Chemistry High School

Please can I have help on question e as I’m really stuck.I promise I’ll give out brainiest

Answers

Answer 1

The relative atomic mass of element A : 6.075 u

Further explanation

The elements in nature have several types of isotopes

Isotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.

So Isotopes are elements that have the same Atomic Number (Proton)

Atomic mass is the average atomic mass of all its isotopes

Mass atom X = mass isotope 1 . % + mass isotope 2.% ...

Element A

mass number of isotope 1 = 6 , percent : 92.5%

mass number of isotope 2 = 7, percent : 7.5

Relative atomic mass of element A

[tex]\tt = 92.5\%\times 6+7.5\%\times 7\\\\=5.55+0.525=6.075~u[/tex]

Related Questions

A does not change the substance into anything new

Answers

Answer:

Physical changes only change the appearance of a substance, not

chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

Explanation:

How did Thomson's experiment change Dalton's atomic model?
A. Thomson discovered that atoms changed properties when put in
an electric field.
B. Thomson discovered that atoms did not rearrange when forming
compounds.
C. Thomson discovered that atoms of one kind of element could
have different masses.
D. Thomson discovered that the atom contained smaller particles
called electrons.

Answers

Answer:

D. thomson discovered that the atom contains smaller particles called electrons

Thomson discovered that the atom contained smaller particles called electrons. The correct option is D.

What is Dalton's atomic model?

Dalton proposed that all matter is composed of tiny indivisible particles known as atoms, which he envisioned as "solid, massy, hard, impenetrable, movable particle(s)."

Thomson's experiment altered Dalton's atomic model by revealing the existence of smaller particles known as electrons within the atom.

The first part of his theory states that all matter is made up of indivisible atoms. According to the second part of the theory, all atoms of a given element have the same mass and properties.

One of Dalton's most important contributions is that it does not violate several fundamental laws of chemical combination, including the law of definite proportions, the law of multiple proportions, and the law of conservation of mass.

Thus, the correct option is D.

For more details regarding Dalton's atomic model, visit:

https://brainly.com/question/12766754

#SPJ2

Cone shaped mountains form as a result of which one of these events?

Answers

Answer:

Volcanic Eruptions

Explanation:

It says in the question

they are a form of volcanic eruptions

A mixture is made of two or more materials that
A. can be separated by physical means.
В.
cannot be separated by physical means.
C.
cannot be separated by any means.
D
can only be separated by chemical means.

Answers

Answer:

A. can be separated by physical means.

Explanation:

A mixture is when two different materials are put in the same container and no reaction occurs.

Two examples of silicate minerals are

Answers

Answer:

who know

Explanation:

look it up on google that’s how i get my answers :)

Which types of matter are made of atoms

a. Mixtures
b. Elements
C. Compounds
D. All of the above

Answers

Answer:

D all above yes I think it's all above

Answer: D

Explanation: All of the above.

Plz mark brainliest:)

The
force acting on an object is the combination of
all of the individual forces acting on it.
Check it
2 SCRATCHPAD
~ Improve this questio

Answers

Answer:

Yes as you can improve The invisible to human eye force or physical force if any being applied to a object of any mass and with all individual forces as they are acting on this object

Explanation:

when heat is added to a substance describe how the molecules are affected?

Answers

Answer:

the molecules and atoms start to vibrate faster so basically the object starts to expand because the space between atoms increases :)

compound name of SO2

Answers

The compound name is SO2 is Sulfur dioxide. I hope this helps!!

i dont get what it means by of touch

Answers

Answer:

So I don't know what do you mean by that, please be a little specific.

Explanation:

How did John Newlands order the elements?

Answers

Hello friend! Hopefully this helps you as much as needed!

An English scientist called John Newlands put forward his Law of Octaves in 1864. He arranged all the elements known at the time into a table in order of relative atomic mass. He then put the similar elements into vertical columns, known as groups.

Gamma
ray
Which has the longest wavelength?
Ultra-
violet Infrared
Radio
Which has the highest frequency?
X-rays Visible
Microwave
WWW

Answers

Answer:

Radio waves

X-rays Visible

Explanation:

The wavelength of a wave is the difference between successive crests on a wave line. Waves with a very high wavelength have low energy.

Frequency is the number of waves that pass a point per unit of time. The higher the frequency, the higher a wave's energy.

