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:

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.


Related Questions

Write the chemical formula for the following: magnesium iodide

Answers

Answer:

Mgl2 is your answer. Can I get brainliest

Which of the following is an irreversible physical change?
a) melting a piece of lead
b) sharpening a pencil
c) dissolving sugar into water
d) boiling water

Answers

Answer:

b) sharpening a pencil

Explanation:

If you melt lead, boil water, or dissolve sugar in water, you can return all of them back to their original state. If you sharpen a pencil, you can't reattach the shavings as they were originally.

You may put all of them back to their original states by melting lead, heating water to a boil, or dissolving sugar in water. You cannot rejoin the shavings from a sharpened pencil in their original position. Thus, option B is correct.

What is irreversible physical change?

When something changes physically but not chemically, it has undergone an irreversible physical alteration that cannot be reversed.

Sharpening a pencil is a perfect example of an irreversible physical change. The wood turns to dust when you sharpen it. Just in a different shape, it is still wood. That wood dust cannot be transformed back into a pencil.

You cannot put a piece of paper back together the same way it was before you tore it if you tear it into tiny pieces.

An irreversible alteration is one that cannot be undone or that cannot be returned to its original state, such as when milk turns into curd, iron turns rusty, paper burns, food is cooked, etc.

Therefore, sharpening a pencil is an irreversible physical change

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Which of these is the standard force unit in the metric system? A) joule B) pound C) newton D) kilogram​

Answers

Answer:

C

Explanation:

Newton was the only force unit in the list

Through what process is heat transferred between the warmpair in front of a
fireplace and the cooler air on the other side of the room?
A. Radiation
B. Conduction
C. Convection
D. Absorption

Answers

Answer:

c-convection

Explanation:

i think it may help you and if its helpful plzz mark as brilliant

Convection this is when warm air and cold air are in a cycle

Plastic, rocks, rabbits and steel are all made of matter. Matter is made up of tiny particles called ________.
Question 1 options:

a nucleus

atoms

energy

molecules

Answers

Answer:

atoms should be the correct answer

Answer:

Matter is made up of tiny particles called atoms.

Explanation:

Atoms are made up of protons, neutrons and electrons. Atoms come together to form molecules which are building blocks for all types of matter.

Describe the difference between balanced forces and unbalanced forces.

Answers

Answer:

If two individual forces are of equal magnitude and opposite direction, then the forces are said to be balanced. An object is said to be acted upon by an unbalanced force only when there is an individual force that is not being balanced by a force of equal magnitude and in the opposite direction.

A runner completes a 400m race in 43.9s. What is his average speed?

Answers

Answer:

average speed around 9.1 meters/second

Explanation:

400 divided by 43.9

What is the relationship between the masses of protons and
electrons?

Answers

Answer:

Proton, stable subatomic particle that has a positive charge equal in magnitude to a unit of electron charge and a rest mass of 1.67262 × 10−27 kg, which is 1,836 times the mass of an electron.

Explanation:

IUPAC name for C3H7​

Answers

Answer:

propyl

Explanation:

......:)

..;) .........

How many moles are in 5.25 X 10 25
atoms of Au?

Answers

Answer:

The answer is 87.21 moles

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\ [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{5.25 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 87.2093023...[/tex]

We have the final answer as

87.21 moles

Hope this helps you

an endothermic animal is warm blooded. This means it can do what

Answers

Answer:

Endothermic animals are those that must generate their own heat to maintain an optimal body temperature.

Explanation:

Answer:

There

Explanation:

Endothermic animals are those that must generate their own heat to maintain an optimal body temperature. In ordinary language, these animals are commonly referred to as "warm-blooded." The term endotherm comes from the Greek endon, meaning within, and thermos, which means heat

Which 2 statements best describe the effects of ocean currents on weather?

A. Warm currents cause the air above them to take up less moisture than cold currents do.

B. Cold currents are cold because they absorb thermal energy from the air above them.

C. Warm currents warm the air above them.

D. Cold currents remove thermal energy from the air above them.

This is due today please help me!

Answers

Answer:

C and D

Explanation:

A is false because the warmer the current is, the more likely the moisture is to become airborne.

B is false because if the currents were absorbing thermal energy from the air above them, they would actually start to heat up rather than cool.

I THINKK ITS MAYBE C???

Is uranium a mixture or pure substance

Answers

Answer: is a pure substance

Explanation:

pure substance is the answer I think !!!!

