Science

1) Which of the following is true about photosynthesis?
A. It is an exothermic reaction
B.It is a endothermic reaction *****
C.It produces carbon dioxide
D. It occurs in animals

2) Atomic Theory is
A.Subject to change if new information is discovered
B.A solution to the problem of differing isotopes
C.Unchangeable *******
D.A descriptive table that lists all of the elements

3) Two nonmetals from Group 16 are likely to form a
A.triple and iconic bond
B.double and iconic
C.triple and covalent bond
D.double and covalent bond
For 3 i think it is covalent I just don't know if it is triple or double. Can someone please check these answers??

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  1. Hi :3 the answers are
    B
    A
    C
    I sure hope this helps! :D <3

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  2. The answers are:
    1.)B
    2.)A
    3.)D
    4.)C
    5.)D
    6.)A
    7.)C
    8.)B
    9.)D
    10.)C
    11.)C
    12.)C
    13.)A
    14.)B
    15.)C

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  3. Number 9 is actually is C

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  4. oh yah sorry it is c. I meant c

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  5. No it's actually D, I took the test and it said I got it wrong and I had chosen C.

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  6. 9 is actually c. trust me

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  7. I just took test and it is d not c. I trusted theabove post, put c and got it wrong. It's d

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  8. Yeah, 9 is C

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  9. NINE IS D ITS NOT C TRUST ME I TOOK THE PRACTICE AND GOT 100% PROMISE

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  10. It's D guys. For all online students

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  11. 9 is C I swear to god

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  12. So Maddie is all right except 9 I chose D and I got 14/15. So 9 is C. If you go to connexus academy

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  13. 9 is D for kids in connexus. I tried C and got a 93.3%. I am not trying to make you get it wrong I promise. D is right, C is wrong.

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  14. Its C i swear! I just hit submit and got 14/15! It's C!!!!

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  15. Maddie is right the first time it is d not c that is if you are in OCA if not then have fun trying to get it but OCA kids IT IS D NOT C -_- =)

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  16. lol guys i dont know why everyone is so worked up about 1 question on a PRACTICE TEST even if u get 0/15 IT WILL NOT AFFECT YOUR GRADE ANY PRACTICE TEST DOES NOT AFFECT YOUR TEST BUT IF U REALLY CARE I PUT D AND I GOT IT CORRECT OK JUST CHIIIIILLLLLLLLL

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  17. Thank you Amaya that was just ridiculous

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  18. Guys it’s D for heavens sack

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  19. the only one wrong is 5 its actually c, but everything else is right

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  20. 9 is 11g seriously do the math

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  21. 9 goes A:1.0 B:8.0 C:9.0 D:11.0 E:20.0
    D:11.0 is correct

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  22. Maddie is 100% correct, I just took the practice test and got them all right!

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  23. 1. B
    2. A
    3. D
    4. C
    5. D
    6. A
    7. C
    8. B
    9. its flippin C ok?
    10. C
    11. C
    12. C
    13. A
    14. B
    15. C
    9 is c I JUST took the practice test and its c ok? just trust me and for others who say its d idk what test your taking but it aint this one.

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  24. Number 9 is A to E, some of you people picked D cause you thought it was C... Number 9 is C

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  25. Whoops, D, My bad.

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  26. And some of you picked the correct answer cause you knew Number 9 was A through E

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  27. It wasn’t c for me, but thank you for the other answers they were right!

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  28. I dont understand half of you that tey to confuse or put wrong answers to mess others up. Treat people how u want to be treated. Meh's answers are correct except for number 9. C IS NOT CORRECT IT IS NOT 9.0 g. Id try 11.g but its not 9.. btw im not a teenager.. im a mom helping my son so i have no reason to lie like some of u immature kids on here. Grow up and help others. Your not their parent to be telling them they need to do it their self.

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  29. I am serious for my life! I got 15/15 when i put D. 11.0! i don't know if it is different for you guys or you guys are just getting mixed up because they have an E answer choice. I don't know but I am serious, it is D! Promise forever! Please listen! I would never get anybody wrong because if you lived with me, you would obviously know I am a goody-two-shoes. Also, I am only on here because I am trying to help all of those students that are having trouble in this horrid school so whoever is not in Connections Academy best never enroll into the school because it is the worst. I am lucky this is my last year there.

