The positive Biuret test indicates the presence of Peptide bond in proteins.
How to do Biuret test for proteins?
Follow these simple steps if you want to know practically:
Step 1: Take a 3 clean and dry test tubes.
Step 2: Add 1/2 ml of test solution to one test tube, albumin for another, and distilled water to third test tube.
Step 3: Add 3-4 drops of Biuret reagent to each test tube.
Step 4: Shake wee and let it be for 4-5 minutes.
Step 5: Observe the colour changes.
Peptide bonds are (C - N ) bonds present in proteins. The Biuret reagent colour is Pale blue and when you test for protein, if the solution contain protein, when you add the Biuret reagent it will turns to Purple. If there is no protein then the colour remains same.
The Biuret reagent is made up of Hydrated copper sulfate, sodium hydroxide, and Rochelle salt (sodium-potassium tartrate).
Peptide bond is also referred to as Amide bonds, it is formed between the Nitrogen atom of one amino acid and the Carbonyl carbon of second amino acid.
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The value of gravitational acceleration of a body on earth is 9.8 meters/second 2 power. The gravitational energy for a 1.00 kg object is found to be 12.5 joules. How high is the ground level, where KE = 0
Answer:
I don't know what the hell is going on with the this.
How do chemical reactions differ from nuclear reactions? (2 points) Chemical reactions involve electrons and protons, and nuclear reactions only involve protons. Chemical reactions involve changes in bonding, and nuclear reactions involve changes in an atom's nucleus. Chemical reactions involve forming bonds, and nuclear reactions involve breaking bonds. Chemical reactions involve sharing of electrons, and nuclear reactions involve the formation of ions.
Nuclear reactions include a change in the nucleus of an atom, which typically results in the production of a new element. Contrarily, chemical reactions only require the rearrangement of electrons and do not affect the nuclei; rather, they entail changes in bonding.
What is a nuclear reaction & a chemical reaction?
Nuclear fission or fusion processes were necessary for the synthesis of elements (decay). Atomic atoms' nuclei are the site of nuclear reactions, as the name suggests.Outside the atom's nucleus, in the electron cloud, chemical processes take to occur. The electromagnetic force is present during chemical processes. An atom's s and p subshells are where most chemical reactions take place. Valence electrons are those located in the outermost s and p subshells.Most of the operations we are acquainted with are powered by chemical reactions, including food digestion, and the conversion of carbohydrates into energy. Chemical processes lack the energy of nuclear reactions. In the atomic core, protons and neutrons participate in nuclear processes. Electrons orbit the nucleus during chemical reactions.Therefore it is concluded that option (B) is correct.
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Consider the following reaction at 298 K.
Which of the following statements are correct?
From the calculation, the correct statements are;
n = 2 mol of electronsK < 1What are the true statements?Now we know that it is possible to obtain the equilibrium constant from the relation;
E°cell = 0.0592/n log K
E°cell = cell potential = -0.403 - 0.535 = -0.938 V
n = number of electrons = 2 electrons
K = equilibrium constant
Thus;
-0.938 = 0.0592/2 logK
-0.938 * 2/ 0.0592 = log K
K = 2 * 10^-31
ΔG = - nFE°cell
ΔG = - (2 * 96500 * -0.938)
ΔG = 181kJ/mol
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Question 6(Multiple Choice Worth 5 points)
(08.01 LC)
Which of the following is a property of water?
It can freeze very fast.
OIt has low heat capacity.
It exists in all three states on Earth.
It repels other water molecules.
The property of water is that It exists in all three states on Earth.
The major residences to be able to be mentioned in this text are its appeal to polar molecules, its high specific warmth, the excessive warmness of vaporization, the decrease density of ice, and its high polarity.
The primary homes of water are its polarity, concord, adhesion, floor anxiety, excessive unique warmth, and evaporative cooling. A water molecule is barely charged on each ends. this is because oxygen is more electronegative than hydrogen.
