Answer:
Explanation:
The Law of Conservation of Mass states that matter cannot be destroyed or created.
That is, the total mass before and after the reaction stays the same.
A + B ⟶ C
mass/g: 2 7 x
All of these elements have an electron configuration<span> that ends with </span><span>s1</span><span>. Francium's properties have not been determined experimentally, because so far there has not been enough of it to experiment with </span>Sodium is group 1/IA, the alkali metals, on the periodic table. Therefore, the other elements in this group will have similar properties as sodium. These would include, lithium<span>, potassium, </span>rubidium<span>, and </span>cesium<span>.
Hope this is the answer
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Answer:
Colourless
Explanation:
We know that Y^3+ has the electronic configuration of;
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 (the 5s and 4d levels are empty).
According to the crystal field theory, the colour of complexes result from transitions between incompletely filled d orbitals.
As a result of this, complexes with empty or completely filled d orbitals are colourless. Thus, [Y(H2O)6]3 is colourless according to the Crystal Field Theory.
Answer:
Nickel is extracted from nickel oxide by reduction with carbon. Nickel is a metal which react with atmospheric oxygen which is very reactive in order to protect the inner surface of metal. Carbon extract oxygen which is attached to the nickel in the form of nickel oxide because carbon is more reactive so it made a chemical bonds with oxygen and nickel oxide is converted into a pure nickel.
When repeated measurements of the same quantity are very close to one another they are termed as precise measurements.
<u>Explanation:
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An experiment is repeated two to three times and the outcomes were checked to have similar values to attain precision of the measurements. The accuracy and precision are the important in attaining correct measurements.
The accuracy is the closest true value obtained from the measuring instrument. But to get precise results, the measurements were taken repeatedly and then analyzed whether the values obtained are similar or varying significantly.
If the repeatedly measured values are very close to one another that means the measured quantities are precisely taken. All the values are precise in nature.