pH value of a 0. 011 m naf solution is 8.57.
Solution
This problem uses the relationship between Kb and the dissociation constants which is expressed as Kw = KaKb. Calculations are as follows:
Kb = KaKb
1.00 x 10^-14 = 7.2 x 10^-4(x)
x = 1.39 x 10^-11
We now need to calculate the [OH¯] using the Kb expression:
1.39 x 10^-11 = x^2 / (0.30 - x)
The denominator can be neglected. Thus, x is 3.73 x 10^-6.
pOH = -log 3.73 x 10^-6 = 5.43
pH = 14-5.43 = 8.57
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How would you separate a mixture of 4-tert-butylphenol and 2- chlorobenzoic acid? Explain the detailed steps including the choice of solvent and why this solvent would be use.
The a mixture of 4-tert-butylphenol and 2- chlorobenzoic acid is separate by the by using bicarbonate solvent.
When solution of bicarbonate is added in mixture of 4-tert-butylphenol and 2- chlorobenzoic acid then 2- chlorobenzoic acid form a carboxylate ion whereas 4-tert-butylphenol is underacted and filtered out.
Since, only 2- chlorobenzoic acid which is acid is convert into its conjugate base by solution of bicarbonate in mixture of 4-tert-butylphenol and 2- chlorobenzoic acid .
However, phenol is less acidic than carboxylic acid. Both phenol and carboxylic acid is soluble in organic solvent . At that point as the phenol isolates as an oil, one needs to cool the blend in an ice shower to encourage crystallization
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Which of these molecules have all atoms lying in the same plane? a. cbr4 and nh3 b. pf5 c. nh3 and hcn d. so3 and hcn
Molecules having all atoms lying in the same plane is c) HCN
HCN is a molecule in which all the atoms in the same plane i.e. it is a Planar molecule.
A Planar molecule is the one in which atoms are arranged in same plane i.e. atoms arrange themselves to exist in a two dimensional plane around the central atom.
The presence of double bond or triple bond in a molecule allows the molecule to get arranged in a plane.
The presence of triple bond in HCN allows it to be arranged in a plane.
HCN to be specific is a Linear molecule in which the angle between H and CN is 180.
The bond between C and N atom is a triple bond containing two pie bonds and one sigma bond.
Hence c) HCN is a planar molecule.
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What impact would adding twice as much na2co3 than required for stoichiometric quantities have on the quantity of product produced?
The product will not be affected by the addition of twice as much Na₂CO₃.
What is Limiting reagent in stoichiometry ?The maximum quantity of the end product determined by a balanced chemical equation is known as the Stoichiometry.The limiting reactant is the one that is consumed first and sets a limit on the quantity of product(s) that can be produced, and the one which remains unconsumed after the final reaction is in Excess.Calculate the moles of each reactant present and contrast it with the mole ratio of the reactants in the balanced equation to determine which reactant is the limiting one.Here,taking the stoichiometry into consideration, we find that the reaction happens with 1:1 ratio; so, adding twice the amount of Na₂CO₃ will lead to its excess making the other the limiting reactant, hence, it would not affect the yield of the product.
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A glow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.
A glow stick will glow longer at lower temperatures than at room temperature, one can infer from the observation. Temperature and reaction time are the test variables.
We notice in this reaction that a glow stick stored in the freezer lights for a longer period of time than a glow stick stored at normal temperature. This implies that temperature affects how long a response lasts.
The most straightforward explanation for this observation is that glow sticks glow longer in colder temperatures than they do at room temperature; as a result, glow sticks kept in the freezer are observed to glow longer than glow sticks kept at room temperature.
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Calculate the ph after 10. 0 ml of 0. 40 m naoh is added to 20. 0 ml of 0. 50 m hc.
The pH is 13.31.
The smaller the pH value the more acidic, the larger the pH value the more basic.
The range is 0 to 14, with 7 representing neutrality. Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7.
Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per liters of a solution.
