Answer: La+3 binds to PO4-3 in the urine sample which prevents the formation of Ca3(PO4)2 and frees the Ca+2 in the sample to be atomized.
Explanation:
In the presence of phosphates, the calcium ions form a refractory compound (calcium phosphate) which is not atomized in the plasma/flame in atomic absorption spectroscopy.
The addition of a releasing agent like lanthanum to the sample minimizes the formation of refractory compounds as the lanthanum binds with the phosphate ions to form more volatile compounds.
Alka seltzer and water from
Answer:
ph2h2o
Explanation:
not quite sure explain
What is the Molarity of NaOH if it takes 2L of NaOH to reach the equivalence point in a titration with 5L of 0.4 M HCl? Assume a 1:1 mole ratio.
Answer:
2.4 H[tex]x^{2}[/tex]
Explanation:
Which statements are true about balancing chemical equations?
Check all that apply.
A. Atoms that are in only one of the reactants and only one of the
products should be done last.
B. Single atoms should be done last.
C. Balancing chemical equations involves trial and error.
D. Balancing chemical equations does not involve trial and error.
SIIRRAT
A. Atoms that are in only one of the reactants and only one of the
products should be done last.
C. Balancing chemical equations involves trial and error.
What is balancing chemical equations?A balanced chemical equation is an equation for a chemical reaction in which the number of atoms for each element in the chemical reaction is the same for both the reactants and the products. In other words, the mass and the charge are balanced on both sides i.e. reactants and products of the chemical reaction. If two atoms are present on the side of reactant then the two number of atoms are present on the side of product, then this equation is called balanced chemical equation.
So we can conclude that option A and C are the statements that are true about balancing chemical equations.
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Answer:
b and c
Explanation:
Water is your body's principal chemical component and makes up about 60 percent of your body weight. Your body depends on water to survive. About 20 percent of daily fluid intake usually comes from food and the rest from drinks.The formula to water intake calculator is:c=[w∗ f∗ g+12∗ m30]/8 where:c = fluid amount in cupsw = weight in poundsf = age factor (0.642 for age < 30; 0.56 for 30 < age < 55; 0.481 for age > 55)g = gender factor (1 for male; 0.73 for female)m = exercise time in minutesExample 1: Find the water intake amount for a male of 20 years old, weight 158 pounds, exercise 50 minutes dailySolution: w = 158, f = 0.642 (age < 30), g = 1 (male), m = 50 cups
Answer:
Explanation:
According to the formula provided in the question, the formula for water intake amount is C = [w × f × (g+12) × m × 30]/8
where c is the fluid amount in cups
w is the weight in pounds (158 pounds)
f is the age factor (0.642 because the age is below 30)
g is the gender actor (1 because the individual is a male)
m is the exercise time in minutes (50 minutes)
c = 158 × 0.642 × (1 + 12) × 50 × 30/8
c = 1978001.99/8
c = 247250.25 cups
NOTE: Kindly verify the formula in this question before proceeding to practicing the steps in this answer
what is two or more atoms chemically bonded together?
Answer:
i belive its molecule
Explanation:
Explanation:
when they bond with each other the resultant chemical structure is molecule. the familiar water molecule is h2o
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What method of separation is used to separate liquids from insoluble solids?
Answer:
Filtration
Explanation:
Filtration This technique is used to separate an insoluble solid from a liquid. It can be used to obtain a product that is free from unreacted chemicals, by-products or solvent.
Answer:
filtration
Explanation:
If a substance does not dissolve in a solvent, we say that it is insoluble . For example, sand does not dissolve in water – it is insoluble. Filtration is a method for separating an insoluble solid from a liquid.
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The units used on the U.S. freshwater withdrawals, 1950-2015 map are listed as Mgal/d. One million gallons of water per day (Mgal/d), covers a football field with about ___ feet of water.
Question 8 options:
0.5
1.2
2.8
5.8
Based on the conversion factor from gallons to cubic foot, one million gallons of water per day will cover a football by 2.3 feet.
