For an impure sample of potassium hydrogen phthalate, the percentage of potassium hydrogen phthalate is
m'=39.3%
What is the percentage of potassium hydrogen phthalate if 2.81 g of the mixture required 35.61 mL of 0.152 mol/L NaOH to reach the end point?Generally, the equation for the mol base is mathematically given as
mol base = M*V
mol base = 0.152*35.61
mol base = 5.41272 mmol
In conclusion
mass = mmol/1000*MW
m== 5.41272 /1000*204.22
m= 1.1053 g of KHP
Hence, m'=39.3%
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How does a noncompetitive inhibitor decrease the rate of an enzyme-catalyzed reaction?.
Answer:
In fact, the inhibitor and substrate don't affect one another's binding to the enzyme at all. However, when the inhibitor is bound, the enzyme cannot catalyze its reaction to produce a product. Thus, noncompetitive inhibition acts by reducing the number of functional enzyme molecules that can carry out a reaction.
If you have a closed container that has a pressure of 2.35atm, and a volume of 1.2L, and contains 76.33g Cl2, what is the resulting temperature in K
The resulting temperature of a closed container that has a pressure of 2.35atm, and a volume of 1.2L, and contains 76.33g Cl2 is 31.8K.
How to calculate temperature?The temperature of a given gas can be calculated by using the ideal gas law equation:
PV = nRT
Where;
P = pressure V = volume n = number of molesR = gas law constantT = temperatureno of moles of Cl2 = 76.33g ÷ 70.91g/mol = 1.08mol
2.35 × 1.2 = 1.08 × 0.0821 × T
2.82 = 0.088T
T = 2.82/0.088
T = 31.8K
Therefore, the resulting temperature of a closed container that has a pressure of 2.35atm, and a volume of 1.2L, and contains 76.33g Cl2 is 31.8K.
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An envelope could be a source of DNA evidence.
True
False
Answer:
True
Explanation:
DNA can be extracted from bite marks, cigarette buds, postage stamps on envelopes, and envelope flaps for DNA analysis.
Answer:
false. a envelope is what the DNA evidence goes in
Explanation:
Giving brainiest and 55 points!
Answer:
C
Explanation:
Hot and humid weather, accompanied by thunderstorms, is generally due to maritime tropical air massoriginate in the tropical oceans of both the hemispherescharacterized by high temperatures and are rich in moisture contentair mass during winter moves towards the land areas in the form of wind breeze affecting placesexperiences hot and humid weather during the summer seasonwhich phrase explains the apparent motions of planets in the night sky?
The east to west daily motions of stars, planets, the Moon, and the Sun are caused by the rotation of the Earth on its axis. The Earth and all the planets revolve around the Sun on circular orbits. This produces the change in constellations observed from one time of year to the next.
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What part of defense would likely be affected if the pathogen contained a mutation in it's pathogen-associated molecular patterns (PAMPs)?
the pathogen would secrete greater amounts of toxins...
the pathogen would not be able to penetrate the host's physical barriers.
the pathogen might not be recognized by the host.
the pathogen would be easily recognized by the host's TLRs.
Answer:
The pathogen might not be recodnised by the host :)
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Equation for the hydrolysis of glyceryl triethanoate.
The equation for the hydrolysis of glyceryl triethanoate is C3H5(OH)3 + 3CH3COOH = C3H3(OCOCH3)3 + HOCH2CH(OH)CH2OH
What is Hydrolysis?Hydrolysis is a chemical reaction which water molecule break down one or more chemical bonds. This is use for substitution, elimination, and solubility.
Hydrolysis depend on the pH, solubility and chemical constituent of the substance.
Therefore, The equation for the hydrolysis of glyceryl triethanoate is C3H5(OH)3 + 3CH3COOH = C3H3(OCOCH3)3 + HOCH2CH(OH)CH2OH
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complete and balance the following equation b. na2 co3
the question isnt clear where are the products ir the reactants like __ = ___ + ___
What are the most likely dates of the full moon
Answer:
C
Explanation:
Answer C Full moon occurs approx 2weeks after new moon
help! this is science, Palmas is closer to the equator than Neuquén. Which location has a warmer air temperature and why?
