Answer:
6.13, 7.53, 8.13, 10.25, 12.24
Explanation:
Without any KOH, the pH can be calculated using an ICE table (initial, change, equilibrium). I will assume that the pka is 7.53 since that's the value that wikipedia gives
after setting up the table the equation left should be:
[tex]\frac{x^2}{0.19-x} = 2.95*10^{-8}[/tex] - original equation
the equation can be simplified to [tex]\frac{x^2}{0.19} = 2.95*10^{-8}[/tex] since if x is really small, (0.19-x) will be pretty much equal to 0.19
solve to get x = 7.49*10^-7, and since [tex]\frac{7.49*10^{-7}}{0.19}[/tex] is very small, we don't have to calculate x with the original equation instead of approximating it with the simplified equation
since x = [H3O+], -log(x) would give us the ph, so the pH would be
-log(7.49*10^-7) = pH = 6.13
For the other problems, calculate the number of moles of each of the components
in total, we have 0.05*0.19 moles of HClO, which is 0.0095 moles.
after adding 0.025*0.19 moles of KOH (0.00475 moles), there would be 0.0095-0.00475 moles of HClO left, and 0.00475 moles of ClO- would be generated. The concentrations of both ClO- and HClO are both about equal to 0.00475/0.075 (0.075 is the total amount of liquid after adding 25 ml of KOH). The fraction simplified to 0.0633
Using the equation
pH = pKa + log([A-]/[HA]), we would get pH = 7.53 + log(0.0633/0.0633)
so pH = 7.53 after 25 mls of KOH has been added
Do a similar thing for 40 mls of KOH being added.
pH = 7.53 + log(0.0844/0.0211) = pH = 8.13
For 50 mls, an ICE table needs to be used again since the moles of base and acid are roughly equal.
The resulting solution should be equal to adding
0.05*0.19 moles of KClO to water, which would be a 0.05*0.19/0.1 molar concentration, or 0.095M
Set up an equation and use ICE:
[tex]ClO^-+H2O = > HClO + OH^-[/tex]
the Kf of this equation can be calculated by rearranging this reaction and utilizing the equation for the auto-ionization of water
[tex]HClO + H2O = > H3O^+ + ClO^-[/tex] with a Ka of 2.95*10^-8
flip the reaction to get:
[tex]H3O^+ + ClO^- = > HClO + H2O[/tex] and the Ka is 1/(2.95*10^-8) , or 33898305.1
Use the equation:
[tex]2H_2O = > H_3O^+ + OH^- , \ \ \ \ K_w = 10^{-14}[/tex]
and add the equations
[tex]2H2O + H3O^+ + ClO^- = > HClO + H2O + H3O^+ + OH^-[/tex]
the K for this equation is just 33898305.1 times 10^-14
which is 3.39*10^-7
the equation can have terms present on both sides of the equation canceled out to get
[tex]ClO^-+H2O = > HClO + OH^-[/tex] with a K of 3.39*10^-7
Set up the ICE table once more, note that the ClO- concentration is 0.095
x^2/(0.095-x) = 3.39*10^-7
approximate the equation to be:
x^2/(0.095) = 3.39*10^-7
solve for x = 0.00017945 = [OH-]
the pOH would be 3.746, and since 14 = pH+pOH,
14 = pH + 3.746
pH = 10.25
For the final equation it is much simpler. Since the moles of strong base is more than the moles of acid, the pOH can be calculated by just taking the -log of the excess base, which is 0.01*0.19 moles, or 0.01*0.19/(0.11) molar solution
The concentration of OH is 0.01*0.19/(0.11), which is 0.0173.
-log(0.0173) = pOH
pOH = 1.76
pH = 1.76 = pH = 12.24
How would I go About solving this with a chart?
Atomic Structure - Dalton's Atomic Theory
From Dalton's experiments and observations, and from the work of some of his colleagues he proposed a new theory of the atom.
Answer:
For answering we will have to create a 5x3 table. It will have the following headings:
The information that has to go in the table is:
Dalton's Postulates
1.1:All matter is composed of extremely small particles called atoms.
