The amounts of isopropyl 99% alcohol and sterile water you need to use to make the 70% isopropyl solution using the alligation method are 707.1 mL of isopropyl 99% and 292.9 mL of water. The correct answer is option C.
Alligation method is a type of mathematical process used to calculate the quantities of two or more components of a mixture to obtain a mixture with a specific concentration or quality. This method uses the concept of averaging and the weighted average to get the desired results.
The allegation formula for isopropyl alcohol solution: Required % strength —— Higher % strength | DifferenceLower % strength | Difference70% ——- 99% | 29%70-29=41% | 29%
So, the required ratio of the alcohol to be mixed with water should be 41:29. Thus, the volumes of the 99% alcohol and water needed are (41/70) L and (29/70) L, respectively. Let's substitute the values and calculate:
41/70 × 1L = 0.586 L of 99% isopropyl alcohol
29/70 × 1L = 0.414 L of sterile water
Now we have the volumes of the 99% isopropyl alcohol and sterile water required. By adding these, the total volume of the solution is 1L, as given in the question. Therefore, the answer is 707.1 mL of 99% isopropyl alcohol and 292.9 mL of sterile water (707.1 mL + 292.9 mL = 1000 mL = 1 L).
Hence, option C) 707.1 mL of isopropyl 99% and 292.9 mL of water is the correct answer.
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what is the difference between an enzyme and an inhibitor?
When the water inside a living cell freezes, the ice crystals damage the cell. The wood frog is a unique creature that can survive being frozen. In extremely cold
conditions, the frogs liver produces large amounts of glucose (C6H12O6), which becomes concentrated in the frog's cells. How does the glucose help prevent ice
from forming in the frogs cells?
A)The added glucose dissociates and creates faster moving molecules.
B) The added glucose lowers the vapor pressure relative to the pure solvent.
C) The added glucose requires more energy which warms the frog
D)The added glucose lowers the freezing point of the solution within the frog's cells.
Conversions to Grams Beryllium is a light metal used to fabricate transparent X-ray windows for medical imaging instruments. How many moles of Be are in a thin-foil window weighing 3.24 g? Select the correct answer below: O 0.360 mol O 2.78mol O 19.50 mol O 29.20 mol
To determine the number of moles of beryllium (Be) in a thin-foil window weighing 3.24 g, we can use the molar mass of beryllium to convert grams to moles. The correct answer is option O) 0.360 mol.
The molar mass of beryllium (Be) is approximately 9.01 g/mol. To calculate the number of moles, we divide the given mass (3.24 g) by the molar mass of beryllium:
Number of moles = Mass of substance / Molar mass
Number of moles = 3.24 g / 9.01 g/mol ≈ 0.3596 mol
Rounding to the appropriate number of significant figures, the number of moles of beryllium in the thin-foil window is approximately 0.360 mol, which corresponds to option O) 0.360 mol.
Note: It's important to pay attention to the significant figures in the given mass (3.24 g) and round the answer accordingly. In this case, the answer is rounded to three significant figures since the given mass has three significant figures.
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how many grams of salt are in 5 l of a solution with a concentration of 3 g/L
Answer: 15 grams of salt are there in 5 L of solution.
Explanation:
Concentration of a solution is defined as the number of grams of solute dissolved per liter of the solution.
Given : Concentration of solution : 3 g/L
1 Liter of solution contains = 3 gram of salt
Thus 5 L of solution contains = [tex]\frac{3g}{1L}\times 5L=15g[/tex]
Thus 15 grams of salt are there in 5 L of solution.
A train travels 854 meters in 75 seconds. What is the speed of the train?
Answer:
11.3m/s
Explanation:
evaluate the double integral 3x-y da where r is the region in the first quadrant enclosed by the circle x^2 y^2=9 and the lines x=0 and y=x by changing to polar coordinates
The value of the double integral ∬(3x - y) dA, where the region R is in the first quadrant enclosed by the circle x² + y² = 9, the line x = 0, and the line y = x, using the transformation to polar coordinates, is 27/4√2.