From the given spectrum, wavelength increases from left to right. This puts radio waves as the wave with the longest wavelength. It is also right to say, it has the least energy. Also, frequency decrease from left to right. Gamma rays have the highest frequency in the spectrum. This is followed by x-rays.

Answer:

Radio waves

X-rays Visible

Explanation:

Scott and James work at a grocery store. After the grocery
store closed, they were playing a game with a shopping cart
and Scott's skateboard. They crashed the skateboard and
the shopping cart two times. The shopping cart had more non

Answers

Answer: b) Crash 2; the force on the cart was stronger in this crash, so the force on the skateboard was also stronger.

Explanation:

Which description applies to a physical property? Choose the correct answer
O depends directly on the amount of the substance present
O examines changes in the composition and structure of matter
O measured or observed without changing the identity and composition of matter
O determined by changing the identity of a substance and observing how it reacts

Answers

Answer:

the third one, measured or observed without changing the identity and composition of matter. because physical property does not under go any change but can be put back.

What is the purpose of the title of a line graph

Answers

Answer:

It tells about the data for each line graph is plotted.

Explanation:

Answer:

It can describe what the line graph is measuring and how it is measuring it

true or false there is a risk of explosion in factories handling powders such as custard powder

Answers

Answer:

True? I think so At least

Explanation:

What is the most common isotope of lithium?

Answers

Lithium-7 is the most common isotope of lithium.

why people on earth cannot see the entire shape of the milky way

Answers

Answer:

Explanation:

That is because the Milkyway is full of dust and gas, you cannot really see something if it has dust and gas

Answer:

Its too far away to see

Explanation:

You would probably have to be in space

Which of the following wave types must have a medium to travel?
A. Ultraviolet light
B. Microwaves
C. Seismic (earthquake) waves
D. Radio waves
E. X rays

Answers

Answer:

it is B

Explanation:

Answer: B microwaves

A student combines two clear liquid chemicals together in a beaker. When the two chemicals are combined, bubbles are formed, the solution turns blue, and you can see flakes of something forming on the bottom of the beaker. Is this a physical or chemical change? Why?

Answers

Answer:

chemical change

Explanation:

A physical change is one that makes changes to the physical properties of matter. In many cases, the difference is usually reversible. Examples include boiling, melting, freezing, the magnetization of metals, etc.

A chemical change is one in which a new kind of matter is formed. It is usually accompanied by energy changes, i.e., the evolution or absorption of energy in the form of heat or light. This process is not easily reversible. Examples include; combustion, rusting of iron, precipitation, the souring of milk, etc.

From the question given, the combination of two clear liquid in a beaker which results to formation of bubbles and changes in coloration of the solution is a chemical change.

where is lithium used in the body?

Answers

Answer:

Explanation:

1. Matter that is composed of two or more different
elements chemically combined in a fixed proportion
is classified as
A) a compound
C) a mixture
B) an isotope
D) a solution

Answers

It’s A: a compound I hope u doing well on ur hw

Find an element that has the same
number of valence electrons as
Thallium (T1).
i need the answer nowww

Answers

Answer:sodium

Explanation: because its not hard to look on the PERIODIC TABLE

Brainliest please helppppppppp

Answers

Ayour anwerser

Explanation

Answer:

chlorine manoxside

co2

Explanation:

A student states that photosynthesis is conducted only in plant cells and that cellular respiration occurs only in animal cells. Tell whether the student is correct and why. In your response, be sure to describe both processes and the structures involved. Upload your answer below.

Answers

Answer:

This is correct

Explanation:

This is correct because for photosynthesis you need organelles such as chloroplasts, chloroplasts absorb light energy and convert it into usable energy for plants. Animal cells do not have chloroplasts/similar organelles so they can't absorb energy from the sun, Animal cells use mitochondria which takes energy from our food and breaks it down into usable energy(such as ATP) to be transported.

Help ASAP plzzzz!!!!!!!!

Answers

Answer:

Granite Solid

Milk Liquid

Neon is gas

Wood Is solid

Paper is solid

Helium is Gas

Water is liquid

Air is Gas

Alcohol is liquid

Metal is solid

Nitrogen is gas

Juice is liquid

Oil is liquid

Water Vapor is Gas

Brick is Solid

Propane is Gas

Fabric is solid

Gasoline is Liquid

Explanation:

Hope Dis helped :D :3

I agree with the person above, me you can search those up or look on the periodic table for some of them because metals are to the left and non-metals are to the right.