What is the conversion from gallons to cubic foot?To convert from gallons to cubic foot the following conversion factors are used:
I gallon = 0.134 cubic foot1 million gallon = 134000 cubic footThe standard area for an American football field = 57,600 square feet
The height which one million gallons of water per day 15(Mgal/d), covers a football will then be:
Height = 134000 cubic foot / 57,600 square feet
Height = 2.3 feet.
Therefore, one million gallons of water per day will cover a football by 2.3 feet.
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Answer:
2.8 I took the test
Explanation:
Mandy made the following table describing the conditions required to form sleet and snow, but left something out. Which word should replace the X in the left column?
Temperature in the cloud Below freezing Below freezing
Temperature X Above freezing Below freezing
State of water Mix of solid and liquid Solid
above cloud
below cloud
on the ground
in the soil
I am not the best at this, but im pretty sure its below cloud
Answer:
it is not cloud it is soil
Explanation:
Describe how a Chemical property is different between NaCl and its elements.
Describe how a Physical property is different between NO2 and its elements
Answer:
See detailed explanation.
Explanation:
Hello.
a. In this case, considering sodium chloride, sodium a chlorine a typical chemical reaction could be used in order to stand out their differences. For instance, when mixed with water sodium chloride just dissolves in it, sodium readily reacts yielding sodium hydroxide via a very exothermic chemical reaction which also fires on sodium and hydrogen gas s given off:
[tex]H_2O+Na\rightarrow NaOH+H_2[/tex]
Moreover, chlorine reacts with water to yield hypochlorous acid and hydrochloric acid in a very slow equilibrium reaction:
[tex]H_2O+Cl_2\rightleftharpoons HClO+HCl[/tex]
b. In this case, regarding nitrogen dioxide, nitrogen and oxygen, it is widely known that nitrogen dioxide is a red-brown gas which is also toxic whereas both nitrogen and oxygen are colorless.
Best regards.
0.00401g is dissolved in 675 000ml what is the concentration of this solution in ppm
Answer:
grams of solute in 1,000,000 mL of solution ... A mass of 0.00401 g of salt is dissolved in 675,000 mL of water.
Explanation:
What is the formula for finding the molar mass of water?
A.mass of H + 2 + mass of O
B.mass of H x 2 + mass of O
C.mass of H + mass of O x 2
D.(mass of H + mass of O) x 2
Answer:
B is the answer to the questionHow do I do this program? ASAP
Answer:
Nitrogen is the limiting reactant, and 3.74
grams of ammonia is formed.
Hope this helps
what is the experimental group? on edpuzzle
Answer: An experimental group is a test sample or the group that receives an experimental procedure.
Explanation: This group is exposed to changes in the independent variable being tested. The values of the independent variable and the impact on the dependent variable are recorded. An experiment may include multiple experimental groups at one time.
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Create a path in which the carbon atom goes from atmosphere to the hydrosphere, biosphere, geosphere
Answer:
............
Explanation:
Explanation:
God loves you you are a good person
which states of matter only appear in the hydrosphere
How many total atoms are in 0.930 g of P2O5?
Molar mass P2O5 = 31 x 2 + 16 x 5 => 142 g/mol
142 g ---------------- 6.02 x 10²³ molecules
0.930g g ------------ ( molecules )
molecules = 0.920 x ( 6.02 x 10²³ ) / 142
molecules = 5.53 x 10²³ / 142
= 3.89 x 10²¹ molecules
1 molecule P2O5 -------------------------- 7 atoms
3.89 x 10²¹ molecules -------------------- ( atoms )
atoms = ( 3.89 x 10²¹) x 7 / 1
atoms = 2.72 x 10²² atoms of P2O5
2.72 x 10²² atoms of P₂O₅ are there in 0.930 g of P₂O₅.
