Answer:
Usually the use of two calibrant ions to bracket the analyte ion will achieve better accuracy. To achieve optimum mass accuracy the m/z of a single point calibrant ion should be as close as possible to that of the analyte ion; this is particularly important for magnetic sector mass spectrometers.
Which of the following methods would you use to prepare 1.00 L of 0.125 M sulfuric
acid?
100.mL
(a) Add 50.0 mL of 3.00 M sulfuric acid to 950. mL of water
(b) Add 20.8 mL of 6.00 M sulfuric acid to 979.2 mL of water
(c) Add 90.2 mL of 1.50 M sulfuric acid to 909.8 mL of water
There are two ways to make 1 liter of 0.125 molars of sulfuric acid. We will perform both calculations to show that only one of the two methods is correct.
Method A and Method B. Dilute the 20.8 mil guide in a 6.00 bowler and add H two s. 4:4 to 1.00 L. Let's see if that's correct. Use milliliters. Sometimes the similarity equals the middle leader sometimes the similarity equals her 20.8 million leaders multiplied by 6.00 Mueller equals 1000 ml times X, the resolution of X.
Get a calculator. 20.8 times 6 divided by 1, 1000 is 1.2 0.124 8 pitchers equals 0.125 moles. It looks pretty good. It seems like that's what we wanted to do. Method B assumes there are 9,500 hoops. 9.50 times 10 2 ml H2O 2 50 ml 3.00 molar sulfuric acid.0.0500 guide x 3.00 wolves per liter equals 0.1 50 moles. Then take 0.150 moles. Divide this by the total volume of 0.950L plus 0.050L. This was the leader .150 bowler which was undesirable. So this is a way to show that only one is correct.
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Granite has a Specific heat of 800 J/g C. What mass of granite is needed to store 150,200 Joules from 30 C to 75 C?
Granite has a specific heat of 800 J/g °C. the mass of granite is needed to store 150200 J from 30 °C to 75 °C is 4.17 g.
Given that :
specific heat of granite ( c ) = 800 J/g °C.
Q store = 150,200 J
temperature T1 = 30 °C.
temperature T2 = 75 °C.
now, Q = mc (T2-T1 )
150200 J = m × 800 J/g °C ( 75 °C - 30 °C )
m = 150200 J/ 800 J/g × 45
m = 150200 g / 36000
m = 4.17 g
Thus, Granite has a specific heat of 800 J/g °C. the mass of granite is needed to store 150200 J from 30 °C to 75 °C is 4.17 g.
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imagine a beaker of water into which we place two drops of red food coloring and one drop of blue food coloring. the drops land in different places on the surface of the water. the concentration gradient acting on the red molecules would be
The concentration gradient acting on the red molecules would be stronger than on the blue molecules, but in a different direction.
Stronger than on blue molecules but in different direction because red molecules are having relatively higher density as compared to blue molecules because of 2 drops added. So the concentration gradient will be more and in opposite direction than blue.
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Four students were asked to complete a table for a science assignment. Each student selected one chemical element from each of four groups in the periodic table and then classified each element as a metal, a nonmetal, or a metalloid. Which table was completed correctly?
The table that was completed correctly is B.
Columns in the periodic table are called groups or families because of their similar chemical behavior. All members of the element family have the same number of valence electrons and similar chemical properties. The horizontal columns of the periodic table are called periods.
Moving periodically increases nuclear attraction due to increasing atomic number and decreases the atomic size. Therefore, elements cannot readily donate electrons. Therefore, group 17 elements are strong non-metals, and group 1 elements are strong metals. The elements are arranged in 7 horizontal rows called periods or series and 18 vertical columns called groups. Groups are labeled at the top of each column. In the United States, labels have traditionally been uppercase numbers.
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a bond between two atoms whose electronegativity values differ anywhere from 0.5 to 2.0 is considered ; whereas a bond between atoms whose electronegativities differ by 2.0 or more is considered . multiple choice question. polar covalent, ionic nonpolar, polar polar covalent, nonpolar
A bond between two atoms whose electronegativity values differ anywhere from 0.5 and 2.0 is called a polar covalent bond, whereas a bond between atoms whose electronegativities differ by 2.0 or more is considered an ionic nonpolar bond.
