Answer: bạn viết phương trình Phenol + NaOH
=> nNaOH = nPhenol = 0,2 mol
m Phenol = 0,2x94 = 18,8 gam
%mPhenol = 18,8/28,9% = 65,05
Explanation:
It id desired to increase thr volume of gas by 20% without changing the pressure .To what temperature the gas must be heated if the initial temperature of the gas is 27degree celcius?
Answer:
32.4°C
Explanation:
Consider the following expression:
P•V/T =P'•V'/T'
Where P and P' are respectively the initial and the final pressure, V and V's are respectively initial and final volume, and T and T' are respectively initial and final temperature.
We know that the pressure cannot change, so it means that P = P'
We also know that the volume must be increased in 20%, and if we multiply the volume by 1.2 is like increase it in 20%, so we can write that V' = 1.2•V, and changing a little more we can write that V'/V = 1.2
So let's do some maths:
P•V/T = P'•V'/T'
T'•P•V/T = P'•V'
T'•P•V = P'•V'•T
T'=P'•V'•T/P•V
We know that P'=P so the division is equal to 1:
T'= 1•V'•T/V
We also know that V'/V = 1.2, so:
T' = 1.2•T
And we know the value of T, it's 27, so now we just have to solve it:
T' = 1.2•27
T' = 32.4°C
What would you use to measure the height of a sample?
Question 2 options:
ruler
beaker
graduated cylinder
electronic balance
Answer:
please clear ur ques with image
it's unable to be understood
...
Liquids which do not wer the glass surface form a convex meniscus.True or false
Answer:
true is your answer
Explanation:
hope it helps
I need help!!!! please
6.94 is much more closet to 7.016, so Li 7 is more abundant
Select all the correct answers.
Which two properties are characteristic of lonic compounds?
Answer:
1. Ionic compounds have high melting points.
Ionic compounds have high melting points.2 Ionic compounds are hard and brittle.
Ionic compounds have high melting points.2 Ionic compounds are hard and brittle.3 Ionic compounds dissociate into ions when dissolved in water.
What is the oxidation state of fluorine (F)?
The Periodic Table
A.-2
B. +1
C. -1
D. +2
Answer:
It is C. -1
Explanation:
[tex] { \underline{ \sf{ \blue{christ \: † \: alone}}}}[/tex]
Can someone please give me a clear definition of what ceramics are? It will really help! :)
The pots and other articles made from clay hardened by heat is called ceramics..
HOPE IT'S HELPFUL FOR U MATE!!!!
How many pounds of force is 240 Newtons?
Answer:
53.9541 pound force...
can you solve this science question ⁉️
Answer:
chemical reaction between those a b c it's a reaction which occurs when heating
Define atomic number and atomic mass
Answer:
Atomic number ---> number of protons in the nucleus of an atom
Atomic mass ----> the total mass of protons, neutrons, and electrons in an atom
All plants bear flower (true or false)
Answer: Your answer is false.
Explanation
Most of the world's plants are flowering plants called angiosperms (from the Greek words for “vessel” and “seed”), there are hundreds of plants that do not make flowers.
Hope this helps ya! Have a great day! ^-^
aluminum hydroxide molecular weight step by ste
2500m into kilometer
1 meter = 1000 km
2500 meter = 2500/1000 km
= 2.5 km
Which statement describes the VSEPR theory?
A.
Electron pairs in the valence shell of an atom have a tendency to attract other nearby electron pairs.
B.
Electrons in the valence shell of an atom exert a repulsive force on other atoms while forming a chemical bond.
C.
Electron pairs in the valence shell of an atom exert a repulsive force on all other electron pairs in the valence shell of the atom.
D.
Electrons in the valence shell exert a repulsive force while completing their octet during the formation of chemical bond.
Answer:
A.
Electron pairs in the valence shell of an atom have a tendency to attract other nearby electron pairs.
Hope it helps you.Factors that cause pain and illness in household work
Answer:
crucial premise in the study of illness behavior is that illness, as well as the illness experience, are shaped by psychological, social, and cultural factors irrespective of the genetic, physiological, or other biological bases of disease. Hence, as used here, illness and disease are distinct.
Convert 25 yards to inches
using the method of dimensional analysis
Answer:
Explanation:
25 yard [3 feet / 1 yard] [12 inches / 1 foot] = 25 * 3 * 12 = 900 inches in 25 yards.
Always put the unit you are going to on top and the unit you are coming from on the bottom.
So in this example, you want to going to feet to start with. That's on top. Yards are on the bottom of the first bracket. In second bracket feet are on the bottom, inches are what you are going to on the top.
