When there is 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl, and the pH mathematically given as
pH=4
The indicator is Methyl red
What is best for titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl?Generally, the equation for the Chemical Reaction is mathematically given as
HCl +BOH--->BCl+H20
Therefore
pH=0.5(pkw-pkb-logl)
pH=0.5()14-5.8-logl
pH=4
In conclusion, The best indicator should have pKa =pH
Hence
Methyl red is best
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The best indicator to use when titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl is methyl orange.
What is an acid-base indicator?An acid-base indicator is a substance which change colour or develop turbidity at a particular pH.
Acid-base indicators are used during acid-base titrations to detect when neutralization has occured.
The indicators to be used when combining acid and base are as follows:
Strong acid-strong base - PhenolphthaleinWeak acid-strong base - PhenolphthaleinStrong acid-weak base - Methyl orangeMorphine is a weak base while hydrochloric acid is a strong acid.
Therefore, the best indicator to use when titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl is methyl orange.
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Some of the physical characteristics of the planets in the Solar System are shown below. The distance of each planet from the Sun is given in astronomical units (AU).
PHYSICAL DATA OF PLANETS
Planet Distance from the Sun (AU) Mass (kilograms) Mean Orbital Speed (kilometers/second)
Mercury 0.38 3.33 x 1023 47.87
Venus 0.72 4.87 x 1024 35.02
Earth 1.0 5.97 x 1024 29.78
Mars 1.5 6.47 x 1023 24.13
Jupiter 5.2 1.90 x 1027 13.07
Saturn 9.5 5.68 x 1026 9.69
Uranus 19.2 8.68 x 1025 6.81
Neptune 30.1 1.02 x 1026 5.43
Which conclusion can most accurately be drawn from this information?
Which pair of elements has reactivity that is similar to chlorine, cl?.
Answer:
Both chlorine and bromine lies in the same group therefore they have similar properties.
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Fluorine, bromine and iodine will have same properties in terms of reactivity.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
The elements belonging to same group have same period. Chlorine belongs to group 17 that is to the halogen family. The elements that are in the same group of chlorine are Fluorine, bromine and iodine. Since these elements contains same number of electrons that is 7 in its outermost shell, behave equally in terms of reactivity.
Therefore, fluorine, bromine and iodine will have same properties in terms of reactivity.
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Which effect is one likely result of a forest fire? extinction adaptation speciation forced migration
Forced migration effect is one likely result of a forest fire condition.
What is migration?Migration is a process in which group of species like birds, animals or any living organism will go from one place to other place.
When in the forest if fire is placed then in this condition, living organism of forests such as birds, insects, animals and mammals will go to other place without their willingness. This type of migration is known as forced migration.
Hence, option (d) is correct i.e. forced migration.
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Answer:
forced migration
Explanation:
Organisms will be forced to move from their natural habitat if a forest fire takes place. This is because they will have to move from their devastating habitat to an area that is less threatening and safer for survival.
Therefore, the answer is forced migration.
1. Write two factors that determine the reactivity of elements. Among the given alkali metal which is the most reactive de why?
Group IA
H
Li
Na
K
Will get brainliest..if it's right..
Answer:
One Factor Is Ionization Energy
Another Factor Is The Electronegativity Of The Element
K is the most reactive metal from the given as it is more electronegativity..... and the valence electron are close to the nucleus...
Explanation:
Hope it helps!!!
