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velikii [3]
3 years ago
14

Helpppppppppp!!!!!!!!!​

Chemistry
1 answer:
professor190 [17]3 years ago
3 0

Answer:

a

Explanation:

the solution is extremely acidic and will dissolve the zinc rod

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If we have equal masses of copper at 80oC and water at 20oC and we put them together, what is the final temperature?
Ket [755]

Answer:

The final temperature will be close to 20°C

Explanation:

First of all, the resulting temperature of the mix can't be higher than the hot substance's (80°C) or lower than the cold one's (20°C). So options d) and e) are imposible.

Now, due to the high heat capacity of water (4,1813 J/mol*K) it can absorb a huge amount of heat without having a great increment in its temperature. On the other hand, copper have a small heat capacity (0,385 J/mol*K)in comparison.

In conclusion, the copper will release its heat decreasing importantly its temperature and the water will absorb that heat resulting in a small increment of temperature. So the final temperature will be close to 20°C

<u>This analysis can be done because we have equal masses of both substances. </u>

6 0
4 years ago
What element is oxidized in the following reaction?
Vikentia [17]

Cu since the oxidation number of Cu is changed from 0 to +2. It means it is oxidized as per loss of two electrons.

7 0
4 years ago
If a temperature increase from 12.0 ∘c to 22.0 ∘c doubles the rate constant for a reaction, what is the value of the activation
Alex73 [517]

Answer: 48,501 J/mol


Explanation:


1) Action barrier = activation energy = Ea


2) Data:


i) T₁ = 12°C = 12 + 273.15 K = 285.15K

ii) T₂ = 22°C = 22 + 273.15 K = 295.15 K

iii) rate constant = k: k₂ / k₁ = 2


iv) Ea = ?


3) Formula:


Arrhenius' law gives the relationship between the constant of reaction and the temperature:


k=Ae^{-\frac{Ea}{RT}}


4) Solution


By arranging the formula, you get:


㏑[k₂/k₁] =Ea/R [1/T₁ - 1/T₂]


Replace k₂ = 2k₁; T₁ = 285.15; and T₂ = 295.15


ln[2] = Ea/8.314 J/K mol × [1/285.15 - 1/295.15]K


Ea = ln [2] × 8.314 J/K mol / [1.18818×10⁻⁴K] = 48,501 J/mol





6 0
4 years ago
What is the percentage composition of chlorine in Nacl
nydimaria [60]
35.45 x 100% = 60.66%
5 0
3 years ago
What kind of high energy radiation is released from nuclear reaction ?
Brut [27]

The energy released in a nuclear reaction may appear only in one of these three ways Kinetic energy of the products. The emission of gamma rays. And gamma rays are emitted by unstable nuclei in their own transition that is from a high energy state that than goes to a lower energy state that is properly known as gamma decay.

8 0
3 years ago
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