2.1: Atoms of a given element are identical in size, mass, and other properties. Atoms of different elements differ in size, mass and other properties.
3.1: Atoms cannot be subdivided, created or distroyed.
4.1 Atoms of different elements can combine in simple whole number ratios to form chemical compounds.
5.1: In chemical reactions, atoms are combined, separated or rearranged.
Keep/Modify/Discard:
1.2:Keep
2.2:Modify
3.2:Modify
4.2:Keep
5.2:Keep
Rewrite in case of need:
1.3: No need
2.3: Atoms of different elements differ in size, mass and other properties. Atoms of a given element can also differ in mass.
3.3: Atoms can be further subdivided, and using nuclearfission and fussion techniques atoms can be created or destroyed by changing them into other atoms.
4.3:No need
5.3: No need
Which statement about subtatomic particles are true
The statement about sub-atomic particles that is true is:
Electrons are the subatomic particles with the smallest mass; option BWhat are sub-atomic particles?Sub-atomic particles refer to the smaller particles that are the constituents of atoms of elements.
There are three sub-atomic particles within a given atom,
The three sub-atomic particles are given below:
electrons -electrons are the negatively charged particles found outside the nucleus of an atom in electron shells or orbitals around the atom.protons - these are positively charged particles found inside the nucleus of an atom. The number of protons in an atom gives the atomic number of that atom.neutrons - these are neutral atoms found in the nucleus of atoms. The sum of the neutrons and protons in the nucleus of an atom gives the mass number of an atom. This is because the mass of an at is centered inside the nucleus since the proton and neutron have equal mass but the electron has negligible mass.Considering the given statements about the sub-atomic particles, the only true statement is that which describes the mass of the electron as being the smallest of the three sub-atomic particles.
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Complete question:
Which statement about subatomic particles is true?
Protons are the only subatomic particles to have a charge.
Electrons are the subatomic particles with the smallest mass.
Neutrons orbit the nucleus of the atom.
Subatomic particles all have the same mass
The term route of entry on an SDS refers to the way a _____ enters the body.
The term route of entry on an SDS refers to the way a chemicals enters the body
The Safety data sheet (SDS) means which refer to the very complete documents about the chemicals the written or printed material concerning a hazardous chemical that is prepared in accordance with the HCS and the means by which a material may gain access to the body and example is inhalation, ingestion, and skin contact and and routes on an SDS refers to the way enters the chemicals in the body
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What is the limiting reagent when 1.5 moles of nitrogen react with 6 moles of hydrogen? N2(g)+3H2(g)—> 2NH3(g)
Explanation
Given
N2(g)+3H2(g)—> 2NH3(g)
Number of moles of nitrogen = 1.5 moles
Number of moles of hydrogen = 6 moles
Required: Limiting reagent
Solution
For Nitrogen:
[tex]\begin{gathered} 1,5\text{ mol N x }\frac{2\text{ mol NH}_3}{1\text{ mol N}_2} \\ \\ Moles\text{ of NH}_3=3\text{ mol} \end{gathered}[/tex]For Hydrogen:
[tex]\begin{gathered} 6\text{ mol H x }\frac{2\text{ mol NH}_3}{3\text{ mol H}_2} \\ \\ Moles\text{ of NH}_3=\text{ 4 mol} \end{gathered}[/tex]The limiting reagent is Nitrogen, because less moles of NH3 will be produced by nitrogen, meaning it all of it gets used up.
Answer
The limiting reagent is Nitrogen.
When a 1.00 L sample of water from the surface of the Dead Sea (which is more than 400 meters below sea level and much saltier than ordinary seawater) is evaporated, 156 grams of MgCl₂ are recovered. What is the molarity of MgCl₂ in the original sample?
