Nơi chia sẻ tri thức, kết nối cộng đồng và giải đáp mọi thắc mắc từ A–
Nơi chia sẻ tri thức, kết nối cộng đồng và giải đáp mọi thắc mắc từ A–
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Une petite fille vraiment très laide va commander un gâteau à la boulangerie pour l'anniversaire de sa petite sœur. La boulangère, émue par cette petite fille ...
Which is correct, 'many people' or 'many a people'?
Both are correct. The difference is MANY PEOPLE is followed by a PLURAL VERB. MANY A PEOPLE is followed by a SINGULAR VERB. Examples: Many ...Read more
How to solve 1×(5+7)
Anything multiplied by 1 1 remains unchanged. So 1×(5+7) 1 × ( 5 + 7 ) is the same as 5+7=12.Read more
What does it mean when you're seeing a guy and he asks ' ...
If a man is truly interested in a woman, he will directly ask her if she is too interested in him. For example: “I would like to know more about ...Read more
Which is grammatically correct: he asked a question to me ...
Both are incorrect. There are no prepositions needed here; using them is actually wrong. The correct grammatical form is: He asked me a question.Read more
NaNO3 + H2SO4 ➡️ HNO3 + Na2SO4 My chemistry ...
When the mixture of sodium nitrate and concentrated sulfuric acid is warmed under laboratory conditions, vapor of nitric acid is formed.Read more
How to complete the equation Fe+O2→Fe2O3
From the reaction between Fe (III) with O2 in the air as follows : · 4 Fe + 3 O2 → 2 Fe2O3, · it can be stated that 4 mole Fe ~ 3 mole molecular ...Read more
What is the value of tan x cot x?
Since cot(x)=1/tan(x), we get that tan(x)cot(x)=1. Hence, tan(x)cot(x)=1 when both are defined at x and undefined otherwise.Read more
What is the redox titration between KMnO4 acidified with ...
2 FeSO4 + H2SO4=> Fe2(SO4)3 + H2O So here KMnO4 will get reduced to MnSO4. FeSO4, will get oxidised to Fe2(SO4)3. The ionic equation is. MnO4– + ...Read more
Which is correct: “to turn the TV off” or “to turn off the TV”?
Both are correct. If writing for native speakers of English, I would give preference to “turn the TV off” because grammatically that arrangement ...Read more
What is the domain and range of y=1/x?
Assuming you're only dealing with real numbers, the domain is x > 0. The range is y >1.89 . You may wonder where the 1.89 ...Read more
What is the family name(s) of CnH2nO, CnH2nO2, CnH2n ...
CnH2n+2 is the standard formula for alkanes. These are called saturated hydrocarbons. It means all carbon atoms are bonded to the maximum amount ...Read more
'They are a brother and a sister.' Is this grammatically wrong?
If you are trying to say that the two are siblings, that is children of the same parents, then say, “They are brother and sister.”.Read more
If 5x=25, what is x?
You can solve for X by dividing both sides of the equation by 5. That will give you X=25/5. 25/5 is 5, so X=5.
Can I use 'more lazy' instead of lazier?
Therefore, “lazier” is correct and “more lazy” is not.Read more
What will happen if you mix isopropyl alcohol with sodium ...
There is no reaction between isopropyl alcohol and sodium hydroxide. The acidity of aliphatic alcohol is very low and thus aliphatic alcohols ...Read more
Why is'He has been dead' odd but ...
It means he has the experience of being dead but hes not dead any more. For many years qualifies how long he has been dead (and is still dead).Read more
Why don't we use “have been dead” but “have died” in ...
“Have been dead" = it is over and done with, completely finished. “Have died" = recently, and/or with the potential for ...Read more
What is the verb of beauty?
Beautify, which means 'to cause to have beauty.' Adding the adjective suffix -ful, gives us “beautiful,” meaning 'to have beauty.'Read more
What does CnH2n+1, CnH2n-n, Cnh2n, and Cnh2n+2 ...
CnH2n+2 is the standard formula for alkanes. These are called saturated hydrocarbons. It means all carbon atoms are bonded to the maximum amount ...Read more
What is the value of .1^(5/2)? - Quora
Another way is to simplify it to get the value. 0.1^5/2 is equal to = 1 ^5/2 /(10^5/2) = 1/((10^2) + 10^1/2) = 1 / (100 + √10)Read more
What gives when a nitration of toluene is fuming nitric and ...
Since it is an acid, it is a proton donator. The OH- from the HNO3 and H+ from the H2SO4 bond to form water and are removed.Read more
What will be the product if Toluene is reacted with Conc. ...
Conc. HNO3 and conc. H2SO4 is a very harsh mixture used to do nitrations on aromatic compounds, such as benzene. Tolerance of functional groups ...Read more
Is it okay to leave a car for 1 year without driving it?
Yes, if it has been maintained, under severe use or even regular maintenance—with records to prove it. Those miles must have been highway miles ...Read more
How to solve the equation sin2x=cos3x
so x = inverse tangent of unity, which is 45 degrees and (45+180) degrees. Note that we did not deal with limit conditions of x approaching zero ...Read more
Which is grammatically correct, 'there are many' or ' ...
