how many atoms are in 4.67 grams of sample of silicon

Answers

Answer 1
2.33 is the right answer.

Related Questions

An example of a suspension is:
A. blood
B. gelatin
C. muddy water
D. milk

Answers

ANSWER:A.blood

WHY: because it make the most sense and it seem right


Can I get brainly

12
"C
What is the number of protons in this carbon atom?
ÖA 12
OB. 6
Ос.
18
OD. 24
what is the answer

Answers

Answer:

B

Explanation:

the number of protons never changes even if the atomic mass changes

Think about a hot summer afternoon at the beach
or a lake. How do the temperatures of the sand
and water compare?
A. The sand is hot; the water is cool.
B. The sand is hot; the water is hot.
C. The sand is cool; the water is cool.
D. The sand is cool; the water is hot.

Answers

A. Would be the correct answer :-)

Answer:

D

Explanation:

I say this because of this that I read. There was a study shown

"Our experiment was a success. We obtained data that answered our problem, “Which substance absorbs the most heat on a hot day? Sand, water, or sand with water?” The results showed that from the twenty-five trials: the cup of sand temperature ranged from 63-68°C, cup of water temperature ranged from 71-77°C, and the cup of sand with water temperature ranged from 66-71°C. Based on our data, our hypothesis was incorrect. We hypothesized that the sand would absorb the most heat since it is darker and less reflective than water; but from our data, water absorbed the most heat. In conclusion, sand absorbed the least amount of heat and water absorbed the most. Next time we want to cool down at the beach, we’ll know where to go!"

This was an experiment that was performed and this is the conclusion

Hope that helps

PLEASE HELP ME!!! i have no idea how to answer these!

Answers

Answer: Im answering this for points

DONT COME ON MY STUFF SAYING THAT I GOT SCHOOL TO DO JUST LIKE YOU AND YOUR GIVING ME IRRELEVANT ANWSERS JUST TO GET POINTS? THATS A WASTE OF MY TIME

Explanation:

During a hurricane, what effect can the ocean have on the beach?

Answers

As the hurricane moves toward shore, the underwater tumult can cause shifting sands and muddy shallow waters, blocking the essential sunlight on which corals and other sea creatures rely. (Brainliest please)

hi, if your looking for extra points (50+) and br ainiest here is ur chance, answer this question correctly plz

Answers

Answer:

Evaporation and condensation

Explanation:

Pb(NO3)+MgI2=Mg(NO3)+PbI2 what type of reaction?

Answers

Pb(NO3) + MgI2 = Mg(NO3) + PbI2 is an example of a double-replacement reaction.

what is a 7 letter word that starts with f: Ancient plants and animals formed into rocks.

Answers

Answer:

Fossils?

Explanation:

HELPPP PLZZ

During lunch each day, Alex and Hailey have been noticing the trashcans around the lunchroom are filling rather quickly with cans and bottles. They decide a recycling program would be beneficial for their school and the environment, so they brainstorm ways to get the program started. Before discussing their idea with the principal, they need to decide which of their plans would best solve the problem. Which of their ideas would best solve the problem with the least amount of inconvenience (disturbance) for everyone involved? A) Ask volunteers to separate recyclable materials from the trash. B) Remove all vending machines that sell plastic bottles or aluminum cans. C) Get a petition started to build a recycling center close to the school. D) Place plastic and metal recycling bins next to each lunchroom trash can

Answers

Answer:

c

Explanation:

i think it is C but idek but to me it sounds like the best answers but tell me if im wrong pls give me feedback

The ideas that would best solve the problem with the least amount of inconvenience is to place plastic and metal recycling bins next to each lunchroom trash can.

What is recycling?

The term recycling has to do with the reuse of a material after it has passed through certain processes. The idea of recycling is highly beneficial to the environment.

Thus, the ideas that would best solve the problem with the least amount of inconvenience (disturbance) for everyone involved is to place plastic and metal recycling bins next to each lunchroom trash can.

Learn more about recycling:https://brainly.com/question/11861824

#SPJ2

Calculate the percent composition (out of 100) by weight of potassium in potassium carbonate decahydrate.