The What is the molarity of MgCl₂ in the original sample is 1.63 mol/L
[tex]Molarity = \frac{Mass\ of\ MgCl_2}{molar \ mass\ of MgCl_2} \times\frac{1}{volume \of \ the\ solution \ in\ litres}[/tex]
[tex]Molarity = \frac{156g}{95.211g/mol} \times\frac{1}{1L}\\\\Molarity = 1.63 \ mol/L[/tex]
What is molarity ?Molarity (M) is the amount of a substance in a certain volume of solution. Molar concentration is a measure of the concentration of chemical compounds, especially a solute in a solution, as the amount of the substance per unit volume of the solution. In chemistry, the most commonly used unit of molarity is the number of moles per litter, indicated in the SI unit mol/L or mol/dm³.
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Lab: Newton's Laws of Motion
Does anyone have the answers to these?
Newton's laws of motion the answers to these is an object will not change its motion unless a force acts on it
In the first law an object will not change its motion unless a force acts on it and in the second law, the force on an object is equal to its mass times its acceleration and in the third law when two objects interact they apply forces to each other of equal magnitude and opposite direction and newton's second law is a quantitative description of the changes that a force can produce on the motion of a body and it states that the time rate of change of the momentum of a body is equal in both magnitude and direction to the force imposed on it
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help me pls Thank you if you do
We can say that Javier is right because the reactivity of the elements tends to decrease from left to right.
What is the periodic table?The periodic table is an arrangement of the elements in order of increasing atomic number. Let us note that the modern periodic law states that the properties of the elements is a periodic function of their atomic numbers .Thus the atomic numbers of the elements tends to increase from left to right in the periodic table as we can see in the image that have been attached to the question above.
Now, we know that the reactivity of the elements also tend to decrease from left to right. This is because, the heavier the element, the less reactive that the element is. Recall that every period that we can find in the periodic table tends to end up with a non reactive noble gas element.
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Pablo knows that NaCl dissolves in water and that elements in the same group of the Periodic Table often have similar chemical properties. He develops a hypothesis that states: All chloride salts of group I metals are soluble in water.
He proposes to test his theory by taking a small sample of each type of salt and stirring it into a beaker of water.
What will he observe if his prediction is true?
A.
Each of the solid salts will produce bubbles when mixed with the liquid water.
B.
Each mixture of salt and water will become a different color.
C.
At least some of the solid added will cease to be visible at the bottom of each beaker.
D.
After they are stirred, each of the beakers will each feel hot to the touch.
A small sample of chloride salts of group I metals on stirring with water on a beaker, at least some of the solid added will cease to be visible at the bottom of each beaker.
Group I elements are Hydrogen, Lithium, Sodium, Potassium, Rubidium, Cesium and Francium.
When chloride salts of these elements where dissolved in water it would not produce bubbles or change colour.
In addition to that, not all salts would feel hot to touch when the beaker in which the salt was dissolved is touched. Some would feel cool. This is because of difference in the process happening between the salt and water. For example: HCl would release heat when dissolved in water – Exothermic reaction (Beaker would be hot to touch) whereas KCl would absorb heat when dissolved in water – Endothermic reaction (Beaker would be cool to touch).
One common thing about chloride salts of group I elements is that they all dissolve in water. The bond between the elements and the chloride is Ionic in nature. In the water, the bond between the molecules is covalent. The covalent bonds are stronger than ionic bonds. Thus, ionic bonds dissociate and covalent bonds would be formed with water and dissociated ions i.e., chloride salts are dissolved in water. When this happens, solid would cease to be visible at the bottom of each beaker.
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A 0.15M solution of methylamine CH3NH2 contains an unknown concentration of methylamine chloride CH3NH3Cl. If the solution has a pH of 10.20,what is the concentration of methylamine chloride in the solution? Kb for methylamine=4.6*10^-4
Answer:
0.43 M
Explanation:
The equation that should be used in this case would be:
pOH = pKb + log([A+]/[Base])
pKb = -log (4.6*10^-4) = 3.34
pOH = 14-10.2 = 3.8
[Base] = 0.15
3.8 = 3.34 + log x/0.15
0.46=log x/0.15
10^(0.46) = x/.15
x = 10^(0.46) * 0.15 = 0.43 M
When cirrus clouds are above a deck of altocumulus clouds, occasionally a clear area, or “hole” will appear in the altocumulus cloud layer. What do you suppose cloud cause this to happen?
