be carbon tetrachloride.3)Remember, the who molecule by itself must be neutral so if we have an negative 2 charge for every Y ion, we have a -4 from the two Y’s; since we have only one X, it has to make up for this by itself. I’ll let you do the math (total charge should be zero).4)This is kind of like the above two problems put together. We know each fluorine has -1 charge (look at the periodic table) and if we have two fluorines we have a total of -2 charge. To make up for this we need an ion with a +2 charge, so the tin has to have a charge (also called oxidation state) of +2, this is represented by a roman numeral for two II.5) This looks like a repeat of 4.6) each calcium has a +2 charge (from periodic table) and each nitrate has a -1 charge (you have to memorize this or look it up; or understand valence bonding theory very well!). How can you put those two together to have a neutral charge. Obviously, you need two nitrates a one calcium (see answer for seven if this isn’t obvious). Hint each nitrate is NO37) nitride has a charge of -3 (wiki). Iron has a charge of +2 (according to the question). Here’s a way to work out these problems you have Fe (2+) and N(3-). Write them next to each other like I have written. Now the number of Fe atoms is the charge on N and the number of N atoms is the charge of Fe. This is also a way to do the problem above. So you get Fe3N2 (note after this step you have to divide both numbers by the GCF, but the GCF of 2 and 3 is 1).8) This is a question that seems like it has an easy answer but there is debate to exactly what is ionic bonding. For elementary chemistry, subtract the electronegativities of the two atoms (found on Wikipedia or a per. table) and if the difference greater than 1, its electronegative and if the difference is less than one, it’s covalent. CaO is ionic. 9) This is a bit of memorization hypochlorous is ClO, chlorous is ClO2, chloric is ClO3; this naming works for some atoms with oxygen that are different from chlorine (like iodine, bromine). hydrochloric is just HCL.10) You have to have more than two types of atoms for both types of bonding; if they were only two types of atoms you can only have one type of bonding between them (not really a chemistry concept just a math concept called symmetry that’s actually pretty intuitive). Only one of the above has more than two types of atoms.Hope this helps (and increases your interest in chemistry)!

  2. safari says:

    stop being lazy and do it YOURSELF. don’t rely on other people to do YOUR work. its YOUR work. YOUR not going to learn anything if you get other people to do YOUR work.

  3. overchoke says:

    Question 1= 12 atoms, of courseQuestion 2= Carbon chloride, since there’s no “carbonidric acid” to form itQuestion 3= +4Question 4= Tin FluorideQuestion 5= the same as previousQuestion 6= Ca(NO3)2Question 7= Fe2NQuestion 8= CaO (since it’s a metal bonding with a non metal)Question 9= Chlorous AcidQuestion 10= KOHIf I mistook on anything, I should lose my title of Chemistry Geek :)