Answer: D. Use tools to help improve their senses when they make observations.
Observation is the outcome of a scientific procedure, which is followed to answer the questions related to a scientific inquiry. In order to make observation scientists need to use tools that can help in improving their senses like visual, sensation and hearing aids, so as to make observation accurate, and conclusive in a research.
I need more characters but it is b
Answer:
Reduced species and oxidizing agent: sulfur in the form of sulfate.
Oxidized species and reducing agent: chromium in the form of chromous hydroxide.
Explanation:
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In this case, for the reaction:
We can see that the oxidation states of sulfur and chromium change from +6 to +4 and +3 to +6 respectively; in such a way, since the oxidized species is the same reducing agent because it undergoes an increase in the oxidation state, we infer that chromium is it as it goes from +3 to +6.
Moreover, since the reduced species is the same oxidizing agent because it undergoes a decrease in the oxidation state, we infer that sulfur is it as it goes from +6 to +4.
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Answer:
Blue Jay is the correct answer.
Explanation:
<span>Helium atom's Atomic Weight = He = 4.0026 g/mol.
Avagrado's number is = 6.023 x 10^23 molecules / mol.
In order to find the number of atoms in 535kg of helium blimp.
First we need to convert the weight of 535 kg to mol which can be done by multiplying the atomic weight of helium into present atom with respect to grams.
535 kg converted into grams ---> 535000 g
There fore 535000 g X 4.0026 g/mol = 133,663 mol. (Note The grams will get cancel as per multiplication rules)
Multiplying the avagadro's number with the equation we get:
133,663 mol *6.0221415 Ă— 10^23 molecules/mol= 8.04919303 Ă— 10^28 molecules.
Since Helium is having 2 Atoms :
8.04919303 Ă— 10^28 molecules *2= 1.60983861 Ă— 10^29 atoms
The No of Helium atoms in 535 kg of helium is 1.61 x 10^29.</span>