Answers

Answer:

12.26%

Explanation:

MM K = 39.1 g/mol

MM K2CO3 . 10H2O = 2x39.1 + 12.01 + 3 x 15.99 + 10 x 18.02= 318.38 g/mol

% by weight = (MM K/MM K2CO3.10H2O ) x 100= (39.1/318.8)  x 100=12.26 %

The percent composition by weight of potassium in potassium carbonate decahydrate is 13.98%

Let's represent the chemical formula of the compound as follows;

potassium carbonate decahydrate = CH₂0KO₁₃

The molecular mass of the compound can be calculated as follows:

Molecular mass of  CH₂₀KO₁₃molecular mass = 12 + 20 + 39 + (16×13) = 279 g/mol

mass of potassium = 39 g

Therefore,

% mass of potassium = 39 / 279 × 100

% mass of potassium = 3900 / 279

% mass of potassium = 13.9784946237

% mass of potassium = 13.98 %

learn more on percentage composition here: https://brainly.com/question/3905173


How many moles are 9.9 * 1024 molecules of methane?

Answers

There would be 0.79 moles

How many formula units make up 10.2 g of magnesium chloride (MgCl2)?

Answers

Answer:

6.46×10²² formula units

Explanation:

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

Mass of MgCl₂ = 10.2 g

Number of formula units =?

From Avogadro's hypothesis,

1 mole of MgCl₂ = 6.02×10²³ formula units

But,

1 mole of MgCl₂ = 24 + (35.5×2) = 24 + 71 = 95 g

Thus, we can say:

95 g of MgCl₂ = 6.02×10²³ formula units

Finally, we shall determine the formula units in 10.2 g MgCl₂. This can be obtained as follow:

95 g of MgCl₂ = 6.02×10²³ formula units

Therefore,

10.2 g of MgCl₂ = (10.2 × 6.02×10²³) / 95

10.2 g of MgCl₂ = 6.46×10²² formula units

Thus, 10.2 g of MgCl₂ contains 6.46×10²² formula units

Select the correct answer.
Which of these is always equal to the molar mass of any element?
OA
its atomic number
B.
its atomic weight
OC.
its atomic formula
OD.
its atomic structure

Answers

Answer:

a t o m i c w e i h g t

B

Explanation:

a to m i c w e i g h t

How many grams of air are required to complete the combustion of 120 g of phosphorous to diphosphorous pentoxide, assuming the air to be 23% oxygen by mass?

Answers

Answer:

Explanation:

522 g

Explanation:

Your starting point here will be the balanced chemical equation for this combustion reaction

4

P

(s]

+

5

O

2(g]

2

P

2

O

5(s]

Notice that you have a

4

:

5

mole ratio between phosphorus and oxygen. This means that, regardless of how many moles of phosphorus you have, the reaction will always need

5

4

time more moles of oxygen gas.

Use phosphorus' molar mass to determine how many moles you have in that

93.0-g

sample

93.0

g

1mole P

30.974

g

=

3.0025 moles P

Use the aforementioned mole ratio to determine how many moles of oxygen you would need for many moles of phosphorus to completely take part in the reaction

3.0025

moles P

5

moles O

2

4

moles P

=

3.753 moles O

2

Help pleaseee!!!Please explain how evaporation condensation and precipitation are involved in the water cycle

Answers

Answer: The water cycle shows the continuous movement of water within the Earth and atmosphere. ... Liquid water evaporates into water vapor, condenses to form clouds, and precipitates back to earth in the form of rain and snow. Water in different phases moves through the atmosphere (transportation).

Explanation:

Answer:

water evaporates into water vapor, condenses to form clouds, and precipitates back to earth in the form of rain and snow.

Explanation:

evaporation, condensation, precipitation, and collection. condensation: this is when water vapor in the air cools down and turns back into liquid water. precipitation: this is when water (in the form of rain, snow, hail, or sleet) falls from clouds in the sky.

good luck :)

hopefully, this helps

have a great day !!

Assume the copper was not thoroughly dried. How will the following calculations be affected?

The calculated mass of copper will be too low or too high?
The calculated moles of copper will be too low or too high?
The calculated mass of chlorine will be too low or too high?
The calculated moles of chlorine will be too low or too high?

Answers

The answer should be A, I could be wrong though. Water seeps into any open crack or pore, making something denser, therefore could cause more (or less) mass.

Which change represents an oxidation reaction?

Answers

Here is the answer. (E) F e + Cu2^+^ — Fe^2+^ + Cu

Please someone help me with this!!

Answers

You’re answer would be A, when you open a parachute it captures air and shoots you upwards for a couple seconds because of how fast it slows the weight down.

Please help me thanks

Answers

Answer:

an imbalance of positive and negative charges

Explanation:

Answer:

hope it help s answer circle 3

Name the functional group in the
following molecule:
HSCH2CH3
A. alkane
B. amide
C. thiol
D. alkyl halide

Answers

Answer:

C. thiol

Explanation:

Answer:

it's C thiol I just took the test

hope this helps

have a good day :)

Explanation:

PLEASE HELP!!!
a person measures the mass of a 10cm3 rock to be 15g. what is the density of the rock

Answers

Answer:

[tex]d=1.5\ g/cm^3[/tex]

Explanation:

Given that,

The mass of the rock, m = 15 g

The volume of the rock, V = 10 cm³

We need to find the density of the rock. The density of an object is equal to the mass per unit volume such that,

[tex]d=\dfrac{m}{V}\\\\d=\dfrac{15\ g}{10\ cm^3}\\\\d=1.5\ g/cm^3[/tex]

So, the density of the rock is equal to [tex]1.5\ g/cm^3[/tex].

milk milk milk........

Answers

Answer:

gimme that chocky milk.....

Explanation:

Answer:

m i l k

Explanation:

Which pieces of information do you need to locate a particular star on a star

Answers

Answer:

You need a telescope and a pear of eyes

Explanation:

Ok so this is my opinion you will need a telescope and you will also need it to be night and need eyes of course!

Which unit is NOT correctly paired?
O Liters : Volume
O Formula Mass : Count
O Grams: Mass
O Molecules : Mass

Answers

Answer:

Molecules : Mass

Explanation:

The first three answer choices correctly pair a unit with what it measures. Molecules are not used to measure mass; grams are.


Which units can be used to measure length or distance? Check all that apply.
gram
meter
kilometer
liter
inch

Answers

Answer:

Meter, kilometer & inch - used to measure length or distance.

Unknown compound Q is spotted on a TLC plate that is then developed in dichloromethane. The solvent front is measured at 5.2 cm and the distance traveled by compound Q is measured at 3.4 cm. A sample of aspirin is spotted on a TLC plate that is then developed in dichloromethane. The solvent front is measured at 4.15 cm and the distance traveled by aspirin is measured at 2.70 cm. What can be determined about the identity of compound Q in light of this data

Answers

Answer:

Follows are the solution to the given question:

Explanation:

The Rf value on the Q is =0.65

The Rf value in the acetaminophen is =0.651

In this question, its identity the Q is probably in the acetaminophen since the value which is used to calculates, and however almost the same, and it is used to ensure the other document which is the substances, that are evaluated.

If I began this reaction with 1.7g of O2 , how much water would I make

Answers

what’s up my john and i’m here to help you the answer is 0.87

Calculate the molecular mass for the following: SnO2

Answers

Answer:

[tex]MM=150.71g/mol[/tex]

Explanation:

Hello there!

In this case, since the molar masses of chemical compounds allow us to understand the mass they have per mole of substance, for tin oxide, we can see it has one tin atom and two oxygen atoms; thus, for the calculation of this molar mass we multiply the atomic masses by the number of atoms and them add the results up:

[tex]MM=m_{Sn}+2m_O\\\\MM=118.71g/mol+2*16.00g/mol\\\\MM=150.71g/mol[/tex]

Best regards!

Instruction
Active
TRY IT Writing Measurements in Scientific Notation
Choose the scientific notation that best represents the standard notation given.
6,840,000,000 m
68.4 x 108 m
6.84 x 108 m
6.84 x 10-9 m
6.84 x 109 m
0.000000000143 g
-1.43 x 1010 g
1.43 x 10-10 g
14.3 x 1010 g
14.3 x 10-10 g
COMPLETE
DONE

Answers

No se pero quiero puntos porque estoy en examen, perdonnn =(

Answer:

D & B

Explanation:

just did it

Tris is a molecule that can be used to prepare buffers for biochemical experiments. It exists in two forms: Tris (a base) and TrisH (an acid). The MW of Tris base is 121.14 g/mol; the MW of TrisH is 157.6 g/mol (the extra weight is due to the Cl- counterion that is present in the acid). The Ka of the acid is 8.32 X 10-9. Assume that you have TrisH in solid form (a powder), unlimited 1M HCl, unlimited 1 M NaOH and an unlimited supply of distilled water. How would you prepare 1 L of a 0.02 M Tris Buffer, pH

