Answer:
PVT upon t is equal to k p is equal to k p v is equal to k p upon t is equal to K2
Explanation:
correct answer is d
The measurement that is listen in proper mathematical relationship is PV=K and V/T =K. Option B and D are correct.
Boyle’s law derived the conditions of the sample of a gas in two different conditional pressure and volume. The initial observation was that the product of a given pressure and volume for the sample of gas at a constant temperature is observed to be constant.
Therefore,
PV= constant
PV=K
The two temperature conditions were thus observed and the equation was elaborated to be,
P₁V₁=P₂V₂
On the other hand, Charle's law state that the volume of a fixed mass of a gas is directly proportional to it's absolute temperature, provided that the pressure remains constant. It is represented as V/T =K
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How much heat (in kJ k J ) is evolved in converting 2.00 mol m o l of steam at 135 ∘C ∘ C to ice at -42 ∘C ∘ C ? The heat capacity of steam is 2.01 J/(g⋅∘C) J / ( g ⋅ ∘ C ) , and that one of ice is 2.09 J/(g⋅∘C) J / ( g ⋅ ∘ C ) .
The total quantity of heat evolved in converting the steam to ice is determined as -12,928.68 J.
Heat evolved in converting the steam to ice
The total heat evolved is calculated as follows;
Q(tot) = Q1(steam to boiling point) + Q2(boiling point to ice) +Q3(freezing to -42 ⁰C)
where;
Q is heat evolvedQ = = mcΔθ
where;
m is mass, (mass of water = 18 g/mol)c is specific heat capacity, Δθ is change in temperatureQ(tot) = 2(18)(2.01)(100 - 135) + 2(18)(2.01)(0 - 100) + 2(18)(2.09)(-42 - 0)
Q(tot) = -12,928.68 J
Thus, the total quantity of heat evolved in converting the steam to ice is determined as -12,928.68 J.
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(1) (a) In an equilibrium reaction between gases Q2 and R2 to form QR, the energy content of the reactants is 100KJ and that of the product is 54KJ. The energy content of the activated complex is 210KJ. (i) Draw an energy profile diagram for the reaction. (ii) Determine the: I. activation energy of the reaction. II. enthalpy change A H of the reaction. (iii) Write a balanced equation for the reaction. (iv) State whether the reaction is exothermic or endothermic. (v) Give a reason for the answer given in 1(a)(iv). (b) (i) If sodium reacts with cold water, state ONE observation that would be made as the reaction Proceeds. (ii) Write a balanced chemical equation for the reaction in 1(a)(i) (iii) Calculate the volume of gas produced at s.t.p if 3.0g of sodium reacts with excess water. [Molar volume of gas at s.t.p = 22.4dm³; H = 1.0, O=16.0, Na = 23.0] (c) Name ONE allotrope of oxygen.
Answer:
a is my answer
Explanation:
Compare the concentration of 1 mol of NaCl and 1 mol of MgSO4 ?
The molarity of the NaCl and [tex]MgSO_4[/tex] will be the same.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
1 mol of NaCl in 1 litre of solution gives 1 M.
1 mol of [tex]MgSO_4[/tex] in 1 litre of solution gives 1 M.
Hence, the molarity of the NaCl and [tex]MgSO_4[/tex] will be the same.
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magenesuim 48.6g + oxygen 32.0 g = magenesuim oxide 80.6 g what is the mass of reactant
Answer:
2Mg+O=2MgO
Explanation:
32gram of reacting
Two bonding pairs around a central atom results in a ________.
A. tetrahedral compound
B. linear compound
C. trigonal bipyramid
D. octahedral
Answer:
The asnwer to your question is A. tetrahedral compound
Explanation:
A tetrahedral is an object that has a central atom surrounded by four other atoms.
Linear chain compounds are materials composed of one-dimensional arrays of metal-metal bonded molecules or ions.
A trigonal bipyramid formation is a molecular geometry with one atom at the center and 5 more atoms at the corners of a triangular bipyramid.
An octahedron is a polyhedron with eight faces. The term is most commonly used to refer to the regular octahedron, a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex.
I hope this helps and have a good day!
The activation energy of a first order reaction is 83.5kj/mol. the rate constant is 3.54x10^-5s^-1 at 45 c. what is the rate constant at 65 c?
Rate constant:
The rate constant at 65°C is [tex]k_{2} = 3.069 x 10^{-6}[/tex]
What is the Arrhenius equation?
