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Chemistry Test 3

Chapters 9-12 ; Labs 5,6

QuestionAnswer
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