CHEMISTRY HIGH SCHOOL

What a non-renewable resource is, Give 2 examples of non-renewable resources.

Answers

Answer 1
Answer:

Answer:

Non renewable resource is fossil fuels that cannot be replaced such as coal and oil

Explanation:
Answer 2
Answer:

Answer: coal and natural gas

Explanation: because it takes a long time for them to form

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Write the balanced equation for the reaction of aqueous Pb(ClO3)2 with aqueous NaI.

Answers

 The  balanced  equation for the  reaction  of aqueous Pb(ClO3)2  with aqueous NaI   is as below

Pb(ClO3)2(aq)  + 2NaI(aq)  → PbI2(s) +  2 NaClO3(aq)

    Explanation

 from the equation  above   1mole  of lead(ii) chlorate Pb(ClO3)2   react   with    2 moles  of sodium  iodide  to form   1 moles  of lead(ii)  iodide( PbI2)  and  2  moles  of sodium chlorate NaClO3.  
Pb(ClO_3)_(2(aq))+2NaI_((aq))=PbI_(2(s))+2NaClO_(3(aq))

Which radioisotope is used for diagnosing thyroid disorders?(1) U-238 (3) I-131
(2) Pb-206 (4) Co-60

Answers

The correct answer is option 3. The radioisotope used for diagnosing thyroid disorders is I-131. This isotope is used due to its low expense compared to other radioisotopes. I- 31 is a beta and gamma emitter used for the ablations of thyroid tumors.

Final answer:

I-131 (Iodine-131) is the radioisotope used for diagnosing thyroid disorders. It is selectively taken up by the thyroid gland and its emissions allow for imaging of the gland.

Explanation:

The radioisotope used for diagnosing thyroid disorders is I-131 (Iodine-131). This radioisotope is used in medical procedures due to its unique characteristics. When consumed, it is selectively taken up by the thyroid gland. I-131 emits beta particles and gamma radiation which allows for imaging of the thyroid gland. This in turn helps health professionals diagnose if the thyroid is functioning normally or if disorders such as hyperthyroidism or tumors are present.

Learn more about I-131 Radioisotope here:

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Corrosion is the process by which iron is oxidized by elemental oxygen. therefore oxygen is the (oxidizing / reducing) agent and (gives / accepts) electrons.

Answers

Answer:

Oxygen is the oxidizing agent and accept electrons

Explanation:

  • Corrosion is an example of a redox reaction which involves both reduction and oxidation process.
  • During corrosion a metal loses electrons and becomes oxidized to form a metal ion.  Therefore, oxygen is the oxidizing agent since it undergoes reduction by gaining electrons.
  • Therefore, during corrosion of iron, iron is the reducing agent and gives electrons, while oxygen is the oxidizing agent and accepts the electrons.

How do plants store glucose?

Answers

The model of photosynthesis used by biologists begins when chlorophyll splits a water molecule into hydrogen and oxygen. The oxygen from the water is a waste product that is released as a gas. In later stages of photosynthesis, carbon dioxide from the air and hydrogen from the water unite to form glucose. Photosynthesis usually takes place in the leaves of green plants. The food produced is a simple sugar called glucose. Some of the food made during  photosynthesis is used by plants for their growth and development. The rest is stored in the plant.

The reduced vapor pressure at high altitudes causes a liquid to boil at a temperature.A. Lower
B. Higher

Answers

Answer:

            Lower Temperature

Explanation:

                        The boiling point is defined as the temperature at which the vapor pressure of a given liquid becomes equal to the external pressure or atmospheric pressure. Boiling point is mainly effected by following factors:

1) Inter-Molecular Interactions:

                                                     Greater the intermolecular interactions greater will be the boiling point because more energy is required to overcome these intermolecular interactions.

Example:

                                          Water  =  100 °C

                              Diethyl ether  =  34.5 °C

Water requires more energy because it contains hydrogen bond interactions which are considered the strongest intermolecular interactions. While, Diethyl ether lacks Hydrogen bondings.

2) External Pressure:

                                    The boiling point also varies with changing the external pressure for the same solvent. Greater the external pressure greater will be the boiling points and vice versa.

Example:

Water:

                    External Pressure                       Boiling Point

                                1 atm                                         100 °C

                             0.921 atm                                     98 °C

                             0.425 atm                                     72 °C
At higher altitudes (and thus lower atmospheric pressures), water boils at a lower temperature. This is because the lack of vapor pressure at that altitude doesn't constrain the speed of the molecules with barometric pressure. Therefore, the water begins boiling at a lower temperature. This is often a disadvantage because even if the water is boiling, it won't be hot enough for meals (which is why heat and temperature are distinct). That's why we have pressure cookers, which manage to keep a stable boiling point.
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What is the #1 or main component of the earths ancient atmosphere?

Answers

I am pretty sure it was composed of mostly CO₂.  
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