Answer: D) 1.30 and 2.60
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n = moles of solute
[tex]V_s[/tex] = volume of solution in ml
molarity of [tex]MgCl_2[/tex] = [tex]\frac{0.325\times 1000}{250ml}=1.30 M[/tex]
[tex]MgCl_2\rightarrow Mg^{2+}+Cl^{-}[/tex]
As 1 mole of [tex]MgCl_2[/tex] dissociates to give one mole of [tex]Mg^{2+}[/tex] and two moles of [tex]Cl^-[/tex] ions .
Molarity of [tex]Mg^{2+}[/tex] = 1.30 M
Molarity of [tex]Cl^{-}[/tex] = [tex]1.3 M\times 2=2.60M[/tex]
Compare the relative strength of the two forces B and C. Explain how you determined this comparison by identifying the forces.
The intermolecular forces or the strength of C is more than that of B.
What are intermolecular forces?
Intermolecular forces are the forces that hold the molecules of any object in a particular state of matter.It exists between molecules.These forces are weak when compared with intramolecular forces.Hydrogen bonding, dipole-dipole, Vander Walls, and ion-dipole are the types of intermolecular forces.At a short distance, these forces are repulsive but at large distances they are attractive.Here, we can see that C has dipole-dipole interaction while B has none.
Therefore, it states that the intermolecular forces present in C are much more than that in B.
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What causes mountains to form
A) two oceanic plates spreading at a divergent boundary
B) two oceanic plates colliding at a convergent boundary
C) two continental plates spreading at a divergent boundary
D) two continental plates colliding at a convergent boundary
Answer
The Correct Answer Is D
Please help me out with these chemistry questions before 11:59pm
Answer:
The bond in a homonuclear diatomic molecule is non-polar due to the electronegativity difference of zero
Explanation:
Propane tanks that are used on BBQ grills contains large amount of propane gas. Which explanation supports why gas can be easily compressed.
a. Gas has a definite volume
b. Gas particles are far apart so they are easy to compress together.
c. Gas particles takes the shape of the container so it can easily compress together.
Answer:
b. Gas particles are far apart so they are easy to compress together.
Explanation:
What might happen to a plant if the roots grew away from the pull of Earth's gravity?
Answer:
See the answer below
Explanation:
If the root of a plant grows away from the pull of earth's gravity, it will not produce any effect on the plant provided that other conditions of growth are kept normal.
According to research, the force of the Earth's gravity has no effect on the growth features of plants. Plants that were grown away from the influence of gravity still grew normally in a research conducted in space by NASA in 2010.
This thus means that the upward growth of the stem and the downward growth of the root in a negative and positive response to gravity respectively is dictated by the inherent attributes of plants themselves, and not by the force of the earth's gravity.
A combination of any elements bonded together
Answer:
are called Compounds
Answer:
Compouds
think of a group
an they are alll combined
also "compounds" com-bind = com-POUNDS
Make's sense now?
Please show work!
Question below:
Answer:
The answer is B. 11
Explanation:
I did the math and used what I know to find the answer. B is correct.
why is chemistry chemistry?
The concentration in ppm = 125,000 ppm
Further explanationThe concentration of a substance can be expressed in several quantities such as moles, percent (%) weight / volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
ppm or parts per million (ppm) :
For water solvent = 1 ppm ⇒ 1 mg/L(1 kg=1 L,ρ water=1 kg/L)
In percent mass = 1 ppm ⇒ 1 mg/ 1 kg
Solution contains 0.25 kg of lead in 2 kg of water :
Solvent = water = 2 kg = 2 L
Solute= lead=0.25 kg=250000 mg
So the concentration in ppm :
[tex]\tt ppm=\dfrac{250,000~mg}{2~L}=\boxed{\bold{125,000~ppm}}[/tex]
Answer:
The concentration in ppm = 125,000 ppm
Explanation:
that is why chemistry is chemistry.
The __________ is the part of the solution that is in the greater quantity, and the __________ is the smaller portion of the solution.
A. solvent/solute
B. solute/solvent
C. mixture/compound
D. compound/mixture
Answer:
the answer should be A ! hope this helps :)
Explanation:
Which is the product of these numbers, to the appropriate number of significant digits?