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  30. THE ANSWER CAN BE BOTH IS SWITCHES THE ANSWER TO 9 IS 11.0 G!

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  31. number 9 is d i took the test answered number 9 as c and got it wrong

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  32. Its D for sum ppl practice and Its C for others...for me it was D!

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  33. 9 is D on the practice text for 8th graders in connections

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  34. 9 is d. I know because i accidentally picked e. If you want me to be specific. It says: (1 pt) 11.0g. So it is d. I went with the original answers. All correct.

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  35. For number 9 it actually is d. There are 5 options a, b, c, d, and e. If you don’t pay attention and accidentally put e it is wrong. So all you guys have to do is pay more attention to what the choices are. The answer if you guys are wondering is 11.0 g. U guys welcome

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  36. If you guys were to put the question to number 9 that you are debating over, it might help, maybe you all are talking of two different questions? You may all be right, for one question it may be D, and for the other, C.
    Have a good day :)

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  37. What would also help is if you were to write the choices out like "Waffles" did.

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  38. Meh is right 100% thx

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  39. It is D I just pressed C and got 14/15

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  40. Guys listen, 9 is D. 11.0g. I think its pretty immature that some people are trying to make others get the questions wrong. Grow up. You are in 7th grade. Its ridiculous.

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  41. 9 is C

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  42. there is 4 choices for #9 and it is D

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  43. Chemical Reactions Practice
    Responses saved. The final score is 15/15 (100%).

    Multiple Choice
    1. Which of the following is true about photosynthesis? (1 point)
    (0 pts) It is an exothermic reaction. (1 pt) It is an endothermic reaction. (0 pts) It produces carbon dioxide. (0 pts) It occurs in animals.
    1 /1 point
    2. Atomic theory is (1 point)
    (1 pt) subject to change if new information is discovered. (0 pts) a solution to the problem of diering isotopes. (0 pts) unchangeable. (0 pts) a descriptive table that lists all of the elements.
    1 /1 point
    3. Two nonmetals from Group 16 are likely to form a (1 point)
    (0 pts) triple and ionic bond. (0 pts) double and ionic bond. (0 pts) triple and covalent bond. (1 pt) double and covalent bond.
    1 /1 point
    Use your reference copy of the Periodic Table to answer questions 4 and 5.
    4. How can you describe the location of magnesium (Mg, atomic number 12) on the periodic table? (1 point)
    (0 pts) nonmetal (0 pts) metalloid (1 pt) Group 2, Period 3 (0 pts) Group 3, Period 2
    1 /1 point
    2/5/2019 Chemical Reactions Practice
    5. How many valence electrons does magnesium (Mg) have? (1 point)
    (0 pts) 12 (0 pts) six (0 pts) three (1 pt) two
    1 /1 point
    6. Which reaction is exothermic? (1 point)
    (1 pt) cellular respiration (0 pts) photosynthesis (0 pts) baking soda + vinegar (0 pts) melting ice
    1 /1 point
    7. You are creating a carbon cycle poster. What could you include in the poster to demonstrate the cycling of carbon?
    (1 point)
    (0 pts) a rock falling (0 pts) shells fossilizing (1 pt) an eagle breathing (0 pts) the sun shining
    1 /1 point
    8. Which chemical equation is balanced? (1 point)
    (0 pts) H20 H2 + 2O2 (1 pt) 2H20 2H2 + O2 (0 pts) 2H2O H2 + 2O2 (0 pts) H20 2H2 + 2O2
    1 /1 point
    9. A student mixed two clear liquids together in a beaker. A solid and a new liquid formed. The student forgot to write down the mass of one of the reactants. The rest of the data are shown in the table below.

