Balancing Chemical Equations Quiz Balance the following chemical equations AND state which type of reaction. 1. Fe + O2  Fe3O4
2. Sr + O2  SrO
3. Sn + NaOH  Na2SnO2 + H2
4. K + Br2  KBr
5. C8H18 + O2  CO2 + H2O
6. Sb + I2  SbI3
7. COCl2 + H2O  HCl + CO2
8. CS2 + O2  CO2 + SO2
9. H2SO4 + NaCN  HCN + Na2SO4
10. KClO3  KCl + O2
11. H2 + F2  HF
12. BaCl2 + KIO3  Ba(IO3)2 + KCl
13. Mg + HCl  MgCl2 + H2
14. What does the law of conservation of matter state?
15. How does balancing equations demonstrate the law of conservation of matter?
16. How many grams of sodium would react with 20 grams of chlorine to produce 31.5 g of sodium chloride?

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Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

Oxidation-reduction reactions (often called "redox" for short) are reactions that involve the transfer of electrons from one species to another. oxidation states, or oxidation numbers, allow chemists to keep track of these electron transfers. in general, one element will lose electrons (oxidation), with the result that it will increase in oxidation number, and another element will gain electrons (reduction), thereby decreasing in oxidation number. the species that is oxidized is called the reducing agent or reductant. the species that is reduced is called the oxidizing agent or oxidant. to sum up: oxidation = increase in oxidation state = loss of electrons = reducing agent reduction = decrease in oxidation state = gain of electrons = oxidizing agent part a which element is oxidized in this reaction? fe2o3+3co→2fe+3co2 enter the elemental symbol. view available hint(s) is oxidized part b which element is reduced in this reaction? 2hcl+2kmno4+3h2c2o4→6co2+2mno2+2kcl +4h2o enter the elemental symbol. view available hint(s) is reduced