Answer:
Palmas, because more energy is transferred from the sun directly to the surface and then from the surface to the air.
Explanation:
Hope this helps:)....if not then sorry for wasting your time and may God bless you:)
Why do chemist prefer to use kipp’s apparatus for the production of hydrogen sulphide instead of woulf’s bottle??
Chemist prefer to use kipp’s apparatus for the production of hydrogen sulphide instead of woulf’s bottle because they produce gas without generating heat.
What is kipp's appratus & woulf's bottle?Kipp's appratus and woulf's bottle both are the laborartory appratus and used in the analytical process of any reactions.
Hydrogen sulphide gas will be produced in the laborartory by using both given appratus but we prefer the use of kipp's apparatus because in this apparatus small amount of gas is produced in the controlled heat condition by the reaction between the liquid sulphuric acid and solid iron sulphide.
Hence we prefer kipp's appratus as it produces gas without heat.
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Explain in complete sentences why
how the oceans are fundamental to all life on Earth
Answer:
The oceans are the very foundation of human life. life itself arose from the oceans. The oceans are vast, covering about 140 million square miles, some covering 72 percent of the earth's surface.
Explanation:
Solid calcium carbonate reacts with hydrochloric acid, forming aqueous calcium chloride, carbon dioxide
gas, liquid water
help balance
Answer:
When hydrochloric acid comes into contact with calcium carbonate, the following chemical reaction ensues: CaCO3 + 2HCl → CaCl + CO2 + H2O, which provides acid neutralization alongside the formation of byproducts
Answer:
C) liquid
Explanation:
edge 2023
I will mark brainlist
If the colored spheres represent different solute particles, based on the principles of osmosis, in which overall direction is water (not pictured) most likely to move?
A.
Water will move into the cell.
B.
Water will not move into or out of the cell.
C.
Water will move into and out of the cell equally.
D.
Water will move out of the cell.
Water will move into the cell because of lower concentration of water inside the cell as compared to outside.
Why water moves inside or outside of the cell?Water has a tendency to move across a membrane from a lower osmolarity to a higher osmolarity which means from higher concentration region to the lower concentrated region.
So we can conclude that water will move into the cell due to lower concentration of water inside the cell as compared to outside.
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Answer:
If you're from study island, the answer is D. Water will move out of the cell.
Explanation:
I got it on study island and this was right.
Flame __________ __________ is an instrumental method of analysing metal ions in solutions. What are the 2 missing words in this sentence?
Answer:
emission spectroscope
Explanation:
The flame emission spectroscope is a scientific instrument based on flame testing.
Which weather condition is NOT associated with warm fronts??
Answer:
A Winter storm usually does not come with a warm fronthey warm front.
Explanation:
When the front passes over an area it means to change in the weather. Many. Many friends cause weather events such as rain thunderstorms gusty winds tornadoes and hurricanes.
At body temperature, 2404 J is required to evaporate 1 g of water. After vigorous exercise, a person feels chilly because the body is giving up heat to evaporate perspiration. A typical person perspires 25 mL of water after 20 minutes of exercise. How much body heat is used to evaporate this water
Answer: - 1.45 kJ
Explanation:
Using q = m x C x (ΔT)
Given : m = 3.8 g , C = 0.900 J/g°C, = -(450-25)°C = -425°C (Since final temperature is less than the initial, the sign is negative)
q = (3.8 g) x (0.900 J/goC) x ( -425 °C)
= -1453.5 J
= -1.45 kJ
Note that negative sign of q indicates that this much heat is released, when the metal cools down.
Predict: How do you think you could use the Gizmo to make the color gray? _____________
_________________________________________________________________________
Observe: Change the Red, Green, and Blue values to 90. What color does this produce?
_________________________________________________________________________
Grey basically is formed by combining black and white colors together.
In this case, one would have to explore other options.
What kind of colors will form grey?The following color combinations can form grey:
By adjusting the other colors, variations of hue will be observed. It is to be noted that the Gizmo is unaccessible on this platform hence the general answer.
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what challenges arise when nuclear material is removed from a power plant?