There are many people. While people looks like a singular word, it represents a plural number. Thus, we use there are instead of there is.Read more
Should I say 'there is many” or “there are many”?
You should say “the are many” because “many” is plural and “is” indicate the singular. But you can say “there is one”.Read more
What is the value of x in the equation sin^2(x) - cos^2(x) = 0?
sin^2(x) - cos^2(x) = 0 (given) => sin^2x = cos^2x tan^2x=1 ..... (i) => tanx=±1 => x=tan−1(±1) Now, x=tan−1(1)=nπ+π/4 in general Also, ...
Which is correct, “the children are” or “is”?
"The children are" is correct. "Children" is a plural noun, requiring the plural form of the verb "to be." "Is" is incorrect as it is the ...Read more
What is the difference between CuO and Cu(OH) 2 in terms ...
The CuO is a black solid at room temperature, whereas the copper(II) hydroxide is a pale green/blue coloured solid. Cu(OH)2 is square pyramidal in structure.Read more
How to prove that cos a+cos b+ cos c+cos (a+b+c) =4Cos ...
cos a + cos b + cos c + cos (a+b+c) =2 cos ((a+b)/2) cos ((ab)/2) + 2 cos ((c+a+b+c)/2) cos ((ca-b+c)/2) Read more
What is the product of Nacl+Na2CO3?
Na2CO3 + 2 HCl = 2 NaCl + CO2 + H2O . So molar mass of Na2CO3 is 105.99 g/mole so 204.69 g NaCl= 1.93 mol Na2Co3. So from the equation you get ...Read more
How to write the balanced chemical reaction equation for ...
NaCl + Na2CO3 → 3Na^+ + Cl^- + CO3^-2 Essentially there is no reaction. Sodium chloride dissolves in water as sodium cations and chlorine anions.Read more
What is more basic, Na2SO4 or Na2SO3?
Na2SO3 (sodium sulphite) is more basic than Na2SO4 (sodium sulphate). Na2SO4 is a salt of a strong acid and a strong base, namely sulphuric ...
What is the balanced chemical equation for Fe(OH) 2+O2= ...
The 4 H2O then cancels from each side of the equation to give… (4) 4 Fe(OH)2 + 2 H2O + O2 → 4 Fe(OH)3.Read more
How is the formula P=Po+pgh obtained?
By definition, the pressure at the base of this column is equal to the force F pushing on that base divided by the surface area of the base.Read more
What will happen to MgO if it is added to H2SO4?
Metal salt (sulphate in this case) & water are produced, with the salt remaining in aqueous solutionMgO + H2SO4 → MgSO4 + H2ONot a lot happens ...Read more
What is [math]\cos x + \cos 2x + \cos 3x +\cdots[/math]?
A is the length of the blue segment, and B the length of the red segment. Therefore, A^2 + B^2 = C^2. The phase angle φ is the angle shown in ...Read more
Which is correct, 'last for about 2 years' or 'last for around ...
Both are right in their own places, but not similar in meanings. When you say about two years, there is an uncertainty about the number whether it is a little ...Read more
How much would a house cost in 10 years which is 30 ...
Here's a real rough way to guestimate its value in 10 years: Double its current value. That assumes an appreciation of 7% a year. It could be a lot more.
What is 5 times 9?
9+5 is an expression that means 5 added to 9 (of something or some unit). Assuming one-dimensional domain and the conventional meaning of '+', ...Read more
What is the difference between 'When I arrived, I could see ...
The first sentence uses the past perfect tense, while the second uses the simple past tense. The tone of the first is more learned; that of the ...Read more
What is the value of a 1 atomic mass unit?
The mass of 1u = 1.660539×10−27 kg,. The CIPM has categorised it as a non-SI unit accepted for use with the SI, and whose value in SI units ...Read more
Which one is correct, 'he was tired' or 'he tired'?
He was tired is correct. Tired is the past tense of the word to tire. The word 'was' is needed to hook up and explain the subject 'He' to the ...Read more
How to balance the following reaction where ethanol ...
C2H5OH K2Cr2O7 + H2SO4 =CH3COOH. The oxidative ability of Cr2O7- depends on the pH value of the reaction, the more acid, the more powerful. We ...
Who was the best student that you have ever taught?
I have taught a lot of bright students. They are the ones who realise by taking the opportunity that school gives they can develop themselves ...Read more
What is correct, “parent is” or “parents are”?
Both the terms are correct. “Parent is” is used for one parent and “Parents are” is used for more than one parent. For example, Parent is ...
Which is grammatically correct, parents or parent?
Technically, “parent” means someone's Mother or Father. So, Parent is used to referred to only one of them (mom/dad) while parents is used to ...Read more
What is the total inoic equation of FeCl3 mixed with H2SO4?
There is no reaction between FeCl3 and H2SO4 . Therefore it is not possible to write any equation including a total ionic equation.Read more
Which one is right 'on the world' or 'in the world'?
We say it's “in the world,” meaning in the entire human environment. We would say “on the earth” if we meant on the entire surface of the planet ...Read more
Why are people interested in questions like 'solve: x/4 = 10'?
If it takes 10 boulders to build an arch and we want to build 4 arches then the total number of boulders satisfies your relationship (though of ...Read more
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