A covalent bond in which the atoms always have an unequal attraction for electrons which results in the unequal sharing of electron is a polar covalent bond.
If the difference in electronegativity is more than 1.7 or 2.0, ionic nonpolar bonds are formed as the ionic bonds are formed by the electron donation from the atom which is less electronegative to the atom which is more electronegative.
Electrons are shared in ionic and covalent bonds but differently. Non-polar or polar covalent bonds can be formed and they can react to electrostatic charges.
Ionic bonds are formed due to electrostatic force between negative and positively charged ions, thus, electronegativity is more than 2.0.
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for the sn2 reaction, draw the major organic product and select the correct (r) or (s) designation around the stereocenter carbon in the organic substrate and organic product. include wedge‑and‑dash bonds and draw hydrogen on a stereocenter.
For stereocenter carbons, the proper abbreviations are (S) for the organic substrate and (P) for the organic product (R).
This is further explained below.
What is a nucleophile?Generally, The reaction's substrate is denoted as S, and its output as R. because of it. The mechanism of the SN2 reaction may be stated succinctly as follows: This nucleophilic substitution procedure only needs one step.
The reaction is known as the SN2 reaction because two reactants are involved in the step that establishes the rate.
In the mechanism of the reaction, the nucleophile attacks the electrophile, leading to a transition phase in which the electrophile's alkyl group departs and the nucleophile forms a new bond with the still-present substrate.
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The atomic theory describes _____ because ____, ___ and ____
Atomic theory shows a ____, because ___,___,___
The atomic theory describes Dalton's theory because electron, proton and neutron.
The first a part of his theory states that every one matter is product of atoms, which might be indivisible. The second one part of the concept says all atoms of a given element are equal in mass and houses. The element says compounds are combos of two or extra distinctive forms of atoms.
One of the maximum essential merits of Dalton's atomic idea is the truth that the idea does no longer violate numerous fundamental laws of chemical combination consisting of the regulation of precise proportions, the regulation of multiple proportions, and the regulation of conservation of mass.
In 1803 Dalton located that oxygen mixed with both one or volumes of nitric oxide in closed vessels over water and this pioneering remark of fundamental more than one proportions supplied vital experimental proof for his incipient atomic thoughts.
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At a fixed temperature and pressure, the volume occupied by a gas is _____ proportional to the number of moles of gas present. For ideal gases under these conditions, equal _____ of gas contain equal numbers of particles or moles.
Answer:
Directly & Pressure
Explanation:
Oumm...I don't know if it's right but correct me if I'm wrong
6. Within how many hours are fingerprints still considered "fresh"? *
16 hours
O 48 hours
O24 hours
O 8 hours
Answer:
actually it depends on when and on what you had the finger print it could stay a couple of days, weeks or months and still be considered fresh
Butyric acid is responsible for the foul smell of rancid butter. the pkb of the butyrate ion is 9.16. (a) calculate the ka for butyric acid. (b) calculate the ph of a 0.075 m solution of butyric acid. (c) calculate the ph of a 0.075 m solution of sodium butyrate.
The acid dissociation constant for butyric acid is 0.0000145, pH value of its 0.075 M solution will be 2.98, and the pH value of 0.075 M solution of sodium butyrate will be 8.86.
a) The negative logarithmic values of the acid dissociation constant (Ka) for the acid and the base dissociation constant for the conjugate base (Kb) are always 14 in total:
pKa (acid) + pKb (conjugate base) = 14 ⇒ pKa = 14 - pKb
pKa = 14 - 9.16
pKa = 4.84
This means that the Ka for butyric acid is:
[tex]K_{a} = 10^{-4.84} = 1.45 * 10^{-5}[/tex]
b) The expression for butyric acid (HA) acid dissociation constant will look like this:
[tex]K_{a} = \frac{[H^{+} ][A^{-} ]}{[HA]} = \frac{X^{2} }{0.0075 - X}[/tex]
When transformed, this expression gives us a quadratic equation:
X² + Ka * X - 0.075 * Ka = 0
With familiar Ka, when we solve for X, we get:
X = 0.0010356 M = [H+]
We can use this to calculate the pH value of the solution:
pH = -log[H+]
pH = -log0.0010356
pH = 2.98
c) The expression for butyrate basicity will look like this:
[tex]K_{b} = \frac{[OH^{-} ][HA ]}{[A^{-} ]} = \frac{X^{2} }{0.0075 - X}[/tex]
When transformed, this expression gives a quadratic equation:
X² + Kb * X - 0.075 * Kb = 0
With familiar Ka, when we solve for X, we get:
X = 0.0000072 M = [OH-]
pOH = -log[OH-]
pOH = -log0.0000072
pOH = 5.14
pH = 14 - pOH
pH = 14 - 5.14
pH = 8.86
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What is the molar mass for fluoxetine
(C16H16F3NO), also known as Prozac®?
