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By Anne Marie Helmenstine, Ph.D., About.com GuideJuly 9, 2004
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how many grams of Na&Cl do I need to make 28 grams of NaCl?
Na: about 11gram
Cl : about 17 gram
na=11 and cl=17 will make 28 grams of nacl
nice questions,are u a chemistry teacher???
how does the presents of impurities affect the boiling point of a liquid
you have to specify which impurities. But in general impurities increase boiling point and lower freezing point.But then, it depends on the impurity
it elevates the Boiling point of the substances
what elevates at boiling point?
IMPURITIES WOULD ALWAYS INCREASE THE BOILING POINT OF A LIQUID. THIS IS BECAUSE MORE NON-LATENT IS GOING TO BE ABSORBED BY THE IMPURITY AND THUS, THE TEMPERATURE [BOILING POINT WOULD BE INCREASED.
when non volatile substance dissolved in solvent the boiling point of solution is increased due to colligative property.
when there are impurities in a liquid it increases the boiling point
171 gm of cane sugar is dissolved in 1litre of water. what is the molarity of solution
the molarity of 171 gm sugal solution in one litre is m/2
how can i determine the concentration and purity of an oxalic acid sample?
can you demonstrate the presence of some of the elements like carbon, hydrogen and other elements such as oxygen, nitrogen, halogens, sufur and phosphorous in a few organic compound and the type of chemical bonds present.
by using IR spectra one can identify the functional groups present in the compound and using H NMR and C NMR one can suggest the hydrogen and carbon framework
from where we get mercury
Complete this sentence: The molecules of different samples of an ideal gas have the same average kinetic energies, at the same ________.
the same temperature
u must lean how to tackle chemistry
temperature and pressure
Properties of metals
Does mixing synthetic oil and pure oxygen present the same spontaneous combustion danger as does hydrocarbon based oils and pure oxygen?
What is the relationship between redox potential and pH? Why would a disulfide be reduced with increase pH?
Use delta H degrees and Delta S degrees to find Delta H and Delta S for S(s)+O2 (g) —-> SO2(g) and use delta H and Delta S to find delta G at 25 degrees celcius>?
i want to make a gas sensor for co2 based on electrochemistry. So i want to know that how can we genrate potential difference with co2? like by dessolving it in to a liquid and then measure the potential difference and how will i measure the potential difference?? please give me a reply as soon as possible.
i do not understand what is chemical equation
name given to a particular equation
That is a very intersting question. Is it rhetorical?
what happen when we add sulphuric acid in water and water in sulphuric acid?
u can add sulphuric acid to water,but cannot add water to sulphuric acid to avoid chemical problem
acid is added to water not water to acid to avoid acid bath because acid splash occur when water is added to acid instead of the reverse
u can not add water into H2SO4 because it has great affinity for water .thus water will turn to gas ……………
we have to add sulfuric acid to water as water to sulfuric acid is a exothermic reaction and it will produce energy.
what the number of molecules in 6.3g of sulphurdioxide gas
the acid splashes when water is added which is dangerous. as a chemist you add acid to water not water to acid.
i thought these questions were rather awsome for my project
whats my name
Carol……..or maybe something else
such an idiot to post questions like this
What is a fossil fuel?
Why are people such idiots? They came to this site obviously for answers to their questions- ligitament questions, yet they ask stupid nonsense like, “What’s my name?”. What on Earth kind of question is that?! People who try to post idiotic crap on an ANSWERS website should be denied access to this site and any others all together.
yeah thats right…
thats hw u know people dat are not ready to learn
why Raderford select a gold sheet for exam not other metals?
because gold is hard and solid element than other elements
if acid is water soluable after doing hydrolyasis reaction of an ester. and during the workup in the acidifiaction , if acid is water soluable then how to recover the pure acid which will be free from the sodium chloride.
When electrolysis of aqueous NaCl is done,why the hydrogen is evolved at cathode instead of sodium(Na)?
hydrogen is evolved at the cathode because it will discharge in prefrence of sodium due to there position in the electrochemical series
Is Aspirin considered from Acids class or from Esters ?!
thx in advance … =]
from acid class
udoka is boy who likes chemistry, but dont know it, but have interest in it. how can i lean it. please help me.
Always think that you can do it……dont have a positive thought
I am sry… i meant 2 say negative thought…..rly rly sry
what is an action unit?
What is the trend across the Period Of ionistaion Energy ????
Explain Your Answer .. !!
what reaction do peroxides have with esters?
how can i fusion talc stone ? ” magnesium silicate ?
(a)Why do we classify elements?
(b)What were the two criteria used by Mendeleev in creating his Periodic Table?
(c)Why did Mendeleev leave some gaps in his Periodic Table?
(d)In Mendeleev’s leave Periodic Table, why was there no mention of Noble gases like Helium, Neon and Argon?
