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Chemistry Test 3
Chapters 9-12 ; Labs 5,6
| Question | Answer |
|---|---|
| 1.The combined mass of the products is always exactly the same as the combined mass of the reactants. | true |
| 2.The amount of energy contained in the reactant molecules is the same as the amount of energy contained in the products of a chemical reaction. | false |
| 3.A reaction equation can have different numbers of atoms on the left and right sides of the equation and still be correct. | false |
| 4.(To form a compound;left side atoms):one atom of a group 1A element | (right side atoms):one atom of a group 7A element |
| 5.(To form a compound;left side atoms):two atoms of a group 1A element | (right side atoms):one atom of a group 6A element |
| 6.(To form a compound;left side atoms):three atom of a group 1A element | (right side atoms):one atom of a group 5A element |
| 7.(To form a compound;left side atoms):one atom of a group 2A element | (right side atoms):one atom of a group 6A element |
| 8.(To form a compound;left side atoms):two atoms of a group 2A element | (right side atoms):one atom of a group 4A element |
| 9.(To form a compound;left side atoms):one atom of a group 3A element | (right side atoms):one atom of a group 5A element |
| 10.(To form a compound;left side atoms):one atom of a group 4A element | (right side atoms):one atom of a group 4A element |
| 11.One water molecule (H2O) consists of: | two hydrogen atoms and one oxygen atom |
| 12. If the atomic weight of hydrogen is 1 AMU and the atomic weight of carbon is 12 AMU,then the molecular weight of methan(CH4)is: | 16 AMU |
| 13.NaOH + HCl ---> NaCl + H2O is: | proper, balanced reaction equation |
| 14. Which is the proper way to complete the following reaction: CaCl2 + Li2O ----> | CaCl2 + Li2O ----> CaO+2LiCl |
| 15. Sulfate (SO4 2–) is a polyatomic ion with a 2– charge. Ammonium (NH4+) is a polyatomicion with a 1 + charge. Which is the proper way to complete the following reaction: MgSO4 + NH4Cl ----> | MgSO4 + 2 NH4Cl ----> MgCl2 + (NH4)2SO4 |
| 16. Atoms that stay together in charged (ionic) groups that act as though they were a single element are called: | polyatomic ions |
| 17.The AMU of CaO is: | CA 40 + O 16 = 56 AMU |
| 18.The AMU of LiCl is: | Li 7 + 35 = 42 AMU |
| 19.The AMU of H2O is: | H 1 +H 1 + O 16 = 18 AMU |
| 20.CH4+2O2+2H2O | Combustion Reaction |
| 21.H+F--->HF | Formation Reaction |
| 22.CaS + MgCl2--->CaCl2 + MgS | Double Displacement Reaction |
| 23.A hydrocarbon, such as paraffin in a candle, requires the element ________________ to complete a combustion reaction. | Nitrogen |
| 24.What compound did the vinegar and baking soda produce which kept the candle extinguished? | Sodium Acetate in Water (H2O Water*) |
| 25.Why did the water enter the glass as the candle flame extinguished? | The combustion reactant(gas left)was extinguished by the water. (Gas atoms left & (water) atoms went in. |
| 26. Extra Credit: The AMU of (NH4)2SO4 is _________AMU. | 132 AMU : Explain- Add up the atomic mass (from the periodic table) for each element in the compound, so you add 2 nitrogen(14 each) + 8 hydrogen(1 each) + 1 sulfur(32 each) + 4 oxygen(16 each) = 132 amu. |
| CHEMISTRY TEST 3 STUDY GUIDE | MSC 09/08 |
| CHEMISTRY TEST 2 STUDY GUIDE | MSC 09/08 |
| CHEMISTRY TEST 1 STUDY GUIDE | MSC 08/08 |
| CHEMISTRY TEST 4 STUDY Guide | MSC 10/08 |
Created by:
jeni25
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