To evaluate the double integral, we can switch to polar coordinates. In polar coordinates, the variables x and y are expressed in terms of r (radius) and θ (angle).
The region R, which is enclosed by the circle x² + y² = 9, can be expressed in polar coordinates as 0 ≤ r ≤ 3 and 0 ≤ θ ≤ π/4. This represents the first quadrant portion of the circle.
The Jacobian of the transformation from Cartesian to polar coordinates is r (the absolute value of the determinant of the Jacobian matrix). So, dA in polar coordinates is equal to r dr dθ.
Now, we can express the integral in terms of polar coordinates:
∬(3x - y) dA = ∫∫(3r cos θ - r sin θ) r dr dθ
Next, we need to set up the limits of integration. Since the region R is bounded by x = 0, y = x, and the circle x² + y² = 9, we can set up the limits as follows:
0 ≤ θ ≤ π/4 (corresponding to the angle that spans the first quadrant)
0 ≤ r ≤ 3 (corresponding to the radius of the circle)
Now, we can evaluate the integral:
∫[0,π/4] ∫[0,3] (3r cos θ - r sin θ) r dr dθ
By integrating with respect to r first, we get:
∫[0,π/4] [(3/4) r³ cos θ - (1/2) r³ sin θ] |[0,3] dθ
Simplifying further, we obtain:
∫[0,π/4] [(27/4) cos θ - (27/2) sin θ] dθ
Finally, we integrate with respect to θ:
[27/4 sin θ + (27/2) cos θ] |[0,π/4]
Plugging in the limits of integration, we have:
(27/4 sin(π/4) + (27/2) cos(π/4)) - (27/4 sin(0) + (27/2) cos(0))
Evaluating the trigonometric functions at the respective angles, we find:
(27/4 (1/√2) + (27/2) (1/√2)) - (27/4 (0) + (27/2) (1))
Simplifying further, we get the final result:
(27/4√2 + 27/2√2) - (0 + 27/2) = (27/4√2 + 27/2√2) - 27/2 = 27/4√2
Therefore, the value of the double integral ∬(3x - y) dA over the region R, using the transformation to polar coordinates, is 27/4√2.
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What volume of 2.0 M hydrochloric acid solution will be consumed when it reacts with 5 grams of magnesium to form magnesium chloride and hydrogen gas?
2HCl + Mg -> MgCl2 + H2
Answer:
Explanation:
Remember, matter can neither be created nor destroyed, so every atom of reactant the leftt side of the equation must be accounted for in the products on the right side of the equation. With magnesium and hydrochloric acid we have: Mg + 2HCl → MgCl2 + H2(g). Magnesium is divalent, and so requires two chloride ions to form magnesium chloride. Hydrogen gas is a diatomic molecule, so the reaction requires the product to be H2. Going across the equation from left to right we have 1 atom of magnesium (accounted for on the right side of the equation), and on the left, 2 moles of hydrochloric acid; the two hydrogens represented on the left of the equation are accounted for on the right of the equation. Likewise, the two chloride anions on the left of the equation are accounted for in the formation of MgCl2 on the right. When all the atoms are accounted for on both sides of the equation, we say the equation is "balanced".
If the oxidation of glucose 6-phosphate via the pentose phosphate pathway were being used primarily to generate NADPH for biosynthesis, the other product, ribose 5-phosphate, would accumulate. What problem might this cause? Ribose 5-phosphate would oxidize NADPH. It would quickly deplete NADPH in the cell. NADP+ would react with ribose 5-phosphate. It would force the reaction in the reverse direction
If the oxidation of glucose 6-phosphate via the pentose phosphate pathway were being used primarily to generate NADPH for biosynthesis, the other product, ribose 5-phosphate would accumulate. The accumulation of ribose 5-phosphate would lead to a problem, i.e. it would quickly deplete NADPH in the cell.