Sometimes the Arrhenius equation is written as [tex]k = Ae^{-E/RT}[/tex], where k is the rate of the chemical reaction, A is a constant that varies depending on the chemicals involved, E is the activation energy, and R is the universal gas constant, and T is the temperature.
According to the exponential part in the Arrhenius equation, a reaction's rate constant rises exponentially as the activation energy falls. The rate also grows exponentially because the rate of a reaction is precisely proportional to its rate constant.
Calculation:
According to the Arrhenius equation for variable temperature:
[tex]ln(\frac{k2}{k1}) = - \frac{Ea}{R} (\frac{1}{T2} - \frac{1}{T1})[/tex]
The temperatures are given to be computed in kelvins and then both temperature and activation energy will be put in the above equation, we get,
[tex]ln ( \frac{k_{2}}{3.54 x 10^{-5}} ) = -\frac{89000J/mol}{8.314J (mol* K)} ( \frac{1}{338.15K} - \frac{1}{318.15K} \\ln ( \frac{k_{2}}{3.54 x 10^{-5}} ) = 2.1602\\k_{2} = 3.54 x 10^{-5} *exp(2.1602)\\k_{2} = 3.54 x 10^{-5} *8.67\\ k_{2} = 30.69 x 10^{-5}\\k_{2} = 3.069 x 10^{-6}[/tex]
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The molecule CH3-CH2-CH2-CH2-CH2-CH2-CH3CH3-CH2-CH2-CH2-CH2-CH2-CH3 is best described as a(n) ________.
The given molecule is best described as an organic compound especially an alkane.
What are organic compounds?The organic compounds are those chemical compounds which has carbon-carbon or carbon-hydrogen bonds.
Some of the organic compounds are Carbohydrates, lipids, proteins, nucleic acids etc.
What are alkanes?Alkanes are organic compounds that has straight chain or linear chain between carbon atoms. That is there will be single bonded carbon atoms in the alkanes. So, these are also called saturated compounds.
The general formula for these compounds is CₙH₂ₙ₊₂.
The general formula for the given molecule is C₇H₁₆.
Therefore, the given molecule is best described as an organic compound or as an alkane.
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Put 10 milliliters of distilled water into a second test tube. Label it test tube 2, and place it in the rack. 2. Record the temperature of the water. 3. Measure 2.00 grams of anhydrous copper(II) sulfate (white powder) into a weighing boat. 4. Pour the anhydrous copper(II) sulfate into test tube 2. 5. Measure the final temperature of the solution in test tube 2. Watch the thermometer for a couple minutes, and record the highest temperature it reaches. 6. Calculate the change in temperature. What is the initial temperature in Celsius? What is the final temperature in Celsius?
The reaction is an exothermic reaction and the temperature change is calculated using the formula below:
Change in temperature = final temperature - initial temperatureWhat kind of heat change occurs when anhydrous copper(II) sulfate is dissolved in water?When, anhydrous copper(II) sulfate is dissolved in water, heat is given off to the surroundings and the temperature of the solution formed is higher than the temperature of the water used in dissolving it.
This type of reaction is known as an exothermic reaction.
The temperature increase is calculated using the formula below:
Change in temperature = final temperature - initial temperatureIn conclusion, exothermic reactions result in increase in temperature of their surroundings.
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Answer:my answer
Explanation:
Ethanol is highly toxic if it is consumed in large quantities. Although it is the second least toxic of the five alcohols discussed in this case, the ingestion of large quantities of ethanol is not safe. One serious problem with ethanol consumption is how the quantity is conveyed to the consumer. For example, American malt liquor can be sold in 23.5 fl. oz. (695 mL) cans and is 12% volume per volume (v/v) ethanol. Although these cans are labeled as containing multiple servings, many young people consider one can to be a single serving. Drinking two cans of this beverage can result in an accidental overdose of ethanol. Two cans may not seem like much until you do the math. In the previous question, you determined that the total volume of pure ethanol in a 695 mL can of American malt liquor is 83.4 mL. To better understand its significance, consider how this volume of ethanol compares with other alcoholic beverages. Calculate the total volume of ethanol in a standard 25.4 fl. oz (750 mL) bottle of liquor (e.g., whiskey, vodka, rum, etc.), which is typically 40% (v/v) ethanol. Enter your answer in milliliters. pure ethanol in liquor: mL Now calculate the total volume of ethanol in a typical 12 fl. oz (354.8 mL) can of light beer, which is 4% (v/v) ethanol. Enter your answer in milliliters. pure ethanol in light beer:
A significant MOE exists compared to developmental toxicity effect levels.