91.40 x 2.00 =
Answer:
180
Explanation:
just multiply and round to whole number
What is the molecular formula of a component whose molar mass is 88.0 and whose percent composted is 9.1
The molecular formula : C₄H₈O₂
Further explanationMaybe a compound is 54.5% carbon, 9.1% hydrogen and 36.4% oxygen,so :
mol C :
[tex]\tt \dfrac{54.5}{12}=4.54[/tex]
mol H :
[tex]\tt \dfrac{9.1}{1}=9.1[/tex]
mol O :
[tex]\tt \dfrac{36.4}{16}=2.28[/tex]
Divide by 2.28(the smallest ratio) :
C H : O =
[tex]\tt \dfrac{4.54}{2.28}\div \dfrac{9.1}{2.28}\div \dfrac{2.28}{2.28}=2\div 4\div 1[/tex]
The empirical formula : C₂H₄O
(The empirical formula)n=molecular formula
(2.12+4.1+16)n=88
(44)n=88⇒n=2
What volume will 1.5 mol of carbon dioxide occupy?
If you heat a piece of copper, it combines with oxygen from the air to form a black layer of
copper oxide
A) Write a word equation for this reaction
B) How would the mass of your piece of copper change as you heated it?
C) Why would this happen?
Answer:
A. When a piece of copper is heated, it combines with oxygen to form copper oxide. The chemical reaction for the same is as follows:
2 Cu (s) + O2(g) => 2CuO
B. The mass of the piece of copper will remain same and there will be no change in its mass. However, its volume will increase, so its density will decrease.
C. This is so because heating copper in its elemental form is a physical change and there is no change in mass during a physical change. Hence, the mass of copper remain same.
Mg3N2 + 6H2O
--->
3 Mg(OH)2 + 2NH3
Answer:
The equation is balanced
Explanation:
There are 3Mg,2N,12H,6O and on the other side its the same amount on the other side
What is the mass of H2SO4 in a 38.2-cm3 sample of concentrated sulfuric acid that has a density of 1.84 g/cm3 and consists of 98.3% H2SO4
Answer:
69.09 g
Explanation:
First we calculate the mass of the sample of concentrated H₂SO₄, using the given volume and density:
Mass = density * volumeMass = 1.84 g/cm³ * 38.2 cm³ = 70.288 gThere are 70.288 grams of solution, of which 98.3% is H₂SO₄. Thus the H₂SO₄ mass is:
70.288 g * 98.3/100 = 69.09 gTaking into account the definition of density and percentage by mass, the mass of H₂SO₄ in a 38.2 cm³ sample of concentrated sulfuric acid is 69.09 grams.
Definition of densityBut first you must know the definition of density. Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
Mass of solutionIn this case, you know that:
Density= 1.84 [tex]\frac{g}{cm^{3} }[/tex]
Volume= 38.2 cm³
Replacing in the definition of density:
[tex]1.84 \frac{g}{cm^{3} }=\frac{mass}{38.2 cm^{3} }[/tex]
Solving:
mass= 1.84 [tex]\frac{g}{cm^{3} }[/tex]×38.2 cm³
mass= 70.288 g
So, the mass of the solution is 70.288 grams.
Definition of percentage by massThe percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.
In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:
[tex]percentage by mass=\frac{mass of solute}{mass of solution}x100[/tex]
Mass of H₂SO₄In this case, you know:
percentage by mass=98.3%
mass of solute= ?
mass of solution= 70.288 grams
Replacing in the definition of percentage by mass:
[tex]98.3=\frac{mass of solute}{70.288 grams}x100[/tex]
Solving:
[tex]\frac{98.3}{100} =\frac{mass of solute}{70.288 grams}[/tex]
[tex]0.983=\frac{mass of solute}{70.288 grams}[/tex]
0.983× 70.288 grams= mass of solute
69.09 grams= mass of solute
The mass of H₂SO₄ in a 38.2 cm³ sample of concentrated sulfuric acid is 69.09 grams.
Learn more about
density:
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percentage by mass:
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What is the distance from and object’s top to its bottom?
The distance from object’s top to its bottom is Height
The distance from object’s side to side is Length
Which ions have ten electrons in the outermost subshell?
Explanation:
There are ten d electrons in the outermost d subshell for Zn2+.
Which statement describes an interaction between the biosphere and the hydrosphere
The answer is 1) Plant roots take in water through their roots.
Explanation:The biosphere is made up of all the lifeforms present on the Earth. The hydrosphere is constituted of all the water bodies and sources of water.
When a certain lifeforms from the biosphere reaches out to another sphere, preferably to fetch what if requires to survive, it is said that there is an interaction between two spheres of the larger environment.
These spheres are all interdependent on each other. (i did this before)
Answer:
Plant roots take in water through their roots.