Answer:
Potassium (K)
Explanation:
It has the furthest distance from the nucleus and the outer most electron shell meaning that the forces between the two are weaker which as a result makes it easier for Potassium to lose it's outer electron.
fine the moles in 15.9 grams of SiO2
Answer:
.265 mol
Explanation:
We want to find the number of moles in 15.9 grams of SiO2
First we need to find the molar mass of SiO2
Looking at a periodic table 1 atom of Si has a mass of 28.086g
And 1 atom of oxygen has a mass of 15.999g
So the molar mass of SiO2 would be 28.086(1) + 15.999(2) = 60.084g/mol
Now we can use dimensional analysis to find the number of moles in 15.9 grams of SiO2
Setting up the table we get
[tex]\frac{15.9gSiO_2}{} *\frac{1 molSiO_2}{60.084gSiO_2}[/tex]
the g SiO2 cancels out and we get
[tex]\frac{15.9}{} *\frac{1 molSiO_2}{60.084}[/tex]
we then evaluate 15.9 * 1/60.084 to get .265 mol
So there are .265 moles in 15.9 grams of SiO2
Classify the following compounds as an Arrhenius acid or an Arrhenius base.
H2S ____________
RbOH____________
Mg(OH)2 ____________
H3PO4____________
Arrhenius :
acid: a compound that releases H⁺ ions in water
base: a compound that releases OH⁻ ions in water
H2S Arrhenius acid
RbOH Arrhenius base.
Mg(OH)2 Arrhenius base.
H3PO4 Arrhenius acid
Convection creates circulating current in a pot of boiling water because _____ water rises and ____ water sinks
The answer should be 'hotter' and 'cooler'
The hot water molecules would become less dense and thus rise above the denser cooler molecules.
Hope that helps!
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The HR diagram includes data on many common stars that can be found in the night sky. Based on the data in the diagram, what is the relationship between temperature and absolute brightness in the main sequence stars?
As the star's temperature increases, absolute brightness will be unpredictable.
As the star's temperature increases, absolute brightness will stay the same.
As the star's temperature increases, the absolute brightness will decrease
As the star's temperature increases, the absolute brightness will increase.
Answer:
The higher the temperature, the brighter the star.
Explanation:
The trait for rabbit fur follows an inheritance pattern of incomplete dominance. If a rabbit with short fur and a rabbit with long fur mate, what length fur will the offspring have?
Answer:
medium length fur
Explanation:
incomplete dominance is when the two traits kind of combine. u would have to make a punnet square, but in short, 100% of the offspring would have medium length fur
3. What is the total number of N, atoms in 56.0 grams of nitrogen gas at STP?
And: 89.53L
Explanation:
if u can't see the pic I'm sorry and ik my handwriting is sloppy. (I'm working on it) :)
what reactions happen when you put sodium in water?
What type of reaction would the heat calculation in previous question be classified as?
Select one:
a. Chemical
b. Natural
c. Exothermic
d. Endothermic
CLAIM:Pennies are not all copper.
EVIDENCE:The density of copper bar is 8.4 g/cm^3, while the pennies have a density of 6.9 g/mL.
Reason:If the density of the pennies are not the same as the copper bar. The pennies can't be pure copper.
My teacher wants me to find out why pennies are not all copper.
Answer:
Explanation:
Mint produced more than 130 billion pennies. Then, in 1982 the Mint introduced a penny that is 97.6 percent zinc and only 2.4 percent copper with a density of 7.2 g/mL. By comparison, the old pre-1982 copper pennies were 95 percent copper and 5 percent zinc with a density of 8.8 g/mL.
Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients. Br2(l) + I2 (s) --> IBr3(g)
Answer:
3 Br₂(l) + I₂ (s) --> 2 IBr₃ (g)
Explanation:
After multiplying the coefficients and the subscripts, this would leave you with:
Reactants: 6 Br and 2 I
Products: 6 Br and 2 I
These are the lowest possible coefficients because you cannot further divide the coefficients and still get a whole number.
A canister of neon contains 4. 8x10^24 atoms of the gas. How many moles of neon are present in the canister?
Answer:
13.28 moles
Explanation:
A mole is avogadro's number of atoms, or 6.022*10^23 atoms. You just have to divide the amount of atoms by avogadro's number to get the amount of moles. (8*10^24)/(6.022*10^23)=13.28 moles of neon
[tex]need \: help \: please \: asap :([/tex]
1. The smallest particle of an element is?
A. Molecule
B. Atom
C. Debris
D. Fillet
2. The smallest particle of matter is?
A. Molecule
B. Atom
C. Debris
D. Fillet
I'LL MARK AS THE BRAINLIEST WHOEVER ANSWER THIS ACCURATELY..
