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satela [25.4K]
3 years ago
9

Select all the correct answers. Which substances are made up of polymers? DNA a glass bottle ice crystals the proteins in hair r

ubber car tires
Chemistry
1 answer:
____ [38]3 years ago
4 0

Answer:

DNA, the proteins in hair, rubber car tires.  

Step-by-step explanation:

<em>Polymers</em> are large molecules consisting of long chains of small repeating units.

DNA is a natural polymer that consists of hundreds of millions of repeating units called <em>nucleotides</em><em>.</em>

Hair protein consists of long chains of <em>amino acid</em> repeating units.

The rubber in car tires is a mixture of natural and synthetic rubber. Natural rubber consists of long chains of <em>isoprene repeating units</em>. In one type of synthetic rubber, the repeating units are <em>butadiene and styrene molecules</em>.

The <em>glass in a bottle</em> is not an organic polymer. However, some chemists consider it to be a highly cross-linked inorganic polymer of SiO₂.

<em>Ice crystals</em> are not even inorganic polymers, because the water molecules are held together only by hydrogen bonds, not covalent bonds.

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A chemist fills a reaction vessel with 3.82 atm methanol (CH,OH) gas, 7.56 am oxygen (O2) gas, 5.29 atm carbon dioxide (CO2) gas
alisha [4.7K]

<u>Answer:</u> The Gibbs free energy of the given reaction is 1.379\times 10^3kJ

<u>Explanation:</u>

The equation used to calculate Gibbs free energy change is of a reaction is:

\Delta G^o_{rxn}=\sum [n\times \Delta G^o_f_{(product)}]-\sum [n\times \Delta G^o_f_{(reactant)}]

For the given chemical reaction:

2CH_3OH(g)+3O_2(g)\rightarrow 2CO_2(g)+4H_2O(g)

The equation for the Gibbs free energy change of the above reaction is:

\Delta G^o_{rxn}=[(2\times \Delta G^o_f_{(CO_2(g))})+(4\times \Delta G^o_f_{(H_2O(g))})]-[(2\times \Delta G^o_f_{(CH_3OH(g))})+(3\times \Delta G^o_f_{(O_2(g))})]

We are given:

\Delta G^o_f_{(H_2O(g))}=-228.57kJ/mol\\\Delta G^o_f_{(CO_2(g))}=-394.36kJ/mol\\\Delta G^o_f_{(CH_3OH(g))}=-161.96kJ/mol\\\Delta G^o_f_{(O_2(g))}=0kJ/mol

Putting values in above equation, we get:

\Delta G^o_{rxn}=[(2\times (-394.36))+(4\times (-228.57))]-[(2\times (-161.96))+(3\times (0))]\\\\\Delta G^o_{rxn}=-1379.08kJ/mol

The equation used to Gibbs free energy of the reaction follows:

\Delta G=\Delta G^o+RT\ln Q_{p}

where,

\Delta G = free energy of the reaction

\Delta G^o = standard Gibbs free energy = -1379.08 kJ/mol = -1379080 J/mol  (Conversion factor: 1 kJ = 1000 J)

R = Gas constant = 8.314 J/K mol

T = Temperature = 25^oC=[273+25]K=298K

Q_{p} = Ratio of concentration of products and reactants = \frac{(p_{CO_2})^2(p_{H_2O})^4}{(p_{CH_3OH})^2(p_{O_2})^3}

p_{CO_2}=5.29atm\\p_{H_2O}=3.89atm\\p_{CH_3OH}=3.82atm\\p_{O_2}=7.56atm

Putting values in above expression, we get:

\Delta G=-1379080J/mol+(8.314J/K.mol\times 298K\times \ln (\frac{(5.29)^2\times (3.89)^4}{(3.82)^2\times (7.56)^3}))\\\\\Delta G=-1379039J=1379.039kJ=1.379\times 10^3kJ

Hence, the Gibbs free energy of the given reaction is 1.379\times 10^3kJ

5 0
4 years ago
Which of the following statements about natural resources is correct
trasher [3.6K]

Answer:

The right choice is "wind power requires a lot of space and depends on local weather patterns "

Explanation:

  1. solar power produces harmful chemicals
  • it is incorrect because solar power doesn't produce any chemicals

    2. geothermal power requires more land than other power plants  

  •   it is incorrect because geothermal power requires digging a stable 5 km-deep shaft not a land

    3. nuclear power produces small amounts of energy from large masses

  • it is incorrect because nuclear power produces large amounts of energy from small masses.

So the right choice is "wind power requires a lot of space and depends on local weather patterns "

7 0
3 years ago
Please help me with this work
Dominik [7]
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3 0
3 years ago
How many electrons are in the second energy level of an atom of each element
Evgesh-ka [11]
Up to 8 anything above that you add another level
5 0
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4NH3(g) + 3O2(g) --&gt; 2N2(g) + 6H2O(l)
inessss [21]

Answer:

left, increase

Explanation:

If oxygen gas is removed from the system, then the equilibrium will shift to the __left_____ and the amount of NH3 gas will _increase________.

7 0
4 years ago
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