This is because ribose 5-phosphate is produced in the first step of the pentose phosphate pathway, and if it is not utilized in the next step, it will accumulate. This accumulation of ribose 5-phosphate will have a detrimental effect on the cell's metabolic pathways. In this case, the ribose 5-phosphate will compete with NADP+ as an electron acceptor. Since NADPH is required for the synthesis of fatty acids, nucleotides, and other essential biomolecules, its depletion will lead to an insufficient supply of these biomolecules. Therefore, the accumulation of ribose 5-phosphate will impair the biosynthetic processes that require NADPH.
Thus, it is essential to balance the pentose phosphate pathway to maintain the cellular redox balance, which is necessary for the normal functioning of the cell.
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which of the following samples contains the greatest number of atoms?
The sample that has the largest number of atoms is 1g of Chlorine(Cl). That is option C.
How to determine the sample with the largest number of atoms?To calculate the sample with the largest number of atoms, the various number of atoms of each sample should be determined.
That is;
For sample A;
Na = 23 g
But 1g of Na= 6.022×10²³
23g of Na= 6.022×23 = 1.39×10²¹
For sample B;
Li = 7g
But 1 g of Na = 6.022×10²³
7 g of Na = 7× 6.022×10²³
= 4.22×10²⁴
For sample C;
Cl2= 71
But 1 g of Cl = 6.022×10²³
71g of Cl = 71×6.022×10²³
= 4.28 × 10²⁵
For sample D;
Au = 197
But 1g of Au = 6.022×10²³
197g = 197×6.022 × 10²³
= 1.186 × 10²⁶
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Complete question:
Which one of the following will have greatest number of atoms?
A.) 1g Na
B.) 1g Li
C.) 1g Cl2
D.) 1g Au
Which of the following is a decomposition reaction? Group of answer choices
some of these answers
SO2 + O2 → 2SO3
2H2O2 → 2H2O + O2
2C2H2 + 5O2 → 4CO2 + 2H2O
The decomposition reaction is 2[tex]H_{2}O_{2}[/tex] → 2[tex]H_{2}[/tex]O + [tex]O_{2}[/tex]
Hence, the correct option is B.
In this reaction, hydrogen peroxide ([tex]H_{2}O_{2}[/tex] ) decomposes into water ([tex]H_{2}[/tex]O
) and oxygen gas ( [tex]O_{2}[/tex]). Hydrogen peroxide is a compound composed of hydrogen and oxygen. Through a decomposition reaction, the hydrogen peroxide molecules split apart, resulting in the formation of water and oxygen.
The balanced equation indicates that for every two molecules of hydrogen peroxide, two molecules of water and one molecule of oxygen gas are produced. This reaction is an example of a decomposition reaction because a single compound (hydrogen peroxide) breaks down into multiple simpler substances (water and oxygen gas).
The decomposition reaction is 2[tex]H_{2}O_{2}[/tex] → 2[tex]H_{2}[/tex]O + [tex]O_{2}[/tex]
Hence, the correct option is B.
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Theories must be supported by many lines of evidence.
True
or
False
There is a balloon filled with 1 liter of methane, CH4 gas at STP and a balloon filled with one liter of hydrogen gas, H2 at STP, which balloon contains more grams of hydrogen gas?
H2
They are equal
CH4
Not enough information
Answer:
H2
Explanation:
I would say H2 cause CH4 have less hydrogen gas .
At standard temperature and pressure conditions, both the balloons have equal grams of gas.
What is standard temperature and pressure?Standard temperature and pressure are defined as a standard set of conditions required for experimental measurements which are established to allow comparison between different sets of data.
Standards which are commonly used are those International Union of pure and applied chemistry and national institute of standards and technology.These are not universally accepted standards but are the ones which are commonly used.
Standard conditions of pressure and temperature are necessary to define standard reference conditions used to express volumes of liquids and gases.
These values are important to physicists, chemists ,engineers ,pilots and navigators.
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Mendeleev arranged the
elements by increasing
atomic ?
Mendeleev arranged the elements in the periodic table on the basis of atomic masses and stated the behavior of the elements in a periodic law. The periodic law is when elements arranged by the atomic masses they exhibit the presence of similar properties. Mendeleev focused on the chemical properties of the elements and Meyer focused on the physical properties of the elements. The change in the periodic table is that the elements are now arranged in the order of their atomic numbers instead of their atomic masses.