A student compared some chemical and physical properties of three pure substances. Her
data are recorded in the chart above. What is a logical conclusion the student can draw
about hare substances?
Pure substances have the same chemical and physical properties.
Pure substances have the same chemical properties, but different physical properties.
O Pure substances have the different chemical properties, but the same physical properties.
O Pure substances have different chemical and physical properties.

Answers

Answer:

letter b not c

Explanation:

next time please take a picture lucky i already took this

What is hydrochloride acid plus water plus salt and water

Answers

ANSWER:

It is called Caffeine Hydrochloride.
Formula: HC8H10N4O2Cl

how can prey benefit from the predator having a disease?

Answers

The disease can slow the predator down and the prey can get away easily.

Convert 122 moles of Methane to liters?

Answers

122 moles of Methane to liters is 2734.5

Other Questions

A few boats were traveling upstream and downstream. A satellite recorded the movements of several boats. A motor boat traveled -3.4 miles for every hour in 0.75 hours. How much progress? why we should elevated bed to waist level during bed making A 20 gallon tank is 3/4 full. How many gallons are in the tank? is this a function or not channged all sentences to passivesomebody should have cleaned the room. A student is helping his neighbor move a new dishwasher into their house. The house has three steps on the front porch that cause the porch to be 2 meters above the ground. Which method requires the least amount of force to get the dishwasher from the ground to the porch? ogan Products computes its predetermined overhead rate annually on the basis of direct labor-hours. At the beginning of the year, it estimated that 40,000 direct labor-hours would be required for the period's estimated level of production. The company also estimated $466,000 of fixed manufacturing overhead expenses for the coming period and variable manufacturing overhead of $3.00 per direct labor-hour. Logan's actual manufacturing overhead for the year was $713,400 and its actual total direct labor was 41,000 hours.Required:Compute the company's pre-determined overhead rate for the year. What is the Kc equilibrium-constant expression for the following equilibrium? S8(s) + 24F2(g) 8SF6(g) Solve for x for the following pls!1) 7+3x+1=4x+52) 8+2x+18=x+193) 6+2x+13=x+26would appreciate it sm Which two of the following Religions influenced the founding of government?are What energy transformation takes place when you stretch a bungee cord? I need help plzzz this is for today please help sum_even Write a program that reads an integer 0 < n < 2^32, returns the sum of all digits in n that are divisible by 2. For example, if n = 341238 the output would be 14, because it is the sum of 4 + 2 + 8. Hint: a signed int may not be enough. what happened as a result of the second great awakening What is the slope of the line y-5=3(x-2)? write an equation of line parallel to the line y=2/5x+10 and passes through the point 10/11 What is the medical term used for a respiratory rate below normal? If any of you are willing to do this, I will give you the brainiest, and +20. * Before you read:During the time this story takes place, India was a British colony. The colonial official works for the British government in India. The government attachs work for another countrys embassy in India. Finally, a naturalist is someone who studies animals and plants.The country is India. A colonial official and his wife are giving a large dinner party. They are seated with their guests army officers, and government attachs with their wives, and a visiting American naturalist in their spacious dining room. It has a bare marble floor, open rafters, and wide glass doors opening onto a veranda.A spirited discussion springs up between a young girl who insists that women have outgrown the jumping-on-a-chair-at-the-sight-of-a-mouse era and a colonel who says that they havent.A womans unfailing reaction in any crisis, the colonel says, is to scream. And while a man may feel like it, he has that ounce more of nerve control than a woman has. And that last ounce more is what counts.The American does not join in the argument but watches the other guests. As he looks, he sees a strange expression come over the face of the hostess. She is staring straight ahead, her muscles contracting slightly. With a slight gesture, she summons the native boy standing behind her chair and whispers to him. The boys eyes widen, and he quickly leaves the room.Of the guests, none except the American notices this