(e)Would you place the two isotopes of chlorine, Cl-35 and Cl-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer
how we prepare alcohol from carbondioxide?
please reply me as soon as possible.Thanks
why conjugate acid is stronger than weak acid?
See miss gave us puzzles on Using different solvents and i got a puzzle like this
nrshvai,rufit cejui,abll nipot kin,tehsm,rcth rooil nehtae, iwhet iistrp and otan cee so if u found it plzzzz……. tell me the answer it’s urgent I nee
d to get the answers by tommorow
What is the difference between the product of carbon-12 reacted with chlorine and carbon-14 reacted with chlorine?
Preparation of aluminium chloride
A soluble chloride x react with a liquid y on heating to give gas z which turns moist litmus paper red and fumed in moist ,identify y and z,give 1 chemical test 2 confirm dat x is a chloride.Its urgent please i need the answer b4 2morrow my ……….thanks
i wonder what would happen if you mix up chemicals all together….????????
it is dangerous to mix chemicals eg do nt add water to acid it can expose
what is the chemical structure of solution of denige???
Why doesn’t water denature proteins?
Protein denaturation by ethanol is explained by the formation of hydrogen bonds between the ethanol and certain aminoacids which breaks those formed between two aminoacids so why isn’t the same possible for water?
(I even considered the hydrophobicity of proteins…proteins are hydrophobic because they are -mostly- apolar and water is polar…..but the same can be said about ethanol…it is polar -less than water but still polar-)
What is the colour of the solution around the cathode,during the electrolysis of a mixture of Sulfuric acid and universal indicator?
should be bluish
why during the transition temperature bw rhombic sulfur and monoclinic sulfur the other sulfur are not involved
when soap dissolves in water the sodium ions and the stearate ions becoms separated from eachother. which of these ions remain in solution regardlessb of wheather the water is hard or soft?
radio waves travel at the speed of light, which is 3.00×10^8 m/s. How many kilometers will radio messages to outer space travel in exactly a year? How would I solve this problem?
how can we learn chemistry easily
what happens if anhydrous copper sulphate and hydrated copper sulphate are dissolved in water ?
Can someone help me come up with the equation to use for this problem?
Calculate the volume of H2(g) at 273K and 2.00atm that will be formed when 275mL of 0.725M HCl solution reacts with excess Mg to give hydrogen gas and aqueous magnesium chloride.
when and how does the normality and molarity of an ionic solution become equal?
is reaction of ethyl aceto acetate with beta-halo ester possible? and what is the product?
which is called queen of drugs???
i need answer must
where we get mercury?
why d block elements are called as outer transition elements and f block elements are called as inner transition elements?
as we know that electrons repeal each other because they having negative charge so and we also know that in atom there may be about 100 protons . why proton dose not repeal each in nucleus . if it repeal each other so why the nucleus dose not broken
why are the gases more easily compressed than liquid??
Write the scientific term:
1 It is produced on adding MgO to water (…………)
2 A gas produced in the previous reaction (………….)
what are the differences between metals and non-metals?
what are the substances that will produce a blue precipitate when mixed in aqueous solution.write an ionic equation for that.here are the substances magnesium carbonate, cupper sulphate, potassium iodide, ammonium chloride, potassium hydroxide, dilute hydrochloric acid, hydrogen sulphide, silver nitrate and barium chloride
What does it means by “chemistry of the earth”.
chemistry of the earth means the chemical condensation resulting to earth formation.
How would the calculated specific heat be affected if the metal cools before it is transferred to water? Higher, lower, unaffected?
plz briefly explain (lab experiment)determination of percentage of copper in brass plz send each step explanation and viva voce
by what name chenestry disover
Select all foods in which the sulfur is taken in form usable for human organism:
mineral sulfates, eg. sodium sulfate
none of these answers
Please help me answer this. I’ve understood everything else so far except this stuff:
Determine the mass of carbon monoxide that is produced when 45.6g of methane CH4 react with 73.2g of oxygen gas O2. The products are carbon monoxide, CO and water vapour H2O. You have to make a balance chemical reaction before you start. Then go from there. I cannot figure out how to balance or make a balanced equation to save my life
the products would be carbon dioxide with water. therefore the answer is CH4 + 2O2 -> CO2 + 2H2O
How is the compund h2o different from the elemants hydrogen and oxygen?
Hi im an intern at a science college and nxt week i have a to present a chemical reaction and i know that when you mix liquid ammonia with vinegar you get an explosion i want to kno how big of an explosion it makes because we have some things to put out a chemical explosion but i need to kno if i need to call a fire dep.
once formed crude oil becomes trapped in rock such as sandstone . why doescrude oil becomes trapped in sandstone.