    Mass (g) liquid reactant A unknown liquid reactant B 9.0 liquid product 8.0 solid product 12.0


    What is the mass of liquid reactant A?
    (1 point)
    (0 pts) 1.0 g (0 pts) 8.0 g (0 pts) 9.0 g (1 pt) 11.0 g (0 pts) 20.0 g
    1 /1 point
    10. Tony’s teacher gave him an unknown substance to identify based on its properties. Aer a few tests, Tony listed his observations in a chart.
    solid at room temperature
    brittle
    conducts electricity
    What kind of substance does Tony have?
    (1 point)
    (0 pts) nonmetal (0 pts) metal (1 pt) metalloid (0 pts) noble gas
    1 /1 point
    11. When two hydrogen atoms bond with one oxygen atom to form water, what happens to the electrons? (1 point)
    (0 pts) Each hydrogen atom donates its electron to the oxygen atom (0 pts) The oxygen atom donates an electron to each hydrogen atom (1 pt) A pair of electrons is shared at each of the hydrogen-oxygen bonds (0 pts) No electrons shared or donated
    1 /1 point
    12. Why is frying an egg an example of a chemical change? (1 point)
    (0 pts) atoms are lost during the reaction as bonds are broken (0 pts) atoms are gained during the reaction as new bonds form (1 pt) the products have dierent properties than the reactants (0 pts) the properties of the reactants are seen in the products
    1 /1 point
    2/5/2019 Chemical Reactions Practice
    13. How did the discovery of the electron change the atomic model? (1 point)
    (1 pt) It disproved the earlier idea of an indivisible atom. (0 pts) It confirmed that atoms are very tiny. (0 pts) It exposed fraudulent experiments conducted by unqualified scientists. (0 pts) It proved that atoms are easier to see than once believed.
    1 /1 point
    14. A student analyzed two diagrams of a nitrogen atom. Both diagrams showed seven protons in the nucleus, but the number of neutrons diered.

    What are the two nitrogen atoms?
    (1 point)
    (0 pts) electrons (1 pt) isotopes (0 pts) covalent bonds (0 pts) ionic bonds
    1 /1 point
    15. What is an arrangement of all elements showing the repeating pattern of their properties? (1 point)
    (0 pts) atomic model (0 pts) electron dot diagram (1 pt) periodic table (0 pts) chemical formula
    1 /1 point

    The final score is 15/15 (100%)

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  44. Flip 9 is c now I got 14/15 and this is a Christian website.

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  45. 9 is D

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  46. Mr. Flitcher is right

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  47. 9 IS D....I REPEAT 9 IS D!!!!!! I JUST TOOK THE PRACTICE AND I GOT 100% BECAUSE I PUT D ON NUMBER 9 NOW STOP FIGHTING!!!!! have fun y'all ;^ ;)

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  48. it's different for everyone depending on what kind of test you're taking but I'm just gonna leave the little detail that when I took it and put "D" as the answer, I got it correct so it might work in most cases and even if it doesn't, it' just a practice and it's just one other thing to study before the actual test :/

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  49. I used D and I got 15/15, But the answers are a-e so those not paying attention might think D is C. The answer is 11.0 so which ever says 11.0 for you thats the answer. But for me it was D.

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  50. 9 has 5 options it is the 4th one

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  51. I don't write because I'm lazy but here's for all you lazy out their
    1.B
    2.A
    3.D
    4.C
    5.D
    6.A
    7.C
    8.B
    9.D
    10.C
    11.C
    12.C
    13.A
    14.B
    15.C
    2019 CHEMICAL REACTION UNIT REVEIW science 8 B unit 1 : chemical reaction LESSON 8

    Their you go you heathens!

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  52. yup nine is D i come here to check my work and guys i thought i had some wrong so i changed them and well ur wrong its D for number nine ok stop the fighting and the cheating because sometimes people are wrong u know.😭 😭😭 😭 😭 😭 😭

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  53. Hey everyone it's D the question is A- E so there are 5 possible answers. C is 9.0 and D is 11.0, 11.0 is the correct answer

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  54. It is c for number 9, but it isn't the end of the world! It doesn't even count for grade lol ;)
    😂

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  55. Hoi! Me TeM is right it is C and also it isn't the end of the world it is just a practice to see if you know it it isn't against your grade

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  56. I got a 14/15 using D and im not freaking out but yall belive what you want

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  57. Maybe it’s different depending on the state because I just did it using D for number 9 and it worked I got a perfect score.