Blood alcohol levels from ABHS approximate consumption of non-alcoholic beverages.
No significant risk of developmental toxicity is expected from ABHS use.
Ethanol-based topical antiseptic hand rubs, commonly referred to as alcohol-based hand sanitizers (ABHS), are routinely used as the standard of care to reduce the presence of viable bacteria on the skin and are an important element of infection control procedures in the healthcare industry.
There are no reported indications of safety concerns associated with the use of these products in the workplace. However, the prevalence of such alcohol-based products in healthcare facilities and safety questions raised by the U.S. FDA led us to assess the potential for developmental toxicity under relevant product-use scenarios.
Estimates from a physiologically based pharmacokinetic modeling approach suggest that occupational use of alcohol-based topical antiseptics in the healthcare industry can generate low, detectable concentrations of ethanol in blood.
This unintended systemic dose probably reflects contributions from both dermal absorption and inhalation of the volatilized product.
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i think it’s b, true, & false. anyone confirm?? pls
Answer:
which question is it for
there are 3.0 x 10^22 molecules of sucrose in a sample. how many grams of sucrose is this? The molar mass of C12H22O11 is about 342 g
The amount of sucrose in the sample would be 17 grams
Number of molecules of substancesThere are 6.022 x [tex]10^{23}[/tex] molecules in 1 mole of every substance.
3.0 x [tex]10^2^2[/tex] molecules will, therefore, be:
1 x 3.0 x [tex]10^2^2[/tex]/6.022 x [tex]10^{23}[/tex] = 0.0498 moles
Mass of 0.0498 moles sucrose = 0.0498 x 342 = 17 grams
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How many grams of carbon are contained in one mole of C3H8? (Report your
answer to two places past the decimal point. Moodle is looking for a number
only, no units.)
Considering the definition of molar mass, the mass of one mole of C₃H₈ is 44 grams.
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.
Molar mass of C₃H₈In this case, you know the molar mass of the elements is:
C= 12 g/mole
H= 1 g/mole
So, the molar mass of the compound C₃H₈ is calculated as:
C₃H₈ = 3 ×12 g/mole + 8 ×1 g/mole
Solving:
C₃H₈ = 44 g/mole
Finally, the mass of one mole of C₃H₈ is 44 grams.
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You are asked to make 500 mL of a 1.2% (w/v) agarose solution. How much grams of agarose must you weigh out to make this
The grams of agarose that are weighed out are 6 g.
The concentration of a solution is expressed in a number of ways like molarity, molality, normality. It is also expressed as w/v, w/w, and v/v.
In w/v, the w represents the weight of the solute and v is the volume of the solution.
w/v = Mass of the solute/volume of the solution
Calculations:
It is given that w/v is 1.2%. This means that 1.2 g of agarose is present in 100 mL of the solution or 1.2 g/100 mL.
The weight of agarose present in 500 mL of the solution is calculated as:
Mass of agarose = (1.2 g/100 mL) x 500 mL
= 6 g
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In the reaction C+0₂ → CO₂ which element is reduced in the reaction?
O C
O 0₂
O CO₂
Answer:
O2(oxygen)
Explanation:
Reduced means the valence electrons are gained. From this equation we see in CO2, C is 4+ and for each O there's a 2-, however, originally, C and O2 are all 0, it's obvious that O is reduced from 0 to 2-
141 ml of 1.2 m aluminum nitrate is mixed with 85 ml of 0.27 m sodium carbonate
Based on the mole ratio of the reaction:
Moles of aluminum carbonate produced = 0.00765 molesMoles of sodium nitrate produced = 0.02295 moles.What is the mole ratio of the reaction between aluminum nitrate and sodium carbonate?The mole ratio of the reaction is given by the equation of reaction as follows:
[tex]2\:Al(NO_{3})_{3} + 3\:Na_{2}CO_{3} \rightarrow Al_{2}(CO_{3})_{3} + 3\:NaNO_{3}[/tex]
The mole ratio of the products and reactants are used to determine the amount of product
Moles of aluminum nitrate reacting = 141/1000 * 1.2 M = 0.1692 moles
Moles of sodium carbonate reacting = 85/1000 * 0.27 = 0.02295 moles
Based on the mole ratio, sodium carbonate is the limiting reactant.