Water is good sized functionality to dissolve a ramification of molecules has earned it the designation of “standard solvent,” and it's far this capacity that makes water such an invaluable life-sustaining pressure. On a biological level, water's role as a solvent facilitates cells transport and use substances like oxygen or vitamins.
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Kendra knew from science class that water freezes at 0°C. She started to wonder
about the freezing points of other clear liquids. She decided to conduct an
experiment using vinegar, rubbing alcohol, and bleach. She pours 50 mL of each
liquid into three plastic containers that are all the same. She puts them in the freezer
at the same time and places the same brand thermometer in each liquid. Kendra
checks the temperatures every ten minutes and records her observations in her
journal.
Independent Variable:
Dependent Variable:
Three Control Variables:
YesYes , the water freezes at 0°C and every substance has it's own freezing points.
What is Freezing point ?The temperature at which a liquid solidify.The temperature at which the liquid and solid substance are in equilibrium at atmospheric pressure: melting point of water is 0°Celsius or 32°Farenhiet.
The freezing point of alcohol will be -114°C .
The freezing point of Bleach will be 19°F .
The Freezing point of vinegar will be 28°F .
The freezing point of rubbing alcohol will be- 100°C .
So,every substance has it's own freezing point.
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How many neutrons does an atom of Uranium 240?
Group of answer choices
A. 148
B. 146
C. 92
D. 240
Answer:
Number of neutrons is equal to 148.
For which of the following reactions is S° > 0.
Choose all that apply.
2C2H6(g) + 7O2(g) ----> 4CO2(g) + 6H2O(g)
2CO2(g) + N2(g) ---->2CO(g) + 2NO(g)
2N2(g) + O2(g) -----> 2N2O(g)
S(s,rhombic) + 2CO(g) ----> SO2(g) + 2C(s,graphite)
NH4Cl(s) ----> NH3(g) + HCl(g)
The entropy of the given reactions increases (S° > 0):
2C2H6(g) + 7O2(g) ----> 4CO2(g) + 6H2O(g) ---> S° > 0.NH4Cl(s) ----> NH3(g) + HCl(g) ---> S° > 0.What is entropy?
Entropy measure how disordered a system is. It a measure of how dispersed or random the total energy of a system is. The symbol for entropy is S.
A system in which entropy increases is one in which S° > 0.
The entropy of a system decreases when S° < 0.
Entropy of a system increases (S° > 0) if any change results in an increase in temperature, increase in number of molecules, or an increase in volume.
Considering the given systems, the entropy changes is as follows:
2C2H6(g) + 7O2(g) ----> 4CO2(g) + 6H2O(g) ---> S° > 0.2CO2(g) + N2(g) ---->2CO(g) + 2NO(g) --> no change2N2(g) + O2(g) -----> 2N2O(g) ---> decreasesS (s,rhombic) + 2CO(g) ----> SO2(g) + 2C (s,graphite) ---> no changeNH4Cl(s) ----> NH3(g) + HCl(g) ---> S° > 0.In conclusion, an increase in volume and moles of substances results in entropy increase.
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Calculate the volume in litres (L) of 1.41 mol of gas at 68.0 kPa and 27.00 °C (gas constant R = 8.314 J mol K-.).
1. 664 L
2. 0.384L
3. 51.7L
4. 4.66L
5. 0.511L
Answer:
3.) 51.7 L
Explanation:
To find the volume, you need to use the Ideal Gas Law:
PV = nRT
In the equation,
-----> P = pressure (kPa)
-----> V = volume (L)
-----> n = moles
-----> R = Ideal Gas constant (8.314 kPa*L/mol*K)
-----> T = temperature (K)
First, you need to convert the temperature from Celsius to Kelvin. Then, you can plug the given values into the equation and simplify to find "V".
P = 68.0 kPa R = 8.314 kPa*L/mol*K
V = ? L T = 27.00 °C + 273 = 300 K
n = 1.41 moles
PV = nRT <----- Ideal Gas Law
(68.0 kPa)V = (1.41 moles)(8.314 kPa*L/mol*K)(300 K) <----- Insert values
(68.0 kPa)V = 3516.822 <----- Multiply right side
V = 51.7 <----- Divide both sides by 68.0
how do scientists believe that chloroplasts got into photosynthetic cells?