Molar mass P₂O₅ = 31 x 2 + 16 x 5 => 142 g/mol
142 g atoms are present in 6.02 x 10²³ molecules
Therefore, total number of molecules in 0.930g of atoms is calculated as-
molecules = 0.930 x ( 6.02 x 10²³ ) / 142
molecules = 5.53 x 10²³ / 142
= 3.89 x 10²¹ molecules
1 molecule of P₂O₅ contains 7 atoms
Therefore, the number of atoms in 3.89 x 10²¹ molecules is calculated as
atoms = ( 3.89 x 10²¹) x 7 / 1
atoms = 2.72 x 10²² atoms of P₂O₅
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Is average atomic mass and atomic mass the same
Answer:
The key difference between atomic mass and average atomic mass is that the atomic mass is the mass of an atom, whereas the average atomic mass is the mass of an atom of a particular chemical element calculated by considering isotopes of that element.
Explanation:
Find the density of an object with a mass of 8.7g that has a volume of 25.4ml
Answer:
Density is 0.34
Explanation:
D=m/V
Density is equal to mass divided by volume.
so 8.7 divided by 25.4 is equal to 0.34. The density of that object is 0.34
A sample originally contained 1.28 g of a radioisotope. It now contains 1.12 g of its daughter isotope.
How many half-lives have passed since the sample originally formed?
Answer:
3
Explanation:
A glass cylinder contains four liquids in four separate layers. One liquid is water. The purple liquid has a density 1.62 g/cm3. The yellow liquid has a density of 0.46 g/cm3. The red has a density of 0.91 g/cm3. What is the order of the liquids in the cylinder? Explain your answer. What will happen if you slip a small, flat, chip of wood (density 0.85 g/cm3) into the cylinder?
Answer:
The order of the liquids in the cylinder will be yellow liquid, followed by red liquid, water & lastly purple liquid.The wood is likely to sink in the 1st liquid(yellow) but float on the 2nd liquid(red).Explanation:
The arrangement of the liquids in the cylinder is determined by their densities. Water has a density of 1g/cm3 & that of the others are stated in the question already. Comparing the liquids densities now, we can easily identify the liquid with the lowest density to that of the highest. The liquids with greater densities will sink while those with lower ones wsill float. In this case, the yellow one has the least density of 0.46g/cm3,followed by the red one(0.91g/cm3),water of density 1.0g/cm3 & coming last, the purple liquid(1.62g/cm3)The wood has a density of 0.85g/cm3. This will make it denser than the 1st liquid(yellow) so will sink in it but is lower in density than the next liquid so will float on it.Hope you understand now. I'll appreciate getting brainliest from you if you liked the explanation.
The order of the liquids in the cylinder will be yellow liquid, followed by red liquid, water, and lastly purple liquid. The wood is likely to sink in the 1st liquid(yellow) but float in the 2nd liquid (red).
The densities of the liquids in the cylinder dictate how they are arranged. Water's density is 1g/cm³, and the other densities are previously mentioned in the question. Now that we can compare the liquid densities, we can quickly distinguish between the liquids based on density.
Higher-density liquids will sink, whilst lower-density liquids will float. The yellow liquid in this instance has the lowest density, 0.46 g/cm³, followed by the red liquid (0.9 g/cm³), water (1.0 g/cm³), and the purple liquid (1.6 g/cm³).
The density of the wood is 0.85g/cm³. Because of this, it will become denser than the first liquid (yellow), sink in it, but less dense than the second liquid, float on it.
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Assuming all solvents are suitable to recrystallize the desired product, which solvent is best for removing the impurity through a hot filtration
The solvent that is best for removing the impurity through hot filtration is petroleum ether. It is an organic solvent.
What is Petroleum ether?Petroleum ether is an organic solvent derived from petroleum, i.e., it is a well-known aliphatic hydrocarbon.
Petroleum ether is not a true ether because the word 'ether' makes reference to its extremely high level of volatility.
Moreover, hot filtration is a chemical methodology used for filtering solutions that are able to crystallize when they cool.
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The aftermath of a hurricane demonstrated here is called a
watershed
storm surge
runoff
white cap
Calculate the pH of a solution in which one normal adult dose of aspirin (640 mg ) is dissolved in 10 ounces of water. Express your answer to one decimal place.