Molarity of NaOH = 0.40 M
Volume of NaOH = 10.0 mL
Molarity of HCL = 0.50 M
Volume of HCL = 20.0 ml
[tex][OH^-] = (M_2V_2 -M_1V_1)/(V_1+V_2)\\[/tex]
[tex]= (0.50*20.0 - 0.40*10.0) / (20+10)[/tex]
[tex]= (10 -4)/ 30\\[/tex]
[tex]= 6/30[/tex]
[tex]=0.2[/tex]
[tex]pOH = - log (OH ^-)[/tex]
[tex]pOH = - log (0.2)\\[/tex]
[tex]pOH = - ( - 0.698)[/tex]
[tex]pOH = 0.69[/tex]
[tex]pH + pOH = 14[/tex]
[tex]pH = 14 -0.69[/tex]
[tex]pH = 13.31[/tex]
Therefore, the pH after 10.0 mL of 0.40 M NaOH is 13.31.
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If ionizing radiation interacts with a human cell, causing it to die after one or more divisions, it is classified as:____.
If ionizing radiation interacts with a human cell, causing it to die after one or more divisions, it is classified as mitotic death.
Hence, Option C is correct answer.
What is Ionizing radiation ?Ionizing radiation is a form of energy which is released by atoms that travels in the form of electromagnetic waves.
Examples: Heat or light from the Sun.
What is Mitotic Death ?Radiation damage to the cell death occurs when cells to attempt to divide with the damaged DNA.
Thus from the above conclusion we can say that If ionizing radiation interacts with a human cell, causing it to die after one or more divisions, it is classified as mitotic death.
Hence, Option C is correct answer.
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Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Question: If ionizing radiation interacts with a human cell, causing it to die after one or more divisions, it is classified as
(A) interference of function
(B) mitotic delay
(C) mitotic death
(D) reproductive death
The isotope ra decays to rn by emitting radiation. What type of radiation is emitted?
Heavy elements such as radium, uranium, and thorium, all have alpha decaying nuclei. An Rn (radon) nuclei are created when a Ra (radium) nucleus decays, emitting an alpha particle in the process.
Discussion about radiation:
The radioactive process known as alpha decay, sometimes known as α radiation, involves the ejection of an alpha particle from the nucleus, which includes 2 neutrons and 2 protons.
A helium atom's nucleus and an alpha particle have many similarities. Instability is seen as being present in all nuclei with an atomic number (Z) more than 82. These are frequently subject to alpha decay and are thought to be "neutron-rich." Heavy elements such as radium, uranium, thorium, etc., all have alpha decaying nuclei. An Rn (radon) nucleus is created when a Ra (radium) nucleus decays, emitting an alpha particle in the process.The mass number (A) and atomic number (Z) are typically lowered by two and four, respectively, during alpha decay. For instance, Ra-226 with atomic numbers 88 and 226 is converted into Rn-222 with the mass number 222 and atomic number 86 by alpha decay.Learn more about alpha decay here:
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How many moles of argon are in 13.9 g of argon?
Answer:
0.348 moles Ar
Explanation:
You can determine the moles of argon (Ar) by multiplying the given mass by the atomic mass of argon. This number gives the mass in grams per 1 mole. It is important to arrange the conversion in a way that allows for the cancellation of units. The final answer should have 3 significant figures to match the sig figs of the given value (13.9 = 3 sig figs).
Atomic Mass (Ar): 39.948 g/mol
13.9 g Ar 1 mole
----------------- x ------------------ = 0.348 moles Ar
39.948 g
Which carboxylic acid derivative can be made from another carboxylic acid derivative by a dehydration reaction?
Acid nitric oxide
When a carboxylic acid combines with an acid chloride in the presence of a base, anhydrides are frequently produced.
The Fischer esterification, which involves reacting a carboxylic acid with an alcohol to produce an ester: RCO2H + R′OH RCO2R′ + H2O, is a well-known example of a dehydration reaction. The presence of a dehydrating agent, or a chemical that reacts with water, is frequently necessary for these processes.
