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Dafna11 [192]
4 years ago
12

Match each scientist with thr contribution he made to the arrangement of the elements in the periodic table​

Chemistry
1 answer:
Kobotan [32]4 years ago
6 0

Answer:

Dmitri Mendeleev

used patterns to predict undiscovered

elements

Johann Wolfgang Dobereiner

created groups of three elements,

each based on similar properties

John Newlands

arranged elements according to their

atomic mass

Antoine Lavoisier,

divided elements into four categories

✓

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What are the purposes of a chemical equation? Check all that apply.
Jlenok [28]

Answer:

to show how substances in a chemical reaction interact

to shorten the explanation of a chemical reaction

to help keep track of atoms in a chemical reaction

Explanation:

5 0
3 years ago
Ethers are almost always used as solvents for Grignard reactions, all of the reasons why they work so well are not fully underst
vfiekz [6]

Answer:

Ether is used as a solvent because it is aprotic and can solvate the magnesium ion.

Explanation:

Solubility in Water

Because ethers are polar, they are more soluble in water than alkanes of a similar molecular weight. The slight solubility of ethers in water results from hydrogen bonds between the hydrogen atoms of water molecules and the lone pair electrons of the oxygen atom of ether molecules.

Ethers as Solvents

Ethers such as diethyl ether dissolve a wide range of polar and nonpolar organic compounds. Nonpolar compounds are generally more soluble in diethyl ether than alcohols because ethers do not have a hydrogen bonding network that must be broken up to dissolve the solute. Because diethyl ether has a moderate dipole moment, polar substances dissolve readily in it.

Ethers are aprotic. Thus, basic substances, such as Grignard reagents, can be prepared in diethyl ether or tetrahydrofuran. These ethers solvate the magnesium ion, which is coordinated to the lone pair electrons of diethyl ether or THF. Figure attached, shows the solvation of a Grignard reagent with dietheyl ether.

The lone pair electrons of an ether also stabilize electron deficient species such as BF3 and borane (BH3). For example, the borane-THF complex is used in the hydroboration of alkenes (Section 1

5 0
4 years ago
Which cell organelle is where proteins are made? A. nucleus B. ribosome C. vacuole D. mitochondrion
N76 [4]

Answer:

B. ribosome

Explanation:

In the ribosomes, the codons get paired with anti codons to create a polypeptide or protein.

5 0
4 years ago
Read 2 more answers
What is the main reason metals such as silver and copper are used in making coins
Tanya [424]

Answer:

The alloys used to make coins are usually Copper, Zinc and Nickel. There are several reasons: The alloy must be very hard to withstand the use and circulation of the coin to not wear out soon. Then, the alloy must have a value less than the value of the currency to avoid that are founded and sold as mere metals.

Explanation:

7 0
4 years ago
Rank these photons in terms of increasing energy:<br> (a) blue (λ=453nm)
alexira [117]

The increasing order of photons in terms of energy is Er < Ey < Eb

A photon is a tiny particle of electromagnetic radiation and its energy is proportional to the frequency and rest mass as zero.

By using the formula:

E = h * ν

E = h * c / λ

h = planks constant

c = speed of light

Since h * c is constant

E is inversely proportional to wavelength  λ

For blue:

λ = 453 nm

Eb= k / 453

where k is constant

For red:

λ = 660 nm

Er = k / 660

For yellow:

λ = 595 nm

Ey = k / 595

Therefore,

The increasing order of photons in terms of energy is

Er < Ey < Eb.

For more information click on the link below:

brainly.com/question/15946945

# SPJ4

Complete question:

Rank the following photons in terms of increasing energy: (a) blue (λ = 453 nm); (b) red (λ = 660 nm); (c) yellow (λ = 595 nm).

8 0
2 years ago
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