Help

what is isotopes

Answers

Answer 1
Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons.

Related Questions

What is x?





a
28
b
44
c
224
d
136

Answers

Answer:

Hope answer is right, d=136

Answers..,.ًًًًًًًًًًًًًًًًًًًًًًًًًًًًً………..,.,.,…,.,.,.,

Answers

Answer:

1) actual yield - 2.675 g

Theoretical yield - 4.0539 g

2)a) 41.257 g

b) 0.6857moles

c) 23 g

Explanation:

1)

Theoretical yield is the mass of the product that can obtain from the equation, it is not practical.

Theoretical yield:

Mr of SiO2 - 60

Moles of SiO2 - 2.339/60 = 0.03898 moles

Mr of SiF4 - 104

Mass of SiF4 - 0.03898 * 104 = 4.05392 g

2)

a)

mr of B2H6 - 28

Moles of B2H6 - 36.1/28 = 1.2893 moles

Mr of O2 - 32

Mass of O2 - 32 * 1.2893 = 41.257 g

b)

Moles of B2H6 - 19.2/28 = 0.6857 moles

Stoichiometry 1:1 ratio between B2H6 and H2O

So moles of H2O is 0.6857

c) moles of O2 - 2/24(r.t.p) = 0.083 moles

Mass of B2H6 - 0.083 * 28 = 2.3 g

One of the main properties used to describe a population

Answers

Answer:

Birth rate, death rate, emigration, immigration, or a census.

Explanation:

Help me please…………..d

Answers

This is a double replacement reaction

All atoms of an element are______.

Points: 87

Answers

Answer:

Alike

Explanation:

When you take a hot shower, the
a
shower curtain sometimes moves
into the shower towards you. Why
does this happen?

Answers

With hot water comes hot steam, it fills the shower area with steam which raises the air temperature and the air then rises out of the shower

Pls some one help
1 mark question

Answers

Answer:

See below

Explanation:

Helium belongs to group VIII of the periodic table "Noble gases". It has only 1 electronic shell and that too contains 2 electrons according to the accommodation of the shell. Hence, it's electronic shell is complete. This is the reason, Helium is chemically unreactive.

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

~AH1807

Which of the following is true for a nuclear reaction?
O Electrons are lost
Electrons are gained
O Identity of element changes
Oldentity of element remains same

Answers

Identity of element changes.

True statement for a nuclear reactions is that it changes the identity of the element.

What are nuclear reactions?

Nuclear reactions are those reactions in which changes in the nucleus of atoms take place in the form of fission and fussion.

As it is said that changes are taking place in nucleus so the electrons are not gained or lost in this reactions.Identity of the element changes as atomic number of element changes due to change in the number of protons.

Hence identity of element changes.

To know more about nuclear reactions, visit the below link:
https://brainly.com/question/984564

How many total atoms does 3Na2S2O3 have

Answers

Answer:

21

Explanation:

Let us count the number of individual atoms for Na2S2O3 (the compound name):

Na: 2

S: 2

O: 3

This brings us to a total of 7 atoms for one molecule of sodium thiosulfate. For three of these compounds, we get 3*7=21

What is the wavelength of the above wave?

Answers

Answer:

well what above wave?? do you have a picture

Explanation:

What do these red/yellow/orange-precipitate reactions have in common? (choose
the best answer)

They all made the same color.

They all have a barium (Ba+2) cation.

They all have a chromate (CrO4-2) ion.


They all have a chloride ( C1-1) ion.

Answers

Answer:

3 is the correct I think so

Answer:

They all have a chromate (CrO4-2) ion.

Explanation:

what is the magnitude of the acceleration that is produced when the brakes of a 2.4 x 10
cubed kg car apply a 3.2 x 10 cubed N force to stop the car

Answers

Answer:

b 1.3 m/s

Explanation:

newton's second law of motion

1. what property of gas does not change?

2. Name two gases besides oxygen found in Earth's atmosphere

Answers

Answer:

hydrogen and nitrogen or something?

Explanation:

Answer:

nitrogin and i forgot the other one srry!!

Explanation:

the boiling point of water at standard pressure is

Answers

Answer:

100 Celsius mostly because water boils at sea level

what is the difference between nitrite and nitrate​

Answers

Answer:

Nitrite:

Formula : NO₂⁻1 nitrogen molecule and two oxygen molecules with an excess electron.Angular shape

Nitrate:

Formula: NO₃⁻1 nitrogen molecule and three oxygen molecules with an excess electron.Trigonal planar structure.

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

~AH1807

what describes the pool of electrons in metallic bonding?

Answers

In metallic bonding, the electrons are “surrendered” to a common pool and become shared by all the atoms in the solid metal. Metallic bonding is found in metals and their alloys. When the atoms give up their valence electrons, they form ions. These ions are held together by the electron cloud surrounding them.

True/False: For the same system, heterogeneous nucleation will occur at less undercooling than homogeneous nucleation.