Although an ester is produced when an acyl chloride and an alcohol react, this conversion cannot be stopped by adding HCl to the reaction mixture. One of the most popular carboxylic derivatives is esters.
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A volume of oxygen gas occupies 38. 7 ml at 751 mmhg and 21°c. what is the volume if the pressure changes to 359 mmhg while the temperature remains constant?
Answer:
80.96 L
Explanation:
START WITH
P1 V1 = P2 V2
V2 = P1 V1 / P2
= 751 * 38.7 / 359 = 80.96 L
According to Boyle's law, where the temperature remains constant the volume of the gas if the pressure changes to 359 mm Hg is 80.95 ml.
What is Boyle's law?Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.
Mathematically, it can be stated as,
P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.
According to the equation the unknown pressure and volume of any one gas can be determined if two gases are to be considered.That is,
P₁V₁=P₂V₂
Substitution in the above equation gives ,V₂=751×38.7/359=80.95 ml.
Thus, the volume of gas at 359 mm Hg pressure is 80.95 ml.
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three difference between radicle and plumule
Answer:
1)RADICLE ->It is the embryonic root of the plant.
PLUMULE ->It is the embryonic shoot of the plant.
2)RADICLE ->It grows downwards into the soil.
PLUMULE ->It grows upwards into the air.
3)RADICLE ->Radicle is the first part of the seedling.
PLUMULE -> Plumule grows after the radicle.
4)Radicles are negatively phototropic. Plumule is positively phototropic.
i am glad i helped
Calculate the approximate amount os sodium hydroxide needed to make 500ml if a. 3 naoh solution.
6 gram of sodium hydroxide (NaOH) needed to make 500ml if 0.3 NaOH solution.
What is molarity?Molarity (M) is the amount of a substance in a certain volume of solution.
Molarity is defined as the moles of a solute per liters of a solution.
The unit of molarity is mol/L.
Volume of NaOH = 500 mL
Molarity of the aqueous solution = 0.3 M
Molar mass of NaOH= (23+16+1) g = 40g
Let the mass of NaOH be X.
Now , according to formula number of moles of a given substance = given mass / molar mass
Therefore, no. of moles of NaOH = X/40
Since, molarity = number of moles of solute/ volume of solution in liter.
Hence, 0.3 = ( X /40) / (500 / 1000)
Solving this we get X= 6g
6 gram of sodium hydroxide (NaOH) needed to make 500ml if 0.3 NaOH solution.
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Select the correct boxes. which two elements have the same number of valence electrons?
Carbon and silicon have same number of valance electrons which is 4 electrons
Now, Barium is a 2nd group element. So, it has two valance electrons.
Silicon is a 16th group element and it has 4 valance electrons as does the carbon. This is because they both stay in the same group in the periodic table.
Neon is a noble gas which has 8 valance electrons and stays in the 18th group.
Therefore, carbon and silicon have same number of valance electrons which is 4 electrons.
What are Valence electrons ?The electrons in an atom's outermost shell, or energy level, are called valence electrons. For instance, the valence electrons of oxygen are six, with two in the 2s subshell and four in the 2p subshell.
The number of valence electrons for neutral atoms is the same as the number of the atom's main group. A periodic table element's column can be used to determine its main group number. For instance, carbon, which belongs to group 4, has four valence electrons. Group 6 oxygen contains six valence electrons.Learn more about Valence electrons here:
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How many moles of na2co3 are necessary to reach stoichiometric quantities with cacl2
0.0102 moles Na₂CO₃ = 1.08g of Na₂CO₃ is necessary to reach stoichiometric quantities with cacl2.