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  58. 9 is d

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  59. Maybe u could use your head and 11.0g is the correct answer so they prob randomize the answers so whichever one is 11.0g that is right

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  60. 9 is D IF you are a CONNEXUS STUDENT or IF you are NOT a CONNEXUS STUDENT then it is PROBABLY another answer.
    Also I just took the test and MADDIE is correct. Thank you Maddie

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  61. 9 is D

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  62. It's D ok stop arguing I just toke the test and got 15/15

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  63. Number nine:

    If you combine the two new products' mass, you get 20 Grams, because
    8g+12g=20g

    This means the two reactants have to be combined to have a mass of 20g.

    9g + 11.0g=20g

    The correct answer is 11.0g, of which is D.

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  64. Guys i just took the practice test the answer is D!!!!!!!!!

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  65. Okay so it is actually 11.0g they switch the answers up sometimes.

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  66. Maddie! thank you for your post: #9 IS C!
    I got 15/15 because of you!
    :)

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  67. I am also above, and i like how everyone is fighting about 1 question ;^

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  68. ok so fro conexxous in 2019 it is c on number 9

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  69. 9 is c you i would say go back to school but thats what youre struggling with so i guess it makes sense.and it is a practice why would you complain over one answer any ways when it doesnt affect your overall grade

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  70. 9 is 11g

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  71. 9. is Actually C. for connexus students and 3. is B. so for all the people that were arguing the people that said C. are correct and I never know who to listen to because kids lie and make other kids get bad grade so these are the only ones wrong with maddies answers

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  72. Maddie is 100 percent correct

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  73. Nine is C I got a 93.3 percent. I swear it’s C DO NOT PUT D

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  74. This has gone on for 3 years its time to stop

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  75. Y’all having a whole war abt one question-

    For 9 it’s 11.0 which is D on my test. It may be C for you but it’s D for me.

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  76. kiribaku is canon.

    1. B
    2. A
    3. D
    4. C
    5. D
    6. A
    7. C
    8. B
    9. D
    10. C
    11. C
    12. C
    13. A
    14. B
    15. C

    anyways have a good day everyone-

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  77. 1. B
    2. A
    3. D
    4. C
    5. D
    6. A
    7. C
    8. B
    9. D
    10. C
    11. C
    12. C
    13. A
    14. B
    15. C
    I agree with "dont care" and " Jesus Christ....".On question 9 the answer is 11.0 which is D if it is C on your test then put C don't keep arguing over one question at least your still passing.

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  78. @Myheroacademia Bakudeku. And can we all agree that david from camp camp is so CUTE WITH DANIEL DANVID FOR LIFE!

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  79. Okay, if you are wondering the answer is 11.0g, if you did what I did you didn’t see that there was a 5th option and thought that there was only four options, the answer choices are from a to e and d is the right one, so please stop being so rude to each other 😊

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  80. *from a to e

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  81. 9 is d fosor

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  82. Thx Maddie. P.s whoever says that 9 is c they are trolls

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  83. yep 9 is D

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  84. Y'all are ballistic and it's hilarious.

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  85. ik no ones made it down here but 9 is c for the practice at least for me so ya i normally post my gmail so u can talk to me on hangouts but ugh im to lazy

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  86. lol by mistake i chose E cuz i thought there were only 4 options.
    The correct one for 9 is D

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  87. I tried D it was wrong it is C

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  88. Now I think the letter changes per different state or year, but here in Arizona 9 is D 11.0 grams that is correct, in other states it might be C, but in every state and every year, just choose the letter that has 11.0 grams next to it, I hope this clears up any confusion on the matter, is that okay for everyone?

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  89. its c no cap

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  90. For the practice I got 14 of 15 number 9 is c if you go to connexus

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  91. Hi I am a person who will not tolerate liars. The answer is 11.0g. I don't care if it is D or C. If you are on #9 and see 11.0g then that is your correct answer. OKAY. And if you want to contradict that well you can't because IT IS 11.0g WHETHER IT IS D OR C!