Answer:
1. The smallest particle of an element is?
B. Atom
2. The smallest particle of matter is?
B.Atom
Explanation:
An atom is the basic building block of chemistry. It is the smallest unit into which matter can be divided without the release of electrically charged particles. It also is the smallest unit of matter that has the characteristic properties of a chemical element.
Rayon was one of the first manufactured fibers. It was made by treating and "regenerating" which material?
a)Cellulose
b)Clay
c)Ionic polymers
d)Plastic
What is the boiling point of a solution of ethanol (C2H5OH) and sugar (C12H22O11) that contains 20.00 g of the sugar in 250.0 g of the ethanol
The boiling point elevation is a colligative property. From the calculations, the boiling point of the ethanol - sugar solution is 78.65°C.
What are colligative properties?The term colligative properties refers to those properties that depend on the number of solute particles present.
Number of moles of sugar = 20 g/342.3 g/mol = 0.058 moles
Boiling constant of ethanol = 1.22 °C⋅kg/mol
Molality of the solution = 0.058 moles/250 * 10^-3 = 0.232 m
Since sugar is a molecular substance, the Van't Hoff factor is 1
The normal boiling point of pure ethanol is 78.37 °C
ΔT = K m i
ΔT = 1.22 °C⋅kg/mol * 0.232 m * 1
ΔT = 0.28°C
Boiling point of solution = 78.37 °C + 0.28°C = 78.65°C
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Explain the difference between emission and absorption spectra.
The major distinction between emission and absorption spectra is that an emission spectrum has various colored lines, whereas an absorption spectrum contains dark-colored lines. When electrons return to their original energy levels, this is called emission. When electrons absorb energy, they leap to higher energy levels. When ground-state atoms absorb energy from a radiation source, atomic absorption spectra are created. When neutral atoms in an excited state return to the ground state or a lower-energy state, they release energy, resulting in atomic emission spectra.
Match the scientist with their achievement:
Answer:
Frederich Miescher- first person to isolate DNA and RNA
Frederick Griffith- first to demonstrate horizontal transmission of dna using bacteria
Gregor Mendel- documented and demonstrated inheritance patterns
Thomas Hunt Morgan- identified chromosomes as the structures responsible for inheritance
Joachim Hammerling- demonstrated that the hereditary information of of eukaryotes is contained within the nucleus
Alfred Hershey and Martha Chase- demonstrated that dna not protein was the molecule responsible for hereditary
George Beadle and Edward Tatum- used mutants to show the relationship between DNA and proteins
Albrecht Kossel- characterized the structure of adenine, guanine, cytosine, thymine, and uracil
Explanation:
Hope this helps! Pls give brainliest!
Match the scientist with their achievement:
Albrecht Kossel: Characterized the structure of adenine, guanine, cytosine, thymine, and uracilFriedrich Miescher: First person to isolate DNA and RNAGregor Mendel: Documented and demonstrated inheritance patternsThomas Hunt Morgan: Used mutants to show the relationship between DNA and proteinsJoachim Hammerling: Demonstrated that the hereditary information of eukaryotes is contained within the nucleusGeorge Beadle and Edward Tatum: Demonstrated that DNA, not protein, was the molecule responsible for heredityFrederick Griffith: First to demonstrate horizontal transmission of DNA using bacteriaAlfred Hershey and Martha Chase: Identified chromosomes as the structures responsible for inheritanceLean more about Scientist, here:
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Is it illegal to purchase chloroform in the United States? If so why?
Answer:
no
Explanation:
no its not legal to purchase it
The Young's modulus values for iron and lead are 210 GPa and 16 GPa, respectively. Based on the information, which statement is true for the two
metals?