Answers

Solution :

The reaction :

[tex]$\text{TrisH}^+ + \text{H}_2\text{O} \rightarrow \text{Tris}^- +\text{H}_3\text{O}^+$[/tex]

We have

[tex]$K_a = \frac{[\text{Tris}^-]\times[\text{H}_3\text{O}^-]}{[\text{TrisH}^+]}$[/tex]

     [tex]$=\frac{x^2}{0.02-x}$[/tex]

     [tex]$= 8.32 \times 10^{-9}$[/tex]

Clearing x, we have [tex]$x=1.29 \times 10^{-5}$[/tex] moles of acid

Now to reach pH = [tex]$7.8 (\text{ pOH} = 14-7.8 = 6.2)$[/tex], we must have an [tex]$OH^-$[/tex] concentration of

[tex]$[OH^-] = 10^{-pOH}$[/tex]

          [tex]$=10^{-6.2}$[/tex]

         [tex]$=6.31 \times 10^{-7}$[/tex] moles of base

We must add enough NaOH of 1 M to neutralize the acid calculated above and also add the calculated base.

[tex]$n \ NaOH = 1.29 \times 10^{-5} + 6.31 \times 10^{-7}$[/tex]

               [tex]$=1.35 \times 10^{-5}$[/tex] moles

Vol [tex]$NaOH = 1.35 \times 10^{-5} \text{ moles} \times \frac{1000 \ mL}{1 \ mol}$[/tex]

                 = 0.0135 L

Tris mass [tex]$H^+ = 0.02 \text{ mol} \times 157.6 \ g/mol$[/tex]

                        = 3.152 g

To prepare the said solution we must mix

-- [tex]$3.152 \ g \text{ TrisH}^+$[/tex]

-- [tex]$0.0135 \ mL \ NaOH \ 1M$[/tex]

-- [tex]$\text{Gauge to 1000 mL with H}_2\text{O}$[/tex]

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write about a time you worked really hard for something the subject is exercise 3.2Based on economic theory, if a person wants to purchase a large stereo system, what must necessary occur?Creation of resourcesanalysis of resourcesLocation of resourcesproduction of resources please please i need this Can someone please help me with this problem. Thank you what does s equal?pls help me plsss. his parents have brought him to be polite. to passive voice can somebody help me with this SIMPLE,PROGRESSIVE,PERFECT OR PROGRESSIVE ASPECT1. chased2. was talking3. had been fishing4. will be dancing5. had been keeping6. has ended7. is walking8. am living9. will have been walking10. will have ended Task B: Use the following maps to complete the questions:Plantsburgh209030Watertown35920988Lake OntarioRochester317Buffalo29112029 96018LakeErie-992-Utica42,983)39AlbanyIthaca-9960513640 960100038100410081. Which type of pressure center is shown on the map?a) Low pressureb) High pressureune used to collect this data Can someone help me Balance chemical equations please Study the map here. Then choose the word or phrase that best completes each sentence about Europeanexplorationfound a sea route around southern Africa in 1488.Vasco da Gama found a route toby sailing around Africa in 1498.explored northeastern Canada in 1534.In 1609, exploration of inland waterways in what is now the northern US led to the European discovery of the please help first image pleaseeeeee............................................ 4ax + 2bx =??Es urgente Are acceleration and mass proportional or inversely proportional values? Point B has coordinates (4,1). The x-coordinate of point A is -8. The distance between point A and point B is 13 units. What are the possible coordinates of point A? Please someone explain how to solve this piecewise function!!!! Im super confused In a mass spectrometer, a specific velocity can be selected from a distribution by injecting charged particles between a set of plates with a constant electric field between them and a magnetic field across them (perpendicular to the direction of particle travel). If the fields are tuned exactly right, only particles of a specific velocity will pass through this region undeflected. Consider such a velocity selector in a mass spectrometer with a 0.105 T magnetic field.Part (a) What electric field strength, in volts per meter, is needed to select a speed of 3.8 106 m/s?Part (b) What is the voltage, in kilovolts, between the plates if they are separated by 0.75 cm? Two data sets contain an equal number of values. The double box and whisker plot represents the values in the data set. Compare the data sets using measures of center and variation. What is the value of: 1 + int(3.5) / 2?Select one:a. 2b. 2.25C. 2.5d. 3 Plz help will mark you brainliest if correct