Explanation:
EDGE 2021
Butane (C4H10(g), deltaHf =-125.6 kJ/mol reacts with oxygen to produce carbon dioxide (CO2 delta Hf =-393.5 kJ/mol)
The given question is incomplete. The complete question is:
Butane [tex](C_4H_{10}(g)[/tex], Hf = –125.6 kJ/mol) reacts with oxygen to produce carbon dioxide ([tex]CO_2[/tex] , Hf = –393.5 kJ/mol ) and water [tex](H_2O[/tex], Hf = –241.82 kJ/mol) according to the equation below. What is the enthalpy of combustion (per mole) of [tex]C_4H_{10} (g)[/tex]?
Answer: -2657.5 kJ
Explanation:
The balanced chemical reaction is,
[tex]C_4H_{10}(g)+\frac{13}{2}O_2(g)\rightarrow 4CO_2(g)+5H_2O(g)[/tex]
The expression for enthalpy change is,
[tex]\Delta H=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)][/tex]
[tex]\Delta H=[(n_{CO_2}\times \Delta H_{CO_2})+(n_{H_2O}\times \Delta H_{H_2O})]-[(n_{O_2}\times \Delta H_{O_2})+(n_{C_4H_{10}}\times \Delta H_{C_4H_{10})][/tex]
where,
n = number of moles
[tex]\Delta H_{O_2}=0[/tex] (as heat of formation of substances in their standard state is zero
Now put all the given values in this expression, we get
[tex]\Delta H=[(4\times -393.5)+(5\times -241.82)]-[(\frac{13}{2}\times 0)+(1\times -125.6)][/tex]
[tex]Delta H=-2657.5kJ[/tex]
Therefore, the enthalpy of combustion per mole of butane is -2657.5 kJ
The complex [Zn(NH3)2Cl2]^2+ does not exhibit cis-trans isomerism. The geometry of this complex must be __________.A) trigonal bipyramidalB) tetrahedralC) octahedralD) square planarE) either tetrahedral or square planar
Answer:
B) tetrahedral
Explanation:
From the information:
The given complex is [tex]\Big [Zn (NH_3)_2Cl_2 \Big ]^{2+}[/tex]. In this complex, the number of ligands attached to the central metal atom Zn is 4. This, in turn, affects the coordination number of the complex to be 4. For a coordination number with 4, the likely geometry can either be tetrahedral or square planar, and cis-trans isomerism only occurs in a square planar geometry.
But, from the question, we are informed that the complex does not exhibit cis-trans isomerism, therefore the complex must be tetrahedral.
Which of the following is an effect we can already observe on Earth that results for global warming?
stronger hurricanes
more severe wildfires
less sea ice in the Arctic in summertime
all of the above
Answer:
All of the above
Explanation:
Please help I'm so confused
Methylphenidate is used to treat ADHD (attention deficit hyperactivity disorder). A patient is prescribed two 10.1 mg Methylphenidate tablets each day. Methylphenidate patches release Methylphenidate into the body by absorption through the skin. The patches come with different amounts of Methylphenidate. The maximum amount of Methylphenidate in one brand of patch supplies a patient with 20. mg of Methylphenidate per day.
Determine the amount of Methylphenidate a patient may take using 2 tablets (in mg) Be sure your answer has the correct number of significant figures.
Answer:
They work by increasing activity in the brain, particularly in areas that help control attention and behaviour. Methylphenidate is used to treat children with attention deficit hyperactivity disorder (ADHD). It helps with hyperactivity and impulsive behaviour, and allows them to concentrate better.
Explanation:
Given BH3, O3, CO2, and NH3, which of these compound is an exception to the octet rules?
a. BH3
b. O3
c. NH3
d. CO2
Answer:
a. BH₃
Explanation:
According to the octet rules, atoms reach stability when are surrounded by eight electrons in their valence shell when they combine to form a chemical compound.
From the options, the only compound in which the central atom does not meet the octet rules is BH₃. The central atom is boron (B), which has 3 electrons in its valence shell. When B is combined with hydrogen (H), 3 electrons from the 3 atoms of H are added. The total amount of electrons is 6, fewer than 8 electrons needed to meet the rule.
The compound which is showing exception to the octet rules is BH₃.
What is octet rule?According to the octet rule in the outermost valence shell of any compound, eight electrons should present.
Among the given compounds only BH₃ will not satisfy the octet rule, as in the outermost shell of boron atom 3 electron are present following the electronic configuration 1s²,2s²2p¹ because its atomic number is 5. Now this boron atom will form bond with 3 hydrogen atoms and these hydrogen atoms will share 3 electrons to boron atom.
So, total electrons in the outer most shell of BH₃ compound is 3+3=6.
Hence, BH₃ is an exception of octet rule.
