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rosijanka [135]
3 years ago
8

Can periodic table indicates occurrance of the elements, why?​

Chemistry
1 answer:
Allushta [10]3 years ago
6 0

Answer: No

Explanation:

A periodic table can be defined as the table in which the row of chemical elements are present. All the elements of the row have same number of electron shells.

The arrangement of elements is based on atomic numbers, electron shell model and other chemical properties. The elements are placed in increasing order of atomic number.

This table does not give information about the occurrence of the elements.

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Sodium (Na) and chlorine (Cl) combine together to form table salt (sodium chloride). Looking at the periodic table, which elemen
hodyreva [135]

Answer:

A. Iodine (falls in the same group as chlorine)

Explanation:

7 0
4 years ago
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Substances like neon , which is a gas at room temperature and pressure, can often be liquified or solidified only at very low te
marshall27 [118]

Answer:

Condenses at 27.25K.

Freezes at 24.65K.

Explanation:

In order to solve this above question, there is is need to make use of the following equation. The main idea here is to convert degree celsius to Kelvin. Hence,

0°C + 273.15 = 273.15K---------------------(1).

Therefore, we will make use of the above equation (1) and slot in the values for at degree celsius at which it condenses and at degree celsius at which it freezes.

So, we have at temperature at which it condenses:

-245.9°C + 273.15 = 27.25K.

Also, we have at temperature at which it freezes.

-248.5°C + 273.15 = 24.65K.

8 0
3 years ago
Burning magnesium gives us magnesium oxide. This is an example of a reaction.
frez [133]

Answer: -

Oxidation, Oxygen

Explanation: -

Burning of magnesium gives us magnesium oxide.

The chemical symbol of magnesium is Mg.

The chemical symbol of magnesium oxide is MgO.

So, the balanced chemical equation is

2Mg + O2 – 2 MgO.

We see that the element added is O Oxygen. So, the reaction is oxidation.

In oxidation always, oxygen is the common element involved in all chemical reactions of this kind.

5 0
4 years ago
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Sally's index finger is 85 mm long, how long is her index finger in decimeters?
yanalaym [24]

Answer:0.85 decimeters

Explanation:

8 0
3 years ago
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A sample of gas has an initial volume of 4.2 L at a pressure of 736 mmHg. If the volume of the gas is increased to 9.0 L , what
Lana71 [14]


We will use Boyle's law. P = 1/V which simply means pressure is inversely proportion to volume at a constant temperature. We will assume temperature here does not change. Since we have two pressure/volume points, we use this version of Boyle's law.

P1 V1 = P2 V2

P  is pressure and V is volume

In our case:

P1 is 736, V1 is 4.2 while  V2 is 9.0 but P2 is unknown. This is what we need to find out.

736 * 4.2 = P2 * 9.0

P2 = 736 * 4.2 / 9.0

P2 = 3091.2 / 9.0

P2 = 343.5

Therefore the new pressure 343 mm/hg

Here we see that the increase in volume causes decrease in pressure in total agreement with Boyle's law.

8 0
3 years ago
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