How many moles are in 12.6 grams of K2S?

Answers

Answer 1
0.11427369093138474 that’s what I got

Related Questions

Michelle learns in science class that simple machines such as an inclined plane can change the amount of force needed to lift heavy objects. She decides to test this with an experiment.



Michelle chooses a 10 kg weight. She sets up a ramp made of smooth metal that makes an angle θ with the floor. She attaches a spring scale to the weight and the top of the ramp in order to hold the weight in place. She records the force from the spring scale, then changes θ and records it again. She repeats this several times.


In this experiment, what is the dependent variable?

A.

the mass of the weight

B.

the angle θ between the ramp and the ground

C.

the amount of force on the spring scale

D.

the material the ramp is made of
Be fast please

Answers

I think it may be c I’m sorry if it’s wrong

Which of the following best describes how Thomson
concluded that electrons are present in all atoms.
a
The charge-to-mass ratio of electrons is always the
same constant, no matter which substances are
used in the cathode ray tube.
b The cathode ray was able to turn a wheel.
The cathode ray always bent toward a negatively
charged plate.
d
The charge-to-mass ratio is unique to each different
element.

Answers

Answer: A

Explanation:

The charge-to-mass ratio of electrons is always the same constant, no matter which substances are used in the cathode ray tube.

Explanation:

Thomson in his model of atom discussed that the atom consists of a negative charge particle termed electron randomly distributed in the positively charged sphere to balance the negative charge.His model of the atom was also known as the Plum pudding model of the atom. In which electrons are embedded in positive soup.He discovered electrons by conducting an experiment with cathode rays in which cathode rays emerging from the cathode were observed to be deflected towards the positively charged plate.He also conducted the same experiment with different metals (for anode and cathode) and gases and found out that the charge to mass ratio of the electron was regardless of the metals or gases used in the experiment.With this, he landed on the conclusion that these particles of cathode rays are the universal component of matter.

So, from this, we can conclude that the charge-to-mass ratio of electrons is always the same constant, no matter which substances are used in the cathode ray tube describes Thomson's conclusion that electrons are present in all atoms.

Learn more about J.J. Thomson's model of atom here:

brainly.com/question/2437167?referrer=searchResults

brainly.com/question/1874920?referrer=searchResults

If an object has a mass of 180 g and a density of 6 g/cm^3, what is the volume of the object?

Answers

Answer:

The answer is 30 cm³

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\[/tex]

From the question

mass = 180 g

density = 6 g/cm³

We have

[tex]volume = \frac{180}{6} \\ [/tex]

We have the final answer as

30 cm³

Hope this helps you

what is the identity of the element that produced the unknown emission spectrum

Answers

Answer:

The emitted light can be observed as a series of colored lines with dark spaces in between; this series of colored lines is called a line or atomic spectra.

Explanation:

The density of ice is 0.92 g/cm3 and the density of rubbing alcohol is 0.80 g/cm3. If an ice cube is placed in a container of rubbing alcohol, the ice cube will
Question 7 options:

a) float in the rubbing alcohol with none of the ice cube submerged.

b) sink to the bottom of the container.

c) move up and down in the rubbing alcohol.

d) float in the alcohol so that most of the ice cube is below the surface of the liquid.

Answers

Answer:

Option B. Sink to the bottom of the container.

Explanation:

From the question given above, the following data were obtained:

Density of ice = 0.92 g/cm³

Density of rubbing alcohol = 0.80 g/cm³

From the density of both substance given, we can see clearly that the ice has a higher density when compared with the rubbing alcohol.

Thus, If an ice cube is placed in a container of rubbing alcohol, the ice cube will not float rather, it will sink to the bottom of the container because the ice has a higher density than the rubbing alcohol.

How is a substance’s solubility in another substance determined?
A. Add solvent till no more will dissolve
B. Add solvent stepwise till no more will dissolve
C. Add solute until no more will dissolve in a fixed amount of solvent
D. Cool the solvent

Answers

Answer:

b

Explanation:

now explanation because that is answer

1. The ability to dissolve in water and to conduct
electricity are examples of
a. physical properties.
b. chemical changes.
c. chemical properties.
d. chemical bonding.

Answers

Answer:

Physical

Explanation:

Because thats the answer

What is ionization energy?