Moles of aluminum carbonate produced = 0.02295 * 1/3 = 0.00765 moles
Moles of sodium nitrate produced = 0.02295 * 3/3 = 0.02295 moles.
Therefore, the moles of the products aluminum carbonate and sodium nitrate produced is determined from the mole ratio of the reaction.
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A certain first-order reaction a → b is 25% complete in 42 min at 25°c. What is the half-life of the reaction?.
Half life of the reaction is :-101.9 min
a→b
25% reacted means 75% remains
t=42 min
Rate constant
k=(2.303/t)(log a/a-x)
k=(2.303/42)(log 100/100-25 )
k=(0.054) (log 100/75)
k=(0.054)(0.1249)
k=0.0068per min
half life
t1/2=(0.693/k)
=(0.693/0.0068)
=101.9 min
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will the shielding effect be more noticeable in metals or nonmetals? explain your answer.
The shielding effect is more noticeable in metals than non-metals.
What is shielding effect?
The shielding effect is known as a decrease in the effective nuclear charge on the electron cloud as a result of a variation in the attraction forces acting on the atom's electrons.
Why shielding effect is strong in metals?
Metals will have a more pronounced shielding effect as compared to nonmetals during the same time span. The amount of p+ atoms in the nucleus grows as you advance across the periodic table, raising the nuclear charge of the atom. Because the valence e- are drawn more firmly towards the nucleus in nonmetals, the inner core's shielding action is less obvious.
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CH3CH2OH+3O2 2CO2+3H20 ( ethanol) explain this equation! if u didn't understand the wat I have written could u text in personal will sent u photo of questions
The equation is given is of combustion of ethanol.
Fuel ethanol (C2H5OH) has high energy carbon-carbon (C-C) and carbon-hydrogen (C-H) bonds that store chemical energy. From the ethanol container, ethanol molecules evaporating, enter the flame's base. A physical action called evaporation converts liquid into gas. Ethanol evaporates with a constant molecular structure.
The molecules of ethanol and oxygen combine inside the flame and undergo a chemical transformation. Let's consider matter, or the atoms. The oxygen (O2) and ethanol (C2H5OH) molecules' atoms reorganise into carbon dioxide (CO2) and water (H2O). There are always the same number of atoms. A chemical equation may be used to demonstrate how the atoms are rearranged.
Energy is released as the atoms in the oxygen and ethanol are rearranged. When the high-energy C-C and C-H bonds in ethanol are swapped out for the low-energy H-O and C=O bonds in carbon dioxide and water, chemical energy is released as heat and light.
The ethanol and oxygen atoms are rearranged into carbon dioxide and water during burning. Water and carbon dioxide escape from the flame's top.
To conclude with we can say that the given reaction of combustion of ethanol. Ethanol with oxygen given carbon dioxide with water on reaction.
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A certain first-order reaction a → b is 25% complete in 42 min at 25°c. What is the half-life of the reaction?.
The half-life of the reaction is 101.9 min
First order reactionWhen a reaction's pace and reactant concentration are inversely correlated, the process is known as a first-order reaction. To put it another way, the reaction rate doubles when the concentration does. One or two reactants can be present in a first-order reaction, as in the case of the decomposition process.
The half-life of first-order reaction:-The amount of time it takes for the initial concentration of the reactant(s) to decrease by half is known as the half-life of a chemical reaction (abbreviated as "t1/2").
Calculation:-a→b
25% reacted means 75% remains
t=42 min
Rate constant
k=(2.303/t)(log a/a-x)
k=(2.303/42)(log 100/100-25 )
k=(0.054) (log 100/75)
k=(0.054)(0.1249)
k=0.0068 per min
half life
t1/2=(0.693/k)
=(0.693/0.0068)
=101.9 min
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When a neon atom is electrified, electrons jump to higher orbits. One of the electrons falls from an outside orbit to an inside orbit, giving off red light with a wavelength of 6.34 x 10^–7m. Calculate the frequency of the red light given off by the neon atom.
Find the energy of a photon of light if the wavelength of the light wave is 4.65 x 10^–7m.
An automobile has a wavelength that is not measurable by human standards. If the car has a mass of 2000 lbs (905 kg) and travels at 30 miles/hr (26.8 m/s), calculate the wavelength of the car.
