Chemistry : asked on mrus
 08.03.2022

Calculate the atomic mass of element "X", if it has 2 naturally occurring isotopes with the following masses and natural abundances: X-45 44.8776 amu 32.88% X-47 46.9443 amu 67.12%

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17.02.2022, solved by verified expert
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( About ) 46.26 amu

Explanation:

First, let us apply the following formula,

Atomic Mass = [ ( mass of isotope 1 )( fractional abundance of 1 ) ] + [ ( mass of isotope 2 )( fractional abundance of 2 ) ]

Now fractional abundance of each element is taken as the decimal form of each percent of the isotopes. 32.88 percent corresponds to isotope 1, respectively 67.12 percent corresponds to isotope 2,

Fractional Abundance of Isotope 1 = 32.88 / 100 = 0.3288,

Fractional Abundance of Isotope 2 = 67.12 / 100 = 0.6712

Atomic Mass = [ ( 44.8776 amu )( 0.3288 ) ] + [ ( 46.9443 amu )( 0.6712 ) ],

Atomic Mass = ( About ) 46.26 amu

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Physics
Step-by-step answer
P Answered by Specialist
Question no. 1:

Controlled experiment is an experiment which is designed to test a variable, which can be changed during the experiment.

Explanation:

Hence in this experiment, the importance of experiment is being tested, as it is added only in one set of plant.

A manipulated variable is an independent variable whose amount can be changed during an experiment.

Here the fertilizer is a manipulated variable.

Question 2:

Because theory is the most organised statement proved by a set of independent experiments.

Explanation:

Hypothesis is the initial idea on which basis different experiments are conducted. But if 1 experiment succeeded and it supports the hypothesis, hypothesis do not become a theory.

For a theory, different experiments are necessary which supports that hypothesis.

Question no 4.

Density = 1.909 kg/m3

Explanation:

Given data:

Mass of the object = 42 kg

Volume of the object = 22 m3

Density of the object = ?

Solution

Density = mass/volume

Density =42/22 = 1.909

Density = 1.909 kg/m3

Hence the density of the object is 1.909 and its unit is kg/m3 which is system international unit of density.

Question 5.

Chlorine and water in swimming pool are mixed in such a way that there composition remains same throughout the mixture. And chlorine cannot be separated back from water. This is the homogeneous mixture.

Explanation: A homogeneous mixture is a mixture of more than one substance which are mixed together in such a way that they cannot be separated and the composition of the mixture remains same throughout the mixture. Example of homogeneous solution is sugar solution in water. As for swimming pool cleaning chlorine is added in pool water, it mixes in the whole water by diffusion. Hence it is a homogeneous mixture. Question no. 6.

Because physical change does not include composition change, it includes change in physical parameters. And in splicing tomato only change in shape is done.

Explanation: Chemical change means irreversible chemical composition change like the burning of toast. Physical change means reversible or irreversible change in shape, volume density without change in chemical composition. Splicing tomato comes under 2nd category because it does not include chemical change.

Remaining questions are attached in the files.

Physics
Step-by-step answer
P Answered by Specialist
Question no. 1:

Controlled experiment is an experiment which is designed to test a variable, which can be changed during the experiment.

Explanation:

Hence in this experiment, the importance of experiment is being tested, as it is added only in one set of plant.

A manipulated variable is an independent variable whose amount can be changed during an experiment.

Here the fertilizer is a manipulated variable.

Question 2:

Because theory is the most organised statement proved by a set of independent experiments.

Explanation:

Hypothesis is the initial idea on which basis different experiments are conducted. But if 1 experiment succeeded and it supports the hypothesis, hypothesis do not become a theory.

For a theory, different experiments are necessary which supports that hypothesis.

Question no 4.

Density = 1.909 kg/m3

Explanation:

Given data:

Mass of the object = 42 kg

Volume of the object = 22 m3

Density of the object = ?

Solution

Density = mass/volume

Density =42/22 = 1.909

Density = 1.909 kg/m3

Hence the density of the object is 1.909 and its unit is kg/m3 which is system international unit of density.

Question 5.

Chlorine and water in swimming pool are mixed in such a way that there composition remains same throughout the mixture. And chlorine cannot be separated back from water. This is the homogeneous mixture.

Explanation: A homogeneous mixture is a mixture of more than one substance which are mixed together in such a way that they cannot be separated and the composition of the mixture remains same throughout the mixture. Example of homogeneous solution is sugar solution in water. As for swimming pool cleaning chlorine is added in pool water, it mixes in the whole water by diffusion. Hence it is a homogeneous mixture. Question no. 6.

Because physical change does not include composition change, it includes change in physical parameters. And in splicing tomato only change in shape is done.

Explanation: Chemical change means irreversible chemical composition change like the burning of toast. Physical change means reversible or irreversible change in shape, volume density without change in chemical composition. Splicing tomato comes under 2nd category because it does not include chemical change.

Remaining questions are attached in the files.

Chemistry
Step-by-step answer
P Answered by Specialist
The weighted average atomic mass (m) of the newly discovered element X is the sum of the products of its isotopes percentage and mass.                    
m = (0.935) x (268.9 u) + (0.065) x (269.9 u) = 268.965 u
Thus, the weight of the atom is approximately 269.0 u.
Chemistry
Step-by-step answer
P Answered by Specialist
The weighted average atomic mass (m) of the newly discovered element X is the sum of the products of its isotopes percentage and mass.                    
m = (0.935) x (268.9 u) + (0.065) x (269.9 u) = 268.965 u
Thus, the weight of the atom is approximately 269.0 u.
Chemistry
Step-by-step answer
P Answered by PhD
Answer: chalcogens.
Explanation: Strontium is an alkaline earth metal, it always exhibits a degree of oxidation in its compounds +2.
Chalcogens are a group of 6 chemical elements (oxygen O, sulfur S, selenium se, tellurium te, polonium Po) that have an oxidation state of -2 => Chalcogens will combine with strontium in a ratio of 1:1.
Chemistry
Step-by-step answer
P Answered by Specialist
Answer: b. Fiona is correct because the diagram shows two individual simple machines.

Explanation:
A mechanical device using which we can change the direction or magnitude of force applied is known as simple machine.
For example, in the given diagram there are two individual simple machines.
The machine helps in changing the direction or magnitude of force applied by the man. As a result, it becomes easy for him to carry different things easily from one place to another.
Thus, we can conclude that the statement Fiona is correct because the diagram shows two individual simple machines, is correct.
Answer: b. Fiona is correct because the diagram shows two individual simple machines.

Explanation
Chemistry
Step-by-step answer
P Answered by PhD

Answer:

52.6 gram

Step-by-step explanation:

It is clear by the equation 2(27+3×35.5)= 267 gm of AlCl3 reacts with 6× 80 = 480 gm of Br2 . So 29.2 gm reacts = 480× 29.2/267= 52.6 gm

Chemistry
Step-by-step answer
P Answered by Master

Calcium (Ca)(On the periodic table, ionization energy increases as you go up and to the right of the periodic table)

Calcium (Ca)(On the periodic table, ionization energy increases as you go up and to the right of the

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