How is thermal energy transferred between two objects that are at different temperatures?
Group of answer choices
Heat flows from the object that has more thermal energy to the object with less thermal energy.
The object at a lower temperature pulls heat from the warmer object.
Heat flows from the warmer object to the cooler object until they reach the same temperature.
Heat flows back and forth between the two objects untl they reach the same temperature.
Answer:
heat flows from the object that has more thermal more energy to the object with less thermal energy
Which ion dissociates in Acids?
A- ООН-
B- ОН+
C- ОН+
D- COOH
What element is being oxidized in the following redox reaction? Pb 2+(aq) + NH4 +(aq) - Pb(s) + NO3 (aq)
A. H
B. Pb
C. N
D. O
PLEASEEEEEEEEEEEEE HELP You get 28 points
1. _____are muscles that you control, for example, your bicep.
2. ________muscles are muscles that you DO NOT consciously control, for example, your heart.
3. Tendons are _______ that connect muscles to joints.
A solution at 25 ∘C has pOH = 10.53. Which of the following statements is or are true?
The solution is acidic.
The pH of the solution is 14.00 - 10.53.
For this solution, [OH−] = 10−10.53 M.
Only one of the statements is true.
Statements I and II are true.
Statements I and III are true.
Statements II and III are true.
All three statements are true.
After considering the given data and statements we conclude that the correct option is A , Only one of the statements is true.
The statement that is true for a solution at 25 °C with pOH = 10.53 is:
iii) For this solution, [tex][OH^-] = 10^{(-10.53)} M.[/tex]
Statement i) is false due to the fact that a solution with a pOH greater than 7 is basic, not acidic.
Statement ii) is false due to the pH of the solution can be evaluated from pOH using the equation [tex]pH + pOH = 14[/tex], not by subtracting pOH from 14. Therefore, the pH of the solution is 14 - 10.53 = 3.47, which is acidic.
Statement iii) is true due to the concentration of hydroxide ions [tex]([OH^-])[/tex] can be calculated from pOH using the equation[tex][OH^-] = 10^{(-pOH)}[/tex]. Therefore, [tex][OH^-] = 10^{(-10.53)} M.[/tex]
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he nucleus of an atom is small compared to the size of the atom. why is this consistent with rutherford's nuclear theory? the nucleus of an atom is small compared to the size of the atom. why is this consistent with rutherford's nuclear theory? rutherford's nuclear theory states that most of the mass of an atom and all of its electrons are contained in a small core called the nucleus. rutherford's nuclear theory states that the nucleus of an atom is small compared to the size of the atom, and, therefore, the nucleus has a relatively low mass compared to the mass of an atom. rutherford's nuclear theory states that the nucleus is small but contains about half of the mass of an atom. rutherford's nuclear theory states that most of the mass of an atom and all of its positive charge are contained in a small core called the nucleus. request answer
The nucleus of an atom is small compared to the size of the atom because of Rutherford's nuclear theory. Rutherford's nuclear theory states that most of the mass of an atom and all of its positive charge are contained in a small core called the nucleus.
This statement is consistent with the fact that the nucleus of an atom is small compared to the size of the atom. Rutherford's nuclear theory states that the nucleus of an atom is small compared to the size of the atom, and, therefore, the nucleus has a relatively low mass compared to the mass of an atom.
Rutherford's nuclear theory states that the nucleus is small but contains about half of the mass of an atom. The nuclear theory was discovered by Ernest Rutherford in 1911.
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how many more grams should be added
Answer:
50?
I think but not 100% sure if not lmk
A weak base. B. has a K. of 4.46 x 10-10 A solution with an unknown initial concentration is tested, and found to have a pH of 8.39. Determine the initial concentration of B.
Answer:
0.013MB
Explanation:
1,670,000,000 in
scientific notation pleaseeee
Answer:
1.67 × 10^9
Explanation:
The density of ethanol is 0.789 g/mL. What is the mass of 150 ml. of this alcohol?