Answers

Answer:

True.Explanation:

same system, heterogeneous nucleation will occur at less undercooling than homogeneous nucleation.

pls some one help
1 mark question

Answers

Answer:

The atomic number of Chlorine(Cl) is 17 and the electronic configuration is 2,8,7 with seven electrons in the valence shell.

Hope that helps. x

Answer:

See below

Explanation:

Chlorine has 17 electrons in it's shell.

(See the attached file to get the idea of what subshell would be filled first).

The accommodations:

s = 2 electrons

p = 6 electrons

d = 10 electrons

f = 14 electrons

Now, the electronic configuration of chlorine:

1s²2s²2p⁶3s²3p⁵

(2+2+6+2+5 = 17 electrons)

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

~AH1807

How many molecules are in 10 grams of sulfur hexafluoride (SF6)? Molar Mass: 146.06 g/mol​

Answers

Answer: 4.123 x 10^22

Explanation:

The first step is to determine how many moles of sulfur hexafluoride (SF6) there are. To do this, you must take the mass of the SF6 (10g) and divide it by the molar mass (146.06).

[tex]10g * \frac{1 mol}{146.06 g}= 0.068465 mol[/tex]

Then you must use Avagadros number to find the number of molecules.

Avagadros number is the number of molecules in 1 mol of a substance, so a simple multiplication will do the trick.

[tex]0.068465mol * \frac{6.022 * 10^{23}}{1mol} = 4.123*10^{22}[/tex]

And that is your answer. There are 4.123 x 10^22 molecules of sulfur hexafluoride in 10g of it.

what are isotopes and explain why​

Answers

Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons. The number of protons in a nucleus determines the element's atomic number on the Periodic Table. For example, carbon has six protons and is atomic number 6.

A sample of gas occupies 20 mL at -109 degree C. What volume does the sample
occupy at 65 °C?

Answers

Answer: V2= 41.2mL

Explanation:

Givens:

* V1= 20ml

* T1 = -109 ⁰C --> K= ⁰C + 273.15 --> 164.15 K

* V2 = ??

* T2= 338.15 K

Use Charles law V1/T1 = V2/T2

Since we are looking for V2 we can rearrange the formula to

V2= (T2 x V1) /T1

V2= (338.15K x 20mL) / 164.15 K

V2= 41.2mL

NOTE:

Temperature should always be in K not in ⁰C or ⁰F

To convert from C to K use

*K= ⁰C + 273.15

Enter your C value in the ( ⁰C ) and you can get K

A 100 watt solar power panel usually costs $146 they are on sale for 0.75 of the regular price what is the sale price

Answers

Answer: $109.5
Multiply $146 (original price) by 0.75 (the percentage) and there’s your answer!

How to get rid of high cholesterol?!




Please tell me

Answers

you have to drink a lot of water and 67890

Explain how wind and water can create a sand dune along an ocean beach

Answers

Answer: A dune is a mound of sand formed by the wind, usually along the beach or in a desert.  Dunes can also be formed by strong currents beneath the water.

Which statement is correct about charges?
A.Opposite charges repel
B.Similar charges attract
C.Electrons are positively charged
D.Similar charges repel

Answers

Answer:

A.Opposite charges repel

[tex] \: \: \: \: [/tex]

D.Similar charges repel

correct me if I'm wrong

hope it helps

Which animal is found in the desert?

monkeys

parrots

buffalo

meerkats

Answers

Answer:

meerkats

Explanation:

Two protons and two neutrons are released as a result of this reaction. Superscript 222 subscript 86. Rn Right arrow superscript 218 subscript 84. Po ? Which particle is released? one alpha particle two beta particles one alpha and one beta particle one high-energy photon.

Answers

The particle released in the reaction has been an alpha particle. Thus, option A is correct.

The release of protons and neutrons in a reaction has been nuclear reactions. The reactions results in the change in the atomic mass of the atom, with the formation of new atom. The extra mass has been released in the form of energy.

The release from the given reaction has been:

[tex]\rm ^{222}_{66}Rn\;\rightarrow\;^{218}_{84}Po\;+\;^A_ZX[/tex]

Where, X has been the particles that has been released with the nuclear reaction. The superscript A has been the Mass of particle, and subscript Z has been the atomic number.

According to the law of conservation, the mass has been constant on both the product and the reactant side. Thus, the mass and atomic number of eliminated particles has been given as:

[tex]\rm 222=218+A\\A=222-218\\A=4[/tex]

The atomic mass of the particle has been 4.

[tex]\rm 86=84+Z\\Z=86-84\\Z=2[/tex]

The atomic number of the particle has been 2.

The element with atomic mass 4, and atomic number 2 has been the Helium particles, [tex]\rm ^4_2He[/tex]. It has been an alpha particle. Thus, the particle released in the reaction has been an alpha particle. Thus, option A is correct.