When cirrus clouds are above a deck of altocumulus clouds, occasionally a clear area, or “hole” will appear in the altocumulus cloud layer which is caused by supercooled water in the clouds suddenly evaporating.
What is a Cloud?This is referred to as a mass of condensed watery vapor which are floating in the atmosphere and results in precipitation due to continued condensation in the form of rain, snow etc.
There are different types of clouds and in a scenario where a clear area, or “hole” will appear in the altocumulus cloud layer then it is as a result of the supercooled water in the clouds suddenly evaporating and creating the space seen or observed.
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How many atoms of lithium are in 1.00 g?
Answer: 8.604 x1022 atoms
Explanation:
A 68.0 mL portion of a 1.50 M solution is diluted to a total volume of 208 mL. A 104 mL portion of that solution is diluted by adding 161 mL of water. What is the final concentration? Assume the volumes are additive.
Taking into account the definition of dilution, after two dilutions the final concentration is 0.1923 M.
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution. This is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeFinal concentrationIn this case, you know for the first dilution:
Ci= 1.50 MVi= 68 mLCf= ?Vf= 208 mLReplacing in the definition of dilution:
1.50 M× 68 mL= Cf× 208 mL
Solving:
(1.50 M× 68 mL)÷ 208 mL= Cf
0.49 M= Cf
Now, in a second dilution you take a sample of 104 mL of this diluted solution and add another 161 mL of water. The final volume of the solution will be
Vfinal= 104 mL + 161 mL= 265 mL
The concentration of the 104 mL sample is equal to the concentration of the first diluted solution, this is 0.49 M. Therefore, the concentration of the final solution will be:
0.49 M× 104 mL= Cf× 265 mL
Solving:
(0.49 M× 104 mL)÷ 265 mL= Cf
0.1923 M= Cf
In summary, the final concentration is 0.1923 M.
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Between Ar and H2O ( vapor) which gas deviates from ideal behavior and why? Justify your answer
Answer:
H2O
Explanation:
H2O should deviate from ideal behavior the most. Remember that an ideal gas has molecules which don't interact. Argon exists as an monoatomic element in the gas state, and the atom is neutral throughout. This means that two argon atoms only interact with each other through London dispersion forces or bumping. However, water is polar, so water molecules will attract each other strongly through permanent dipole-dipole interactions and hydrogen bonding. This means that water vapor deviates from ideal behavior the most
Question 2 of 10
Which type of model is described below?
Air flowing over an airplane's wing can be thought of as a river flowing around
a rock.
A. Conceptual
OB. Atomic
C. Mathematical
D. Physical
SUBMIT
Air flowing over an airplane's wing can be thought of as a river flowing around a rock Conceptual. Option A.
Air moves around the wing at about 100 knots. Slightly faster based on the profile. However, if you measure the airspeed within 1 inch of the wing surface, you'll find that the airflow slows down. When it reaches the surface of the wing, the velocity of the airflow is zero. Bernoulli's Principle helps explain how the shape of a wing gives an airplane lift.
They are shaped so that the airflow is faster at the top of the wing and slower at the bottom. Fast-moving air corresponds to low pressure, and slow-moving air corresponds to high pressure. The wing is shaped and raked so that the air moving over it moves faster than the air moving underneath. As the airspeed increases, its pressure decreases. So fast-moving air at the top exerts less pressure on the wing than slower-moving air at the bottom. The result is a wing thrust upward lift.
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Patient #5: What is the density if the length of the diaphysis sample is 8.0cm, the diameter is 3.0cm and the mass of the sample is 41g?
The density of a substance is calculated by taking the ratio of its mass and volume. The density of the diaphysis sample with a mass of 41 g is 0.725 g/cm³.
What is density?Density is measure of mass of a substance per unit volume. Thus, mathematically it is mass divided by volume. Density of a substance is dependant on molecular weight, volume, temperature and bond type also.