1. 281.3 g/mol
2.295.3 g/mol
3. 297.1 g/mol
4.279.3 g/mol
What is the ion symbol for the ion that has 15 protons and 18 electrons
Answer:ScienceBiochemistryQ&A LibraryAn ion has 15 protons, 16 neutrons, and 18 electrons. The symbol for the ion is 31P3+. 31P3-.
Explanation:
25. Which of the following correctly describes
density?
a. Density is a physical change
b. Density is a chemical change
c. Density is a physical property
d. Density is a chemical property
4Na(s) + TiCl4(1)→ Ti(s) + 4NaCl(s)
Calculate the mass of titanium that can be extracted from 570 kg of titanium chloride.
Relative atomic masses: Cl 35.5; Ti 48.
Convert your answer into grams.
The mass of titanium that can be extracted from 570 kg of titanium chloride is 144302.4 g.
Titanium chloride weighs 570 kg, or = 570000 / 189.6 moles. As 189.6 g make up 1 mole of titanium chloride, that equals 3006.3 moles.
Now, we can see from the equation that 1 mole of titanium chloride results in 1 mole of titanium.
Consequently, 3006.3 moles of titanium chloride are converted into 3006.3 moles of titanium.
Considering the atomic weights of Cl 35.5 and Ti 48
So, 48 x 3006.3 g times 3 moles of titanium equals 144302.4 g.
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What mass of oxygen is needed to produce 0.708 moles of propane?
(Step by step explanation, please )
C3H8 + 5O2 → 3CO2 + 4H2O
We can see that for every 1 mol of propane, there are 5 mols are oxygen.
If we have 5 grams of propane, how can we convert that into mols? We need to use the molar mass of propane, which is 44.1 g / mol. (12 g/mol x 3 + 1 g/mol x 8)
To convert to mols of propane: n (mols) = mass/molar mass -> 5/44.1 which equals 0.011 mols.
We said that for every 1 mol of propane, there are 5 mols of oxygen, correct? Therefore, 0.011 mols x 5 = 0.57 mols of oxygen needed to react with 5 grams of propane.
To convert 0.055 mols of oxygen to grams, we use the same equation. n = Mass/Molar Mass
0.57 = g/32, solve for the mass in grams of oxygen and we come to: 18.2 grams of Oxygen.
Chemistry full in the blanks, this is urgent
1. Atomic number is the relative atomic in an atom.
2. Mass number is the number of protons and neutrons in an atom
3. Isotopes are atoms with the atomic same but different mass due to the neutrons number of neutrons in the nucleus.
Atoms of many elements are in the form of molecules or ions because they are the most reactive. Examples are hydrogen oxygen chlorine and other elements. However non-reactive atoms of certain elements exist in nature in a free state. The relative atomic mass of an element is defined as the weight in grams of the number of atoms of that element in 12.00 grams of carbon-12.
The atomic mass of an element is the average mass of the atoms of the element measured in atomic mass units AMU, also known as Dalton D. Atomic mass is the weighted average of all isotopes of that element, the mass of each isotope multiplied by the abundance of that particular isotope. It is the ratio of the average atomic mass of the element from a single specific sample or source to the mass of the carbon-12 atom.
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How many moles of nitrogen atoms are there in 8.92 mol Ba(NO3)2?
Express your answer to three significant figures.
The number of moles of a nitrogen atom in 8.92 mol of Ba(NO₃)₂ is 17.8 moles of the Nitrogen atom.
