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3 years ago

Where does oxidation occur in an electrochemical cell

1 answer:

5 0

Anode

According to the mnemonic “Red Cat An Ox”, oxidation occurs at the anode and reduction occurs at the cathode. Since the reaction at the anode is the source of electrons for the current, the anode is the negative terminal for the galvanic cell.

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Why can't the subscripts be changed?

zlopas [31]

Subscripts cannot be changed because they are the ratio of the amount. And as we know, in a chemical equation/reaction, mass cannot be created nor destroyed. Therefore, we cannot change subscripts, however, we could change coefficients.

8 0

3 years ago

Read 2 more answers

Changes in temperature can often cause a change in the state of matter of objects. A decreasein temperature causes which of the

STALIN [3.7K]

Answer:

B. Water will freeze

because the latent heat of vapourization decreases.

5 0

3 years ago

Prior to the development of DNA fingerprinting, blood type could be used to determine possible parentage. Although it might prov

Anettt [7]

A parent with type A B blood can ever have a child child with type O blood.

Explanation:

An offspring gets an allele for blood type from every parent. Therefore unless both parents have blood type O the offspring cannot have blood type O.

A person with blood group O means they do not blood group antigen on their red blood cells. They cannot pass the antigens to their offspring. A person with AB means they have both antigens for A & B blood groups and can pass either to any of the offspring they have.

The passing down of the blood group alleles follow the Mendelian principles of independent assortment.

5 0

4 years ago

How much energy is needed to raise the temperature of a 200 g piece of lead by 250 o C?

devlian [24]

Answer: The amount of energy required to raise the given amount of temperature is 6400 J

Explanation:

To calculate the heat absorbed by the lead, we use the equation:

$q=mc\Delta T$

where,

q = heat absorbed

m = mass of lead = 200 g

c = heat capacity of lead = 0.128 J/g°C

$\Delta T$ = change in temperature = 250°C

Putting values in above equation, we get:

$q=200g\times 0.128J/g^oC\times 250^oC=6400J$

Hence, the amount of energy required to raise the given amount of temperature is 6400 J

4 0

3 years ago

If an element is a reactant or product in a chemical reaction, the reaction must be an oxidaton-reduction reaction. Why is this

Bezzdna [24]

Explanation:

Oxidation reduction reactions are the reactions in which one specie oxidizes and other reduces.

For example,

$2Na+2HCl\rightarrow H_2+2NaCl$

This is a oxidation reduction reaction because sodium in elemental state ( 0 oxidation state) oxidizes to Na⁺ in NaCl. Also H⁺ in HCl reduces to H° in H₂.

Elements are present in 0 oxidation state and either it is formed or consumed, its oxidation state has to be changed for a chemical reaction to occur. Hence, it is true.

8 0

4 years ago