Answer:
2
Explanation:
Density = mass/volume
m=24
v=2*3*2=12
24/12=2
Answer:
[tex]\boxed {\tt d= 2 \ g/cm^3}[/tex]
Explanation:
Density can be found using the following formula.
[tex]d=\frac{m}{v}[/tex]
where [tex]m[/tex] is the mass and [tex]v[/tex] is the volume.
We know the mass is 24 grams. We must find the volume.
Since it is a rectangle, the volume can be found using the following formula.
[tex]v=l*w*h[/tex]
The length is 2 centimeters, the width is 3 centimeters and the height is 2 centimeters.
[tex]v= 2 \ cm * 3 \ cm * 2\ cm[/tex]
[tex]v= 6 \ cm^2 * 2\ cm[/tex]
[tex]v= 12 \ cm^3[/tex]
Now we know the volume, and can substitute it into the density formula.
[tex]d=\frac{m}{v}[/tex]
[tex]m= 24 \ g\\v= 12 \ cm^3[/tex]
[tex]d=\frac{24 \ g}{12 \ cm^3}[/tex]
[tex]d= 2 \ g/cm^3[/tex]
The density is 2 grams per cubic centimeter.
How does the number of valence electrons in atoms of metalloids explain why metalloids are semiconductors? They have one or two valence electrons, so they cannot lose electrons easily. They have one or two valence electrons, so they can lose or gain electrons. They have three to six valence electrons, so they cannot lose electrons easily. They have three to six valence electrons, so they can lose or gain electrons.
Answer:
They have three to six valence electrons, so they can lose or gain electrons.
Explanation:
Here, we are required to identify how the number of Valence electrons on atoms of metalloids explain why metalloids are semiconductors.
This is because; They have three to six valence electrons, so they can lose or gain electronsMetalloids are elements in the periodic table which are characterized by the the presence of 3 to 6 Valence electrons.
Metalloids unlike Alkali and alkali earth metals (which have 1 and 2 Valence electrons and are highly electropositive) and halogens( with valency of 7 and are highly electronegative) have three to six valence electrons and are therefore able to lose or accept electrons.Ultimately, the presence of three to six Valence electrons and the ability to either lose or gain electrons is the criteria for their semiconductor character.
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The vapor pressure of carbon disulfide is 355.6 torr at 25°C. What is the vapor pressure of a solution prepared by dissolving 10.60 g naphthalene (C10H8, Molar Mass = 128.2 g/mol) in 155 mL CS2 liquid (Molar Mass = 76.14 g/mol, density = 1.261 g/mL)? Assume the solution obeys Raoult's law, and treat naphthalene as a nonvolatile solute.
Answer:
344.5764 torr
Explanation:
Molar mass of naphthalene = 128.2g/mol
Mass of naphthalene = 10.60 g
Carbon disulfide:
Molar mass= 76.14g/mol ;
volume = 155mL ;
density = 1.261 g/mL
Vapour pressure = 355.6 torr
Number of moles = mass / molar mass
CS2:
Mass = density × volume
Number of moles = (density × volume) / molar mass
Number of moles = (1.261 * 155) / 76.14 = (195.455 / 76.14) = 2.567 moles of CS2
Number of moles of C8H10:
Number of moles = 10.60 / 128.2 = 0.083 C8H10
Total number of moles :
2.567 + 0.083 = 2.65 moles
Mole fraction of each compound in solution :
