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irga5000 [103]
3 years ago
8

After a hypothesis is tested a scientist must do what next ?

Chemistry
1 answer:
zubka84 [21]3 years ago
3 0
Test the hypothesis in an expirement!
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14. Calculate the mass in grams of oxygen required to react completly with 0.75 moles of Aluminum.
cluponka [151]
  • 3mols of O_2 react with 4mol of Al
  • 3/4=0.75mol O_2 react with 1mol of Al

Moles of O_2:-

  • 0.75(0.75)
  • 0.5625mol

Mass of O_2:-

  • moles(Molar mass)
  • 0.5625(32)
  • 18g

Option B

8 0
2 years ago
The half-life of a positron is very short. It reacts with an electron, and the masses of both are converted to two gamma-ray pho
sp2606 [1]

Explanation:

(a)   It is known that relation between energy and mass is as follows.

            E = 2 \times mc^{2}

where,    E = energy

              m = mass

              c = speed of light = 3 \times 10^{8} m/s

As it is given that mass is 9.109 \times 10^{-31} kg. So, putting the given values into the above formula as follows.

             E = 2 \times mc^{2}

                       = 2 \times 9.109 \times 10^{-31} kg \times 3 \times 10^{8}m/s

                       = 1.638 \times 10^{-13} J

Therefore, we can conclude that the energy produced by the reaction between one electron and one positron is 1.638 \times 10^{-13} J.

(b) When gamma ray photons are produced then they will have the same frequency. Relation between energy and frequency is as follows.

                    E = h \times \nu   ..... (1)

where,     h = plank's constant = 6.626 \times 10^{-34} J.s

              \nu = frequency

Also,     E = 2 \times mc^{2} ........ (2)

Hence, equating equations (1) and (2) as follows.

                    h \times \nu = 2 \times mc^{2}        

So,    

6.626 \times 10^{-34} Js \times \nu = 1.638 \times 10^{-13} J

                           \nu = 1.236 \times 10^{20} Hz

Thus, we can conclude that the frequency is 1.236 \times 10^{20} Hz.

5 0
3 years ago
Which of the following is a legume?
nirvana33 [79]

Answer:

The answer to your question is Clover

Explanation:

Legumes are plants or the seed of plants. Legumes are harvested for human consumption, for livestock forage and silage.

These plants are also important during the Nitrogen cycle due to they fix nitrogen.

Examples of legumes are:

Beans, alfalfa, clover, lentils, peas, mesquite, carob, tamarind, peanuts, soybeans, etc.

5 0
3 years ago
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Which component of the electron-transport chain is required to combine the pair of electrons with molecular oxygen?
Zina [86]

n oxidative phosphorylation, ATP production is coupled to the events in the electron-transport chain

8 0
2 years ago
What is a physical property of copper
lozanna [386]
A physical property of copper is that copper is a good conductor of heat.
4 0
3 years ago
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