A local radio station can be tuned in by dialing your radio to a frequency of 1175 kHz. Calculate the energy of the wave. (Hint: kHz means 1 x 10^3 Hz.)
An element has an electron configuration that ends in 5d^4. Which column is it in?
If an element has an electron configuration that ends in 5d^4, it is found in column 6 of the periodic table.
What is energy level?The energy level refers to the position where an electron is found in the atom. If the electron moves from a higher to a lower energy level, energy is evolved as light.
Now;
v = λf
f = v/λ
f = 3 * 10^8 m/s/6.34 x 10^–7m
f = 4.7 * 10^14 Hz
From E = hc/λ
E = 6.6 * 10^-34 * 3 * 10^8/4.65 x 10^–7m
E = 4.3 * 10^-19 J
From;
λ = h/mv
λ = 6.6 * 10^-34Js/905 kg * 26.8 m/s
λ = 2.27 * 10^-38 m
Given that;
E = hf
E = 6.6 * 10^-34Js * 1175 x 10^3 Hz
E = 7.8 * 10^-28 J
If an element has an electron configuration that ends in 5d^4, it is found in column 6 of the periodic table.
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A sample of gas occupies a volume of 72.0 mL . As it expands, it does 141.2 J of work on its surroundings at a constant pressure of 783 Torr . What is the final volume of the gas?
The final volume of the gas is 73.359 mL
Given :
A sample gas has an initial volume of 72.0 mL
The work done = 141.2 J
Pressure = 783 torr
The objective is to determine the final volume of the gas.
Since, the process does 141.2 J of work on its surroundings at a constant pressure of 783 Torr. Then, the pressure is external.
Converting the external pressure to atm; we have
External Pressure P[tex]ext[/tex]:
[tex]P ext[/tex] = 783 torr × [tex]\frac{1 atm}{760 torr}[/tex]
[tex]Pext[/tex] = 1.03 atm
The work done W = [tex]Pext V[/tex]
The change in volume ΔV= [tex]\frac{W}{Pext}[/tex]
ΔV = [tex]\frac{141.2 J \frac{1 L atm}{101.325 J} }{1.03 atm}[/tex]
ΔV = [tex]\frac{0.0014}{1.03}[/tex]
ΔV = 0.001359 L
ΔV = 1.359 mL
The initial volume = 72.0 mL
The change in volume V is ΔV = V₂ - V₁
- V₂ = - ΔV - V₁
multiply both sides by (-), we have:
V₂ = ΔV + V₁
= 1.359 mL + 72.0 mL
= 73.359 mL
Therefore, the final volume of the gas is 73.359 mL .
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How many grams of fluorine,
F2, are needed to generate 7.65
moles carbon tetrafluoride, CF4?
581.4g of F2 is needed to generate 7.65 mol of CF4.
The reaction of formation of CF4 is-
C(S) +2F2(g) -> CF4
So according to this equation 2 mol of F2 is needed to form 1 mol of CF4 thus to produce 7.65 mol of CF4 we need 15.3 mol of F2 .
And 1 mol F2= 38g of F2
so 15.3 mol F2 means 581.4 g of F2.
As no of mol = [tex]\frac{given mass}{molar mass}[/tex] . \
What is the formation reaction?
When 1 mol of any substance is produced from its elements in their standard state.
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If you started with 2.864 g of sodium bicarbonate and heated it to constant mass, what would the mass of the residue be after the reaction
If you started with 2.864 g of sodium bicarbonate and heated it to constant mass, 0.59 gram would be the mass that residue after the reaction.
What is Stoichiometry ?Stoichiometry helps us use the balanced chemical equation to measure quantitative relationships and it is to calculate the amounts of products and reactants that are given in a reaction.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
Now we have to write the balanced equation
2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O
According to Stoichiometry
= [tex]2.864\ g\ NaHCO_{3} \times \frac{1\ \text{mole}\ Na_2CO_3}{105.9\ g/mol} \times \frac{1\ \text{mole}\ CO_2}{2\ \text{mole}\ NaHCO_3} \times \frac{44\ g \ CO_2}{1\ \text{mole}\ CO_2}[/tex]
= 0.59 g
Thus from the above conclusion we can say that If you started with 2.864 g of sodium bicarbonate and heated it to constant mass, 0.59 gram would be the mass that residue after the reaction.