*URGENT ILL RATE YOU BRAINLIEST ASWELL* What is the volume of a rectangular prism with a length of 10cm, width of 2cm and a height of 8 cm?
Remember: V = length x width x height

Answers

Answer:

160 cm

Explanation:

since you said that v=l x w x h

then you will only have to multiply all of them, 10cm x 2 cm x 8cm, and the answer is 160 cm

What’s science in science

Answers

Answer:

Science is the pursuit and application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence. Scientific methodology includes the following: Objective observation: Measurement and data (possibly although not necessarily using mathematics as a tool)

Explanation:

Answer:

Modern science is typically divided into three major branches that consist of the natural sciences (e.g., biology, chemistry, and physics), which study nature in the broadest sense; the social sciences (e.g., economics, psychology, and sociology), which study individuals and societies; and the formal sciences

6. Why does an atom have no net electric charge?
A. Its subatomic particles carry no electric charges.
B. The positively charged protons cancel out the
negatively charged neutrons.
C. The positively charged neutrons cancel out the
negatively charged electrons.
D. The positively charged protons cancel out the
negatively charged electrons.

Answers

Answer:

the positively protons cancel oit the negatively charged neutrons

Considering the definition of atom, the correct answer is option D. The positively charged protons cancel out the  negatively charged electrons.

The atoms that are present in all bodies are made up of electrons, protons, and neutrons. All three have mass, but only the electron and the proton have charge. The electron has a negative charge, and the proton has a positive charge.

Protons and neutrons reside together in the nucleus of the atom. The electrons are attracted to the protons of the  nucleus by the force that exists between particles with opposite electrical charge.

A neutral atom is one that lacks an electric charge due to a compensation between the number of its protons and electrons, that is, they have the same number of protons and electrons, since the total of positive charges of the protons cancels the total of charges. negative electrons.

Finally, the correct answer is option D. The positively charged protons cancel out the  negatively charged electrons.

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What components does the solar system appear to have formed from?

Answers

Answer:

I would say a dense cloud of interstellar gas and dust.

There are three laws of stratigraphy. They include the law of superposition, law of original horizontality, and law of cross-cutting relationships.

Question options:
True
False

Answers

false

//////////////////////////////

The heat required to raise the temperature of 12g of water from 16 C to 21 C is:
a) 60 J
b) 60 cal
c) 50 cal
d) 50 J

Answers

Answer:

The heat required to raise the temperature of 12g of water from 16 C to 21 C is 60 cal.

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

There is a direct proportional relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as on its mass, and is the product of the specific heat by the mass of the body. So, the equation that allows calculating heat exchanges is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Q=?c= 4.186 [tex]\frac{J}{g*C}[/tex]m= 12 gΔT=Tfinal - Tinitial= 21 °C - 16°C= 5 °C

Replacing:

Q= 4.186 [tex]\frac{J}{g*C}[/tex] *12 g *5 °C

Solving:

Q=251.16 J

Since 1 J is equal to 0.2388 cal, then the following rule of three can be applied: if 1 J is equal to 0.2388 cal, then 251.16 J to how many cal are?

[tex]cal=\frac{251.16 J * 0.2388 cal}{1 J}[/tex]

cal= 59.98 ≅ 60

The heat required to raise the temperature of 12g of water from 16 C to 21 C is 60 cal.

The calorimeter measures the transferred heat of the system. 60 cal is heat is required to raise the temperature of water from 16 to 21 degrees celsius.

What is heat?

Heat is the product of the mass, specific heat, and the change in the temperature of the system.

Heat exchanged by the system is calculated as:

[tex]\rm Q = \rm m c \Delta T[/tex]

Where,

Mass (m) = 12 g

Specific heat (c) = 4.186

Change in temperature = 5 degrees celsius

Substituting values in the equation:

[tex]\begin{aligned} \rm Q &= 12 \times 4.186 \times 5\\\\&= 251.16 \;\rm J\end{aligned}[/tex]

Converting joules into cal:

[tex]251.16 \times 0.2388 \;\rm cal = 60 \;\rm cal[/tex]

Therefore, the heat required is option b) 60 cal.

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1. Explain the relationship
between Polaris and Earth's tilt

Answers

Answer:

that it i think

Explanation:

the earth revolves around the Sun once each year and spins on its axis of rotation once each day. This axis of rotation is tilted 23.5 degrees relative to its plane of orbit around the Sun. The axis of rotation is pointed toward Polaris the North Star. As the Earth orbits the Sun the tilt of Earth’s axis stays lined up with the North Star.

Define cation and anion. In which case are electrons gained? Lost?

Answers

Explanation:

A cation is a positively charged ion.

An anion is a negatively charged ion.

In a cation, electrons are usually lostIn an anion, electrons are usually gained.

In an atom, the balance between the number of protons and electrons determine whether they become an anion or cation.

Protons are positively charged particles.

Electrons are negatively charged

 When an atom gains electrons, the number of electrons becomes more than that of protons. This leaves a net negative charge on the atom and it makes an anion.

 When an atom loses electrons, the number of protons becomes more than that of electrons. This leaves a net positive charge on the atom and makes a cation.