The development of chloroplast is thought to occur through endosymbiosis.
According to the endosymbiosis, some of the organelles found in modern eukaryotic cells, such as mitochondria and chloroplasts, were previously prokaryotic microorganisms. A non-photosynthetic creature acquired one photosynthetic cell, and the chloroplast was subsequently created.
An organelle known as a chloroplast is crucial to the process of photosynthesis in plants. It contains pigments like chlorophyll and other pigments that are in charge of capturing sunlight. Since each chloroplast has two membranes, other organelles such as mitochondria are referred to as double-membrane organelles. It is believed that cyanobacterial endosymbiosis played a role in the genesis of the chloroplast. Prokaryotic organisms like cyanobacteria have the capacity to prepare their food through the process of photosynthesis.
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Answer:what’s the answerr
Explanation:
The empirical formula for a compound is C3H3O its molecular mass 110 what is its molecular formula
Answer:
C6H6O2
Explanation:
Total mass of empirical =55
Total mass of compound is 110. So you need to multiply each atims by 2
A syringe containing 2.56 mL of He gas at 75.2 degrees Celsius is cooled to 18.2 degrees Celsius. What is the final volume of the gas?
Answer:
v = 2.141 ml
Explanation:
we can use the "ideal gas law" :-
PV=nRTp :- pressure ( pa )
V :- Volume ( m³ )
n :- amount of substance ( mol )
R :- Ideal gas constant ( 8.314 Jmol-¹ K-¹ )
T :- Temperature ( K)
The isotope sodium-24 has a half-life of 15 hours. Starting with 22 grams, how much remains in 30
hours?
Answer:
5.5 grams
Explanation:
To find how much of the isotope remains, you need to use the half-life equation:
[tex]N(t) = N_0(\frac{1}{2})^\frac{t}{h}[/tex]
In this equation,
-----> N(t) = remaining mass (g)
-----> N₀ = initial mass (g)
-----> t = time (hrs)
-----> h = half-life (hrs)
You can find the remaining mass by plugging the given values into the equation and solving.
N(t) = ? g t = 30 hrs
N₀ = 22 g h = 15 hrs
[tex]N(t) = N_0(\frac{1}{2})^\frac{t}{h}[/tex] <----- Half-life equation
[tex]N(30) = (22)(\frac{1}{2})^\frac{30}{15}[/tex] <----- Insert values
[tex]N(30) = (22)(\frac{1}{2})^2[/tex] <----- Simplify exponent
[tex]N(30) = (22)(0.25)[/tex] <----- Solve [tex](\frac{1}{2} )^2[/tex]
[tex]N(30) = 5.5[/tex] <----- Multiply 22 and 0.25
If a thermometer reads 17° C, what is the temperature in Fahrenheit?
Answer:
62.6
Explanation:
formula = (°C x 9/5) + 32
(17°C x 9/5) + 32
30.6 + 32
62.6
How many grams of Nitrogen gas are found in 22.4 L of Nitrogen gas?
Group of answer choices
A. 20 g
B. 14 g
C. 56 g
D. 28 g
Answer:
The answer is 28 gram.
28 gram of Nitrogen gas are found in 22.4 l in Nitrogen gas
Find the amount of heat energy needed to convert 150 grams of ice at -15°C to ice at -63°C.
Group of answer choices
A. (-) 14760 Joules because the ice is being heated.
B. (-) 14760 Joules because the ice is cooling.
C. 14760 Joules because the ice is cooling.
D. 14760 Joules because the ice is being heated.
The heat needed is (-) 14760 Joules because the ice is cooling.
What is heat?The term heat refers to a form of energy that can be observed as a result of temperature difference between two bodies. We can recall that heat always flows from the hotter to the cooler body.
