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dexar [7]
3 years ago
8

OMG PLS HELP ASAP!! It’s my FINAL and I need help. PLS!!

Chemistry
1 answer:
Bas_tet [7]3 years ago
3 0

Answer:

I can answer 26 and 27.

26:

Lighter igneous rocks are more granatic meaning they contain more silica.

Darker igneous rocks are more basaltic meaning they contain more iron and magnesium.

27:

A rock full of holes is likely an igneous rock which formed with many gas pockets inside.

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In an oxidation-reduction reaction, 0.0450 mol of aqueous FeSO4 (source of Fe2+) reacts completely with 120.0 mL of an acidified
igor_vitrenko [27]

Answer:

0.075 M

Explanation:

5Fe²⁺(aq) + MnO₄⁻(aq) + 8H⁺(aq) → 5Fe³⁺(aq) + Mn²⁺(aq) + 4H₂O(ℓ)

Using the moles of Fe²⁺ that reacted, we can <em>calculate the reacting moles of MnO₄⁻</em>:

0.0450 mol Fe⁺² * \frac{1molMnO_{4}^{-}}{5molFe^{+2}} = 0.0090 mol MnO₄⁻

Now we divide the moles of MnO₄⁻ by the volume in order to <u>calculate the molarity of the solution</u>, keeping in mind that 120.0 mL = 0.120 L.

0.0090 mol MnO₄⁻ / 0.120 L = 0.075 M

7 0
4 years ago
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A double-displacement reaction occurs when the negative ion of me compound replaces the positive ion of the other compound to fo
Lapatulllka [165]

Answer: B. False

Explanation: A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

Example:

2NaOH(aq)+(NH_4)_2SO_4(aq)\rightarrow 2NH_4OH(aq)+Na_2SO_4(aq)

Thus as we can see sodium ion Na^+ is being replaced by ammonium ions  NH_4^+ and thus positive ions replace positive ions only and not negative ions.

6 0
4 years ago
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Moseley made revisions to the periodic table that resolved some of the problems with Mendeleev’s version. Which of these was a r
sveticcg [70]
Thanks to Moseley's revision, the importance of the atomic number was acknowledged and it explained why some elements seemed to be out of their place, even though they were actually not.
3 0
3 years ago
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Consider the equations below.
kow [346]

Answer:

Arrow A:  

✔ 74.6 kJ

Arrow B:  

✔ exothermic

Arrow C:  

✔ has a magnitude that is less than that of B

Arrow D:  

✔ represents the overall enthalpy of reaction

Explanation:

8 0
3 years ago
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Pls help it’s 8th grade science
maks197457 [2]

Answer:

The Orange Man is moving quicker.

Explanation:

Energy is compounding which means that the orange man is going 1 m/s + 0.5 m/s or 1.5 m/s and the purple man is going 1 m/s - 0.5 m/s or 0.5 m/s

6 0
3 years ago
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