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Art [367]
2 years ago
12

Practice

Chemistry
1 answer:
krek1111 [17]2 years ago
4 0

The number of significant figures in each of the following numbers are as follows:

  • 640 cm³ - number of significant figures: 2
  • 200.0 mL - number of significant figures: 4
  • 0.5200 g - number of significant figures: 4
  • 1.005 kg - number of significant Figures: 4
  • 10,000 L - number of significant figures: 1
  • 20.900 cm - number of significant figures: 5

<h3>What is significant figures?</h3>

Significant figures are those figures that are meaningful with respect to the precision of a measurement.

In other words, a digit that is nonzero, followed by a nonzero digit,or (for trailing zeroes) justified by the precision of the derivation or measurement is a significant figure.

Based on the question, the number of significant figures in each of the following numbers are as follows:

  • 640 cm³ - number of significant figures: 2
  • 200.0 mL - number of significant figures: 4
  • 0.5200 g - number of significant figures: 4
  • 1.005 kg - number of significant figures: 4
  • 10,000 L - number of significant figures: 1
  • 20.900 cm - number of significant figures: 5

Learn more about significant figures at: brainly.com/question/14359464

#SPJ1

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What is the transfer of electrons in Al + Cl = AlCl3
otez555 [7]

Answer:

3 e⁻ transfer has occurred.

Explanation

This is a redox reaction.

  • Oxidation (loss of electrons or increase in the oxidation state of entity)
  • Reduction (gain of electrons or decrease in the oxidation state of the entity)
  • An element undergoes oxidation or reduction in order to achieve a stable configuration. It can be an octet or duplet configuration. An octet configuration is that of outer shell configuration of noble gas.
  • [Ne]= (1s²) (2s² 2p⁶)

A combination of both the reactions( Half-reactions) leads to a redox reaction.

Let us look at initial configurations of Al and Cl

[Al]= 1s² 2s² 2p⁶ 3s² 3p¹

[Cl]= 1s² 2s² 2p⁶ 3s² 3p⁵

Hence, Al can lose 3 electrons to achieve octet config.

and, Cl can gain 1e to achieve nearest noble gas config. [Ar]

This reaction can be rewritten, by clearly mentioning the oxidation states of all the entities involved.

Al⁰ + Cl⁰ → (Al⁺³)(Cl⁻)₃

Here, Aluminum is undergoing an oxidation(i.e loss of electrons) from: 0→(+3)

Chlorine undergoes a reduction half reaction (i.e gain of electrons) from: 0→(-1). There are 3 such chlorine atoms, hence 3 e⁻ transfer has occurred.

3 0
3 years ago
I need help with this anyone?
valkas [14]
Just look it up on goog^le or a chart
5 0
2 years ago
The energy changes in chemical reactions occurs when atoms _____ to form new substances.
Zanzabum

A chemical reaction is marked by new substance formation. The energy changes in chemical reactions occur when atoms <u>rearrange</u> to form new substances.

<h3>What is a chemical reaction?</h3>

A chemical reaction is said to be the process that is characterized by the formation of new substances by the alteration of the chemical composition and the properties of the compound or the molecule.

The reaction results in a new product by the rearrangement of the atoms of the reactant molecule by breaking and creating chemical bonds. The bonds are altered by the change in energy.

Therefore, <u>rearrangement </u>is the correct blank.

Learn more about chemical reactions, here:

brainly.com/question/26690612

#SPJ4

8 0
1 year ago
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