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3 years ago

How can you tell if a reaction is an oxidation-reduction reaction?

1 answer:

const2013 [10]3 years ago

6 0

REDOX is the process whereby electrons are transfered from one specie to another, via oxidation-reduction.

In a chemical reaction, when one specie causes another to gain electrons, it is called a reductant (it gives electrons). This is an oxidation reaction, because it loses electrons of its own. While the other specie goes through reduction from gaining electrons.

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The addition of 250.0 J to 30.0 g of copper initially at 22.0°C will change its temperature to what final value? (Specific heat

WINSTONCH [101]

Answer:

Final temperature = $43.53^{\circ} C$

Explanation:

Given that,

Heat added, Q = 250 J

Mass, m = 30 g

Initial temperature, T₁ = 22°C

The Specific heat of Cu= 0.387 J/g °C

We know that, heat added due to the change in temperature is given by :

$Q=mc\Delta T\\\\Q=mc(T_2-T_1)\\\\\dfrac{Q}{mc}=(T_2-T_1)\\\\T_2=\dfrac{Q}{mc}+T_1$

Put all the values,

$T_2=\dfrac{250}{30\times 0.387}+22\\\\=43.53^{\circ} C$

So, the final temperature is equal to $43.53^{\circ} C$ .

8 0

3 years ago

Adding energy has no effect on the rate of evaporation? True or False ?

zlopas [31]

Answer:

False

Explanation:

Evaporation occurs when molecules in a liquid gain enough energy that they overcome attractions from other molecules and break away to become a gas. Adding energy increases the rate of evaporation.

Hope this helped!

5 0

3 years ago

What kind of frog is this!?

Yanka [14]

This kind of frog is an anaxyrus fowleri

4 0

3 years ago

Help please ill give you Brainliest!!

Svet_ta [14]

Answer:

A) At stage 1 it begins to transmit electrons

B) Electron #2 because it jumped from level 1 to level 4

Explanation:

4 0

3 years ago

Somebody help please I'm really confused about the whole question.

zysi [14]

A 10.0g
ok hope this helps

5 0

3 years ago