Density of a substance may change with temperature. For example, the density if water is 1 g/L but it changes to maximum 4° C. A diaphysis sample is cylindrical in shape and have a volume of πr²l where r is the radius and l be the length.
The volume of the diaphysis with a length of 8 cm and radius of 1.5 cm is calculated as follows:
Volume = πr²l
= 3.14 × (1.5 cm)² × 8 cm
= 56.52 cm³.
The density of the sample can be calculated by dividing the mass by volume as follows:
Density = mass / volume
= 41 g/ 56.52 cm³
= 0.725 g/cm³
Therefore, the density of the diaphysis sample is 0.725 g/cm³.
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In three to five sentences, describe how the diagram of Earth’s carbon cycle demonstrates the interactions among the biosphere (plants), the lithosphere (ground), the atmosphere (air), and the hydrosphere (water).
Based on the diagram of the carbon cycle given:
Carbon is cycled between the biosphere and plants during the processes of photosynthesis.Carbon is cycled between the biosphere and lithosphere during the death and decay of organismsCarbon is cycled between the biosphere and the hydrosphere di=uring the ocean uptake of carbon from respiring plantsCarbon is cycled between the lithosphere ad the atmosphere during the burning of fossil fuels.What is the carbon cycle?The carbon cycle is a cycle that describes the processes by which carbon is recycled between the various living and non-living components of the earth.
Carbon is an essential element required by all living organisms for their growth and development.
Also, carbon is found as part of the component of the non-living environment.
There, it is important that carbon is cycled between the various spheres of the earth.
Carbon is cycled between the biosphere (plants), the lithosphere (ground), the atmosphere (air), and the hydrosphere (water).
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if you start the reaction with 10 g of plantinum, 180 mL of 5 M HCL, and 223 mL of 6.55 M HNO3, how much H2PtCl6 would be formed
A reaction that starts with 10 g platinum, 180 mL 5 M HCl, and 223 mL 6.55 m [tex]HNO_3[/tex] will produce 20.9 grams of [tex]H_2PtCl_6[/tex].
Stoichiometric problemFirst, let's look at the equation of the reaction:
[tex]3 Pt + 4 HNO_3 + 18 HCl -- > 3 H_2[PtCl_6] + 4 NO + 8 H_2O[/tex]
The mole ratio of Pt, [tex]HNO_3[/tex], and HCl from the balanced equation of the reaction is 3:4:18.
Mole of 10 g platinum = 10/195
= 0.051
Mole of 180 mL, 5 M HCl = 180/1000 x 5
= 0.9 moles
Mole of 223 mL, 6.55 M [tex]HNO_3[/tex] = 223/1000 x 6.55
= 1.46 moles
Considering the mole ratio, HCl seems to be in excess while both platinum and [tex]HNO_3[/tex] are limiting.
Mole ratio of platinum and [tex]H_2PtCl_6[/tex] = 1:1
Equivalent mole of [tex]H_2PtCl_6[/tex] that is produced = 0.051 moles.
Mass of 0.051 mole platinum = 0.051 x 409.81
= 20.9 grams
Thus, the amount of [tex]H_2PtCl_6[/tex] that would be formed is 20.9 grams.
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How many moles of potassium nitrate are produced at the same time 4.4 moles of aluminum phosphate are produced? Can you show steps for answer
Moles of potassium nitrate are produced at the same time 4.4 moles of aluminum phosphate are produced is 28.63 mole
Potassium nitrate is an inorganic salt with a chemical formula of KNO₃ it is a natural source of nitrate and has been used as a constituent for several different purposes including food preservatives, fertilizers, tree stump removal, rocket propellants, and fireworks
Here given data is
4.4 moles of aluminum phosphate
We have to find moles of potassium nitrate =?
Number of mole = mass of substances/mass of one mole
Number of mole = 126/ 4.4 moles
Number of mole = 28.63mole
So, 28.63 mole potassium nitrate are produced at the same time 4.4 moles of aluminum phosphate are produced
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Aerosol cans carry clear warnings against incineration because of the high pressures that can develop upon heating. Suppose that a can contains a residual amount of gas at a pressure of 770 Torr and a temperature of 15 ∘C . What would the pressure be if the can were heated to 1235 ∘C ?