What’s the chemical formula for ether menthol?
a correct group member of the state legislature receives a kick back from a lobbyist grouyp that wishers to defeat the flouride measure. this meber mandates that all flouride soloutionbe boiledfor 30 minutes before being used o test toxicity. now will this affect the test?
Answer—Free Radical and its mechanism in halogenation in alkane
what is the state of matter of sun and fire
Mercury is metal but why it is very soft?
According to law of conservation of mass. Mass is neither created nor gain but when we boil the milk more more it will change in the type of sweet . Then the mass of sweet is less then milk why it happens? It means that law of conservation of mass is wrong.
According to the law of conservation of mass no mass gain destroyed . But when we boil milk more and more at least it changes in the type of sweet . then why mass of sweet is less than milk .
when you boil a liquid it looses some of its matter through evaporation. this accounts for the loss of mass
Gold is metal. But why it is very expensive from all metal.
gold is rare metal as well as it is very unreactive so it is to pricious
what is the chemical formula of petrol?
I was wondering what the name of the ester derived from Salicylic Acid + Benzoic Acid would be? Salicyl benzoate?
what element mixes with H20 and p;roduces sulferiic aciid?
i love chemistry so such that i read it bt i dont seem to understand it every time i study it, pls help me cos i dont know what to do and i dont want to give up cos i’m a science student and i really need chemistry for my future course.
pls don’t give up dat is chemistry 4 u
what’s the highest volume of alcohol?
using the following equation unbalanced: please show your work
FeCl3 + K2C2O4 –> K3[Fe(C2O4)3] + KCl
What is the theoretical yield in grams of K3 K3[Fe(C2O4)3] if 7.39g of irron (III) chloride is used and potassium is present in excess.
these are some mole concept question hope you all will help
1. 3 g of a salt of molecular weight 30 is dissolved in 250 g of water.calculate the molality of the solution.
2. how many molecules of co2 are contained in one litre of air if the volume content of co2 is 0.03% at NTP
3. how many liters of liquid CCL4(density=1.5 g/cc.) must be measured out to contain 1×10^25 CCL4 molecules
step by step please
Is there a direct reaction of hydrogen gas and oxygen gas to produce water?
What volume of 4.50M HCL can be made by mixing 5.65M HCL with 250.0ml of 3.55M HCL? Calculate.
A 20cm3 sample of a gaseous alkene is completely burnt in oxygen. The total volume of the product is 80cm3. Which of the following represents the alkene?
1. Multiple Choice: The triple bond between the carbon atoms causes acetylene, C2H2, to have which of
the following shapes?
how to prepare 0.01N ethyl acttate
this answer site is not being very active,we need all the questions to be answered please,you guys should try to help us more……i want to defeat chemistry
how can we prepare sodium chloride solution by precipitation reaction?
A object with a mass of 100g
compose of 2 materials X(99%) and Y(1%)
how many grams of material Y is in the object?
molar mass: 250g/mol
molar mass: 150g/mol
Is this question solvable?
Right now I’m working on a lab and I’m totally stumped. I have an unknown salt (possibly a hydrate) and I need to figure out which it is. I’ve already determined my cation is Zn and I’m fairly certain it is a hydrate (it loses mass when heated). I’m really having trouble understanding how to figure out what my anion is though. All I know is that all the salts are made of “common” compounds. Can anyone give me any helpful hints of what to check next?
how can we minimize nuclear waste disintegration? (except by lead chamber and dump and throwing in Mars or in antartica).can a CNT(carbon nanotubes) chamber help in minimizing radiations?
a 48.90 g sample of liquid lead at 576.0 oC is poured into a mold and allowed to cool to 21.0 oC. How many kJ of energy are released in this process?
The following information is given for lead at 1atm:
boiling point = 1740oC Hvap(1740oC) = 858.2 J/g
melting point = 328.0oC Hfus(328.0oC) = 23.00 J/g
specific heat solid= 0.1300 J/goC
specific heat liquid = 0.1380 J/goC
what is rate of a reaction?
and state the collision theory
why does the m.p of nacl increased when we add cacl2 in it?
Sir how to prepare silver nitrate solution or salt from pure silver and nitric acid.Can u told me other method to prepare agno3 salt beause when we do tritate chloride against silver nitrate than end colour dont finding with him plz short out the problem
what are the compounds found in methane
Could you please suggest me any organic solvent with lewis acidity………………….
ACETYLATION OF ORTHO HYDROXY BENZOIC ACID WHICH HYDROGEN WILL BE ATTACKED FIRST,
if gold has a value of $58.54 per gram, what is the value of a cubic foot of gold?
15cm3 of hydrogen are sparked with 10cm3 of oxygen at atm pressure in eudiometer. What is the total volume of the residual has at room temperature?
With strong base in a burette and strong acid in the conical flask, which indicator will be preferred??
what is E Z configaration
and what is R S configaration
what is meant by isomerism
State three differences between a crystal and an amorphous substance?
