<span>Answer is: using </span><span>acid-base indicator
or pH indicators.</span>
<span>
</span>Acid-base indicators are usually weak acids or bases and
they are chemical<span> detectors for hydrogen or hydronium cations.
Example for acid-base indicator is
phenolphthalein (molecular formula C</span>₂₀H₁₄O₄). Phenolphthalein is <span>colorless in acidic solutions and pink in basic solutions.
Another example is methyl orange. It is red colour in acidic solutions and
yellow colour in basic solutions.</span>
Answer:
See figure 1 and 2
Explanation:
In this case, we can start with the general reaction. Acetanilide with bromine in acetic acid we will produce <u>p-bromo-acetanilide</u> (See figure 1).
In the reaction mechanism, we have as first step the attack of the double bond in the benzene ring to one of the Br atoms in bromine () and a positive carbon will be produced in benzene. This positive charge can be moved inside of the benzne ring producing the r<u>esonance structures A, B and D</u>. Resonance structure C is produced when a double bond is generating between the "N" atom and the carbon in the benzene ring.
The final step in the mechanism is when we remove the "H" atom in structure A to produce again the double bond.
See figure 2
I hope it helps!
Answer:
Hydrosphere:ocean currents
Explanation:
Earth's biosphere has to do with the parts of the earth where life exists. The biosphere includes portions of the earth such as the lithosphere (the outer part of the earth), the atmosphere, the hydrosphere(the region of the earth's water resources).
Cyrosphere refers to those portions of the earth in which water is in solid form or frozen, such as sea ice, lake ice,glaciers and frozen ground. For example, the waters in the Arctic and in Antarctica. Related topics includes glacier thickness.
Geosphere is made up of the solid part of the earth; its rocks, minerals and surface and interior landforms. Related topics in the geosphere include plate tectonics, mountain formation, ocean ridges, earth's mantle. etc.
Hydrosphere refers to all the regions where water is found on the earth. It includes, surface water, underground water, ice as well as water vapor. A related topic is ocean currents.