CS2 :
2.567 / 2.65 = 0.969
C8H10:
0.083 / 2.65 = 0.031
According to Raoult's:
Psolution = Xsolvent × Posolvent
CS2 = solvent
Xsolvent = Mole fraction of solvent
Posolvent = Vapour pressure of pure solvent
Psolution = 0.969 × 355.6 torr = 344.5764 torr
The vapor pressure of the solution would be as follows:
[tex]344.5764[/tex] torr
Given that,
Vapor pressure of Carbon Disulfide [tex]= 355.6[/tex] torr
[tex]volume = 155mL ;[/tex]
[tex]density = 1.261 g/mL[/tex]
Naphthalene's mass [tex]= 10.60 g[/tex]
Naphthalene's molar mass [tex]= 128.2g/mol[/tex]
Now,
We know that
Number of moles [tex]= mass/molar mass[/tex]
Mass [tex]= density[/tex] × [tex]volume[/tex]
[tex]Number of moles =[/tex] [tex](density[/tex] × [tex]volume) / molar mass[/tex]
So,
Number of moles of Carbon Disulfide [tex]= (1.261[/tex] × [tex]155) / 76.14[/tex]
[tex]= (195.455 / 76.14)[/tex]
[tex]= 2.567[/tex] moles of Carbon Disulfide
Number of moles of Naphthalene:
Number of moles [tex]= 10.60 / 128.2[/tex]
[tex]= 0.083[/tex]
Now,
Total number of moles :
[tex]2.567 + 0.083[/tex]
[tex]= 2.65[/tex] moles
Mole fraction of each compound in solution :
Carbon Disulfide:
2.567 / 2.65
[tex]= 0.969[/tex]
Naphthalene
0.083 / 2.65
[tex]= 0.031[/tex]
According to Raoult's:
P[tex]solution = Xsolvent[/tex] × [tex]Posolvent[/tex]
Carbon Sulfide = Solvent
[tex]Xsolvent =[/tex] Mole fraction of solvent
[tex]Posolvent =[/tex] Vapour pressure of the pure solvent
[tex]Psolution[/tex] [tex]= 0.969[/tex] × [tex]355.6 torr[/tex]
[tex]= 344.5764[/tex] torr
Thus, "[tex]344.5764[/tex] torr" is the correct answer.
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Bismuth oxide reacts with carbon to form bismuth metal: Bi2O3(s) + 3C(s) → 2Bi(s) + 3CO(g) When 775 g of Bi2O3 reacts with excess carbon, (a) how many moles of Bi form? mol Bi (b) how many grams of CO form? g CO
Answer:
(a) 3.33 mol Bi
(b) 140. g CO
Explanation:
Step 1: Convert 775g to moles
Bi Molar Mass - 208.98 g/mol × 2 = 417.98 g/mol
O Molar Mass - 16.00 g/mol × 3 = 48.00 g/mol
775g Bi₂O₃ ÷ 465.98 g/mol = 1.66316 mol Bi₂O₃
Step 2: Find the conversion from Bi₂O₃ to Bi
1 mole of Bi₂O₃ equals 2 moles of Bi
Step 3: Use Dimensional Analysis
1.66316 mol · [tex]\frac{2 \hspace{2} mol \hspace{2} Bi}{1 \hspace{2} mol \hspace{2} Bi_2O_3}[/tex] = 3.32632 mol Bi
3.32632 mol Bi ≈ 3.33 mol Bi (3 significant figures)
Step 4: Find the conversion from Bi₂O₃ to CO
1 mole of Bi₂O₃ equals 3 moles of CO
Step 5: Use Dimensional Analysis
1.66316 mol · [tex]\frac{3 \hspace{2} mol \hspace{2} CO}{1 \hspace{2} mol \hspace{2} Bi_2O_3}[/tex] = 4.98948 mol CO
Step 6: Find molar mass of CO and convert moles to grams
C - 12.01 g/mol
O - 16.00 g/mol
4.98948 mol CO · 28.01 g/mol = 139.775 g CO
139.775 g CO ≈ 140. g CO (3 significant figures)
Identify the type of chemical reaction taking place in the following and write in balanced equation from
a) Barium Chloride mixed with copper sulphate solution and a white precipitate is observed b) On heating green colour sirf ferrous sulphate crystals reddish brown solid left and smell of gas having order of burning sulphur is produced.
