CHEMISTRY HIGH SCHOOL

Imagine our class has discovered a new element and named it Berkmarium. Berkmarium is known to have 3 naturally occurring isotopes. In nature, 70% of the element is Berkmarium-95, 28% is Berkmarium-97, and 2% is Berkmarium-94. Which isotope will the average atomic mass of Berkmarum be closest to, and why? Support your answer with a calculation.

Answers

Answer 1

Answer:

Answer:

Detail is given below.

Explanation:

Given data;

Abundance of Berkmarium-95 = 70%

Abundance of Berkmarium-97 = 28%

Abundance of Berkmarium-94 = 2%

Average atomic mass closer to which isotope = ?

Solution:

1st of all we will calculate the average atomic mass of Berkmarium.

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100

Average atomic mass = (70×95)+(28×97)+(2×94) /100

Average atomic mass = 6650 + 2716+ 188 / 100

Average atomic mass= 9554 / 100

Average atomic mass = 95.54 amu

The average atomic mass is closer to the isotope Berkmarium-95 because it is present in abundance as compared to the other two isotope. So this isotope constitute most of the part of Berkmarium.

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What is the primary concern when implementing a solution?being creative
being specific being flexible
being authoritative

Answers

When implementing a solution to a problem, I think the primary concern should be being authoritative. By doing this, people will not slack and will not take advantage of the rules. People will also trust, respect and obey you.

Answer:

The correct answer is being authoritative.

Explanation:

Authoritative refers to permission to act without asking permission while being held responsible. While implementation refers to the conclusion of all the work in solving an issue and needs careful consideration to detail. There are three fundamental steps involved, that is, preparing and planning to implement the solution, implementing and observing the activity, and evaluating and studying the success of the action. Thus, in my opinion being authoritative would be a primary concern when implementing a solution.

During Mr. Nye's science class, students were expected to identify various substances using physical properties they could easily measure. Mr. Nye gave each of the five groups a green, metal cube and asked them to identify what the cube was made of. Matt's cube, after 5 trials, had an average density of 7.40 g/cm3 . His group's cube was made of A) aluminum. B) gold. C) nickel. D) zinc.

Answers

His group's cube was made of D) zinc. Looking up the density values of each of the choices, it can be seen that zinc has the closest density out of all of them. It's actual density has a value of 7.14 g/cm3. The others have density values that are way too far from the average density of 7.4 g/cm3.

Answer: D.) Zinc

Explanation:

Amines are derivatives of the ______ molecule.aldehyde
ammonia
acetone
nitric acid

Answers

Amines are derivatives of the ammonia molecule. Ammonia or azane is a compound of nitrogen and hydrogen, it is a colorless gas with a characteristic pungent smell.

Answer: ammonia

Explanation:- Functional groups are specific group of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules.

1. Aldydes have functional group $-O=C-H$ .

Example: Ethanal with molecular formula $CH_3CHO$

2. Amines have functional group $-NH_2$ .

Example: Methylamine with molecular formula $CH_3NH_2$ . they are formed by substituting one hydrogen of ammonia by a R substituent.

3. Ketones have functional group $-C=O$ .

Example: Acetone with molecular formula $CH_3COCH_3$

4. Nitric acid is a inorganic acid with molecular formula $HNO_3$ .

A solution is considered neutral if its pH is _________ 7.a. equal to
b. less than
c. greater than

Answers

When the solution has a ph equal to 7

Answer:

a, equal to

Explanation:

Which factors affect the flow of electric charge? Check all that apply.voltage
ampere
ohm
resistance
volt

Answers

the answers are voltage and resistance

Answer:

It is Voltage and Resistance

Explanation:

I got it correct on Edg2022 (picture above) ^^

A person pushes horizontally with a force of 220. N on a 56.0 kg crate to move it across a level floor. The coefficient of kinetic friction is 0.21. (a) What is the magnitude of the frictional force? (b) What is the magnitude of the crate's acceleration?