Answer: 120 g
Explanation:
2. Which of these helps to avoid muscle injuries while exercising?
A:exercising vigorously when muscles are stiff to warm them up
B:slowly and gently stretching muscles before hard exercise
C.pushing through exercise with hurt muscles
D;bursting into hard activity after being still for a while
Answer:
B
Explanation:
It is important to stretch your muslces as a warm up prior to any exercise.
Answer:
B
Explanation:
Tonsils are lymphatic organs located in the...
A. armpits.
B. bones.
C. throat.
D. ribs.
Answer:
C. throat
Explanation:
Water (density=1.0gcm3) rises in a glass capillary tube to a height of 8.4 cm at 25∘C. What is the diameter of the capillary tube? The surface tension of water is 0.07199 kgs2.
The diameter of the capillary tube is approximately 8.12 micrometers.
To find the diameter of the capillary tube, we can use the relationship between the height of the liquid column in a capillary tube and the surface tension.
The formula for the height of the liquid column in a capillary tube is given by:
h = (2 × T) / (ρ × g × r)
where:
h is the height of the liquid column,
T is the surface tension of the liquid,
ρ is the density of the liquid,
g is the acceleration due to gravity, and
r is the radius of the capillary tube.
In this case, we are given:
h = 8.4 cm = 0.084 m (converted to meters),
T = 0.07199 kg/s²,
ρ = 1.0 g/cm³ = 1000 kg/m³ (converted to kg/m³), and
g = 9.8 m/s².
We can rearrange the formula to solve for the radius of the capillary tube:
r = (2 × T) / (ρ × g × h)
Substituting the given values:
r = (2 × 0.07199 kg/s²) / (1000 kg/m³ × 9.8 m/s² × 0.084 m)
Calculating this expression gives us:
r ≈ 4.06 x 10⁻⁶ m
Finally, we can find the diameter of the capillary tube by doubling the radius:
diameter = 2 × r = 2 × 4.06 x 10⁻⁶ m = 8.12 x 10⁻⁶ m
Therefore, the diameter of the capillary tube is approximately 8.12 micrometers.
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When you add an inert gas, the reaction
Answer: When an inert gas is added to the system in equilibrium at constant pressure, then the total volume will increase.
Explanation:
What is one end of a magnetized compass's needle attracted to?
Answer: The red on is attracted to The north pole
Explanation:
according to the balanced reaction below, calculate the quantity of moles of no₂ gas that forms when 5.20 × 10⁻³ mol of n₂o₅ gas completely reacts: 2 n₂o₅(g) → 4 no₂(g) o₂(g
when 5.20 × 10⁻³ moles of N₂O₅ gas completely reacts, 2.60 × 10⁻³ mol of NO₂ gas is formed.
What is Moles?
A mole is a unit of measurement of the quantity of a substance in the International System of Units. It is defined as exactly 6.02214076×10²³ particles, which can be atoms, molecules, ions or electrons.
To calculate the quantity of moles of NO₂ gas formed, we need to use the stoichiometric coefficients from the balanced reaction.
The balanced equation is:
2 N₂O₅(g) → 4 NO₂(g) + O₂(g)
According to the balanced equation, for every 2 moles of N₂O₅ that react, 4 moles of NO₂ are produced.
So, we can set up a ratio:
2 moles of N₂O₅ : 4 moles of NO₂
Now, we can use this ratio to calculate the moles of NO₂ gas formed when 5.20 × 10⁻³ mol of N₂O₅ gas reacts.
Given: Moles of N₂O₅ = 5.20 × 10⁻³ mol
Using the ratio:
4 moles of NO₂
------------------- = x moles of NO₂
2 moles of N₂O₅
x = (4/2) × (5.20 × 10⁻³) = 2.60 × 10⁻³ mol
Therefore, when 5.20 × 10⁻³ mol of N₂O₅ gas completely reacts, 2.60 × 10⁻³ mol of NO₂ gas is formed.
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Which best represents the number of moles in exactly 108 grams of gold?
Answer: 0.548 mol
Explanation: