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tatiyna
4 years ago
12

Distinguish between elements,compound and mixture

Chemistry
1 answer:
Mrac [35]4 years ago
5 0
An element is a substance that can’t be broken down into simpler substances by chemical means, a compound is when two or more elements are combined chemically to form something new, and a mixture is when two or more substances are combined but not chemically.
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Describe the three possible decisions you can receive from an
NemiM [27]

Answer 2. Accept with minor revisions: Also known as conditional acceptance, this decision means that the paper requires minor changes for it to be ...

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Explanation:

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2 years ago
Which statement best describes the effect of radioactive decay on a nucleus?
KATRIN_1 [288]

When radioactive decay occurs, the original nucleus splits into daughter nuclei and the resulting nucleus is more stable than the original nucleus. The nucleus can be of a different element than the original.

Unstable nuclei often undergo radioactive decay. In a radioactive decay, the unstable nucleus is broken up into other nuclei. Usually, the nuclei formed during radioactive decay are smaller in mass compared to the original nucleus.

Also, the resulting nucleus is more stable than the original nucleus. The nucleus can be of a different element than the original.

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3 years ago
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3 years ago
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A 100.0-g sample of water at 27.0oC is poured into a 71.0-g sample of water at 89.0oC. What will be the final temperature of the
Sedbober [7]

<u>Answer:</u> The final temperature will be 52.74^oC

<u>Explanation:</u>

Calculating the heat released or absorbed for the process:

q=m\times C\times (T_2-T_1)

In a system, the total amount of heat released is equal to the total amount of heat absorbed.

q_1=-q_2

OR

m_1\times C\times (T_f-T_1)=-m_2\times C\times (T_f-T_2) ......(1)

where,

C = heat capacity of water = 4.184J/g^oC

m_1 = mass of water of sample 1 = 100.0 g

m_2 = mass of water of sample 2 = 71.0 g

T_f = final temperature of the system = ?

T_1 = initial temperature of water of sample 1 = 27^oC

T_2 = initial temperature of the water of sample 2 = 89.0^oC

Putting values in equation 1, we get:

100.0\times 4.184\times (T_f-27)=-71.0\times 4.184\times (T_f-89)\\\\171T_f=9019\\\\T_f=\frac{9019}{171}=52.74^oC

Hence, the final temperature will be 52.74^oC

6 0
3 years ago
The letters Cu, C, and Ca are all chemicals for elements<br> True or false
Oksi-84 [34.3K]

Answer:

true

Explanation:

cu is copper, c carbon, ca calcium

6 0
2 years ago
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