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4 years ago

Difference between compounds and mixtures. How do you separate them

2 answers:

5 0

♥ Mixture refers to any substance which is composed of molecules of different types.
♥ The different elements and compounds in the mixture retain their original physical properties even after combining to form a mixture.

Mandarinka [93]4 years ago

4 0

Mixture- each substance stays the same
Compound - has properties different from the elements.

However with a compound a chemical reaction is required to separate them but a mixture is easily to separate.

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43. We have a radioactive isotope called RI which has a half-life of 12 million years. A geologist

ioda

Answer: Thus 3 half lives have taken place.

Explanation:

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant

a - x = amount left after decay process

a) for completion of half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

$t_{\frac{1}{2}}=\frac{2.303}{k}\log\frac{100}{50}$

$t_{\frac{1}{2}}=\frac{0.693}{k}$

Number of half lives = $\frac{\text {total time}}{\text {half life}}=\frac{36million}{12million}=3$

Thus 3 half lives have taken place.

8 0

3 years ago

Cobalt, Co, has 27 electrons. Write out the entire electron configuration for cobalt using spdf notation.

Hatshy [7]

Answer:

Co = 1s2 2s2 2p6 3s2 3p6 4s2 3d7

Explanation:

Number of electrons = 27

The closest noble gas before cobalt is Argon and argon has 18 electrons.

Co = [Ar] ; Remains 27 - 18 = 9 more electrons to fill.

The next orbital in order of increasing energy is the 4s orbital. However it can only hold a maximum of 2 electrons.

We have;

Co = [Ar] 4s2; Remains 27 - 20 = 7 more electrons to fill.

The next orbital in order of increasing energy is the 3d orbital. It can have a maximum of 10 electrons.

So we have;

Co = [Ar] 4s2 3d7

The electronic configuration of Ar = 1s2 2s2 2p6 3s2 3p6

This means the entire configuration of cobalt is;

Co = 1s2 2s2 2p6 3s2 3p6 4s2 3d7

8 0

3 years ago

Potassium Chlorate decomposes according to the reaction below.

lesya692 [45]

Answer:

1.75L

Explanation:

Reaction of decomposition is:

2KClO₃(s) → 2KCl(s) + 3O₂(g)

We determine moles of salt:

4.35 g . 1 mol /122.55 g = 0.0355 moles

Ratio is 2:3. 2 moles of salt can produce 3 moles of oxygen

Then, our 0.0355 moles of chlorate may produce (0.0355 . 3)/ 2 = 0.0532 moles.

We have determined, moles of gas and we have data of pressure and temperature. To find out the volume, we apply the Ideal Gases Law:

We convert T° from °C to K → 27°C + 273 = 300K

P . V = n . R . T

0.75 atm . V = 0.0532 mol . 0.0821 L.atm/mol.K . 300K

V = (0.0532 mol . 0.0821 L.atm/mol.K . 300K) / 0.75 atm

V = 1.75 Liters

7 0

3 years ago

What is the key difference between element and compound

olga nikolaevna [1]

Answer and Explanation:

DIFFERENCE BETWEEN ELEMENT AND COMPOUND :

An element is made up of same type of atoms whereas a compound is made up of different type of atoms.
A compound can be separated by chemical methods but an element can not be separated by chemical methods.
Example of element is Cu Fe C and example of compound is $CO_2\ NO_2 \ NH_3$ etc
Elements can not be split into different substances but compound can be splited into different substances

3 0

3 years ago

If measurements are made, then they are more precise on a larger scale.?

Anuta_ua [19.1K]

Answer:

No.

Explanation:

According to the formula б/X=б/√n, as more measurements are made, the uncertainty gets smaller.

7 0

3 years ago