Given that the heat added to a substance can be calculated by the use of H = mcdT
Where;
H = heat
m = mass
c = specific heat capacity
T = temperature change
Hence;
H = 150 g * 2.03 Jg∘C * (-63 - (-15))
H = (-) 14760 J
Hence the heat needed is (-) 14760 Joules because the ice is cooling.
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What is the
molality of 30g of NACI dissolved in 350g of water
Answer:
1.45 mol/kg
Explanation:
nilered videos
Answer:
1.47 m
Explanation:
The molality can be found using the following equation:
Molality = moles solute / mass (kg) solvent
In this case, NaCl is the solute and H₂O is the solvent. To find the molality, you need to (1) convert grams NaCl to moles (via the molar mass), then (2) convert grams H₂O to kilograms, and then (3) calculate the molality.
(Step 1)
Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol
Molar Mass (NaCl): 58.443 g/mol
30 grams NaCl 1 mole
-------------------------- x ------------------------ = 0.513 moles NaCl
58.443 grams
(Step 2)
1,000 grams = 1 kg
350 grams H₂O 1 kg
-------------------------- x ----------------------- = 0.35 kg H₂O
1,000 grams
(Step 3)
Molality = moles solute / mass (kg) solvent
Molality = 0.513 moles NaCl / 0.35 kg H₂O
Molality = 1.47 m
In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. Which postulate of kinetic molecular theory best explains how this is possible? (3 points)
Attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly.
Collisions between gas particles are elastic; there is no net gain or loss of kinetic energy.
Gases consist of a large number of small particles, with a lot of space between the particles.
Gas particles are in constant, random motion, and higher kinetic energy means faster movement.
Collisions between gas particles are elastic; there is no net gain or loss of kinetic energy this postulate of Kinetic Molecular Theory best explain that how this is possible.
Hence, Option B is correct answer.
What is Kinetic Molecular Theory ?The Kinetic Molecular Theory or KMT states that gases are composed of a large number of particles. In these particles are much smaller than the distance between particles. No attraction or repulsion between these particles.
What are the Postulates of Kinetic Molecular Theory ?The postulates of kinetic theory of gases are:
Collision are perfectly elastic. No energy is lost or gained from collision. There is no change in energy of either the particles or the wall upon collision. The lighter gas molecules moves fast as compared to heavier molecules.Collisions between gas particles or collisions with the vessel walls are perfectly elastic. None of the energy of a gas particle is lost when it collides with another particle or with the walls of the vessel.
Thus from the above conclusion we can say that Collisions between gas particles are elastic; there is no net gain or loss of kinetic energy this postulate of Kinetic Molecular Theory best explain that how this is possible.
Hence, Option B is correct answer.
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I need help I feel like it might be wrong thanks
Answer:
No it's correct.
Explanation:
The water temperature is 25 degrees Celsius. it's rigHT.
How many ml of 3M NaOH would it take to neutralize 120ml of 1M HCL?
Answer:
30ml
Explanation:
the acid-base solution just begins to turn pink and the pH reaches 7, indicating that the base has neutralized the acid. By reading the buret, it is found that 30 ml of NaOH was needed to neutralize the HCl.
If you rub a magnet over a metal screw driver, you can magnetize the screw driver. This is because the magnet
The magnet can cause the alignment of electron domains in the metal screw driver on rubbing, causing magnetism.
The magnetism in a permanent magnet is produced by magnetic moments of electrons in the magnet's constituent material. The material's atoms are each like tiny magnet bars. As a result of the quantum mechanical effect, the majority of these tiny magnets now prefer to align in a single direction to form domains, consequently magnetizing the entire substance.
Electrons exist in magnetic metals as well, although they are arranged differently. A strong magnet has a magnetic field strong enough to cause residual magnetism in the metal screwdriver by aligning the domains in it on rubbing with the metal.
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Carbonyl chloride, also called phosgene, was used in World War 1 as a poisonous gas. The equilibrium concentrations for the reaction between carbon dioxide and molecular chlorine to form carbonyl chloride
CO(g) + Cl2(g) <--> CoCl2(g)
are [CO] = 1.2 x 10-2 M, [Cl2] = 0.054 M, and [CoCl2] = 0.14 M. Calculate the equilibrium constant (K).