or sees the boy place a bowl of milk on the veranda just outside the open doors.The American comes to with a start. In India, milk in a bowl means only one thingbait for a snake. He realizes there must be a cobra in the room. He looks up at the rafters the likeliest place but they are bare. Three corners of the room are empty, and in the fourth the servants are waiting to serve the next course. There is only one place left under the table.His first impulse is to jump back and warn the others, but he knows the commotion would frighten the cobra into striking. He speaks quickly, the tone of his voice so arresting that it sobers everyone.I want to know just what control everyone at this table has. I will count to three hundred thats five minutes and not one of you is to move a muscle. Those who move will forfeit fifty rupees. Ready!The twenty people sit like stone images while he counts. He is saying two hundred and eighty when, out of the corner of his eye, he sees the cobra emerge and make for the bowl of milk. Screams ring out as he jumps to slam the veranda doors safely shut.You were right, Colonel! the host exclaims. A man has just shown us an example of perfect control.Just a minute, the American says, turning to his hostess. Mrs.Wynnes, how did you know the cobra was in the room?A faint smile lights up the womans face as she replies. Because it was crawling across my foot."The Dinner Party by Mona Gardner, 1942, 1970 by SATURDAY REVIEWColor Code the Story above based on the Five Parts of Plot.Exposition: (Intro to Characters, Setting and Possible Problem)Rising Action: (Summarize all events building to the climax.)Climax: (The most exciting part! Its also the turning point.)Falling Action: (Character & reader questions begin to be answered.)Resolution: (Loose ends are tied up. "...happily ever after. The end.") Il y avait dj bien des annes que, de Combray, tout ce qui ntait pas le thtre et le drame de mon coucher nexistait plus pour moi, quand un jour dhiver, comme je rentrais la maison, ma mre, voyant que javais froid, me proposa de me faire prendre, contre mon habitude, un peu de th. Je refusai dabord et, je ne sais pourquoi, me ravisai. Elle envoya chercher un de ces gteaux courts et dodus appels Petites Madeleines qui semblaient avoir t moules dans la valve rainure dune coquille de Saint-Jacques. Et bientt, machinalement, accabl par la morne journe et la perspective dun triste lendemain, je portai mes lvres une cuillere du th o javais laiss samollir un morceau de madeleine. Mais linstant mme o la gorge mle des miettes du gteau toucha mon palais, je tressaillis, attentif ce qui se passait dextraordinaire en moi. Un plaisir dlicieux mavait envahi, isol, sans la notion de sa cause. Il mavait aussitt rendu les vicissitudes de la vie indiffrentes, ses dsastres inoffensifs, sa brivet illusoire, de la mme faon quopre lamour, en me remplissant dune essence prcieuse: ou plutt cette essence ntait pas en moi, elle tait moi. Javais cess de me sentir mdiocre, contingent, mortel. Do avait pu me venir cette puissante joie ? Je sentais quelle tait lie au got du th et du gteau, mais quelle le dpassait infiniment, ne devait pas tre de mme nature. Do venait-elle ? Que signifiait-elle ? O lapprhender ? Je bois une seconde gorge o je ne trouve rien de plus que dans la premire, une troisime qui mapporte un peu moins que la seconde. Il est temps que je marrte, la vertu du breuvage semble diminuer. Il est clair que la vrit que je cherche nest pas en lui, mais en moi. Il ly a veille, mais ne la connat pas, et ne peut que rpter indfiniment, avec de moins en moins de force, ce mme tmoignage que je ne sais pas interprter et que je veux au moins pouvoir lui redemander et retrouver intact, ma disposition, tout lheure, pour un claircissement dcisif. Je pose la tasse et me tourne vers mon esprit. Cest lui de trouver la vrit. Mais comment ? Grave incertitude, toutes les fois que lesprit se sent dpass par lui-mme ; quand lui, le chercheur, est tout ensemble le pays obscur o il doit chercher et o tout son bagage ne lui sera de rien. Chercher ? pas seulement : crer. Il est en face de quelque chose qui nest pas encore et que seul il peut raliser, puis faire entrer dans sa lumire. Proust - Du cot de chez Swann - A la recherche du temps perduQuestions : 1. Expliquez les mots difficiles2. Trouvez le mouvement du texte. (les trois parties du texte).3. Etudiez lutilisation des temps employs ? 4. Trouvez les mtaphores dans cet extrait et cherchez leurs effets. Which of the following is a common contributing factor to depression in a young adult?Being denied health insuranceToo many societal expectationsUnplanned pregnancyPTSD