Answer:
it destroy the surrounding area
A 4M solution means there are
______ moles of ______
per one _____ of _____.
There are _____ ml within _____ Liter.
Q. How many moles of HCL are within 2,000ml of a 0.4M solution of HCL?
Q. How many grams of KCl are within 2L of a 0.4M KCL solution?
Answer:
Molarity=number of moles÷volume(L)
(Science)
(Quarter 4)
Solve the puzzle game's to have 5 point's
(BEGIN)
( •O•)!?
| |
| |
| |______|________
|________|_____ |
| |
(FINISH)
(real question)
can you know why Sam is nosebleeding
_ ~
(> ㅍuㅍ)>
Explanation:
because of blood pressure
Calculate the concentration of solution containing :
a. 0.2 mole of sodium hydroxide, NaOH, dissolved in water and made up to 100 cm3.
b. 9.8 grams od sulfuric acid, HF, dissolved in water and made up to 500 cm3.
Answer:
the answer for a is 2mol/dm3
Explanation:
n=0.2mol of NaOH
v=100cm3
[tex]v = \frac{100}{1000} \\ v = 0.1 {dm}^{3} \\ concentration = \frac{n}{v} \\ = \frac{0.2}{0.1} \\ = 2mol {dm}^{3} [/tex]
c) Which one of the following compounds will react with perrhenic acid? Tick one box.
ethane
hydrochloric acid
potassium carbonate
sodium chloride
Answer:
I believe is the correct answer
Explanation:
hydrochloric
How does pathogen infection result in the occurrence of fevers in a host?
Edema caused by the pathogen raises the body temperature..
The pathogens break down the host's hypothalmus..
Pyrogens produced by the pathogen alter the host thermostat.
The interaction between PAMPs and PRPs causes a respiratory burst.
Answer:
The answer is Edema caused by the pathogen raises the body temperature. :)
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4Al + 3O2 --> 2Al2O3 coefficients
Answer:
coefficients: 4, 3, 2
Explanation:
Helpppppppppppppppppp
Answer:
Ch4-Methane ( 5 atoms )
CO2- Carbon Dioxide ( 3 atoms )
H2O- Water ( 3 atoms )
2O2- Oxygen ( 2 atoms )
NO LINKS PLEASE! Why does dye dropped into a cup of water eventually spread throughout the water?
A. The water has lattice vectors.
B. The water undergoes a phase transition.
C. The water particles and dye particles exhibit Brownian motion.
D. The water exerts pressure on the container.
Answer:
C
Explanation:
okay, you need to look at the structures of the particles of matter in the solid, liquid and gas.
particles in a solid are in fixed positions, where they can only vibrate in those positions ( take a look at ice, or rather, a brick)liquids have very small or rather, no spaces between them, but they can slide or rub against each other, like people in a really tight crowd I guessgas particles have very large spaces between them and they move randomly. these exibit what's called brownian motion.since water particles (and all other liquid particles) have negligible spacings and limited movement, that allows the dye particles to move from a region of high concentration to that of a low concentration. the aim for this is for the mixture/solution to reach an equilibrium, that is the mixture must get to a point where all regions have the same concentration of the dye.you can refer to your coursebooks :)
correct where wrong please:)
what are the products for the following equation?
NaCl + H2O ->
Answer:
NaOH + HCI
Explanation:
yesssssssssssss
Which term describes the molecule shown below?
H H
C=C
H
H
O A. Saturated alkene
O B. Unsaturated alkane
O C. Unsaturated alkene
O D. Saturated alkane
Answer:
The answer is C
Explanation:
unsaturated hydrocarbons have multiple carbon bonds
Unsaturated alkene describes the molecule shown below as the atoms are attached by double bonds.
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether it is solid,liquid , gas consists of atoms . Each atom has a nucleus which is contains protons and neutrons and shells in which the electrons revolve.
The protons are positively charged particles and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged particles and hence the atom as a whole is neutral particle and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not change the chemical properties of the substances.
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6. Cu + FeSO4
single replacement
Answer:
CuSO4 + Fe
Explanation:
this is because Cu will displace Fe from it's position