Group of answer choices
A. K = 4.63 x 10-3
B. K = 216
C. K = 2.56
D. K = 6.23 x 102
From the calculations, the equilibrium constant is 216. Option B
What is the equilibrium constant?The equilibrium constant can depict the amount of reactants that is converted into products at a given time. We know that if thus number is large and positive, then it means that the reaction would proceed to the right.
Thus, we have the equation of the reaction as; CO(g) + Cl2(g) <--> CoCl2(g) and we know that;
K = [CoCl2]/ [CO] [Cl2]
[CoCl2] = concentration of CoCl2
[CO] = concentration of CO
[Cl2] concentration of Cl2
Substituting the values into the equation;
K = 0.14/ 1.2 x 10-2 * 0.054
K = 216
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How many moles of Hydrogen gas will be produced if you start with 2.5 moles of Magnesium and an excess of Hydrochloric Acid given the following balanced chemical reaction:
Mg + 2HCl → MgCl2 + H2
Group of answer choices
A. 1.25 moles
B. 5.0 Moles
C. 7.5 moles
D. 2.5 moles
Taking into account the reaction stoichiometry, 1.25 grams of H₂ (option A) are formed if you start with 2.5 moles of Magnesium and an excess of Hydrochloric Acid.
Reaction stoichiometryIn first place, the balanced reaction is:
Mg + 2 HCl → MgCl₂ + H₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Mg: 1 mole HCl: 2 molesMgCl₂: 1 moleH₂: 1 moleMass of hydrogen formedThe following rule of three can be applied: if by reaction stoichiometry 2 moles of Mg form 1 mole of H₂, 2.5 moles of Mg form how many moles of H₂?
[tex]moles of H_{2} =\frac{2.5 moles of Mgx1 mole of H_{2} }{2 moles of Mg}[/tex]
moles of H₂= 1.25 moles
Finally, 1.25 grams of H₂ (option A) are formed if you start with 2.5 moles of Magnesium and an excess of Hydrochloric Acid.
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Solve the following question
Answer:
140. J/g*K
Explanation:
To find the specific heat capacity, you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = energy/heat (J)
-----> m = mass (g)
-----> c = specific heat (J/mole*K)
-----> ΔT = change in temperature (K)
Before you can use the equation above, you need to (1) convert kg to grams, then (2) convert grams to moles (via molar mass), and then (3) convert Celsius to Kelvin. The final answer should have 3 significant figures.
1.11 kg C₄H₈O₂ x 1,000 = 1110 g
Molar Mass (C₄H₈O₂): 4(12.01 g/mol) + 8(1.008 g/mol) + 2(16.00 g/mol)
Molar Mass (C₄H₈O₂): 88.104 g/mol
1110 grams C₄H₈O₂ 1 mole
------------------------------ x ------------------------- = 12.6 moles C₄H₈O₂
88.104 grams
34.5 °C + 273 = 307.5 K
52.3 °C + 273 = 325.3 K
Q = mcΔT <----- Equation
3.14 x 10⁴ J = (12.6 moles)c(325.3 K - 307.5 K) <----- Insert values
3.14 x 10⁴ J = (12.6 moles)c(17.8) <----- Subtract
3.14 x 10⁴ J = (224.28)c <----- Multiply 12.6 and 17.8
140. = c <----- Divide both sides by 224.28
**this answer may be slightly off due to using different molar masses/Kelvin conversions**
Determine which elements or compounds are reactants in the following equation calcium + chlorine = calcium chloride
Answer:
See below
Explanation:
Calcium and chlorine are the reactants ..... they 'react' in a chemical reaction to form the compound calcium chloride .
Which is always going to be the highest ionization energy?
Group of answer choices
A. 2nd Ionization Energy
B. 1st Ionization energy
C. All Ionization energies are equal.
D. 3rd Ionization Energy
Answer: I think it's B.