Difference between reactants and products.
Answer:
a reactant is a substance that is at the beginning of a Chemical reaction while a product is a substance that is present at the end of a chemical reaction.in other words a reactant is a substance used up in a chemical reaction to produce something while a reactant is what is produced after a chemical reaction.
I hope this helps
In achemical reaction when two or more substances combine or interact; they are known as reactants.
Products are the substances formed after a chemical reaction.
what is the requirements to obtain citizenship?
please answer it correctly
Answer:
Age. ...
Residency. ...
Residence and Physical Presence.
Good Moral Character.
Attachment to the Constitution.
Language.
U.S. Government and History Knowledge.
Oath of Allegiance.
These are some requirements for obtaining citizenship .
What is the molarity of 2 moles of a compound dissolved in 4 L of water?
A. 2 M
B. 0.5 M
C. 4M
D. 1 M
Answer:
[tex]\boxed {\boxed {\sf B. \ 0.5 \ M}}[/tex]
Explanation:
Molarity is a measure of concentration in moles per liter. The formula for calculating molarity is:
[tex]molarity= \frac{moles \ of \ solute}{ liters \ of \ solution}[/tex]
There are 2 moles of a compound or the solute. There are 4 liters of water or the solution.
moles of solute= 2 mol liters of solution = 4 LSubstitute the values into the formula.
[tex]molarity = \frac{ 2 \ mol}{ 4 \ L}[/tex]
Divide.
[tex]molarity= 0.5 \ mol /L[/tex]
1 mole per liter is equal to 1 Molar, so the solution's molarity of 0.5 mol/L is equal to 0.5 M.
[tex]molarity = 0.5 \ M[/tex]
The molarity of the solution is 0.5 Molar and choice B is correct.
PLEASE HELP!! Which object listed best represents the following energy transformation: electrical -> thermal?
a. flashlight
b. electric saw
c. toaster
d. gas powered scooter
e. the sun
f. wind turbine
g. iPod
h. Stereo Speaker Vibrating
Answer:
The right option is (c) toaster
MAZA11189 can you solve this
Answer:
The answer is below
Explanation:
A) The method of extracting essential oils from aromatic plants is important however, the process of distillation is the main method for extracting the aromatic parts of plants.
B) The condenser fan plays an important role on circulating the air across the coil to facilitate heat transfer. The condenser refrigerant and pumps it to a coil in the form of a hot gas.
which chloride is a coloured solid rtp
Answer:
sodium chloride
hope that helped :)
Answer:
Chlorine is a greenish yellow gas at room temperature and atmospheric pressure. ... yielding chlorine water, and from this solution a solid hydrate of ideal ...
which of the following is not good conductor of heat?
1-brass
2-stainless steel
3-bakelite
4-silver
Answer:
b. stainless steel
Explanation:
b) stainless steel is not good condoctor of heat
HCL is pure covalent compound but soluble in solvent water why
Answer:
HCl is a polar covalent compound, because of electronegativity difference between Cl(3.5) and hydrogen (2). Hence in this way, the bond between HCl breaks and they formed ions in the polar solvent like water .
Does HNO3 conduct electricity?
Answer:
The polar nature of water splits the acid molecules into its cations and anions. Cations and anions are charged particles and are free to move inside the aqueous medium. As a result when a potential difference has applied the solution to conduct electricity.
Explanation:
hope it helps
What are abiotic factors of the ecosystem
Answer:
Abiotic factors are the non-living components of the ecosystem, including its chemical and physical factors.
Hope this helps.
Answer:
Abiotic factors of ecoystem are non-living creatures present on ecosystem.
round to 2 significant numbers, 5239
Answer:
Explanation:
Two sig digits means that 5239 becomes 52 with some zeros behind it. How many?
There were 2 numbers after the 2. So two sig digits would become 5200
If the third digit from the left is a 5 or more then the answer would be
5300.
Which list only includes terms that describe oxygen, gas, and O2?
A. Compound, molecule, pure substance
B. Element, molecule, pure substance
C. Atom, compound, molecule
D. Atom, element, molecule
Oxygen gas O2 is a compound, a molecule and a pure substance.
Oxygen gas is a compound because it contains more than one atom( two oxygen atoms) that are chemically combined together.
Oxygen gas is a molecule because it can exist independently as a unit and the oxygen atoms are covalently bound.
It is a pure substance because it contains only oxygen molecules.
Learn more: https://brainly.com/question/19922822
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PLS HELP URGENT!!!Calculate the area of a floor that is 1.5 × 103 m long and 2.2 × 102 m wide.