A. Lead is more ductile than iron.
B. Iron is more ductile than lead.
C. Iron is softer than lead.
D. Lead is a better conductor than iron.
Lead is more ductile than iron. The correct option is A. Lead is more ductile than iron
Young's modulusFrom the question, we are to determine the statement which is true
First, we will define the term Young's modulus
Young's modulus is a measure of the stiffness of an elastic material. It is also given as the ratio of stress to strain. That is,
[tex]Young's\ modulus = \frac{Tensile\ stress}{Tensile\ strain}[/tex]
The greater the modulus, the stiffer the material.
Materials with low Young's modulus tend to be ductile and materials with high Young's modulus tend to be brittle
Since the Young's modulus value for iron is higher than that of lead, then iron is stiffer than lead.
Thus, lead is more ductile than iron. The correct option is A. Lead is more ductile than iron
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Which of the following statements correctly explains why we experience seasons?
(13 Points)
A. As the Earth moves away from the Sun, we change from summer to fall to winter. As the Earth moves closer to the Sun, we change from winter to spring to summer.
B. As the Earth spins on its axis, we experience seasons. Each 1/4 spin of the Earth on its axis represents a change in season.
C. Earth's tilt on its axis means one hemisphere leans toward the Sun, causing it to experience warmer temperatures. As Earth revolves around the Sun, a different hemisphere leans toward the Sun, causes warmer temperatures in that hemisphere.
D. The Moon moving in front of the Sun causes temperatures on Earth to drop, which causes winter. When it moves behind the Sun, a rise in temperature causes summer.
Determine the molarity for a solution of 29.2 g of NaCl is dissolved into 0.50 L of water. Convert the grams to moles using molar mass of NaCl = 58.45 g/mol.
Answer:
etermine the molarity for a solution of 29.2 g of NaCl is dissolved into 0.50 L of water ... - did not match any news results.
Explanation:
Which element would most likely bond with potassium (K)? carbon (C) oxygen (O) sodium (Na) argon (Ar)
Answer:
(O)oxygen
Explanation:
hope it helps
Name the chemical used in fire extinguisher
The most common chemical is Sodium Bicarbonate used in the fire extinguisher, But today, Potassium Bicarbonate is widely used in fire extinguishers due to its effectiveness as compared to Sodium Bicarbonate.
Aluminum carbide powder decomposes in water:
Al4C3 (s) + 12 H2O (l) → 4 Al(OH)3 (aq) + 3 CH4 (g)
Which of the following pairs of quantities represent the correct stoichiometric amounts for this reaction?
a.
1 mol Al4C3 and 1 mol H2O
b.
4 mol Al4C3 and 24 mol H2O
c.
7.2 g Al4C3 and 1.8 g H2O
d.
1 moles Al4C3 and 12 moles H2O
Answer:
d. 1 mole Al₄C₃ and 12 moles H₂O
Explanation:
The coefficients in a balanced chemical equation indicate the number of moles of reactants and products. If a substance does not have a coefficient written in front of it, it is assumed to be 1.
1. Calculate the mass of oxygen required to react with 10.0 grams of iron. 4Fe + 302 → 2Fe20;3
Answer:
2.14g of oxygen
Explanation:
10g x 1mol/55.85mol x 3mol (o)/ 4mol (Fe) x 16g = 2.14g
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Terylene is a popular form of
A. Polyester
B. Monomer
C. Plastic
D. Nylon
Answer:
Polyester
Explanation:
Terylene is popular form of polyesterIt is made by the mixing ethylene glycol and terephthalic acid with the elimination of waterWhat causes water to form on glass?
Answer & Explanation:
Glass Condensation
Heat is transmitted from the hot air to the cold glass when it comes into contact with the cold glass. The water vapor near the glass loses energy due to the loss of heat in the surrounding air. Water vapor condenses into liquid on the glass as energy is lost.