The pH of the solution in which one normal adult dose aspirin is dissolved is : 2.7
Given data :
mass of aspirin = 640 mg = 0.640 g
volume of water = 10 ounces = 0.295735 L
molar mass of aspirin = 180.16 g/mol
moles of aspirin = mass / molar mass = 0.00355 mol
Determine the pH of the solutionFirst step : calculate the concentration of aspirin
= moles of Aspirin / volume of water
= 0.00355 / 0.295735
= 0.012 M
Given that pKa of Aspirin = 3.5
pKa = -logKa
therefore ; Ka = [tex]10^{-3.5}[/tex] = [tex]3.162 * 10^{-4}[/tex]
From the Ice table
[tex]3.162 * 10^{-4}[/tex] = [tex]\frac{x + H^+}{[aspirin]}[/tex] = [tex]\frac{x^{2} }{0.012-x}[/tex]
given that the value of Ka is small we will ignore -x
x² = [tex]3.162 * 10^{-4} * 0.012[/tex]
x = [tex]1.948 * 10^{-3}[/tex]
Therefore
[ H⁺ ] = [tex]1.948 * 10^{-3}[/tex]
given that
pH = - Log [ H⁺ ]
= - ( -3 + log 1.948 )
= 2.71 ≈ 2.7
Hence we can conclude that The pH of the solution in which one normal adult dose aspirin is dissolved is : 2.7
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What is a chemical reaction that occurs when two or more reactants combine into one product?
A: single-displacement reaction
B: decomposition reaction
C: synthesis reaction
D: combustion reaction
Answer:
The answer should be C. synthesis reaction
3.Convert 50 degree Celsius to Fahrenheit
Answer:
122 forenhieght
Explanation:
(50°C × 9/5) + 32 = 122°F
State components of reliability’s
Answer:
I need help on this Laugh out loud
Explanation:
How many moles of nitrogen, N, are in 62.0 g of nitrous oxide, N2O?
What element is represented by the following electron configuration?
Answer:
Cobalt
Explanation:
From the question given above, the following data were obtained:
Electronic configuration of element => 1s² 2s²2p⁶ 3s²3p⁶ 4s²3d⁷
Name of the Element =?
Next, we shall determine the number of electrons in the atom of the element. This can be obtained as follow:
Number of electron = 2 + 2 + 6 + 2 + 6 + 2 + 7
Number of electron = 27
Next, we shall determine the number protons in the atom of the element. This can be obtained as follow:
For a ground state element,
Number of Proton = number of Electron
Number of electrons = 27
Number of proton = Number of electron = 27
Number of protons = 27
Therefore, the number of protons in the atom of the element is 27
Next, we shall determine the atomic number of the element. This can be obtained as follow:
The atomic number of an element is simply the number of protons in the atom of the element. Mathematically,
Atomic number = proton number
Number of proton = 27
Finally, we shall determine the name of the element as follow:
Comparing the atomic number of the element (i.e 27) with those in the periodic table, the element is Cobalt since no two elements have the same atomic number.
How many moles are in 15 grams of Li?
26.8 g of ammonium chloride is dissolved in water to make a 0.25 L solution. what is the molarity of the solution
Taking into account the definition of molarity, the molarity of the solution is 2 [tex]\frac{moles}{liter}[/tex].
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Molarity of the solution in this caseIn this case, 26.8 g of ammonium chloride is dissolved in water to make a 0.25 L solution. So you know:
number of moles= [tex]26.8 gramsx\frac{1 mole}{53.45 grams} =[/tex] 0.50 moles (being 53.45 [tex]\frac{grams}{mole}[/tex] the molar mass of ammonium chloride)volume= 0.25 LReplacing in the definition of molarity:
[tex]Molarity=\frac{0.50 moles}{0.25 L}[/tex]
Solving:
Molarity= 2 [tex]\frac{moles}{liter}[/tex]
Finally, the molarity of the solution is 2 [tex]\frac{moles}{liter}[/tex].
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