Answer:
a. The balanced chemical equation is written below and this is a type of double displacement reaction.
Explanation:
When barium chloride reacts with copper sulfate, a white precipitate of barium sulfate is observed.
The chemical equation for the reaction of barium chloride and copper sulfate follows:
b.
2FeSO4--(heat)---> Fe2O3 + SO2+ SO3
This Reaction is an example of Thermal Decomposition Reaction.
What is the charge of a chromium ion that has lost 4 electrons?
Answer:
+2.
Explanation:
Hello,
In this case, since chromium has six valence electrons in its outer shell, when it loses four electrons it remains with two of them, therefore it charge as chromium ion is +2, so it is written as Cr⁺² and named as chormium (II) or hypochromous ion.
Best regards.
What is the solubility product expression for Zn3(PO4)2?
Answer:
[tex]Ksp=[Zn^{2+}]^3[PO_4^{3-}]^2[/tex]
Explanation:
Hello,
In this case, since the equilibrium dissociation of zinc phosphate is:
[tex]Zn_3(PO_4)_2(s)\rightleftharpoons 3Zn^{2+}(aq)+2(PO_4)^{3-}(aq)[/tex]
Due to the fact that only the zinc and phosphate ions are in aqueous state, the solubility product expression is written considering the law of mass action in which the concentration of each species is powered to the corresponding stoichiometric coefficient as follows:
[tex]Ksp=[Zn^{2+}]^3[PO_4^{3-}]^2[/tex]
Best regards.
Chromium(III) oxide reacts with hydrogen sulfide (H2S) gas to form chromium(III) sulfide and water: Cr2O3(s) + 3H2S(g) → Cr2S3(s) + 3H2O(l) To produce 156 g of Cr2S3, (a) how many moles of Cr2O3 are required? mol (b) how many grams of Cr2O3 are required? g
Answer:
(a) 0.779 mol Cr₂O₃
(b) 118 g Cr₂O₃
Explanation:
Step 1: Convert 156 g Cr₂S₃ to moles
Cr Molar Mass - 52.00 g/mol × 2 = 104.00 g/mol
S Molar Mass - 32.07 g/mol × 3 = 96.21 g/mol
156 g Cr₂S₃ ÷ 200.21 g/mol = 0.779182 mol Cr₂S₃
Step 2: Find conversion from Cr₂S₃ to Cr₂O₃
1 mol Cr₂S₃ equals 1 mol Cr₂O₃
Step 3: Use Dimensional Analysis
0.779182 mol Cr₂S₃ · [tex]\frac{1 \hspace{2} mol \hspace{2} Cr_2O_3}{1 \hspace{2} mol \hspace{2} Cr_2S_3}[/tex] = 0.779182 mol Cr₂O₃
0.779182 mol Cr₂O₃ ≈ 0.779 mol Cr₂O₃ (3 significant figures)
Step 4: Convert moles to grams
Cr Molar Mass - 52.00 g/mol × 2 = 104.00 g/mol
O Molar Mass - 16.00 g/mol × 3 = 48.00 g/mol
0.779182 mol Cr₂O₃ · 152.00 g/mol = 118.436 g Cr₂O₃
118.436 g Cr₂O₃ ≈ 118 g Cr₂O₃ (3 significant figures)
A beaker can hold 200 cm3 of water. When it's empty, how
many liters are needed to refill it?
L
Answer:
[tex]V=0.200L[/tex]
Explanation:
Hello,
In this case, since the volumetric capacity of the beaker is 200 cm³, by considering that 1000 cm³ equals 1 L, the liters are then computed via the following unit conversion:
[tex]V=200cm^3*\frac{1L}{1000cm^3}\\ \\V=0.200L[/tex]
Best regards.
A. The measured pH of a 0.100 M HCl solution at 25 degrees Celsius is 1.092. From this information, calculate the activity coefficient of H+.B. The measured pH of a solution of 0.010 HCl and 0.090 KCl at 25 degree Celsius is 2.102. Calculate the activity coefficient of H+ in this solution.C. Why does the pH change in part B relative to that in part A?