The new pressure when the can is heated to 1235 °C is 4031.8 torr
How to determine the pressurewe'llbegin by listing out the parameters obtained from the question. This is given below:
Initial pressure (P₁) = 770 torrInitial temperature (T₁) = 15 °C = 15 + 273 = 288 K New temperature (T₂) = 1235 °C = 1235 + 273 = 1508 KVolume = ConstantNew pressure (P₂) = ?The new pressure can be obtained as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
Volume = contant
P₁ / T₁ = P₂ / T₂
770 / 288 = P₂ / 1508
Cross multiply
P₂ × 288 = 770 × 1508
P₂ × 288 = 1161160
Divide both sides by 288
P₂ = 1161160 / 288
P₂ = 4031.8 torr
Thus, the pressure of the can is 4031.8 torr
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The concentration of glucose (molar mass 180 g/mol) in the fluid of the spine is 75 mg / 100g of water. What is the molal concentration?
Considering the definition of molal concentration, the molal concentration of glucose is 0.004166 moles/kg.
Molal concentration or molalityMolality or molar concentration is a way of measuring the concentration of solute in solvent, that is, the number of moles of solute present in the solvent.
Molality is defined as the moles of a solute per kilogram of solvent.
The Molality of a solution is determined by the expression:
molality= number of moles of solute÷ kilogram of solvent
Molala concentration in this caseIn this case, you know:
Molar mass of glucose= 180 g/molConcentration of glucose= 75 mg/ 100 g of waterMass of glucose= 75 mg= 0.075 g (being 1 mg= 0.001 g) Number of moles of solute= Mass of glucose÷ Molar mass of glucose= 0.0004166 molesMass of solvent = Mass of water= 100 g= 0.1 kg (being 1000 g= 1 kg)Replacing in the definition of molal concentration:
molality= 0.0004166 moles÷ 0.1 kg
molality= 0.004166 moles/kg
Finally, the molal concentration in this case is 0.004166 moles/kg.
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What mass of Mg will be produced when 126.9 g of K are reacted?
The balanced reaction is MgCl2 + 2K --> 2KCl + Mg
how many sublevels in n=7
Answer:
7 sublevels (i think)
Explanation:
i will assume n is the principle quantum number, so the sublevels is l.
l can equal 0, 1, 2... all the way up to n-1, in this case, 7-1, or 6
This means the sublevels are:
0,1,2,3,4,5,6, for a total of 7 sublevels
Convert
7.4 x 10e28 cg/L to Mg/mL
The unit of the density of the substance from cg/L to mg/mL is 7.4 x 10²⁶ mg/mL.
What is unit conversion?
Unit conversion is a method or a way of converting a given quantity from one unit to another.
The density of a substance can be measured in different units as shown blow;
kg/m³g/cm³cg/Lmg/ml, etcThe density of the substance can be converted to the required unit as shown below.
7.4 x 10²⁸ cg/L to mg/ml
= (7.4 x 10²⁸ cg/L) x (10 mg/cg) x (1 L / 1000 mL)
= 7.4 x 10²⁶ mg/mL
Thus, the unit of the density can be converted from centigram per liter to milligram per milliliter.
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A student is doing an investigation with solids, liquids, and gases. They put each substance into a large syringe and press down. The
student is not able to compress the solid or the liquid into a smaller volume. When they get to the gas, they notice that it will compress
into a smaller volume. Why are gases more compressible than liquids and solids? 100 points
Suppose you identify a new element, Interactium. Interactium has three isotopes: Interactium-283, Interactium-286, and Interactium-292. In the mixture, 22% of the mixture is Interactium-283, 35% is Interactium-286, and the rest of the mixture is Interactium-292.
What is the relative atomic mass for Interactium?
