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Chemistry
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Questions (98,744)
How do I prepare 90% formic acid from conc. formic acid (98%-100% of density 1.22g/ml)?
Please help me check if my calculations
5 answers
asked by
tricia
3,934 views
Which of the options explains low ionization energy?
a. When the valence electron is at the zeroth order b. When the valence
4 answers
asked by
Favour
421 views
400cm^3 of a gas x diffuse through a porous pot in 2 minutes. calculate the rate at which x diffuse
14 answers
asked by
Tobi
7,188 views
What is the chemical formula for slime using glue and borax?
3 answers
asked by
Bren
1,106 views
Mercury(II) sulfide, HgS, is practically insoluble in pure
water. Its solubility at 25 degrees C is probably no more than
7 answers
asked by
Helena
1,524 views
Which is true about distillation? (1 point)
It uses semipermeable membranes to filter out particles. It removes mainly large
1 answer
asked anonymously
100 views
CHECK MY ANSWERS!!!!!!!
1) Cobalt has a mass number of 59 and an atomic number of 27. A student wants to create a model of a
99 answers
asked by
☆Alexa☆
27,607 views
A 0.60mol sample of PCl3(g) and a 0.70mol sample of Cl2(g) are placed in a previously evacuated 1.0L rigid container, and the
5 answers
asked by
Anonymous
8,570 views
A 108 mL gas sample has a mass of 77.96 mg at a pressure of 1140 mmHg and a temperature of 183 °C. Assume ideal gas behavior
5 answers
asked by
keitanako
6,567 views
If Ka for HNO2,=4.5x10-4, find the [H+] a 0.9 M HNO2 solution.
5 answers
asked by
Kathy
4,661 views
What is the chemical properties of tetraoxosulphate(vi)acid
9 answers
asked by
Comfort
1,575 views
Tetraphosphorus trisulphide (P4S3) is used in the match heads of some matches. It is produced in the reaction 8P4+3S8 --> 8P4S3.
6 answers
asked by
Ana
9,738 views
When the equation for the following reaction in basic solution is balance, what is the sum of the coefficients?
MnO2 +
5 answers
asked by
Wube
8,947 views
A 1.00 g sample of limestone is allowed to react with 100 cm^3 of 0.200 mol/dm^3 HCl. The excess acid required 24.8 cm^3 of
6 answers
asked by
Gary
7,428 views
Imagine a graph. The x-axis is labeled “time” and is measured in seconds, and the y axis is labeled “potential energy”
5 answers
asked by
Garlbread
1,369 views
How is fusion different from a simple chemical reaction?
5 answers
asked by
asdfghjkl
4,879 views
1.Suppose 10 atoms of carbon (C) react with 20 atoms of oxygen (O). According to the Law of Conservation of Matter, how many
76 answers
asked by
Anonymous
26,229 views
20) The ideal value of i (van't Hoff factor) for (NH4)3PO4.
A) 2 B) 5 C) 4 D) 3 E) 1 I know the answer but how are problems like
7 answers
asked by
Jessie
17,978 views
A solution of H2SO4(aq) with a molal concentration of 8.01 m has a density of 1.354 g/mL. What is the molar concentration of
7 answers
asked by
Jhanvi
13,121 views
A student used 5.06g of a mixture of copper sulphate pentahydrate an salicylic acid in the performance of this experiment. The
4 answers
asked by
Zayn
2,324 views
Two cells are connected in series . One contains AlCl3, and the other contains AgNO3 as the electrolytes. What mass of Ag is
5 answers
asked by
Masre
2,036 views
For the following reaction, the partial pressures are listed in the table:
Substance Equlibrium H2S 5.4 I2 1.2 HI 0.43 S 7 If the
7 answers
asked by
jenny
2,607 views
Consider the reaction: 2 SO2 (g) + O2 (g) ⇋ 2 SO3 (g)
4.0 mol of SO2 and 2.2 mol of O2 were placed in a 10 L flask and allowed
5 answers
asked by
Johnny
2,603 views
In the gas-phase reaction given below, the [I2] changes from 0.400 M at 0.00 min to 0.200 M at 3.00 min. I2 + Cl2 --> 2 ICl
5 answers
asked by
Lionel
4,665 views
chemistry a semester exam?
