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4 years ago

On the periodic table, elements are arranged according to their mass numbers. TrueFalse

Chemistry

1 answer:

ycow [4]4 years ago

3 0

Explanation:

FALSE

ITS NOT ALWAYS NECESSARY TO BE IN AN ORDER

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Solid NaCl is produced by the

soldi70 [24.7K]

Answer:

2Na (s) + Cl2 (g) -->2NaCl (s) + heat

Explanation:

7 0

3 years ago

How do you tell if the sample of matter is solid,liquid or gas?

soldi70 [24.7K]

There is one simple way to determine between solids, liquids, and gases. Are you able to move the substance? And if you are, how does it move? If it takes on the shape of its new container, it is a liquid. For example, if you pour water from a cup into a bowl, it will fill the bowl, not stay in the same shape as it was in the cup. However, if you put a marble in a cup and then pour the marble into the bowl, it will remain the same shape, and is therefore a solid. If you move a gas into a container, and the container is not sealed, it will not remain in the same shape.

5 0

3 years ago

Read 2 more answers

Names for following compounds. a)CO² b)NaCI c)S²CI² d)NaF

babymother [125]

Co² = Carbon dioxide
NaCl = Sodium Chloride
S²Cl² = Sulphur Chloride
NaF = Sodium Fluoride

5 0

3 years ago

Help asaappohhhshe plzzzzgdjwvzujeisbjcjj plzzz

Mazyrski [523]

Answer:

6. IDK, google only says glacial erratics

7. Deposition

8. Building landfills, I think

Explanation:

4 0

4 years ago

Read 2 more answers

The natural distribution of the isotopes of a hypothetical element is 60.795% at a mass of 281.99481 u, 22.122% at a mass of 283

fenix001 [56]

Answer: The average atomic mass of the element is 283.291 amu

Explanation:

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$ .....(1)

For isotope 1:

Mass of isotope 1 = 281.99481 amu

Percentage abundance of isotope 1 = 60.795 %

Fractional abundance of isotope 1 = 0.60795

For isotope 2:

Mass of isotope 2 = 283.99570 amu

Percentage abundance of isotope 2 = 22.122 %

Fractional abundance of isotope 2 = 0.22122

For isotope 3:

Mass of isotope 3 = 286.99423 amu

Percentage abundance of isotope 3 = [100 - (60.795 + 22.122)] = 17.083 %

Fractional abundance of isotope 1 = 0.17083

Putting values in equation 1, we get:

$\text{Average atomic mass of element}=[(281.99481\times 0.60795)+(283.99570\times 0.22122)+(286.99423\times 0.17083)]\\\\\text{Average atomic mass of element}=283.291amu$

Hence, the average atomic mass of the element is 283.291 amu

5 0

4 years ago