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mezya [45]
3 years ago
10

Use the graph to answer the following questions. Which state has the highest level of air pollution particles for the year 2014?

Which state shows the least change in air pollution particles from 2006 to 2015? What action is most likely to have helped reduce the rate of air pollution particles?
Chemistry
2 answers:
Mice21 [21]3 years ago
7 0

Answer:

Maryland, Wyoming, reduced burning of fossil fuels

Explanation:

edgeunity

Vikki [24]3 years ago
6 0

Answer: Maryland, Wyoming, reduced burning of fossil fuels

Explanation: I took the test and got it right.

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Which model is based on Bohr's quantum model?
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Answer:

Model D

Explanation:

Bohr's Model has a planetary look. Where the electrons are in an orbit.

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A student wants to heat a piece of iron so that its temperature rises by 20 degrees C. What information does she need about the
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Mass................
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Write the balanced chemical equation for the following reaction. Phases are optional. Solid calcium chlorate decomposes to form
Tanya [424]

Answer:

  • Ca(ClO₃)₂ (s) → CaCl₂ (s) + 3O₂ (g)

Explanation:

1)<u> Word equation (given)</u>

  • <em>calcium chlorate (solid) → solid calcium chloride (solid)  + oxygen (gas)</em>

2) <u>Chemical formulae of the reactant and products</u>:

  • <em><u>Calcium chlorate</u></em><em>: </em>

The most common oxidation states of chlorine are -1, +1, +3, +5, +7.

The suffix ate in chlorate means that chlorine atom is with the third lowest oxidation state (counting only the positive states). So, this is +5.

The oxidation state of calcium is +2.

Hence, the chemical formula of calcium chlorate is Ca(ClO₃)₂

  • <u><em>Calcium chloride</em></u>

The suffix ide in chloride means that chlorine is with oxidation state -1. Again the oxidation state of calcium is +2.

Hence, the chemical formula of calcium chloride is CaCl₂

  • <u><em>Oxygen</em></u>

Oxygen gas is a diatomic molecule, so its chemical formula is O₂.

  • <u><em>Phases</em></u>

The symbols s and g (in parenthesis) indicate the solid and gas phases respectively.

3) <u>Chemical equation</u>:

  • Ca(ClO₃)₂ (s) → CaCl₂ (s) + O₂ (g)

That equation is not balanced becasue the number of O atoms in the reactant side and in the product side are different.

4)<u> Balanced chemical equation:</u>

Add a 3 as coefficient in front of O₂(g), in the product side to balance:

  • Ca(ClO₃)₂ (s) → CaCl₂ (s) + 3O₂ (g)

Verify that all the atoms are balanced:

Atom    Reactant side      Product side

Ca             1                           1

Cl              2                          2

O              3×2 = 6                2×3 = 6

Conclusion: the equation is balanced and the final answer is:

  • Ca(ClO₃)₂ (s) → CaCl₂ (s) + 3O₂ (g)
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Which of the following correctly describes the role of scientific models in the advancement of technology? Models represent the
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Models help us better understand the phenomena
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Atomic number is the term you are looking for
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