The relative atomic mass of the interactium, give the data is 287.92 amu
How to determine the relative atomic massThe relative atomic mass of the interactium can be obtained as illustrated below:
Mass of isotope A (Interactium-283) = 283Abundance of A (A%) = 22%Mass of isotope B (Interactium-286)= 286Abundance of B (B%) = 35%Mass of isotope C (Interactium-292)= 292Abundance of C (B%) = 100 - (22 + 35) = 43%Relative atomic mass =?Relative atomic mass = [(Mass of A × A%) / 100] + [(Mass of B × B%) / 100] + [(Mass of C × C%) / 100] +
Relative atomic mass = [(283 × 22) / 100] + [(286 × 35) / 100] + [(292 × 43) / 100]
Relative atomic mass = 62.26 + 100.1 + 125.56
Relative atomic mass = 287.92 amu
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ANSWER THE FOLLOWING:
Need of help!!
The U.S. penny has a diameter of 1.905 cm. The densities of copper and zinc are 8.96 g/cm^3 and 7.14 g/cm^3, respectively.
1. Between 1944 and 1982, the penny was made of a brass alloy that is 95% copper and 5% zinc by mass. If the mass of the penny was 3.09 g, find the volume (in cm^3) and thickness (in cm) of the penny in mm. (Assume the penny is a cylinder, V = π r^2 h)
Based on the mass composition of the penny:
the volume of the penny is 0.35 cm³the thickness of the penny is 0.12 cm\What is the density of the penny that was made of a brass alloy that is 95% copper and 5% zinc by mass?The density of the penny that was made of a brass alloy that is 95% copper and 5% zinc by mass is calculated as follows:
Density of penny = % mass of Cu * density of Cu + % mass of Zn * density of ZnThe densities of copper and zinc are 8.96 g/cm³ and 7.14 g/cm³, respectively.
Density of Penny = 95% * 8.96 + 5% * 7.14
Density of penny = 8.87 g/cm³
The volume of the penny will then be;
Volume = mass / densityvolume of penny = 3.09 / 8..87
volume of the penny = 0.35 cm³
The thickness of the penny will then be;
radius of the penny = 0.95 cm
thickness of the penny = v / π r²
thickness of the penny = 0.35 / 3.142 * 0.95²
thickness of the penny = 0.12 cm
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Solve the following calculations:
Calculation also includes applying logic to a non-numerical issue. Exponentiation comes first, followed by multiplication and division, and then addition and subtraction, as is the case for each mathematical equation.
What is meant by calculation?
A computation is a methodical, well-thought-out process. Calculating the solution to a math problem is the first type of calculation, for which you might use a calculator. Calculation also includes applying logic to a non-numerical issue.
Exponentiation comes first, followed by multiplication and division, and then addition and subtraction, as is the case for each mathematical equation.
1 km = 1000 m; 1 hr = 3600 sec.
[1 km/hr = 1000/3600 m/sec = 5/18 m/sec
To convert km/hr into m/sec, multiply the number by 5 and then divide it by 18.]
83km.h-1 = 83 × 5/18 = 23.05
= 23 m.s-1
83 km.h-1 + 83 m.s-1 = 23 m.s-1 + 83 m.s-1
= 106 m.s-1
Therefore, the correct answer is 106 m.s-1.
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Write a balanced equation for the complete oxidation reaction that occurs when ethylene (C2H4) burns in air.
C2H4 + 3O2 ---> 2CO2 + 2H2O
At 30°F and atmospheric pressure, water?
A. sublimes. B. melts. C. freezes. D. deposits. E. boils.
The correct answer is to freeze. Option C.
This diffusion effect of water molecules during freezing means that applying pressure to water also lowers its freezing point. With enough pressure which makes it difficult for water molecules to spread out into the solid structure, liquid water is a few degrees below zero degrees Celsius.
When water is placed in a vacuum it freezes slower or faster than water placed in a container or freezer at normal atmospheric pressure. Atmospheric pressure does affect the freezing temperature. The higher the pressure the lower the freezing temperature. For water stored in a tank, its bottom pressure is the weight acting on a unit area of the surface on which the tank is stored.
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