11. Which of the following best explains why CO2 gas is easily compressible but solid
CO2 (dry ice) is incompressible?
The molecules of CO2 gas are much closer together than
the molecules in dry ice.
The molecules of CO2 gas are much smaller than the molecules
of solid CO2
O
The molecules of solid CO2 are much closer together than
the molecules of CO2 gas.
The molecules of CO2 gas attract one another, while the
molecules of the solid CO2 repel one another.
0

Answers

Answer:

The right answer is C. The molecules of solid CO2 are much closer together than the molecules of CO2 gas.

The molecules of CO2 gas are much closer together than the molecules in dry ice. So CO2 gas is easily compressible but solid CO2 is incompressible. The correct option is A.

What is dry ice?

Carbon dioxide in its solid form is known as dry ice. Because CO2 does not have a liquid state at normal atmospheric pressure and sublimates directly from the solid to the gas state, it is commonly used for temporary refrigeration.

Dry ice can be a serious hazard in a small, poorly ventilated space. When dry ice melts, it emits carbon dioxide gas.

This gas can accumulate in a small space. A person can become unconscious and, in some cases, die if there is enough carbon dioxide gas present.

CO2 gas molecules are much closer together than dry ice molecules. As a result, CO2 gas is easily compressible, but solid CO2 is not.

Thus, the correct option is A.

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At which temperature would air hold the LEAST water vapor?

A. 13°C (55°F)

B. 35°C (95°F)

C. 24°C (75°F)

D. 2°C (36°F)

Answers

Answer:

2°C

Explanation:

The answer is D because cooler air holds less water vapor than warmer air, and 2°C is the coldest choice, so there's your answer!

At 2°C (36°F) temperature would air hold the LEAST water vapour. Hence, option D is correct.

What is temperature?

Temperature expresses hotness and coldness or a measure of the average kinetic energy of the atoms or molecules in the system.

At 2°C (36°F) temperature would air hold the LEAST water vapour because cooler air holds less water vapour than warmer air, and 2°C is the coldest choice.

Hence, option D is correct.

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What is a stable electron configuration?

Answers

They have two or eight electrons in their valence shell. They do not gain, lose or share electrons.

I’ll give the Brainliest, you also need to explain how the answer you got is correct.

Choose the best description of a neap tide.

A. Neap tides produce during the highest tides of the month.

B. Neap tides happen during winter and summer.

C. Neap tides could be described as low high tides and high low tides.

D. A neap tide is the period halfway between tides when the tide changes direction.

Thank you!

Answers

Answer:

D. A neap tide is the period halfway between tides when the tide changes direction. (correction) Answer : C

Explanation:

Process of elimination can be used. First off, A is incorrect because neap tides have the smallest tidal range ; spring tides would fit this choice. B is incorrect since neap tides are specific to the first, and third quarter moons when the sun and moon are right angles. C is wrong because it is the other way around since high tides are a little higher than average and low tides are a little lower than average (correction) this is correct since higher low tides and lower high tides are closer together and have a smaller tidal range than standard tides(spring tides) with higher high tides, and lower low tides. D is correct because they occur halfway between the spring tides (correction): incorrect since a neap tides occur around a week(7 days) after a spring tide(moderate tides). There is no evidence this is true.

There are three patterns: diurnal(one high and low tides a day), semidiurnal(two high and low tides a day), and mixed(two high and low tides a day of different lengths).

The spring and neap tides are the types of tides involved with the low and high tides.

what is potiential and kinetic engergy? pls someone answer my question

Answers

Answer:

Potential Energy is stored energy or energy of position (gravitational). The object isn't moving. For example, a ball being held is potential energy because the object isn't moving but it has the potential of turning into kinetic energy.

Kinetic Energy is the energy of motion. For example, running. You are moving, and there is clear action and activity

Energy stored in an object due to its position is Potiential energy . Energy that is moving object has due to its motion is Kinetic energy .

Which of the following happens to the particles when the temperature of liquid water drops?

Answers

Explanation:

when water is in liquid form and the temperature DROPS it becomes solid ice the process is melting , freezing and evaporation this goes in a circle

List 50 Laboratory Apparatus used in
CHEMISTRY​

Answers

1: safety goggles

2: beakers

3: test tubes

4: tongs

5: racks 6: watch glasses

7: crucible

8: funnels

9: graduated cylinder

10: volumetric flask

11: droppers 12: pipette

13: ring stand

14: rings

15: clamps

16: tongs

17: forceps

18: spatulas scoopulas

19: thermometer

20: Bunsen burner

21: balance

22: Florence flask

23: conical flask

HELPPP!!! It do now

Answers

Answer:

1) Darkness

2)Blocks

3)Eclipse

5)Solar Eclipse

6) Moon, Earth, Sun

7)Total

8)Partial

9)Moves

10)Umbra, Penumbra

In a sample of 400 lithium atoms, it is found that 30 atoms are lithium-6 (6.015 amu) and
370 atoms are lithium-7 (7.016 amu). What is the average atomic mass?

Answers

Answer:

667.3

Explanation:

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