Answer:
activity coefficient [tex]\mathbf{\gamma =0.809}[/tex]
activity coefficient [tex]\mathbf{\gamma = 0.791}[/tex]
The change in pH in part A = 0.092
The change in pH in part B = 0.102
Explanation:
From the given information:
pH of HCl solution = 1.092
Activity of the pH solution [a] = [tex]10^{-1.092}[/tex]
[a] = 0.0809 M
Recall that [a] = [tex]\gamma[/tex] × C
where;
[tex]\gamma[/tex] = activity coefficient
C = concentration
Making the activity coefficient the subject of the formula, we have:
[tex]\gamma = \dfrac{[a]}{C}[/tex]
[tex]\gamma = \dfrac{0.0809 \ M}{0.100 \ M}[/tex]
[tex]\mathbf{\gamma =0.809}[/tex]
B.
The pH of a solution of HCl and KCl = 2.102
[a] = [tex]10^{-2.102}[/tex]
[a] = 0.00791 M
activity coefficient [tex]\gamma = \dfrac{0.00791 \ M}{0.01 \ M}[/tex]
[tex]\mathbf{\gamma = 0.791}[/tex]
C. The change in pH in part A = 1.091 - 1.0 = 0.092
The change in pH in part B = 2.102 -2.00 = 0.102
write the number in scientific notation 1123
How many atoms are represented by one formula unit of aluminum carbonate A12(CO2)3
Answer:
well ,if I have done my sum rights there are
14 atom in the one formula unit of aluminium carbonate.
Answer:
14 atoms
Explanation:
The particles in a gas have more space between them because
Answer:
They are more spread out.
Explanation:
The atoms and molecules in gases are much more spread out than in solids or liquids. They vibrate and move freely at high speeds. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid.
Answer:
Explanation:
Explanation:
Gas – In a gas, particles are in continual straight-line motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other. In most cases, there are essentially no attractive forces between particles
15.0 g of water is heated from 5 °C up to 37 °C. How much energy is absorbed by
the water? (The specific heat of liquid water is 4.184 J/g °C.)
Answer:
See the answer
1) 15.0 g of water is heated from 5 °C up to 37 °C. How much energy is absorbed by the water? (The specific heat of liquid water is 4.184 J/g°C.)
2)How many joules of energy is required to bring a five-pound (1 pound = 454 g) bag of ice from its freezer temperature at -20.0°C up to 0°C? The specific heat of ice is 2.10 J/g×°C.
3) A 50.0 mg tissue sample is taken from a patient for diagnosis. While waiting for testing, the sample is stored in a -80.0°C freezer. How much energy is released when the sample is cooled from 20.0°C down to the freezer temperature? You may assume the specific heat of the tissue sample is 3.47 J/g×K.
What percentage of light hits Earth’s surface directly?
3 percent
5 percent
31 percent
47 percent
Answer: yall trust me on this one, i took one for the team. The answer is "C" or you can say 31 percent. boys get me 50 thanks.
Explanation:
The percentage of sunlight that hits the Earth's surface directly is 31 percent. The correct option is C.
What is sunlight?Sunlight is the electromagnetic radiation transferred by the sun.
The sun is 93 million away from the earth, so it takes eight and half minutes to reach the sunlight to the earth.
Only 30 to 34 percent of light reaches the earth, and the remaining lights are reflected back by clouds and the earth itself.
Thus, the correct option is C, 31 percent.
