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Pavlova-9 [17]
3 years ago
15

What ismole used for​

Chemistry
1 answer:
nordsb [41]3 years ago
8 0

Answer:

What is mole used for?

Explanation:

The mole is widely used in chemistry as a convenient way to express amounts of reactants and products of chemical reactions.

SI base units: Base unit (Dimensionless)

Symbol: mol  

Unit of: Amount of substance

Unit system: SI base unit

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Rank the following bonds in order of decreasing bond length, based on periodic trends, starting with the longest bond at the top
sattari [20]

Answer:

H-BI,H-Se,H-S,H-I,H-Br

Explanation:

One thing that must be kept in mind is that atomic size increases down the group and decreases across the period. The bond lengths of species are influenced by the relative sizes of atoms or ions present in the bond.

The bonds in the answer have been arranged on basis of their decreasing atomic size because the greater the atomic size of the atoms, the greater the bond length and vice versa.

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<em>When molecular hydrogen (H2) and oxygen (O2) are combined and allowed to react together, energy is released and the molecules of hydrogen and oxygen can combine to form either water or hydrogen peroxide.</em>

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2 years ago
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8 0
3 years ago
scandium47 has a half-life of 35s. suppose you have a 45g sample of scadium 47 how much of the sample remains unchanged after 14
Mars2501 [29]

 The much  of the sample that would remain  unchanged  after 140 seconds is 2.813 g

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=140 sec/ 35 s = 4 half life

Therefore 45 g after first half life = 45 x1/2 =22.5 g

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2 years ago
A nucleus with four protons has total positive charge
Sladkaya [172]
It would have a charge of 4+
7 0
3 years ago
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