The mole, image mol, is the unit of quantity of substance in the worldwide gadget of gadgets. the amount quantity of the substance is a measure of what number of primary entities of a given substance in an object or sample. The mole is described as containing precisely 6.02214076×10²³ essential entities.
The wide variety of basic entities in one mole is referred to as the Avogadro quantity. This definition supersedes the previous definition of a mole as the variety of elementary entities identical to that of 12 grams of carbon-12, the maximum commonplace isotope of carbon.
1 mole = 6.022×10²³ molecules
8.92 mol Ba(NO3)2 = 8.92 × 6.022×10²³ molecules
= 53.72 ×10²³
= 5.372 ×10²⁴ molecule
1 molecule of Ba(NO₃)₂ contain
1 atom of Ba
2 atoms of N
8 atoms of O
5.372 ×10²⁴ molecule = 2 × 5.372 ×10²⁴ atom of nitrogen
= 1.07 ×10²⁵ atom of Nitrogen. ( three significant figures)
moles of nitrogen atom = 1.07 ×10²⁵ atom of Nitrogen /6.022×10²³
= 17.8 moles of the Nitrogen atom.
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What is the mass of a substance that has a density of 9.1 g/cm3 and has the dimensions of 2 cm high, 2 cm long and 2 cm wide? (m=D x V)
The mass of the substance would be 72.8g
Given,
The density of the substance = 9.1g/cm³
The Length of the substance = 2cm
The Breadth of the substance = 2cm
The Hight of the substance = 2cm
We know,
Mass = Density × Volume
And
Volume = l×b×h
= 2×2×2
= 8 cm³
Therefore the mass of the substance
= D×V
= (9.1 × 8) g
= 72.8g
So, the mass of a substance will be 72.8g
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in an experiment, 200 g of aluminum (with a specific heat of 900 j/kgk) at 100 degrees celsius is mixed with 50.0 g of water at 20.0 degrees celsius, with the mixture thermally isolated. (a) what is the equilibrium temperature? what are the entropy changes of (b) the aluminum, (c) the water, and (d) the aluminum –water system?
(a) Water has a specific heat of 4190J/kgK while aluminum has a specific heat of 900J/kgK.
Therefore,
[tex]T_{f}[/tex]= (0.200kg)(900J/kg⋅K)+(0.0500kg)(4190J/kg⋅K) / (0.200kg)(900J/kg⋅K)(100°C)+(0.0500kg)(4190J/kg⋅K)(20°C)
= 57°C = 330K
(b) The following temperatures must now be stated in Kelvins: [tex]T_{ai}[/tex] = 393, [tex]T_{wi}[/tex] = 293
[tex]T_{f}[/tex] =330K dQ=[tex]m_{a}[/tex][tex]c_{a}[/tex] dT for aluminum, and the entropy change is
= Δ[tex]S_{a}[/tex] = ∫[tex]\frac{dQ}{T}[/tex] = [tex]m_{a}[/tex][tex]c_{a}[/tex] ∫(from [tex]T_{f}[/tex] to tai) [tex]\frac{dT}{T}[/tex] = [tex]m_{a}[/tex][tex]c_{a}[/tex] ln [tex]T_{f}[/tex]/ Tai
= (0.200kg)(900J/kg.K) ln (330K/373K)
= -22.1 J/K
(c) For water, the entropy change is
Δ[tex]S_{w}[/tex] = ∫[tex]\frac{dQ}{T}[/tex] = [tex]m_{w}[/tex][tex]c_{w}[/tex] ∫(from [tex]T_{f}[/tex] to tw1)[tex]\frac{dT}{T}[/tex] = [tex]m_{w}[/tex][tex]c_{w}[/tex] ln [tex]T_{f}[/tex]/ Twi
= (0.0500kg)(4190J/kg.K) ln(330K/373K)
= + 24.9J/K
(d) The change in the aluminum-water system's overall entropy is
ΔS=ΔSa+ΔSw =−22.1J/K+24.9J/K = +2.8J/K
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Lab Report Guide
2. What procedure did you use to complete the lab?
Outline the steps of the procedure in full sentences.
