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3 years ago

When were the bohr model and the quantum-mechanical model for the atom developed? what purposes do these models serve?

1 answer:

4 0

Both the bohr model and the quantum-mechanical model for the atom were developed in the early 1900's. These models serve to explain how electrons are arranged within the atomic structure and how the electrons affect the chemical and physical properties of each element.

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A solution is known to contain either Ni2 or Cr3 . Addition of what single (1 only) reagent would identify which ion is present?

galina1969 [7]

Answer:

Explanation:

From the periodic table; both elements given are from the same group 3.

To test for which ion will be present in the experiment;

We added 6M aqueous sodium hydroxide in excess.

This process is followed by the addition of hydrogen peroxide H2O2 while stirring.

Heat is then applied to the solution.

After we've carried out those process;

We will notice the following;

If $Ni^{2+}$ is present, then a green $NI(OH)_2$ precipitate will be formed

If $Cr^{3+}$ is present,then a yellow-colored $CrO^{2-}_{4}$ will be formed.

6 0

3 years ago

Question 10 of 23

Margarita [4]

Answer: O D. A digital signal moves between a discrete number of values.

Explanation:

The digital signals are considered more reliable over the analog signals as they encode the information in a coded form. The bits or samples of the data are transmitted and converted into digital and numerical value. The stream of encoded data is in the form of continuous data at regular time intervals. It provides information in waveform and the data is in compact form. The data is in the form of binary bits 0 and 1 so greater the number of bits greater will be the greater will be the resolution of the information.

7 0

3 years ago

A student is working with four different solid substances: sodium calcium copper and iodine. which substance is most likely to b

Alenkasestr [34]

Answer:

iodine

Explanation:

The substance that can break easily from the list of substances is the iodine.

Iodine exists as a molecular solid and hence, the molecules are held together by weak Van Der Waal's forces. Iodine thus has characteristic properties of typical molecular solids which include being able to be broken into pieces easily (brittle), low melting and boiling points, insolubility in water, among other properties.

The characteristics of iodine are unlike sodium, calcium, and copper that exist as metal which is hard, tough with high tensile strengths.

5 0

3 years ago

Read 2 more answers

What is the complete electron configuration of tin?

Leya [2.2K]

Kr 4d10 5s2 5p2 would be your answer.

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4 years ago

GC-mass spectrometry is used to find the ________ of each compound in a ________. Group of answer choices none of these molecula

sineoko [7]

Answer:

mixture of compounds molecular weight

Explanation:

Gas Chromatography-mass spectrometry is used to find the mixture of compounds of each compound in a molecular weight. The Gas Chromatography also known as Mass Spectrometry (GC/MS) is an instrument that is used to separate chemical mixtures and identifies the components at a molecular level. It is one of the most accurate tools used for analyzing samples of the environment.

6 0

3 years ago