Answers

The minimum amount of energy required to move most loosely bound electron of a isolated neutral gas atom or molecule

Why are the coefficients before a chemical symbol important?​F. ​ They show the number of elements in each molecule.​G. ​ They indicate the number of molecules of each substance.​H. ​ They describe the number of times each molecule reacts.​J. ​ They explain the order in which the reaction takes place

Answers

Answer:They indicate the number of molecules of each substance

Explanation:

When we write chemical reaction equations, we usually put a number before the symbol of each reactant.

These coefficient shows the number of molecules of that specie that is involved in the balanced reaction equation for the reaction.

These coefficients are important because they are used in carrying out stoichiometric calculations.

What is the name of this ionic compound (Fr2SO4)

Answers

Answer:

3.5: Ionic Compounds- Formulas and Names

Last updatedAug 25, 2020

3.4: An Atomic-Level Perspective of Elements and Compounds

 

3.6: Molecular Compounds- Formulas and Names

picture_as_pdf

Readability

Donate

6.9: Binary Ionic Compounds and Their Properties

6.18: Ionic Compounds Containing Polyatomic Ions

Learning Objectives

Derive names for common types of inorganic compounds using a systematic approach

Nomenclature, a collection of rules for naming things, is important in science and in many other situations. This module describes an approach that is used to name simple ionic and molecular compounds, such as NaCl, CaCO3, and N2O4. The simplest of these are binary compounds, those containing only two elements, but we will also consider how to name ionic compounds containing polyatomic ions, and one specific, very important class of compounds known as acids (subsequent chapters in this text will focus on these compounds in great detail). We will limit our attention here to inorganic compounds, compounds that are composed principally of elements other than carbon, and will follow the nomenclature guidelines proposed by IUPAC. The rules for organic compounds, in which carbon is the principle element, will be treated in a later chapter on organic chemistry.

Ionic Compounds

To name an inorganic compound, we need to consider the answers to several questions. First, is the compound ionic or molecular? If the compound is ionic, does the metal form ions of only one type (fixed charge) or more than one type (variable charge)? Are the ions monatomic or polyatomic? If the compound is molecular, does it contain hydrogen? If so, does it also contain oxygen? From the answers we derive, we place the compound in an appropriate category and then name it accordingly.

Compounds Containing Only Monatomic Ions

The name of a binary compound containing monatomic ions consists of the name of the cation (the name of the metal) followed by the name of the anion (the name of the nonmetallic element with its ending replaced by the suffix –ide). Some examples are given in Table  3.5.2 .

Table  3.5.1 : Names of Some Ionic Compounds

NaCl, sodium chloride Na2O, sodium oxide

KBr, potassium bromide CdS, cadmium sulfide

CaI2, calcium iodide Mg3N2, magnesium nitride

CsF, cesium fluoride Ca3P2, calcium phosphide

LiCl, lithium chloride Al4C3, aluminum carbide

Compounds Containing Polyatomic Ions

Compounds containing polyatomic ions are named similarly to those containing only monatomic ions, except there is no need to change to an –ide ending, since the suffix is already present in the name of the anion. Examples are shown in Table  3.5.2 .

Table  3.5.2 : Names of Some Polyatomic Ionic Compounds

KC2H3O2, potassium acetate (NH4)Cl, ammonium chloride

NaHCO3, sodium bicarbonate CaSO4, calcium sulfate

Al2(CO3)3, aluminum carbonate Mg3(PO4)2, magnesium phosphate

Ionic Compounds in Your Cabinets

Ionic Compound Use

NaCl, sodium chloride ordinary table salt

KI, potassium iodide added to “iodized” salt for thyroid health

NaF, sodium fluoride ingredient in toothpaste

NaHCO3, sodium bicarbonate baking soda; used in cooking (and as antacid)

Na2CO3, sodium carbonate washing soda; used in cleaning agents

NaOCl, sodium hypochlorite active ingredient in household bleach

CaCO3 calcium carbonate ingredient in antacids

Mg(OH)2, magnesium hydroxide ingredient in antacids

Al(OH)3, aluminum hydroxide ingredient in antacids

NaOH, sodium hydroxide lye; used as drain cleaner

K3PO4, potassium phosphate food additive (many purposes)

MgSO4, magnesium sulfate added to purified water

Na2HPO4, sodium hydrogen phosphate anti-caking agent; used in powdered products

Na2SO3, sodium sulfite preservative

Table  3.5.3 : Names of Some Transition Metal Ionic Compounds

Transition Metal Ionic Compound Name

FeCl3 iron(III) chloride

Hg2O mercury(I) oxide

HgO mercury(II) oxide

Cu3(PO4)2 copper(II) phosphate

Naming Ionic Compounds

Name the following ionic compounds, which contain a metal that can have more than one ionic charge:

Fe2S3

CuSe

GaN

CrCl3

Ti2(SO4)3

Solution

The anions in these compounds have a fixed negative charge (S2−, Se2− , N3−, Cl−, and  SO2−4 ), and the compounds must be neutral. Because the total number of positive charges in each compound must equal the total number of negative charges, the positive ions must be Fe3+, Cu2+, Ga3+, Cr4+, and Ti3+. These charges are used in the names of the metal ions:

iron(III) sulfide

copper(II) selenide

gallium(III) nitride

chromium(III) chloride

titanium(III) sulfate

Exercise  3.5.1  

Write the formulas of the following ionic compounds:

(a) chromium(III) phosphide

(b) mercury(II) sulfide

(c) manganese(II) phosphate

(d) copper(I) oxide

(e) chromium(VI) fluoride

Answer

(a) CrP; (b) HgS; (c) Mn3(PO4)2; (d) Cu2O; (e) CrF6

Explanation:

The given compound is francium sulfate.

Explanation:

While naming ionic compounds :

First, write the name of cation Then after that name of the anion.

Given

The molecule formula of a compound[tex]Fr_2SO_4[/tex]:

To find:

The name of the given compound formula

Solution:

Cation in formula = [tex]Fr^+[/tex] = Francium cation

Anion in the formula= [tex]SO_4^{-2}[/tex] = Sulfate anion

So, the name of the given compound is francium sulfate.

Learn more about the naming of compounds here:

brainly.com/question/863443?referrer=searchResults

brainly.com/question/8968140?referrer=searchResults

The modern synthesis combined the concepts of _______ and evolution.

Answers

Answer:

genetics

hope this helps :)

Explanation:

Volcanic belts form along
a.
islands in the Pacific Ocean.
b.
North American mountain ranges.
c.
the boundaries of Earth’s plates.
d.
the coast of Antarctica.


Please select the best answer from the choices provided

Answers

C. The boundaries of earths tectonic plates

ultraviolet radiation has a higher frequency than visible light. which type of light wave carries more energy?
a=they carry the same amount of energy
b=visible light
c= ultraviolet radiation

Answers

Answer:

The answer to this question is C; ultraviolet radiation

Explanation:

The the reason for this is because it carries more energy per photon than visible light does. Light travels at a speed of 299,792 kilometers per second (about 186,282 miles per second).

True/False: Units for gas density are grams/L

Answers

Answer:

false

Explanation:

I believe it’s false. Please correct me if I’m wrong!

The diagram shows a stage in meiosis.



Which stage of meiosis is pictured?

metaphase I
anaphase I
metaphase II
anaphase II

Answers

Answer:

It's not A or D

Explanation:

I was looking all over for answers and I saw A and D, so I used A. It was wrong, so I retook it and used D. Wrong. Your answer is either B or C. I am sorry I couldn't help more.

Answer:

it is b same question was on my quiz

Explanation:

A solution that has a pH of 5

Answers

Answer:

don't you have any options

what property of matter describe how matter reacts with other matter ?

a.flammable
b.color
c.shape
d.volume

Answers

a. flammable i believe

Answer:

Flammability

Explanation:

Flammability is a chemical property. So, this means that it must react with a substance.

Color, shape, and volume are physical traits. This means that no other matter needs to be included in order for this trait to be so.

Do you think your meal would allow your cells to sufficiently build your cell
membranes? Why or why not?

Answers

Answer:

Cells are the fundamental units of life ' the bricks from which all your. which are built of your cells, will become compromised, and you can. of these new cells from the nutrients you get in your food is one way. Let's take a look inside one of your cells and see what the nutrients really do.

Explanation:

I am tryna make sure of my answer is this correct

Answers

i think it is but i don’t truly know-

Answer:

great job!!

Explanation:

ALL IS CORRECT :)

Describe how evaporation relates to heat regulation in your body.