For more information about the particles released, refer to the link:

https://brainly.com/question/2600896

Answer:

A

Explanation:

How do characteristic properties help you determine whether a chemical
change or a physical change has occurred? I

Answers

Answer: The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.

Explanation:

A horticulturalist wants to produce geraniums with specific characteristics.

She knows that the trait of red flowers is governed by the allele R (RR and Rr) and the trait of white flowers is governed by the allele r(rr).

The horticulturalist crosses two geraniums from the F1 generation.

Look at the Punnett square to see this cross.

R r
R RR Rr
r Rr rr


Which ratio of red-to-white flowering plants would she expect to see in the phenotypes of the F2 generation?

all red

3 red : 1 white

1 red : 3 white

2 red : 2 white

Answers

Yo,

In Geranium plant life red vegetation is given by using the allele R this is dominant (so RR or Rr ) genotype will produce crimson plant life.

If we communicate approximately the connected punnet square which i took from the workout e book, you could see that there was a cross made among vegetation with heterozygous genotype for red flora.

P1: Rr X Rr

Gametes: R: r : R : r

F1: RR: Rr: Rr: rr

so there is three: 1 in F1 offspring for red to white plant life.

Now the query is set f2 technology, while we cross F1 generation suppose we do a move of Rr and rr from F1 generations allow us to see what takes place.

F1: Rr: rr

Gametes: R: r: r: R

F2 : Rr : rr: Rr: rr

Rr: purple flowers

rr: White flora:

So the ratio in F2 era might be 2 crimson : 2 white. Please see connected punnet squares (first one for query) and the second of F1 move for better know-how.

I'm hoping that this will benefit you, so from my assumption and study it'd be 2 crimson : 2 white, if this is indeed the one i'm thinking of since nothing else was provided, if not please correct me.

Answer: 2 red : 2 white

Explanation:

I know

How many molecules are in 1.3 moles of water?​

Answers

Answer:

7.8286e+23

Explanation:

Use Avogadro's number

Other Questions
(-4+2)(-5+3)/-3 please help The house un-american activities committee targeted brainly. Divide 120ml into the ratio 3:7 Lee el dilogo y escoge la opcin que tiene los nmeros correctos de la conversacin. Read the dialogue and select the option that has the correct numbers from the conversation.Buenas tardes, Marta. Cul es tu nmero de telfono?Mi nmero de telfono es cero nueve, diecinueve, veinticinco, catorce, treinta. 19 29 15 14 13 29 19 25 04 30 09 29 15 14 13 09 19 25 14 30***Please Answer Quick (Filipino sub) Nagbibigay aliw ito sa maraming kaparaanan maliban sa, a. Katatawananb. Pang-aasarc. Pag-aawayd. ramatikong paglalahad which of the following trade policy How do you round 104,000 to the nearest 100,000 Help me pls :D Make the equations match with the number The Declaration of Rights and Sentiments demanded __________. A. equal rights for women B. a lower voting age C. voting rights for African Americans D. voting rights for District of Columbia citizens Why do sex-linked traits follow different patterns of inheritance than other traits ? A. Females only have one X chromosome . B. Males only have one X chromosome .C. Males only carry recessive alleles . D. Females only carry dominant alleles . Who can write me a compare and contrast essay on two movies The following quote refers to which of the following statements?Because man and woman are the complement of one another, we need woman's thought in national affairs to make a safe and stable government. Elizabeth Cady Stantona. The different roles of men and women complement each other.b. When women think about national affairs, a safe and stable government will be present.c. Womens vote is needed to complement mens vote.d. Womens vote will add an important ingredient to mens vote in establishing a balanced and secured government structure. what is greater -5 1/2 or -6.5 Emily decides to write about the various shopping experiences in Chile on her Spanish-language blog. She wants to describe the different shopping environments, stores, and the gift she bought for her cousin. Write the blog entry, in Spanish, from Emilys perspective. Two billiard balls having the same mass and speed roll directly toward each other. What is their combined momentum after they meet A triangle can have a maximum of how many non-acute angles? Mrs phillubum has $200 in her bank account and is saving at a rate of $25 each week. .Now it is your turn to demonstrate what you learned about multimodal media and create your own piece. Here aresome requirements for your multimodal media piece:Media piece demonstrates main idea that relates to a current eventMedia piece demonstrates purpose and intended effect on the audienceMedia piece demonstrates use of factual or opinionated content effectively to get message across toaudienceMedia piece includes the use of at least three types of multimodal contentMedia piece uses effective, compelling language: language and word choice are taken into consideration,especially with the use of specific supporting details to make the message interestingMedia piece uses correct spelling, mechanics, and punctuation Which type of diets should be prescribed by the dietician to your cousin who is suffering from diabetes and kidney problem respectivelya. Low fibre and High protein dietb. Low fibre and low fluid dietc. High fibre and regular dietd. High fibre and low protein dietchoose the crrct answer....pls answer.... : ) why do atheists not believe in the sanctity of life.