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Why is methylene blue used as an indicator of cell respiration?
because methylene blue turns colourless when it is reduced by hydrogen. during respiration hydrogen is produced and instead of reducing NAD, it reduces methylene blue and turns methylene blue colourless. if methylene blue goes from blue to colourless then this shows that the cell is respiring as it is producing a suffiecient amount of hydrogen to decolourise methylene blue
How will you test whether gas evolved in a reaction is H2?
One way to test if the gas evolved is hydrogen gas (H2) is to capture a sample of the gas and ignite it. Hydrogen gas burns with a clean, almost invisible flame. Another method is to pass the gas through a tube containing heated copper (II) oxide - if the gas is hydrogen, it will reduce the copper (II) oxide to form solid copper and water.
What are the two criteria for whether a change is chemical or physical?
Oxygen and hydrogen
Under what circumstances are hydrogen bonds important?
Under any circumstance they are involved in, hydrogen bonds are extremely important, whether because they are desired and necessary or undesired.
When a plant dies it contains atoms of carbon hydrogen and oxygen?
Among other atoms, but plants contain carbon, hydrogen and oxygen whether alive or dead.
What does an acid base indicator measure?
It indicates that the solution's range is above or below of its transition value. For example the transition value of phenolphthalein is around 9.0. Hence it shows a pink colour in basic solutions (pH>9) and colourless in acidic solutions.
What does an ion have to do with acids and bases?
The quantity of hydrogen ions in a solution indicates whether the solution is an acid or a base.
How would you know whether or not gas was hydrogen?
One way to determine if a gas is hydrogen is to perform the hydrogen pop test. This involves igniting a small sample of the gas with a flame; if the gas produces a 'pop' sound upon ignition, it is likely hydrogen. Another method is to use a hydrogen gas detector or sensor to analyze the composition of the gas.
How is the way in which carbon atoms bond to each important for the number of carbon-based compounds?
Hydrocarbons are molecules consisting of/containing only atoms of carbon and hydrogen. There are many different kinds of hydrocarbons based on different numbers of carbon atoms in the molecules and whether or not any of the carbons are connected by double bonds rather than single bonds.
Is h2 a atom or molecular?
H2 is the molecular formula for hydrogen gas; H is the chemical formula for one atom of hydrogen, whether it be gas, liquid, or solid.
How do you determine whether a gas given off during a chemical reaction is oxygen or hydrogen?
One way to determine whether a gas given off during a chemical reaction is oxygen or hydrogen is by performing a gas test. For example, the gas test for oxygen involves relighting a glowing splint when inserted into the gas. If the splint reignites, then the gas is oxygen. The gas test for hydrogen involves holding a lit match near the gas, and if a "pop" sound is heard, then the gas is hydrogen.
Does hydrogen gas rise in air?
Yes. Hydrogen is a gas, and all gases tend to diffuse. Whether or not air is present is irrelevant.