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Sample of carbonate rock is a mixture of CaCO3 and MgCO3. The rock is Analyzed in a laboratory and the results are recorded in the table above. Which columns in a table provide all the information necessary to determine the mole ratio of analyzed in a laboratory and the results are recorded in the table above. Which columns in a table provide all the information necessary to determine the mole ratio of Ca to Mg in the rock
Answer:
You need the mass of Mg and Ca in the sample and their molar masses
Explanation:
Its the only answer that made sense because using those 4, can give you their ration
The Columns in the table that provides the information necessary for the calculating the mole ratio of Ca to Mg are columns ; 3, 4, 6, and 7
Although some data related to your question is missing attached below is the missing data
Determining the mole ratio of Ca to Mg
Ca : Mg
mass of Ca / molar mass : mass of Mg / Molar mass
( 36.1 / 40.1 ) : ( 2.4 / 24.3 )
9.14 : 1
∴ The mole ratio of Mg to Ca
≈ 1 : 9
Where: Column 3 = Mass of Mg in the sample ( g )
Column 4 = mass of Ca in the sample ( g )
Column 6 = Molar mass of Mg ( g/mol )
Column 7 = molar mass of Ca ( g/mol )
Hence the Mole ratio of Mg to Ca = 1 : 9
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The solubility of sugar at 50°C is 260/100g water,and at 0°Cis 180g/100g water. What mass of sugar,will be deposited if 60g the saturated solution at 50°C is cooled to 0°C
Explanation:
27 °0 bc that how it is so this is the answer
You have two compounds that you have spotted on the TLC plate. One compound is more polar than the other. You ran the TLC plate with neat hexanes and found that only one spot moved a small distance up the plate. What might you expect to see if you ran a TLC plate in a 50/50 mixture of hexanes and ethyl acetate
Answer:
we will except an increase in the polarity of the system and this will cause the Non-polar spot to be near the solvent front, while the polar spot will run at an approximate speed of 0.5 Rf
Explanation:
when we run a TLC plate in a 50/50 mixture of hexanes and ethyl acetate we will except an increase in the polarity of the system and this will cause the Non-polar spot to be near the solvent front, while the polar spot will run at an approximate speed of 0.5 Rf
The speed of the polar spot depends largely on the level of polarity, an increase in the polarity will see both spots of Neat hexane run when we run a TLC plate in a 50/50 mixture of hexanes and ethyl acetate
what is formed when polyatomic ions bond with other ions.
A) ionic compounds.
B) neutral compounds.
C) ionic elements.
D) neutral elements.
Answer:
iconic compounds is your anwser
Answer:
Iconic Compounds
Explanation:
I watched a video about it.
Have a nice Friday!
Draw an important resonance form to show the delocalization of charge in the ion shown below.
Interactive 3D display mode
Answer:
Hello attached below is the missing ion diagram
Explanation:
Attached below is an important resonance form that shows the delocalization of charge in the ion shown
what is biotic?check all that apply
Answer: biotic is Living things in their ecological relations.
Explanation:
Which of these is a chemical property?
boiling point
odor
ability to rust
color
Answer:
ability to rust
Explanation:
i'm like 90% sure thats correct
Which set of elements has 4 valence electrons?
Answer:
carbon group
All the carbon group atoms, having four valence electrons, form covalent bonds with nonmetal atoms; carbon and silicon cannot lose or gain electrons to form free ions, whereas germanium, tin, and lead do form metallic ions but only with two positive charges.
The set of elements that has 4 Valence electrons are the carbon group.
What are valence electrons?Valence electrons are those electrons that are found at the outermost shell of an element that can go into formation of chemical bonds with another element on a chemical reaction.
The group 14 elements in the periodic table are known to have a four Valence electron on their outermost shell.
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What is a single covalent bond?
Answer: Single Covalent Bonds
Hydrogen and chlorine coming together is an example of a single covalent bond. Two hydrogen atoms will also come together to form a single covalent bond, as will two chlorine atoms. In these examples, each individual atom has just one unpaired electron to share with the other atom.
A Little Backstory I Guess: In chemistry, a single bond is a chemical bond between two atoms involving two valence electrons. That is, the atoms share one pair of electrons where the bond forms. Therefore, a single bond is a type of covalent bond.
sorry its so long :/ hope this even relatively helps...