Answers

When the water on our skin evaporates, it absorbed heat and that heat is drawn away from our body. This is called an endothermic reaction because it absorbs heat. Ultimately this is how our body cools down

The maximum number of electrons that can fill the second energy level

Answers

Answer:

8

Explanation:

the maximum number of electrons that can fill the second energy level is eight

can you help me with percent abundance??​

Answers

Percent abundance is the percentage of all the different isotopes of an element and is used to calculate the average atomic mass. For example 99.98% of all Hydrogen in the universe is [tex]^1H[/tex] meaning hydrogen with 1 proton and 0 neutrons while the remaining 0.02% is  [tex]^2H[/tex] meaning that [tex]^1H[/tex] is the most abundant by  percent.

Is this actually right

Answers

Answer:

what?????????i don't see a question

Answer:

Yes

Explanation:

Use the rules of significant figures to report the answer to this math question: (454.3 cL x 17.84 dL )/3.1 L =

Answers

Answer:

2614.423226

Explanation:

Ore deposits contain high amounts of
A) water
B) volcanic magma
C) metals
D) minerals

Answers

Our deposits contain high amounts of metals

3. In an exercise to teach students how to use and analytical balance, the instructor
gives a student a quarter which has been pre-weighed as 5.6026 g. The weight that the
student obtains for the same quarter is 5.6013 g. What is the percent error in the
students reading?

Answers

Answer:

The percent error is 0.023%.

Explanation:

Pre-weighed of a quarter is 5.6026 g.

The weight that the  student obtains for the same quarter is 5.6013 g.

We need to find the percent error in the students reading. It is given by the formula as follows :

[tex]\%=\dfrac{|\text{original value-calculated value}|}{\text{original value}}\times 100[/tex]

Putting all the values, we get :

[tex]\%=\dfrac{5.6026 -5.6013 }{5.6026 }\times 100\\\\\%=0.023\%[/tex]

So, the percent error is 0.023%.

50 POINTS: PLEASE ANSWER AS QUICK AS POSSIBLE!

Question:

After getting their results in, a group of scientists went back and looked at their study. As planned, their experiment consisted of three groups. The first group received a new medicine at a normal dose, the second group received the medicine at half the dose, and the third group received the medicine at twice the dose.

Which of the following best describes what went wrong with the scientists’ study?


Choices:

- an improper experimental procedure

- the lack of a control group

- selection bias

- human error

Answers

Explanation:

The lack of a control group

The answer would be “the lack of a control group.” To make the results more accurate, the scientists should have used a placebo group to use as a comparison.

The speed of light in plastic is 2.0 x 108 m/s. Calculate the index of refraction for
plastic.

Answers

Answer:

n=c/v.

1.5=3×10^8/v

v=3×10^8/1.5

v=2×10^8 m/s

Hope this helps :)

The index of refraction for plastic, when speed of light in plastic is 1.5.

How do we calculate refraction index?

Refraction index of any substance will be calculated by using the below equation:

n = c/v, where

c = speed of light in vaccum = 3×10⁸ m/s

v = speed of light in plastic = 2×10⁸ m/sec

On putting values in the above equation, we get

n = 3×10⁸ / 2×10⁸ = 1.5

Hence the refractive index of plastic is 1.5.

To know more about refractive index, visit the below link:
https://brainly.com/question/83184

#SPJ2

WILL MARK BRAINLIEST!!!! HELPPPP
what is the difference between simple distillation and fractional distillation

Answers

Answer:

A single distillation cycle is enough to separate the mixture. ... Simple distillation is the method used to separate substances in mixtures with significantly different boiling points, while fractional distillation is used for mixtures containing chemicals with boiling points close to each other.

Explanation:

how many atoms can you fit on the head of a pin ​

Answers

Answer:

According to google, "About five million million hydrogen atoms could fit. Some factors would affect that number like the area of the head and the size of atoms (as well as attractions between atoms). Some atoms are larger than others." Is this accurate? I'm not sure. Good luck! :)