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  92. Maddie is right as of today

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  93. I just took the practice and put D for online students. (:

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  94. GUYS IF YOUR STILL AGRUING IF ITS C OR D STOP>
    <READ THIS>
    This is ubserd! no its c no its d no its c no its d no its c no its d no its c no its d Just pls stop. For once pls put your answer. pls coose your answer im asking you to do its for 1 question. Belve me arguaryign is not an option i will just make it worse. Also this is only 3 min read

    Most American students start every day of their lives the same way for a decade.
    They rise, put their hand over their heart, and pledge allegiance to their country.
    It’s a powerful ritual that ingrains a sense of loyalty to their country which lasts a lifetime.
    But the ritual of a daily pledge doesn’t have to be limited to children or solely used to fuel patriotism.
    As adults, we can pledge to support ourselves as easily as we pledged to support our country as children.
    Just like the pledge of allegiance to America helps cement its ideals in our brains, so too can our own personal pledge help us become who we want to be.
    So please rise, put your hand over your heart, and recite after me…
    I pledge allegiance to myself.
    I pledge to move toward my fear and not run from it.
    The things that scare me, push me out of my comfort zone, and feature an uncertain fate, are those which will help me grow.
    They’re what I most want and need.
    Today I won’t run from my fears. I won’t hide. I’ll attack them and know even if I fail, I’ll be better for doing so.
    Because that failure will make me less afraid and move me one step closer to success.
    I pledge to act like the person I want to become and not just the person I’ve been.
    My past will not define my future.
    My bad habits, the stories I tell myself, and the ingrained beliefs I carry about who I am and what I’m capable of are not set in stone.
    They’re only part of my life’s narrative. Chapters of a book still being written. And today’s chapter will be a turning point.
    If I want to be a strong person, I can be. If I want to take risks, I can. If I want to live a different life, I will.
    Today I’ll live as the person I can be and not just the person I’ve been.
    I pledge to do something today I’ve never done before.
    I have a 24-hour opportunity to find or create an experience unlike any I’ve had before.
    It doesn’t have to be huge, doesn’t have to be life-changing, and doesn’t even have to take more than one of the 1,4440 minutes I have to do it. But it has to happen.
    I will find a way to experience something new in life today because doing so will pay dividends.
    It will teach me a new lesson, give me a new memory, or open my eyes to a new possibility.
    Today is an incredible opportunity and I won’t waste it.
    I pledge to accomplish the single most important thing I have to do today.
    There’s always one thing.
    One thing more important than the others on my to-do list.
    One thing which will move the needle most.
    One thing that will get me closer to what I want or who I want to become.
    Maybe it’s for work, maybe it’s for someone I love, maybe it’s for myself. Whatever it is, I will do it— even if it’s the only thing I get done today.
    I won’t get distracted, won’t gift my attention to whoever pulls at it the loudest, and won’t drown in a sea of responsibilities.
    I can and will do many things today, but not at the expense of the most important one.
    I pledge allegiance to myself.

    this was all said by one man. Josh Spector on Apr 27,2018

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  95. Actually 4 was wrong..... 11.0 g is right for 9 but 4 is c

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  96. Maddie❤ is right its d I got a 13/15 but I'm giving the right 💯💯answers

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  97. number 9 is 1000000% D

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  98. everybody !!! i took the practice for connexus. all are right for meh but 9. it is d, 11.0grams. TRUST ME!!!

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  99. 9 is d

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  100. Listen, if you didn't know this... practices do NOT affect your grade.
    It is a PRACTICE. There is no need to get worked up about question 9.
    I will take the practice and tell you what I got for number 9...
    but Siriously... no need to get aggravated about this.

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  101. Ok... I have taken the practice and for question 9 I chose
    D. 11.0g and I got it correct. So, the answer is D

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  102. It is 11.0g for 9, just chose what ever one that says 11.0g

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  103. 1.8.4 - Practice: Chemical Reactions Practice
    Science 8 B - <teachers name> / 1. Chemical Reactions / 1.8. Chemical Reactions Unit Review

    Answers:

    Correct answer B. It is an endothermic reaction.
    Correct answer A. subject to change if new information is discovered.
    Correct answer D. double and covalent bond.
    Correct answer C. Group 2, Period 3
    Correct answer D. two
    Correct answer A. cellular respiration
    Correct answer C. an eagle breathing
    Correct answer B. 2H20 right arrow 2H2 + O2
    Correct answer D. 11.0 g
    Correct answer C. metalloid
    Correct answer C. A pair of electrons is shared at each of the hydrogen-oxygen bonds
    Correct answer C. the products have different properties than the reactants
    Correct answer A. It disproved the earlier idea of an indivisible atom.
    Correct answer B. isotopes
    Correct answer C. periodic table

    15/15 ( #9 is D for those who don't agree or know )

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  104. If there are any people still out there, well
    9 IS D YOU !