Explanation:
The second ionization energy is always the highest ionization energy. Ionization energy is the energy required to remove an electron from an atom in its gaseous state. Hence the correct option is A.
The first ionization energy is the energy required to remove the first electron from an atom. The second ionization energy is the energy required to remove the second electron from an atom that has already lost one electron.
The first ionization energy is always lower than the second ionization energy because the first electron is easier to remove because it is not as strongly attracted to the nucleus.
Once one electron has been removed, the remaining electrons are more strongly attracted to the nucleus, making it more difficult to remove the second electron.
Therefore, option A) 2nd Ionization Energy is correct.
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How many grams of NaOH are needed to make a 250.0 mL or a 4.2 M NaOH solution?
Group of answer choices
A. 1.05 grams NaOH
B. 42,000 grams NaOH
C. 42 grams NaOH
D. 1050 grams NaOH
42 grams of NaOH are needed to make a 250.0 mL or a 4.2 M NaOH solution (option C).
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles by its molar mass.
However, the number of moles of NaOH can be calculated using the following formula;
Molarity = no of moles ÷ volume
no of moles = 0.250L × 4.2 = 1.05mol
Hence, the mass of NaOH can be calculated as follows:
mass = 1.05 mol × 40g/mol = 42g
Therefore, 42 grams of NaOH are needed to make a 250.0 mL or a 4.2 M NaOH solution.
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State whether the following liquids are miscible with hexane (C6H14) by entering "yes" or "no".
Benzene, C6H6
iron (IIl) nitrate, Fe(NO3)3
Sulfuric acid, H2SO4
Benzene, C6H6 is miscible with hexane (C6H14) but iron (IIl) nitrate, and Sulfuric acid, H2SO4Fe(NO3)3 are not miscible with hexane (C6H14)
Since organic or non polar dissolves in nom polar solvent.here both benzene and hexane (C6H14) are non polar solvents.But iron (IIl) nitrate, Fe(NO3)3 and Sulfuric acid, H2SO4 are inorganic and polar, therefore cannot dissolve with non polar solvent like hexane.
Miscible is a flowery heard that oil and water aren't very miscible substances, while seltzer and orange juice are miscible and scrumptious.Miscible beverages are also described as liquids that can blend to form a homogeneous solution. Miscible drinks generally blend with out limit, meaning they may be soluble at all quantities.
Miscible approach the materials blend completely. If substances are miscible, they're also absolutely soluble in each other no matter the order of creation. for example, tetrahydrofuran and water are miscible.
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Which of the following ionic formulas is INCORRECT?
a) K₂O
b) Fe₂(SO4)_3
c) CUPO4
d) (NH4)_2S
e) CaBr₂
Answer:
c) CuPO₄
Explanation:
Copper commonly forms the cation Cu²⁺.
Phosphate is a polyatomic anion which can be represented by PO₄³⁻.
In order to have proper charge balance (an overall charge of 0), there must be three copper cations and two phosphate anions within the compound. As such, the correct ionic formula is Cu₃(PO₄)₂.
1)Determine the hydroxide concentration in a 0.5M of hydrochloric acid? 0.5M of potassium hydroxide.
2)What is the hydroxide ion concentration of a solution if the pH is 5.36?
3)what is the concentration of a hydrochloric acid solution if 3.5mL are needed to neutralize 7.6mL of 0.25M sodium hydroxide?
4) write the bronsted- Lowry reaction between ammonia and sulfuric acid. Label the acid, base, and their conjuagtes.
What are the component of black powder and why are they needed to cause an explosion
Hi There!
Black powder is an explosive powder consisting of saltpeter, sulfur, and charcoal, used chiefly in old guns fired for sport, in fireworks, and for spotting charges in practice bombs; black gunpowder.
In addition to being easily ignited by friction and impact, black powder is also extremely sensitive to flame and spark. It ignites violently when unconstrained and explodes when lit in even the slightest amount of confinement.
Thank you,
Eddie