Other Questions
describe three provisions included in the Texas Constitution of 1836 that were unusual yet greatly debated atthe convention. which angle pairs are congruent? Select all that apply Carol invested $2,560 into two accounts. One account paid 6% interest and the other paid 8% interest. She earned 7.25% interest on the total investment in one year. How much money did she put in each account? Use the general formula, I=Prt, to model simple interest applications, where I is equal to the interest, P is equal to the product of the principal, r is equal to the rate, and t is equal to the time. A camp counselor has a list of 134 campers who signed up for art class. The counselor can place 8 students in each class. How many classes does the counselor need to have? What the things aid in the movement of the lymph? * Please help I have 30 more minutes to answer* All of the following led to the first crusade EXCEPT:a.disputes over the Holy landc.heresy among the peasantsb.religious differences between Muslims and Christiansd.revenge toward the Jews Why is "who can participate" the most important classification? a group of hikers begin in an elevation of -29 feet below sea level. they travel up a mountain side until they were on an elevation of 245 feet abos sea level. what was the total change in elevation for the hikers? f(x)=x-5g(x) = 2x+1Write the expressions for (f-g)(x) and (f+g)(x) and evaluate (fg)(4). What are some ways that intercessory prayer makes a difference in the lives of others?(my answer)There is only one Intercessor to God the Father, and that is via His Son, Jesus. When you pray, you are to ask the Father in Jesus' name. In John 16:23-23 we read, "And in that day you will ask Me nothing. Most assuredly I say to you, whatever you ask the Father in My name, He will give you. Until now you have asked nothing in My name. Ask, and you will receive, that your joy may be full."There is no other name under Heaven where we may come to the Throne of God and ask for our needs. All humans die and return to the ground/grave (hell). We all 'sleep' until the time of our Resurrection as the Scripture is clear on. Imagine you are researching the invention of drones and their controversial uses. Compare these two images and then answer the question that follows.Two images labeled A and B side by side. Both are images show websites on the topic of drone hovercraft. Image A has these features, 2013 date, URL of www.dronehovercraft.net, an award seal for Great Content!, an advertisement for candy, and a title of Drones, The 21st Century Spy Assassin. Image B has these features, 2012 date, URL of www.dronehovercraft.gov, a quote from Prisident Obama stating Creating a legal structure on how we use unmanned weapons, drones, is going to be a challenge for me and my successors. The page has a title of Drones, Rules on Use and Misuse. Grace Davies / Omni-Photo Communications, Inc. / Universal Images Group / Image Quest 2013Which source is more credible for your research and why? A is more credible because it presents the truth about how drones are being used. It has also won an award for great content. A is more credible because it is more up to date than B, with specifics about drone use. B gives confusing and boring information. B is more credible because it is from a government site, so it is meant to inform. It has a quote that shows drones are in debate. B is more credible because it shows both sides of the drone debate, whereas A is biased. A is only trying to entertain and get attention. a shape is shown on the graph Which of the following is a reflection of the shape NEED HELP ASAP WITH THESE QUESTIONS GIVING FAIR AMOUNT OF POINTS IF HELPED WITH ALL QUESTIONS Violet light has a wavelength of 4.20 x 10-12 m. What is the frequency? 3. A photon has a frequency (n) of 3.468 x 106 Hz. Calculate its energyCalculate the energy (E) and wavelength (l) of a photon of light with a frequency of 4.215 x 1014 Hz.Calculate the frequency and the energy of blue light that has a wavelength of 400 nm(h = 6.62 x 10-34 J-s). Calculate the wavelength and energy of light that has a frequency of 9.5 x 1015 Hz.A photon of light has a wavelength of 0.090 cm. Calculate its energy.Calculate the energy and frequency of red light having a wavelength of 2.80 x 10-5 cm.Calculate the energy (E) and wavelength (l) of a photon of light with a frequency of 5.165 x 1014 Hz.The wavelength of green light from a traffic signal is centered at 7.20 x 10-5 cm. Calculate the frequency.If it takes 1.56 seconds for radio waves (which travel at the speed of light) to reach the moon from Earth, how far away is the moon? Calculate the frequency of light that has a wavelength of 4.20 x 10-9m. Identify the type of electromagnetic radiation. Solve for a.a+(5)=12 Students were given four unknown substances and asked to observe theircharacteristics. Their observations are shown in the table below:Which of the unknown substances is MOST likely a metal? Which of The following would not affect self image What is the perimeter, in units, of the polygon ABCDEF? PLEASSE HELPP Helppp please i got hella hw!!!! At least 5 sentencesPROMPT: What is the overall message of Mad Woman by Taylor Swift?Answer using the response paragraph format:TWO QUOTES-one from each piece. Be sure they are embedded & cited)-highlight quotes any color, highlight the citation a different color. Example of embedded quote with citation: In the song Mad Woman, Taylor Swift compares herself to a scorpion by saying they strike to kill, suggesting that when she gets provoked, she will fight back (Swift). Commentary (your thoughts/opinions)-[place brackets around commentary] Hi! I've been stuck on this for awhile although it seems so easy I can't get by it :/ What is the most popular movie in 2020 Please tell me I want too see one I am QUEEN OF BORED lol