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3 years ago

8

What are the major characteristics of Florida's three landform regions?(Northern highlands,Central highlands and the coastal low

lands)

1 answer:

tamaranim1 [39]3 years ago

3 0

I know this one its that one

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Which of the following compounds is a molecule?

Ksju [112]

"H2" is the one among compound the following choices given in the question that is a molecule. The correct option among all the options that are given in the question is the third option or the penultimate option. The other options are all salts. I hope that this is the answer that you were looking for and the answer has actually come to your desired help.

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4 years ago

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In which reaction does the oxidation number of hydrogen change? In which reaction does the oxidation number of hydrogen change?

dedylja [7]

<u>Answer:</u> The correct answer is $2Na(s)+2H_2O(l)\rightarrow 2NaOH(aq.)+H_2(g)$

<u>Explanation:</u>

Oxidation number is defined as the number which is given to an atom when it looses or gains electron. When an atom looses electron, it attains a positive oxidation state. When an atom gains electron, it attains a negative oxidation state.

Oxidation state of the atoms in their elemental state is considered as 0. Hydrogen is present as gaseous state.

For the given chemical reactions:

<u>Reaction 1:</u> $2HClO_4(aq.)+CaCO_3(s)\rightarrow Ca(ClO_4)_2(aq.)+H_2O(l)+CO_2 (g)$

Oxidation state of hydrogen on reactant side: +1

Oxidation state of hydrogen on product side: +1

Thus, the oxidation state of hydrogen is not changing.

<u>Reaction 2:</u> $CaO(s)+H_2O(l)\rightarrow Ca(OH)_2(s)$

Oxidation state of hydrogen on reactant side: +1

Oxidation state of hydrogen on product side: +1

Thus, the oxidation state of hydrogen is not changing.

<u>Reaction 3:</u> $HCl(aq.)+NaOH(aq.)\rightarrow NaCl(aq.)+H_2O(l)$

Oxidation state of hydrogen on reactant side: +1

Oxidation state of hydrogen on product side: +1

Thus, the oxidation state of hydrogen is not changing.

<u>Reaction 4:</u> $2Na(s)+2H_2O(l)\rightarrow 2NaOH(aq.)+H_2(g)$

Oxidation state of hydrogen on reactant side: +1

Oxidation state of hydrogen on product side: 0

Thus, the oxidation state of hydrogen is changing.

<u>Reaction 5:</u> $SO_2(g)+H_2O(l)\rightarrow H_2SO_3(aq.)$

Oxidation state of hydrogen on reactant side: +1

Oxidation state of hydrogen on product side: +1

Thus, the oxidation state of hydrogen is not changing.

Hence, the correct answer is $2Na(s)+2H_2O(l)\rightarrow 2NaOH(aq.)+H_2(g)$

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3 years ago

Which of the following can cause acid precipitation

bagirrra123 [75]

Answer:

C. The use of coal

Explanation:

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3 years ago

What is the mass of a 50 gram car in kilograms

lesya692 [45]

You would have to divide 50/1,000 to get 0.05kg B.

So the answer is 0.05

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4 years ago

4. Which of the following process is NOT part of wool extraction?

yKpoI14uk [10]

Answer:

Reeling is the only process not listed.

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3 years ago

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