Answer:
To be lab-prepared one must follow these procedures-
1. One should have knowledge of lab assignments to make the lab experiment easier.
2. To be aware of safety equipment and its uses in the lab, like- the location of a fire extinguisher in the lab.
3. To know the steps of experiments to be performed
4. To fill the notebook of the lab with information regarding the experiment
5. One should review the data sheets of chemical material safety.
6. put on all the necessary dressings to perform the experiment.
7. To have a complete understanding of the experiment disposals.
What is the difference between a homogenous and a heterogeneous mixture? Give 3 examples of each mixture and explain its uses in our daily lives.
Answer:
By combining two or more substances, a mixture is produced. A homogeneous solution tends to be identical, no matter how you sample it. Homogeneous mixtures are sources of water, saline solution, some alloys, and bitumen. Sand, oil and water, and chicken noodle soup are examples of heterogeneous mixtures.
Explanation:
Answer the following questions about one molecule of glucose, C6H12O6.
(a) How many different elements are in the molecule? _____
(b) How many atoms of oxygen are in the molecule? _____
(c) What is the total number of atoms in the molecule? _____
Group of answer choices
24; 6; 1
3; 6; 6
3; 6; 24
3; 1; 4
Answer:
a)3
b)6
d)24
option c
Which element would an alien with ten mouths need? ( hint: group 6)
The element which an alien with ten mouths need is Tungsten ( W ).
Understanding the chemical element " Tungsten "Tungsten is an element in the periodic table which belongs to group vi. It is a transition metal. Transition metals has the ability to form complex ions. Alien such as those with ten mouths need tungsten for sustenance.
An element is a substance which cannot be split into smaller forms by ordinary process. The element in the periodic table are structured into groups and periods. The vertical arrangements of chemical elements in the periodic table is the group while the period is the horizontal arrangements.
Chemical elements are also classified as metals, nonmetals and metalloids.
So therefore, tungsten is needed by aliens.
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cecil is working with samples of chlorine (cl), oxygen (o), bromine (br), and silver (ag). the samples are all at room temperature. which substance is most likely the most dense?chlorineoxygenbrominesilver
Since the samples are all at room temperature, the substance which is most likely the most dense is: D. silver.
What is density?Density can be defined as a ratio of mass to the volume of a physical substance such as chlorine, oxygen, bromine, silver, etc.
Mathematically, the density of a physical substance can be calculated by using this formula:
D = M/V
Where:
D represents the density of a physical substance.M represents the mass of a physical substance.V represents the volume of a physical substance.At room temperature, the density of the given physical substances in an ascending order are as follows:
Oxygen = 1.49 g/LChlorine = 3.21 g/LBromine = 3100 g/LSilver = 10490 g/LIn this context, we can reasonably and logically deduce that silver is the most dense among the given physical substances.
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a mixture of ethanol and ethyl acetate is heated in a closed system at 100 kpa to a temperature of 74°c, and two phases are observed to be present. what are the possible compositions of the liquid and vapor phases?
The possible compositions of the liquid phases are: [tex]x_{1} =0.15[/tex] and [tex]x_{2} =0.79[/tex], while those of vapor phases are: [tex]y_{1} =0.2[/tex] and [tex]y_{2} =0.7[/tex]
The given binary mixture of ethanol and ethyl acetate at 100 kPa.
Given plot is temperature versus mole fraction (T-xy) at constant pressure 100 kPa.
In the given plot, the upper curve represents the dewpoint curve and lower curve represents bubble point curve.
At a given temperature 74 C, we can determine the mole fractions as follows:
1. We draw a horizontal lie from 74 °C mole fraction 0 to 1 and it touches lower curve at two points and upper curve at two points.
2. We also draw a vertical line from points where it touches the lower curve gives the composition of liquid and draw a vertical line from points where it touches the upper curve gives the vapor compositions.
From the plot given below, the compositions of liquid where the vertical line touches lower curve are: [tex]x_{1} =0.15[/tex] and [tex]x_{2} =0.79[/tex]
And those for vapor phases where the line touches the upper curve are:
[tex]y_{1} =0.2[/tex] and [tex]y_{2} =0.7[/tex]
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This passage is part of a report of a science
experiment.
The solution contains water and the unknown
second substance. The solution was heated
gradually, and it began boiling at 80°C. The
gas rose through a glass tube that led to a
cold flask. A clear, colorless liquid formed in
the flask.
