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

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Q-20
Answer B
Because decomposition is where a compound breaks down to form two or more product.

Q-14
Answer C
Because Element A & Element X had the the most common wavelength line with the mixture.

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First Row:
Q-7
Answer C
I looked at table H, the line matches up with the temperature.

Q-10
Answer A
An ideal attraction involves no obstacles.

Q-11
Answer A

Q-

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21-D because in one mole of C2H6 there are two carbons so to produce 2 moles of C2H6 you would need 4 Carbons or 4 moles.
16-A because there are two less protons then there is neutrons in ion A.
15-B because each line in s spectra shows the energy absorbed as an atom gains an electron
8-C because in CH4 the 4 Hydrogens can be equally distributed to the carbon therefore making it polar.
19-A When referring to Table I you can see that two moles = 66.4 so one mole would equal +33.2.
13-C (i guessed)
24-D as shown by the diagram one element is represented by black while the other element is represented by a white circle. In choice answer D all of the elements are separated therefore showing a mixture.
14-C When matching the lines in elements X and A they match up to the mixture
9-A (i guessed)
4-B Both carbon dioxide and Carbon monoxide have carbon but a different ending therefore having different physical properties.
6-A because it cant be answer choice c or d because it cant be a mixture if the elements are combined so it has to be a substance
25-D As shown in the table Sodium and iodine are different based on malleability.
10-A Gasses go in straight lines in random directions but they do not attract.

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1. (a) Heat flows from hot to cold, since copper is 60 degrees and iron is 20 degrees, heat will flow from the copper to the iron.

4. (c)  Choice C is where it is most stable (low energy, high disorder)

8. (b) Check Table S, to see the melting points of the elements.

10. (d) It is synthesis because 2H2 + O2 combined to make 2H2O and produce energy.

11. (b)  Radii increases when you gain electrons.

13. (c)  q=mCT IS substitute values into equation. (49.5)(4.18)(44) = 9104.04 = 9.1

14 (b) P1V1/T1 = P2V2/T2 is (1atm)(11.2 L) / (273 K) = (2atm)(V2) / (300K) = 6.15 L

16. (d) ZN(s) (LOOK AT TABLE J)

17. Freezing Point of mixture 4 is lower than the freezing point of water.

19. When dynamic equilibrium is reached the reaction at equal rates & the concentration of products and reactions remain constant

20. (c) Electrons are negatively charged and outside the nucleus.

21. (d) Look at the Periodic  Table. Atomic number is equal to the number of protons and when you add up the electrons in the electron shells you get the amount of electrons which should be equal to protons and the atomic number.

25. (d) A-C are metals, so the answer must be D (:

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First Diagonal:

Q-13 / Answer:
- (need help in this one)

Q-2 / Answer: B
- They would both have the same amount of number of atoms if the  volume were the same to each other.

Q-12 /Answer: A
- HI has the lowest electronegativity which is 0.4.

Q-10 / Answer: D
- When you add both the reactants 2H2 + O2  you get the end product which is 2H₂O and the energy.

Q-7 / Answer: C
- The first shell can only hold 2 electrons unlike in the 2nd shell, which can hold 8 electrons and as you can see A,B, and D all had less or 8 electrons in its 2nd shell unlike in C which only had 5 in the 2nd shell and 1 in the 3rd shell which shows that it is in an excited state because it would 2-6 in ground state.

2 nd Diagonal:

Q-14 / Answer: B
- When you use the Combined gas law which is P₁V₁/T₁ = P₂V₂/T2
you get --> (1atm)(11.2L)/(273K)=(2atm)
V₂/(300K)=6.15L

Q-25 / Answer: D
- When you look on the periodic table Si is classified as a metalloid.

Q-12 / Answer: A
- HI has the lowest electronegativity which is 0.4.

Q-16 / Answer: D
-When you look at Table J it shows that Zn is above Ni unlike the other which shows that this metal would spontaneously react with NiCl₂(aq).

Q-3 / Answer: B
- The stronger the hydrogen bonding then the higher the boiling point because it's harder to break down the bonds.

Middle Row:

Q-5 / Answer: C
- LeChatelier's principle say that the system is affects equilibrium when it is stressed.

Q-18
- Increasing the surface area will increase the speed of the reaction

Q-12 / Answer: A
-HI has the lowest electronegativity which is 0.4.

Q-4 / Answer: C
- The systems in nature tend to undergo changes toward higher entropy and lower energy.

Q -19 / Answer:
-When dynamic equilibrium is reached in this system, the concentration of the reactants and products remain constant.

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1) will not reach equilibrium- Reason is because the sample is not in a closed area
2)B- Reason gold foil experiment found out its empty space and positive charged
5) A- Electrons are found in orbitals
7)A- arrangement is based on increasing atomic number
9)A- Ne
12)D- it absorbs in the beginning then is broken as the product
14)A- can’t break down a element by chemical means
22)A- crystal structures makes a difference
23)C- it’s single replacement
24)A- FeO
25)B-2 moles make it balanced

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1.A
8.C
10.A
12.C
13.B
15.B
16.C
17.B
18.D
21.D
24.D
25.D