b. False
Answer: True
Explanation:
A chemical reaction in which the oxidation number of an atom, ion or molecule changes due transfer of electrons between two reactants is known as oxidation-reduction reaction or redox reaction. In Redox reaction, the oxidising agent brings oxidation by gaining electrons and reducing it self.
Example:
Zn + Cu²⁺ → Zn²⁺ + Cu
Here, Cu²⁺ is an oxidizing agent which got reduced to Cu .
Thus, the given statement is true.
It's true that in an oxidation-reduction reaction, the oxidizing agent always undergoes reduction. The oxidizing agent is a substance that is capable of oxidizing other substances, meaning it causes them to lose electrons. By taking these electrons, the oxidizing agent itself is reduced.
In an oxidation-reduction reaction, also known as a redox reaction, the statement that the oxidizing agent always undergoes reduction is indeed true. The oxidizing agent is a substance that has the ability to oxidize other substances, meaning it causes them to lose electrons. In taking these electrons, the oxidizing agent itself is reduced. This is due to the principle that in a redox reaction, when one substance is oxidized (loses electrons), another substance must be reduced (gain electrons).
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Answer:
30 m³
Explanation:
Parameters given:
Initial volume of helium, V1 = 5 m³
Initial pressure in balloon, P1 = 30 kPa
Final pressure, P2 = 5 kPa
To find the volume of the balloon at that volume, we apply Boyle's law.
It states that at constant temperature, the pressure of a gas is inversely proportional to the volume of the gas.
Mathematically:
P = k / V
Where k = constant of proportionality
This implies that:
P * V = k
This means that if the pressure or volume of the gas changes at the same temperature, the product of the pressure and volume would be the same:
Hence:
P1 * V1 = P2 * V2
Hence, to find the final volume:
30 * 5 = 5 * V2
=> V2 = (30 * 5) / 5
V2 = 30 m³
The volume of the gas when the pressure is 5 kPa is 30 m³.
a. True
b. False
Answer:
Visible light is an example of electromagnetic waves.
Explanation:
Visible light is an example of electromagnetic waves. The visible light are the range in which the light is visible to the human eye. The wavelength of visible light varies from 400 nm to 700 nm.
The visible region consists of following light namely,
1. Violet : 380–450 nm
2. Blue : 450–485 nm
3. Cyan : 485–500 nm
4. Green : 500–565 nm
5. Yellow : 565–590 nm
6. Orange : 590–625 nm
7. Red : 625–740 nm
Hence, the visible light is an example of electromagnetic wave.