KCl is an ionic salt with a formula weight of 74.54 g/mole. A 1.417 M (mole/liter) KCl solution has a density of 1064.5 grams/liter at 20.0 OC. Use the Molarity and the formula weight to find the mass (g) of salt in one liter. Then, find the mass (g and kg) of water in one liter of the solution as the difference between the solution mass and the KCl mass. Include the conversion factor. Determine the molality (m), or moles of salt per kg of water, by dividing the moles of salt in one liter by the kg of water in one liter. Show all units and use proper significant figures. (
Answer:
Mass of the salt: 105.6g of KCl.
Mass water: 958.9g of water.
Molality: 1.478m.
Explanation:
Mass of the salt:
In 1L, there are 1.417 moles. In grams:
1.417 moles KCl * (74.54g / mol) = 105.6g of KCl
Mass of the water:
We can determine the mass of solution (Mass of water + mass KCl) by multiplication of the voluome (1L and density 1064.5g/L), thus:
1L * (1064.5g / L) = 1064.5g - Mass solution.
Mass water = 1064.5g - 105.6g = 958.9g of water
Molality:
Moles KCl = 1.417 moles KCl.
kg Water = 958.9g = 0.9589kg.
Molality = 1.417mol / 0.9589kg = 1.478m
A non-conservative force acting on a particle:_________.
A) does work that can depend on the path of motion.
B) does work equal to the change in the kinetic energy of the particle.
C) does work that is never equal to the change in kinetic energy of the particle.
D) can not have an associated potential energy function.
E) does work that only depends on the endpoints of the path, not on the path between the endpoints.
Answer: Option A.
does work that can depend on the path of motion.
Explanation:
A non-conservative force acting on a particle does work that can depend on the path of motion because a non conservative force is a type of force that can remove energy from a progressive system and this energy cannot be restored back and the forces are path dependent because it matters where the particle begin or end.
It is a type of force such as friction or air resistance. This type of force does work that only depend on the path of motion.
Observations made during an experiment are called
A cube has an edge length of 9 cm .
If it is divided up into 1-cm cubes, how many 1-cm cubes would there be?
Answer:
9^3 i think so like 279
Explanation:
blah
28 Which of the following equations does not represent a redox reaction?
A
B
с
D
2AgBr (s) → 2Ag (s) + Br2 (g)
Cu2+ (aq) + Zn (s) → Cu (s) + Zn2+ (aq)
2Fe (s) + 3Cl2 (9) ► 2FeCl3 (s)
MgO (s) + 2HCl (aq) → MgCl2 (aq) + H20 (1
Answer:
The answer is D. In the reactions A,B and C the reactants undergo changes in oxidation number. And also the reaction D is an acid_base neutralization reaction.
If a boy was standing on his head, his mouth would be ___ to his nose.
Answer:
The correct answer is "inferior".
Explanation:
In anatomy, the term inferior is used to describe parts of the body that are below other part used as reference. Inferior comes from the Latin "inferus" that means "below". In this case, the mouth will always be inferior to the nose, it doesn't matter if the boy was standing on his head or if he is in other position.
Answer:
correct answer, inferior.
Explanation:
of little or less importance, value, or merit always felt inferior to his older brother. 2a : of low or lower degree or rank. b : of poor quality : mediocre. 3 : situated lower down : lower.
If one person is regarded as inferior to another, they are regarded as less important because they have less status or ability. He preferred the company of those who were intellectually inferior to himself.
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3. The 2 in 1s2 represents the number of
located in that energy level.
Answers:
electrons
protons
Answer:
electrons
Explanation:
In an atom, you can have varying numbers of electrons, depending on if its an ion or not. You can use the orbitals to see the energy level of the atom.
An atom has only one number of protons. The number of protons cannot vary.