Explanation:Based on the reaction
CaCl₂ + Na₂CO₃ → 2NaCl + CaCO₃
1 mole of CaCl₂ reacts per mole of Na₂CO₃
we have to calculate how many moles of CaCl2•2H2O are present in 1.50 g
We must calculate the moles of CaCl2•2H2O using its molar mass (147.0146g/mol) in order to answer this issue. These moles, which are equal to moles of CaCl2 and moles of Na2CO3, are required to obtain stoichiometric amounts. Then, we must use the molar mass of Na2CO3 (105.99g/mol) to determine the mass:Moles CaCl₂.2H₂O:1.50g * (1mol / 147.0146g) = 0.0102 moles CaCl₂.2H₂O = 0.0102moles CaCl₂
Moles Na₂CO₃:
0.0102 moles Na₂CO₃
Mass Na₂CO₃:
0.0102 moles * (105.99g / mol) = 1.08g of Na₂CO₃ are present
Therefore, we can conclude that 0.0102 moles Na₂CO₃ is necessary.to reach stoichiometric quantities with cacl2.
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What type of response to chemical exposure is an immediate or rapid harmful reaction?.
An acute impact is a detrimental reaction to an exposure that occurs immediately or quickly.
A chronic impact is a long-term/permanent result of a single dosage or repeated lesser doses of a toxic drug.
What type of effects occur immediately following a chemical exposure?Acute (short-term) effects appear immediately or shortly after chemical exposure. They might be mild, such as nose or throat discomfort, or serious, such as eye damage or passing out from chemical fumes. All of these effects have one thing in common: they occur immediately.
What are the types of chemical exposure?The many methods in which a person might come into contact with dangerous substances are referred to as exposure routes. There are three primary routes of exposure: inhalation, ingestion, and skin contact.
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How much water would need to be added to 750 ml of a 2.8 m hcl solution to make a 1.0 m solution?
1.35 Litres of water need to be added to 750 ml of a 2.8 m hcl solution to make a 1.0 m solution.
Use the following relation:
M1V1=M2V2
Where M is molarity, V is volume and 1 is initial and 2 is the final conditions. Solving for V(2)
M1=2.8 M,V1=750 mL;M2=1.0 M
(2.8 M)×(750 mL)=(1.0 M)×V2
V2=(2.8 M)×(750 mL)(1.0 M) = 2100 mL = 2.1 L
Therefore, Volume of water to be added =2.1 L−0.75 L=1.35 L
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What is the molar solubility of a saturated solution of magnesium hydroxide, mg(oh)2, in water? the ksp of mg(oh)2 is 1. 2×10^–11
The molar solubility of saturated solution of magnesium hydroxide in water will be 1.4 × [tex]10^{-4}[/tex].
The concentration of such ions in a suitable solvent that will be in equilibrium with both the solid substance is known as the solubility product, or Ksp, of such an ionic compound.
When a chemical substance in the solid form would be in chemical equilibrium with such a solution of that molecule, a solubility equilibrium would be a sort of dynamic equilibrium that develops.
The molar solubility of magnesium hydroxide can be expressed as:
[tex]K_{sp} = [Mg^{2+} ][OH^{-} ]^{2}[/tex]
Let the molal solubility will be S.
[tex]K_{sp} = S(S^{2} )\\1.2 * 10^{-11} = 4S^{3} \\(S)^{3} = 0.3 *10^{-11} \\S = 1.4 *10^{-4}[/tex]
Therefore, the molar solubility of saturated solution of magnesium hydroxide in water will be 1.4 × [tex]10^{-4}[/tex].
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Rounding to the nearest
tenth, what is the mean of
85, 85, 100, 90, 100, 85,
80, 100, 90?
For calculating mean value, add up all of the values then divide by the number of them. 815/9 is about 90.6
What is mean value?The mean refers to the average of a set of values. The mean can be computed in a number of ways, including the simple arithmetic mean (add up the numbers and divide the total by the number of observations), the geometric mean, and the harmonic mean.
Moreover, the mean can be used to represent the typical value and therefore serves as a yardstick for all observations. For example, if we would like to know how many hours on average an employee spends at training in a year, we can find the mean training hours of a group of employees.
