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Answer is A
Reason is because an ideal gas requires lower pressure

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1)D
4)D
5)C
6)RbCl
9)Ne-20 = 10; Ne-22 = 12
10)D
11)B
13)C
14)C
17)A
20)D
21)D
25)B

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1. a- because copper is more denser then iron
2. a- liters and moles are hand and hand in avocado's law
3. a- has to do with molecular size
7. c- because the excited state always has an extra shell

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24.-C because Oxygen has the highest electronegativty?
4-D because you have to add 273 to the celcius to get the kelvin
16-C because they are the same elements different structures but the same properties
21-D because as bonds are broken the energy that the bonds were holding gets released
25-A

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1: (a) Answer is A because iron combines with oxygen to form rust. (B-D are physical changes)

2: (b) Answer is b because they are both the same elements therefore a, c, and d must be the same. B is the only thing that can be different.

3: (d) I- has the most electrons of (54) therefore it has the largest radius

8: (a) when you draw the molecule for CH4. You’ll see that it’s symmetrical, since it’s symmetrical we know that it MUST be nonpolar.

9: (a) Choices B-D would not result in the colors separating

10: (a) Ideal Gas Law states constant random lines in straight motions. This is choice A.

13: (b) This is the choice where it is most stable. There is low energy and high disorder.

15: (d) Energy is lost as you go from the excited state to ground state.

17: (B) Fluorine is more active than Hydrogen, so it would work out. (Check Table J)

18: (d) same temperature, pressure, and volume = same number of molecules

19: (a) When you look at Table I you’ll see that the product 2NO2 has +66.4 kJ. Since we want  NO2 if we divide +66.4 by 2 we get 33.2 kJ.

22: (c) The mass is 42 and the number of protons is 19. 42 - 19 = 23. So the number of neutrons is 23

25: (d) Observe the graph (:

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1-(

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1- (B)Reason is because when finding a mole of a 220. Gram sample of CO2 you will get 5.0 mol.
3-(C)Reason is because using the Combined Gas Law and plugging in Standard Pressure and Standard Temperature, you then solve to find the volume getting 4.29L .
4-(C)Reason when making a equation to find how much heat is needed to change form.
5-(C)Reason entropy is the randomness of a substance. L-G will have more randomness in structure then the other choices.
6-(Kr)Reason when the electron configuration decreases it will go back to Kr which is a noble gas.

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1) (a) because this is the only choice that shows a chemical reaction
2) (b) this is the answer because the formation only changes because of graphite and diamonds come from the same element
9)(A) The answer is A because the chromatography is forcing the other colors out which cause it be only molecular polarity  cause the others dont make sense as the answer
10)(a) the answer choice is A because ideal gases have a straight line motion with no attractive forces i remember this from prior lessons
11) (B) This is the answer because thats the regular boiling point.
13)(C) This is the answer due to the fact when they are in natural change they are stable
14)(c) The answer is C because X and A make up the mixture when put together.
17)(D) The strong attraction between hydrogen and oxygen will have the greats polarity
18)(D) The answer is D because of the same numbers
19)(A) Because when you divide you get a positive cause on table I its still positive
21)(D) Because it will cause the two sides to become equal
22)(C)Because you have to subtract the mass number by the protons

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7) A- the elements on the periodic table of the elements are arranged by atomic number.

5) A-the wave mechanical model of the atom, electrons are located in oribitals.

13) B- electronegativity is the attraction between electrons.

14) A-  Ccan not be broken down anymore than it already is.

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1)(c)
8)(A)
10)(c)
20)(B)
7)(B)

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24) C
4) C
16) A
21) D
25) A

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3.A
4.B
6.A
9.A
10.C
11.C
12.D
13.C
15.D
19.D
20.B
25.A