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3 years ago

Why can characteristics properties be used to identify unknown substances

Chemistry

1 answer:

frozen [14]3 years ago

5 0

Characteristic properties are used because the sample size and the shape of the substance does not matter.

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What is the mass of 2.50 moles of potassium chlorate in grams

Sedaia [141]

Answer: 306 grams are there in 2.50 moles of potassium chlorate

Explanation

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

given mass of potassium chlorate = ?

Molar mass of potassium chlorate = 122.55 g/mol

Putting in the values we get:

$2.50=\frac{xg}{122.55g/mol}$

$x=2.50mol\times 122.55g/mol=306g$

306 grams are there in 2.50 moles of potassium chlorate

3 0

3 years ago

2K2SO4 <--- how many atoms are there in this formula?

jekas [21]

There are 14 atoms, the 2 at the front times' everything by 2, so there 4Ks, 2Ss and 8Os, altogether 14

3 0

3 years ago

What is the overall process of balancing an equation?

monitta

Answer:

You need to make sure the number of atoms of each element on the reactant side is equal to the number of atoms of each element on the product side. In order make both sides equal, you will need to multiply the number of atoms in each element until both sides are equal. :)

3 0

3 years ago

Liquid A is known to have a lower surface tension and lower viscosity than Liquid B. Use these facts to predict the result of be

Korvikt [17]

Answer: Option (B) is the correct answer.

Explanation:

Surface tension is defined as the attractive forces experienced by the surface molecules of a liquid by the molecules present beneath the surface layer of the liquid.

And, viscosity is defined as the ability of a liquid to resist its flow. When a substance has high viscosity then it is known as a viscous substance.

Since, it is given that viscosity of liquid B is more than liquid A. Therefore, liquid B has more resistive force on its surface as compared to liquid A. As a result, time taken by liquid B is more than time taken by liquid A.

Also, Surface tension = $\frac{Force}{Length}$

Surface tension of liquid B is more than liquid A. Therefore, $F_{B} > F_{A}$ .

Thus, we can conclude that tA will be less than tB.

8 0

3 years ago

Of these elements, which has the largest atomic radius?<br> Ar<br> S<br> Cl

VARVARA [1.3K]

The answer is CI because that is the largest

7 0

3 years ago