What was the purpose of boiling the solution?
Select the words from the drop-down menus
to correctly complete the explanation.
The solution was boiled to Choose.. the
solution. Because water Choose.. boil at
80°C, the clear, colorless liquid that formed in
the flask must have been
Choose...
The temperature at which a liquid's vapour pressure equals the pressure around it and the liquid transforms into a vapour is known as the boiling point of a substance. A liquid's boiling point varies depending on the atmospheric pressure in the area.
A liquid partially vaporises into the space above it at any temperature up until the vapour pressure of the liquid at that temperature, which is a characteristic value. When a liquid reaches its boiling point, vapour bubbles form inside the liquid and rise to the surface as the temperature rises, increasing the vapour pressure.
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PLEASeee helppp in class rn. Pleaseee with 2,3, and 4.
There are 115 protons in the element 115 and due to the large number of protons, the element does not exist in nature.
Also, the element can not be isolated in nature that is IUPAC had to require an independent confirmation of the element.
What is element 115?We know that the periodic table is an arrangement of the atoms in order of increasing atomic number. We know that the larger the atomic number of the element, the less likely that the element would be stable in nature. The element that have been named 115 is called Moscovium and was discovered in Moscow as a product of a radioactive experiment. The number of protons in element 115 is 115 protons
Generally, the element number 115 does not exist in nature because if the proton number in an element exceeds 82, the repulsion between the protons would make it almost impossible for the nucleus to be a stable nucleus.
The reason why IUPAC had to request an independent confirmation of the element is because it does not exist in nature.
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Matter that can be described as "uniform" or "continuous" is
While heterogeneous matter (from the Greek hetero = different) suggests non-uniformity and discontinuity, homogeneous matter (from the Greek homo = same) can be thought of as being uniform and continuous.
What is an example of a homogeneous matter?Materials that are homogeneous lack borders, are uniform throughout, and have all of its component elements in the same state. Homogeneous mixtures also include air we and the water we drink from the faucet. Quality is related are also alluded to as solutions.
What is homogeneous matter?Whether a mixture is solid, liquid, or gaseous, homogeneous mixtures have the same ratios of their component parts throughout a particular sample. Its composition remains the same throughout. There is just one visible phase of substance in a homogeneous combination.
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Which option contains a true statement about cell theory?
O Louis Pasteur did an experiment that proved new cells come from the rotting remains of organisms.
Theodor Schwann did an experiment that proved new cells come from the rotting remains of organisms.
Louis Pasteur did an experiment that proved new cells come from existing, living cells.
Theodor Schwann did an experiment that proved new cells come from existing, living cells.
Anatomist and physiologist Theodor Schwann is best known for formulating the cell doctrine, which holds that all living things are made up of cells.
What is meant by cell theory?Theodor Schwann put forth the classical cell theory in 1839. This theory consists of three parts. All organisms are composed of cells, according to the first section. The basic building blocks of life exists cells, according to the second section.
Anatomist and physiologist Theodor Schwann is best known for formulating the cell doctrine, which holds that all living things are made up of cells. He proved that the cell is the fundamental building block of all living things.
All known living things are composed of one or more cells, according to the modern cell theory. By dividing, pre-existing cells become all living cells. All living things have cells as their basic unit of structure and operation.
Therefore, the correct answer is option d) Theodor Schwann did experimentation that demonstrated new cells come from existing, living cells.
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why do substances exist in liquids solids or gasses
Matter exists in different states such as solid, liquid and gas because of the kinetic energy of its particles and the intermolecular force of attraction between the particles.
A substance won't condense into a liquid or solid if the average kinetic energy is higher than the attraction forces holding the particles together.
Thus in solids, intermolecular force of attraction > kinetic energy of particles.
In a liquid (or solid), the average kinetic energy of the particles is low enough to allow the forces of attraction to hold the particles together. In a liquid (or solid), molecules do not separate.
In liquids, intermolecular force of attraction > kinetic energy of particles. But this force of attraction is smaller than solids.
The forces of attraction between the particles in a gas can be overcome by the average kinetic energy of the particles in the gas. When gas molecules collide, they spread apart.
In gas, intermolecular force of attraction < kinetic energy of particles.
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