Friction because smooth ice provides very little resistance against objects, like ice skates being dragged across its surface.
If a beaker of water is mixed with BTB, the colour of water will turn to yellow to determine the presence of carbon dioxide in the water.
What kind of chemical is Bromothymol Blue (BTB) ?
A pH indicator is bromothymol blue. It is frequently used to determine whether carbonic acid is present in a liquid, which is one application where it is necessary to measure chemicals that would have a pH that is quite neutral. The sodium version of the acid indicator is usually offered in solid form.
It displays acids and bases by changing color, making bromothymol blue a pH indicator. Bromothymol blue changes color when an acid or base (such as sodium sulfite) is added. It becomes yellow when an acid is added. A neutral color is green (like water).
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Answer: Na2SO4
The molecular formula for sodium sulphur and oxygen is: (Na2SO4)
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Weigh them both and there you go