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How many grams of Kr are in a 9.59 L cylinder at 46.0 'C and 4.62 atm?
mass:
Answer:
Mass = 141.6 g
Explanation:
Given data:
Mass of Kr in gram = ?
Volume in L = 9.59 L
Temperature = 46.0°C
Pressure = 4.62 atm
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
46.0+273 = 319 K
4.62 atm × 9.59 L = n× 0.0821 atm.L/ mol.K ×319 K
44.3 atm.L = n×26.19 atm.L/ mol
n = 44.3 atm.L / 26.19 atm.L/ mol
n = 1.69 mol
Mass in gram:
Mass = number of moles × molar mass
Mass = 1.69 mol × 83.79 g/mol
Mass = 141.6 g
A container at STP contains 64.0O grams of oxygen. How many liters of O2(g) are in the container?
Answer:
44.80
Explanation:
The student puts a teaspoon (10 g) of C12H22O11 sugar in a cup of tea. How many sugar molecules does a student drink along with this tea?
Answer:
1.76 x 10²²molecucles
Explanation:
Given parameters:
Mass of the sugar C₁₂H₂₂O₁₁ = 10g
Unknown:
Number of molecules = ?
Solution:
The number of molecules can be determined if we find the number of moles first.
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of C₁₂H₂₂O₁₁ = 12(12) + 22(1) + 11(16) = 342g/mol
Number of moles = [tex]\frac{10}{342}[/tex] = 0.029mole
1 mole of C₁₂H₂₂O₁₁ will contain 6.02 x 10²³
0.029 mole of C₁₂H₂₂O₁₁ will be made up of 0.029 x 6.02 x 10²³
= 1.76 x 10²²molecucles
Glycogenolysis and gluconeogenesis occur in the liver due to the action of?
Glycogenolysis and Gluconeogenesis occur in the liver due to the action of Cortisol.
It is the process of storing excess glucose for body which can be used at later time. the glycogen stored by the liver is broken down to glucose and dispersed in the body.
Cortisol helps to decrease insulin and increase glucagon. glucagon is type of peptide hormone secreted by pancreatic cells to increase the process of gycogenolysis or gluconeogenis. it is the primary stress harmone which increases glucose(sugar) in blood.
Gluconeogesis ia that process which tansform non carbohydrate substrate like amino acid ,gycerol into glucose.
Thus, Glycogenolysis and Gluconeogenesis occur in the liver due to the action of Cortisol.
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How does the final paragraph relate to the main idea of the article? (4.03) science.
Answer:
Indicates the writer's stance on the main idea of a paragraph. The controlling idea appears in the paragraph's topic sentence. ... The final sentence of a paragraph that summarizes the topic sentence using different words. Words and phrases that show how the ideas in sentences and paragraphs are related.
Explanation:
HOPE THIS HELP
PICK ME AS THE BRAINLIEST
Answer:
he last paragraph relates to the main topic because the main topic is about cells and the last paragraph is saying how scientist are still discovering cells but the author says that the new cells are not listed in the article
Explanation:
i had a bad day i hope you have a good one -me ;
Describe the preparation
of 2.00h of o.108m Bach
from Bad. 28 (244-3 g/mal)
The question is incomplete, the complete question is; Describe the preparation of 2.00 L of 0.108 M BaCl2 from BaCl2.2H2O
Answer:
See explanation
Explanation:
First we must know the molar mass of the compound = 244.3 g/mol
Now we must calculate the number of moles of BaCl2.2H2O in the solution.
number of moles = concentration * volume = 0.108 M * 2.00 L = 0.216 moles
Now the mass of solid that we need to take can be obtained from;
number of moles = mass/molar mass
mass = number of moles * molar mass
mass = 0.216 moles * 244.3 g/mol
Mass = 52.8 g
Hence, we must weigh 52.8 g of BaCl2.2H2O accurately in a balance and dissolve it in 2 L of water to give 0.108 M solution of BaCl2.2H2O.
Lithium chloride crystallizes in a face-centered cubic unit cell with chloride ions occupying the lattice points and lithium ions occupying octahedral holes. How many chloride ions surround each lithium ion in LiCl?
Answer:
6
Explanation:
The coordination number of a particular crystal structure arrangement is defined as the number of nearest neighbor atoms or ions surrounding an atom or ion.
We must note that in salts of the type MX, the coordination number of each ion must be equal. The structure of LiCl is built by placing each unit cell next to another such that ions residing in the corner, edge or face sites are shared between adjacent unit cells. The LiCl is in FCC arrangement.
Hence in LiCl, each Li+ ion is surrounded by 6 chloride ions.