Hence, the mean can be calculated only for numeric variables, no matter if they are discrete or continuous. It's obtained by simply dividing the sum of all values in a data set by the number of values.
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A substance with a high [h ] would likely have which additional characteristics?
Answer:
Is [h] really [H]? What characteristics are mentioned?
Explanation:
A high [H} means high acid concentration.
The reaction na 3po 4( aq) 3 agno3( aq) → ag 3po 4( s) 3 nano 3( aq) is best classified as a(n):_____.
The reaction [tex]Na_{3} PO_{4} ( aq) +3AgNO_{3} (aq)[/tex] → [tex]Ag_{3} PO_{4} ( aq) +3NaNO_{3} (aq)[/tex] is best classified as double displacement reaction.
Those reaction in which two compounds react by exchanges of ions to form two new compounds is called double displacement reaction. The easiest way to identify double displacement reactions is to check to see whether the cations exchanged anions with each other or not . Always balanced chemical equation is used to determine.
There are three types of double displacement reaction which is given as,
Precipitation Neutralization Gas formationThe real world example of double displacement reaction is combining vinegar and baking soda to create homemade volcano.
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Chemical reactions can be detected by: _________
a) color change from reactants to products
b) the production of a precipitate
c) a change in temperature
d) an increase of surface area
(A) Color changes from reactant to products.
The rate of a chemical reaction is calculated by dividing the rate of change in a reactant or product's concentration by the coefficient from the equation's balanced state.
2N2O5(g) → 4NO2(G) + O2(g)
A change in color and the appearance of bubbles are two indications of a chemical shift.In a chemical process, the makeup of the components changes; in a physical change, the appearance, smell, or straightforward exhibition of a sample of matter changes without changing its composition.
Despite the fact that we refer to them as physical "reactions," nothing is actually changing. A change in the substance in question's elemental composition is necessary for a reaction to occur. Therefore, from now on, we will simply refer to bodily "reactions" as physical changes.
Physical modifications must only cause a variation in display without altering the composition. Typical modifications include, but are not limited to:
Texture\Color\Temperature\Shape
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Choose the molecules that contains sphingosine.
a. sphingomyelins molecule
b. molecule
c. molecule
d. a phosphatidylcholine
Answer:
a phosphatidylcholine
The molecule that contains sphingosine is a phosphatidylcholine compound.
What is a compound?
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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What reagent is needed to convert 1-hexyne to 2-hexanone?
(a) o3 /zn/ h3o
(b) pcc (pyridinium chlorochromate)
(c) bh3 /h2o2 /oh-
(d) h2o/h
The reagent is needed to convert 1-hexyne to 2-hexanone is [tex]H_{2}O /H^{+}[/tex].
So , option D is correct one.
Ozonolysis is used to form aldehyde and ketone from alkene not alkyne .So option A is incorrect .
The reagent PCC is used as an oxidant and is used to convert primary and secondary alcohol into aldehyde and ketone.
The [tex]BH_{3} /H_{2} O_{2} /OH^{-}[/tex] is used to convert alkene into alcohol which is known as hydroboration reaction.
The addition of a hydroxyl group to an alkyne causes tautomerization which subsequently forms a carbonyl Markovnikov addition of a hydroxyl group to an alkyne forms a ketone. So, [tex]H_{2}O /H^{+}[/tex] is used to convert alkyne into ketone.This reagent is needed to convert 1-hexyne to 2-hexanone.
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What is the C-terminal amino acid in the tetrapeptide
Val-Thr-Phe-Pro?
O threonine
O phenylaline
O valine
O proline
The C-terminal amino acid in the tetrapeptide is valine.
Valine is one of three branched-chain amino acids that enhance energy, increase endurance, and aid in muscle tissue recovery and repair. This group also lowers elevated blood sugar levels and increases growth hormone production.
The cease with a free carboxyl group is called the C-terminal amino acid residue. Peptides are named from the N-terminal acid residue to the C-terminal amino acid.