What is surface tension?
what is the difference between 3Dmovie and all the real things ?
(real things are 3D)
What volume of a 15.6M HCI solution is required to prepare 500mL of 5.5M solution?
how many isotopes does plutonium have TODAY ???
@jannja,CiVi is equal 2 CfVf. Use it guy it will giv u 176.28ml
element x and y have electronic configuration of 2,6 and 2,8,2 respectively when they combine, the formula of the compound formed is
why is ozone present as alayerin atmosphere & not like oxygen which is lighter?
How does a difference of 1 pH unit change in terms of the concentration of H+?
which of the element have the longest atomic radius
why the e/m value of cathode rays is same for all the gases?
what is chemical
why water is a liquid and hydrogen sulphide is a gas at room temperature?
After extracting a substance, I would like to use an evaporation technique to solidify the extraction. Does the substance I’m extracting need to have certain properties to be able to crystalize? Or do I need hydrochloride for crystalization?
which is the catalyst used in laboratory preparation of hydrogen gas?
1. A sample of carbon dioxide occupies a volume of 3.5 liters at 125 kPa pressure. What pressure would the gas exert if the volume was decreased to 2.00 liters?
2. 46 ml of O2 gas is collected over water at 25oC when the atmospheric pressure is 102 kPa. What volume of pure oxygen would this be at standard temperature and pressure? (standard pressure is 101.3 kPa)
3. One common rocket engine uses the following reaction:
7H2O2 (aq) + N2H4 (g) à 2HNO3 (g) + 8H2O (g)
If the rocket engine contains 1500.0 g of H2O2 and an excess of N2H4, what volume of water vapor will be produced when the rocket fires up to a temperature of 540oC and a pressure of 1.2 atm?
4. The vapor pressure of water is 30.0 torr at 29oC. If a reaction at that temperature produces oxygen which is collected over water, what total pressure will have to be in the reaction vessel to ensure that the oxygen collected had a partial pressure of 567 torr?
5. Use Hess’s Law to determine the rH for the combustion of liquid methanol (CH3OH)?n (Remember: complete combustion reactions require oxygen and always produce carbon dioxide and water).
6. What is the sign of rS for the following reaction?
NaHCO3 (aq) + HCl (aq) à NaCl (aq) + H2O (l) + CO2 (g)
7. What is the rS for the following reaction?
H2O (l) + CaO (s) à Ca(OH)2 (s)
1 mole of a non ideal gas undergoes a change of state 92 atm,3 L,95 k)—–>4 atm,5L,245 k)wid a change in internal energy,del U=30 Latm.the change in enthalpy (del H) of the process in L-atm is?
plz ans this…
Why does hot water freeze faster than cold water?
hydrogen carries both the character of meal and non metal then why it is naot call it as a metalloid
I was told to make a solution and in the paper it reads as follows:
10 ml of .1 M NH2OH HCl -2 M HCl
Is it telling me to make the .1M NH2OH HCl in 2M HCl????
it a greet thing to some questions like what i have seen
Hello.I am looking for chemical With water (saliva) to the reaction.And does not harm the body and the production of gas The effervescent tablets.
Flourine reacts with Hydrogen (H) and with deuterium (D) to form hydrogen flouride (HF) and deuterium flouride (DF) [deuterium is an isotope of hydrogen]. Would a given amount of flourine react with different masses of the two hydrogen isotopes? Does this violate the law of definite proportions?
what is the important of benzene base on medical line
organometallic compund used as an antiseptic is;
(3) Trialkyl tin
why Pb2 is placed in both group I and IIA???
What is the for sodium chloride?
Two isotopes of silver were found to exist in sample, silver-107 and silver-108. The relative atomic mass of silver is 108, what does this suggest about the abundance of each isotope in that sample?
what is chirotopic center?
Well preserved remais of now extinct wooly mammoths are entombed in the permafrost of Siberia. Scientistis hav conducted Carbon dating experiments on plant debris found inte stomachs of the mammoths. The Carbon -14 activity of the youngest mammoths were measured at 5.8 disintegration/min/gram of Carbon. How many years ago did the Siberian Mammoths become extinct? Living tissue has a C-14 activity of 15.3 distintegration/min/gram of carbon.
This is a real question from my Chem 400. I could really use some help.
i m a stdnt f Bsc chem. i jst want to kno ‘where chemistey meets eternity,determine GOD’ as THE CHEMIST “!
what is the relationship of half life with human life
the hydrocarbon ethane undergoes complete combustion according to the following equation : 2CH+7O = 4CO + 6HO
what is the volume of oxygen is required to completely combust 5 dm3 of ethane ???
oxidation no. Of a,b,c are 2, 5 ,and -2 respectively possible formula of compound is ?
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