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  105. I don't know if anyone will read this far but for connexus students D is the correct answer for nine

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  106. Nah mane, if yall on connexus then 9 is not C, its D, i chose C and gotta 93.33

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  107. i know that the answer is d because with my very 2 own eyes i took the test i clicked on c andit was wrong so thatnks you guys the answer is d
    ok THE ANSWER IS D I SWER TO WHATEVER GOD IS UP THERE TRUST MEEEE

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  108. It is D. I just took it and it said this
    A student mixed two clear liquids together in a beaker. A solid and a new liquid formed. The student forgot to write down the mass of one of the reactants. The rest of the data are shown in the table below.

    Mass (g)
    liquid reactant A unknown
    liquid reactant B 9.0
    liquid product 8.0
    solid product 12.0

    What is the mass of liquid reactant A?
    Incorrect answer A. 1.0 g
    Incorrect answer B. 8.0 g
    Incorrect answer C. 9.0 g
    Correct answer D. 11.0 g
    Incorrect answer E. 20.0 g

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  109. 1.8.4 - Practice: Chemical Reactions Practice
    Science 8 B - <teachers name> / 1. Chemical Reactions / 1.8. Chemical Reactions Unit Review

    Answers:

    Correct answer B. It is an endothermic reaction.
    Correct answer A. subject to change if new information is discovered.
    Correct answer D. double and covalent bond.
    Correct answer C. Group 2, Period 3
    Correct answer D. two
    Correct answer A. cellular respiration
    Correct answer C. an eagle breathing
    Correct answer B. 2H20 right arrow 2H2 + O2
    Correct answer D. 11.0 g
    Correct answer C. metalloid
    Correct answer C. A pair of electrons is shared at each of the hydrogen-oxygen bonds
    Correct answer C. the products have different properties than the reactants
    Correct answer A. It disproved the earlier idea of an indivisible atom.
    Correct answer B. isotopes
    Correct answer C. periodic table

    15/15 ( #9 is D for those who don't agree or know )

    connexus kid

    Correct 100% as of 3/25/2021

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  110. I go to connexus and for 9 tge a see was d 11.0g

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  111. maddie is right

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  112. Question Summary Question 9 Correct (1/1 point)
    Question 9 of 15
    A student mixed two clear liquids together in a beaker. A solid and a new liquid formed. The student forgot to write down the mass of one of the reactants. The rest of the data are shown in the table below.

    Mass (g)
    liquid reactant A unknown
    liquid reactant B 9.0
    liquid product 8.0
    solid product 12.0

    What is the mass of liquid reactant A?
    Incorrect answer A. 1.0 g
    Incorrect answer B. 8.0 g
    Incorrect answer C. 9.0 g
    Correct answer D. 11.0 g

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  113. Anonymous is correct thank you so much

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  114. Its 11.0 (D) for Pearson Students

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  115. 9 is d lol

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  116. it IS D for pearson students. so stop fighting. There are different platforms yk?

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  117. here is the math you have
    liquid A
    liquid B 9
    liquid product 8
    solid product 12
    in the law in chemical science law of conservation of mass which means nothing is destroyed only stored
    you add liquid product and solid product since they are the result which is 20 then you minus that by the other reactant B which is 11; 20 - 9 = 11 then that means that its 11 so your answer to question #9 OR "A student mixed two clear liquids together in a beaker. A solid and a new liquid formed. The student forgot to write down the mass of one of the reactants. The rest of the data are shown in the table below" is 11.0 Grams if you don't believe me that is fine but i showed you my math and i got the right answer on my test if you didn't i am sorry

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