The C-terminal amino acid may be decided by way of addition of carboxypeptidases, enzymes which cleave amino acids from the C-terminal. A time direction ought to be carried out to look which amino acid is launched first.
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The C-terminal amino acid in the tetrapeptide is c) Valine.
The C-terminal amino acid is direct confirmation of the sequence of C terminal of the proteins that are expressed. It is present at the end of the protein sequence. A free carboxyl group is called the C-terminal amino acid residue.
A tetrapeptide is a chain containing four amino acids producing a Chain of amino acids.
Valine is three branched chain amino acids that is needed for protein synthesis. It enhances:
- Energy
- Muscle Growth
- Muscle Regeneration
- Increase endurance
- Muscle Recovery
Valine lowers elevated blood sugar levels. Also, it increases growth hormone production in the body.
Valine is found through following food:
MeatFishSoyDairyPeptides are named from the N-terminal acid residue present in the start to the C-terminal amino acid present at the end.
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A blue train of mass 50 kg moves at 4 m/s toward a green train of 30 kg initially at rest. The trains collide. After the collision the green train moves with a speed of 3 m/s. What is the final momentum of the blue train?
A. 110 kgm/s
B. 200 kgm/s
C. 20 kgm/s
D. 90 kgm/s
There are three major parts within each dna nucleotide. of these three, which is responsible for the storage of genetic information?
Carbon dioxide is considered a waste product of cellular respiration.
a. true
b. false
Answer: True
Explanation:
The external expression of a mineral’s orderly internal arrangement of atoms is referred to as:____.
The external expression of a mineral’s orderly internal arrangement of atoms is referred to as its crystal form
Internally, a mineral's crystal structure, or regular, repeating arrangement of atoms, reflects the chemical makeup of the mineral. A CHEMICAL FORMULA, which only lists the proportions of the various elements and groups of elements in the mineral, can be used to describe the composition of a mineral. For minerals with a narrow range of composition, the latter idea—groups of elements—comes into play. Color, hardness, luster, crystal formations, density, and cleavage are characteristics that aid geologists in determining a mineral's identity in a rock. The atomic structure of a crystal essentially determines its form, cleavage, and hardness. Chemical composition is the main determinant of color and density.
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Write the mass of a neutron without using scientific notation and powers of ten. Include units in your answer.
{not a bot question} {physical science 1110}
The mass of a neutron without using scientific notation and powers of ten. The mass of a neutron is slightly greater than the mass of a proton, which is 1 atomic mass unit (AMU).
Particle Symbol Mass (amu)
proton p+ 1
electron e− 5.45 × 10−4
neutron n0 1
A neutron is an atom with the atomic number 10. Its atomic mass is 20.179, resulting in 10 neutrons and 10 protons in the nucleus, and 10 electrons outside. Neon; Neon, Ne is a colorless noble gas and also the second lightest noble gas. Neutron and proton masses are 1.0087 amu and 1.0073 amu respectively.
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Why is 15 m acetic acid an appropriate solvent in which to perform rate studies of electrophilic bromintations?.
15M acetic acid an appropriate solvent in which to perform rate studies of electrophilic bromintations as Acetic acid activates the bromine and makes it a better electrophile.
What is electrophilic halogenation?
In organic chemistry, an electrophilic aromatic halogenation is a type of electrophilic aromatic substitution. This organic reaction is typical of aromatic compounds and a very useful method for adding substituents to an aromatic system.Halogenation of Benzene where X is the halogen, catalyst represents the catalyst (if needed) and HX represents the protonated base.A few types of aromatic compounds, such as phenol, will react without a catalyst, but for typical benzene derivatives with less reactive substrates, a Lewis acid catalyst is required. Typical Lewis acid catalysts include AlCl3, FeCl3, FeBr3 and ZnCl2. These work by forming a highly electrophilic complex which is attacked by the benzene ring.To learn more about electrophilic halogenation: https://brainly.com/question/26831851
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