6 answers
asked by
:)
209 views
Hydrochloric acid and sodium hydroxide react to produce water and sodium chloride in an endothermic reaction. Which statement
5 answers
asked by
Anonymous
2,171 views
if molar enthalpy of vaporization of enthanol is 38.6 kJ/mol, how many moles of ethanol are vaporize when required heat is
5 answers
asked by
Paris
2,733 views
Ammonium metavanadate reacts with sulfur dioxide in acidic solution as follows (hydrogen ions and H2O omitted):
xVO3^–^ + ySO2
5 answers
asked by
Ana
5,671 views
The ratio of the diffusion rates of two gases is given by the formula r1/r2=square root m2/square root m1 wherem1 and m2 are the
10 answers
asked by
HELP PLZ
8,685 views
The element radium has a mass number of 226 and an atomic number of 88. How many neutrons does an atom of radium have?(1 point)
8
15 answers
asked by
someone from connections
7,560 views
Conservation of mass unit test please I need these answers asap!!
17 answers
asked by
Anonymous
2,645 views
the reaction BrO3- + 3SO3 2- ---> has the rate law r= k[BrO3-][SO3 2-]. what is the order of the reaction with the respect to
7 answers
asked by
Tarkan
2,742 views
A solution is prepared in which a trace or small amount of Fe2+ is added to a much larger amount of solution in which the [OH-]
6 answers
asked by
DAN
5,376 views
What type of reaction occurs between copper (II) oxide and carbon? Give a reason for your answer.
5 answers
asked by
Douglas
2,908 views
A Balanced equation to represent the reaction between 1-pentanol and ethanoic acid. (Production of an ester)
5 answers
asked by
Shantel
10,880 views
A compound is found to be 51.39% carbon, 8.64% hydrogen, and 39.97% nitrogen. It has a molecular molar mass of 140.22 g/mol.
5 answers
asked by
spartan
4,079 views
A student prepares a 0.28 M solution of acetic acid. If the Ka of the acid is 1.76 x 10^-5, then what is the pH of the solution?
4 answers
asked by
HQade
2,404 views
What is the pH of a 0.25 M acetic acid solution if the Ka of acetic acid is 1.8 x 10-5?
2.67 0.60 5.34 11.33 I got A, 2.67. I
5 answers
asked by
Jason
3,309 views
the net ionic equation of the ionization of HClO3 in water
5 answers
asked by
Anonymous
3,340 views
A certain reaction has a delta H= -75 kJ and an activation energy of 40 kJ. A catalyst is found that lowers the Activation
4 answers
asked by
josh
4,686 views
Bomai places 7mol of Ammonia (NH3) in 14L flask. At equilibrium 0.2M Ammonium (NH4) was found in the flask. What is the
1 answer
asked anonymously
27 views
Calculate the total number of moles of gas produced from the decomposition of 10.0 g of guanidinium nitrate
I know that the
5 answers
asked by
Nesta
3,542 views
The pH of a liquid is a measure of how acidic or basic it is. The concentration of hydrogen ions in a liquid is labeled [H+].
7 answers
asked by
Tori
5,861 views
If im given mass percent and mass solvent how do I find mass solute and mass solution.
example: Mass percent = 3.8% and Mass
5 answers
asked by
Monique
8,493 views
What is the solubility of PbI2 in 0.4 M KI given the solubility constant of PbI2 is 7.1 x 10-9
a. 3.5 x 10-3 M b. 1.2 x 10-3 M c.
6 answers
asked by
Christine
3,204 views
Hydrogen is generated by passing hot steam over iron, which oxidizes to form Fe3O4 in the following equation.
3Fe(s) + 4H2O(g) ->
5 answers
asked by
Vachirawit
2,445 views
2C(s)+H2(g)+227.4kJ -> C2H2(g) is an endothermic reaction.
If 682.2 kilojoules are absorbed, how many moles of C2H2(g) are
5 answers
asked by
P
5,512 views
For melting point determination, what is the optimum rate of heating near the melting point? What are the problems, if the rate
7 answers
asked by
Sunday
4,781 views
If 50 grams of water saturated with potassium chlorate at 23*C is slowly evaporated to dryness, how many grams of the dry salt
6 answers
asked by
Rachel
3,541 views
how many "particles in solution" will form from each sucrose (C12H22O11) molecule added to water? Explain.
I don't understand
5 answers
asked by
Laura
9,184 views
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