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Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Question: If you started with 2.486 g of sodium bicarbonate and heated it to constant mass, what would the mass of the residue be after the reaction? Show your work.
NaHCO₃ → Na₂CO₃ + CO₂ + H₂O
Cell Membranes
Write your procedure. List each step so that another student could follow the procedure and repeat your experiment.
The procedure to perform a cell membrane experiment is to:
Use beetroots cells to measure the permeability of the membraneThis is done to check the content of the pigment It is also meant to check the pigment leaks out of the cells.What is a Cell Membrane?This refers to the semi-permeable membrane that is around the cytoplasm of a cell.
Hence, we can see that the main purpose of the cell membrane practical experiment is to test the permeability of a membrane and to see the amount of liquid that a membrane can hold.
Please note that your question is incomplete so I gave you a general overview to get a better understanding of the concept.
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In the reaction of silver nitrate with copper metal, metallic silver comes out of solution, and the solution turns blue. This as a ________ reaction. Group of answer choices combustion
In the reaction of silver nitrate with copper metal, metallic silver comes out of solution, and the solution turns blue. This as a single replacement reaction.
What is single replacement reaction?A single replacement reaction, also known as a single displacement reaction, occurs when one element in a molecule is swapped out for another. The starting materials are always pure elements, such as a pure zinc metal or hydrogen gas, plus an aqueous compound.
A + BC → B + AC
When A is more reactive than B or when the product AC is more stable than BC, single replacement reactions happen. A and B could either be two halogens or two metals (with hydrogen included) (C is a cation). C functions as a spectator ion when BC and AC are in aqueous solutions.
For example, 2HCl(aq)+Zn(s)→ZnCl₂(aq)+H₂(g)
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The substance used for decolorization of undisireable color in a crystalline substance is
The substance used for decolorization of undesirable color in a crystalline substance is powdered animal charcoal
Decolorization is the process of eliminating organic contaminants with vivid colors from the sample mixture.
Unwanted colors are removed by boiling the item with a suitable amount of powdered animal charcoal in a hot solution that has been filtered so that the charcoal may absorb the colors. The charcoal is a finely divided carbon.
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4. Every morning we begin our day with a cup of tea which is made up of different components. Identify the process involved and mention its significance.
H2O is boiled with heat. Element which form a tea compound are pour in a cup and and the heated H2O is poured in the cup. Osmosis Occurs. Temperature and Stirring makes Osmosis Faster.
The warm water is poured into the cup together with the ingredients that make up the tea compound. Osmosis happens. Osmosis occurs more quickly with temperature and stirring.
Osmosis is the process by which water molecules pass across a cell's partly permeable membrane from a solution with a high concentration of water molecules to one with a lower concentration.
Through the process of osmosis, water is transferred from a location of high water concentration to a region of low water concentration. A semipermeable membrane is a surface that permits the passage of the chosen substances (in this case, water).
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what is the main ore o
f copper
Answer:
The principal copper ore mineral is chalcopyrite (CuFeS2), which is commonly smelted to yield a matte containing ~50% copper.
Answer:
chalcopyrite
Explanation:
The principal copper ore mineral is chalcopyrite (CuFeS2),
Why open flames near to ethanol can lead to serious fires?
[tex]\huge\bold\red{Aɴswᴇʀ}[/tex]
Ethanol is a polar solvent, a flammable liquid made of gasoline and alcohol that fully and immediately combines with water instead of separating, which is the opposite of what a firefighter attempting to knock down a car fire might expect.
Answer:
Ethanol has a high vapor pressure. Therefore, even though you may not be able to see the particles of ethanol in the air, they are there and will readily fuel a combustion reaction if an open flame is nearby
60.0 mL of 0.0100 M H3PO4 are required to neutralize 30.0 mL of a solution of KOH. What is the molarity of the potassium hydroxide?
The molarity of the potassium hydroxide required to neutralize 60.0 mL of 0.0100 M H3PO4 is 0.02M.
How to calculate molarity?The molarity of a solution can be calculated using the following formula:
CaVa = CbVb
Where;
Ca = concentration of acidCb = concentration of baseVa = volume of acidVb = volume of base60 × 0.0100 = 30 × Cb
0.6 = 30Cb
Cb = 0.6/30
Cb = 0.02M
Therefore, molarity of the potassium hydroxide required to neutralize 60.0 mL of 0.0100 M H3PO4 is 0.02M.
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