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AveGali [126]
3 years ago
7

Which phrase best describes how scientists use the data they collect

Chemistry
2 answers:
Neko [114]3 years ago
8 0
Your answer would A. Scientists use their data to show the results and that is the best phrase to describe it. Hope this helps sorry if it didn’t
lozanna [386]3 years ago
7 0

Answer:

The correct answer is b

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Balance this equation-<br> Fe + O2 Fe3 O4
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3Fe + 2O2 —- Fe3 + O4
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I would like to help if tell me what grade this is.

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Which response includes all the following processes that are accompanied by an increase in entropy? 1) 2SO 2(g) + O 2(g) → SO 3(
Mashutka [201]

Answer: Reaction (1) , (3) and (4) are accompanied by an increase in entropy.

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from  an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

(1) 2SO_2(g)+O_2(g)\rightarrow SO_3(g)

3 moles of reactant are changing to 1 mole of product , thus the randomness is increasing. Thus the entropy also increases.

2) H_2O(l)\rightarrow H_2O(s)

1 mole of Liquid reactant is changing to 1 mole of solid product , thus the randomness is decreasing. Thus the entropy also decreases.

3) Br_2(l)\rightarrow Br_2(g)

1 mole of Liquid reactant is changing to 1 mole of gaseous product , thus the randomness is increasing. Thus the entropy also increases.

4)  H_2O_2(l)\rightarrow H_2O(l)+\frac{1}{2}O_2(g)

1 mole of Liquid reactant is changing to half mole of gaseous product and 1 mole of liquid product, thus the randomness is increasing. Thus the entropy also increases.

4 0
3 years ago
Sue has to find the empirical formula of a compound containing 81.8 grams of carbon and 18.2 grams of hydrogen in 100 grams of c
ArbitrLikvidat [17]
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6 0
3 years ago
Balance the following chemical equation
ratelena [41]

Answer:

Explanation:

4). Ca(NO₃)₂ + Na₂SO₄ → CaSO₄ + 2Na(NO₃)₂

  This question is incorrect.

  Since, the final product by reacting Na⁺⁺ and NO₃⁻⁻ is NaNO₃

  Correct equation will be,

  Ca(NO₃)₂ + Na₂SO₄ → CaSO₄ + 2NaNO₃

  This equation is in the balanced form.

5). Ni(NO₃)₂ + KI → NiI + 2K(NO₃)₂

  Correct equation will be,

  Ni(NO₃)₂ + KI → NiI₂ + 2KNO₃

  [Since final product by reacting Ni⁺⁺ and I⁻ is NiI₂]

  Balanced form of this equation will be,

  Ni(NO₃)₂ + 2KI → NiI₂ + 2KNO₃

6). Ni(NO₃)₂ + KOH → NiOH + K(NO₃)₂

   Correct form of the equation will be

   Ni(NO₃)₂ + KOH → Ni(OH)₂ + KNO₃

   [Since reaction of Ni⁺⁺ and OH⁻ gives Ni(OH)₂ and the reaction of K⁺ and NO₃⁻ gives KNO₃]

   Now balancing this equation,

   Ni(NO₃)₂ + KOH → Ni(OH)₂ + 2KNO₃

                              ↓

  Ni(NO₃)₂ + 2KOH → Ni(OH)₂ + 2KNO₃

8 0
4 years ago
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