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Chemistry
Page 10
Questions (97,996)
Hydrocarbons A and B both contain 85.7 % carbon. Their molar masses are 42 and 84 respectively.
a) Which elements does a
6 answers
asked by
Amir
3,318 views
If a certain oxide of nitrogen weighing 0.11g gives 56 ml of nitrogen and another oxide of nitrogen weighing 0.15 g gives the
6 answers
asked by
Akashdeep
4,970 views
The concentration of hydroxide ions in a solution of nitric acid 0.2 M is:
a. 2 x 10-14 M b. 5 x 10-14 M c. 5 x 10-7 M d. 2 x
5 answers
asked by
scilover
1,783 views
A 20 g mixture containing 95% (by weight) of A and 5% of B is recrystallized in toluene (b.p. 110 C). Solubility for compound A
7 answers
asked by
Eric
4,481 views
Science
CHECK MY ANSWERS!!!!!!! 1) Cobalt has a mass number of 59 and an atomic number of 27. A student wants to create a model
20 answers
asked by
DrBob222
6,564 views
A buffered solution was created by mixing solutions of NH4Cl and NH3 at 25 C. Which species, NH4+ or NH3, has the highest
4 answers
asked by
Sara
2,424 views
What would be the pH of a solution prepared by combining equal quantities of NaH2PO4 and Na2HPO4? Explain with an equation.
6 answers
asked by
ERAGON
7,161 views
Please! This is urgent!
I don't know how to do this. Determine the solubility at 25°C of Cd(IO3)2 in water and in 0.20 M CdCl2.
4 answers
asked by
Andrea
2,319 views
Separate this redox reaction into its component half-reactions.
O2+2Cu---->2CuO thought it was: Oxidation 2e-+O2---->2O(-2)
5 answers
asked by
Cari
8,716 views
Which statement about a chemical reaction supports the claim that mass is conserved?(1 point)
The reactants and products have the
13 answers
asked by
Shottaflow3k
6,089 views
We did not use the volume of the water added initially to the Erlenmeyer in our calculations. Why?
5 answers
asked by
Kim
1,959 views
What mass of an NO2 is formed when and NO reacts with 384 g of O2?
5 answers
asked by
MsHemmoPenguin
4,128 views
a 10 ml vinegar sample was completely neutralized by 22.5 0.2M NaOH solution . calculate the molarity and percent acetic acid in
4 answers
asked by
shannan
2,931 views
Practical: test for aldyhides and ketones using KMnO4 and Tollen's test reagent
Aim: investigations unknown samples A,B and C
26 answers
asked by
Galmai Simon
170 views
“Green” material has high amounts of (1 point)
Responses carbon. carbon. magnesium. magnesium. phosphorus. phosphorus.
10 answers
asked by
UnicornLover36
243 views
In s 0.30 mol/L HNO3(aq) solution.
a) what is the concentration of nitric acid molecules. b)what is the hydroxide ion
7 answers
asked by
JM
3,424 views
a 6.0 L vessel contained 0.0222 mol of phosphorus trichloride, 0.0189 mol phosphorus pentachloride and 0.1044 mol of chlorine at
4 answers
asked by
Bristol
1,876 views
Explain briefly how pure dry crystals of calcium chloride could be obtained from a solution of calcium chloride.
10 answers
asked by
Assan Joof
2,229 views
What Volume of nitrogen at STP would be required to react with 0.100 mol of hydrogen to produce ammonia?
N2(g) +3H2 (g)(arrow)
6 answers
asked by
Mandy
2,959 views
KMnO4 + HCl → MnCl2 + Cl2 + H2O + KCl
If the reaction occurs in an acidic solution where water and H+ ions are added to the
4 answers
asked by
Summer
1,487 views
The nonmetals in Groups 6A and 7A ____.
a. lose electrons when they form ions b. have a numerical charge that is found by
5 answers
asked by
Maye
9,976 views
make 200.0 mL of a pH 5.00 buffer from 0.200 M acetic acid and 0.100 M sodium acetate. Calculate the volume of 0.200 M acetic
4 answers
asked by
GEN CHEM
881 views
I really need help with this question for my chem H.W.
1) On a summer day in Breckenridge, Colorado, the atmospheric pressure is
4 answers
asked by
Lisa
1,340 views
An aqueous solution of calcium chloride boils at 101.3. How many kilograms of calcium chloride were dissolved in 1000 g of the
5 answers
asked by
Nita
2,938 views
Calculate the standard cell emf for galvanic
cells with the cell reaction 2 H2(g) + O2(g) → 2 H2O(ℓ) in acidic solution.
4 answers
asked by
tyler
609 views
What mass of KIO3 is needed to convert the copper in 0.2750 g of CuSO4 · 5H2O to
Cu(IO3)2?
4 answers
asked by
Liam
4,325 views
if 3 mole of of calcium react with 3 mole of oxygen then what
substance is limiting reactant?
5 answers
asked by
Tsion
2,656 views
HA and HB are two strong monobasic acids.
25.0cm3 of 6.0moldm–3 HA is mixed with 45.0cm3 of 3.0moldm–3 HB. What is the H+(aq)
6 answers
asked by
Anna
8,123 views
For the following reaction, Kp = 3.5 104 at 1495 K.
H2(g) + Br2(g) 2 HBr(g) What is the value of Kp for the following reactions
5 answers
asked by
Elizabeth
11,001 views
Calculate the percentage by mass of silicon tetrachloride.
5 answers
asked by
Dominion favour
1,147 views
In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of
6 answers
asked by
Katrina
5,017 views
In the reaction 2H2S + 3O2 -> 2SO2 +2H2O, the oxidizing agent is
1.oxygen 2.water 3.sulfur dioxide 4.hydrogen sulfide oxygen?
7 answers
asked by
Alexis
9,205 views
Calculate the total number of atoms in 0.00102 mol CH3(CH2)4CH2OH
The answer in the back of my book says 1.29 x 10^22 but i do
5 answers
asked by
Bob
4,927 views
Calculate the pH of a solution that was created by combining 250.0 mL of 0.25 M HCl with 100.0 mL of 0.11 M HI. Assume the
4 answers
asked by
...
1,867 views
For the following fusion reaction, Calculate change in energy per mole.( Answer in J/mole)
2H1 + 2H1 ---> 3H1 + 1H1 (the mass
5 answers
asked by
Mima
8,944 views
Which of the following reactions have a positive ΔSrxn? Check all that apply.
A(g) +B(g) -----> 3C(g) A(g)+ B(g)------> C(g) 2A
6 answers
asked by
Jerry
18,459 views
Why do the rate of reaction for a reversible reaction slows down at equilibrium stage.
5 answers
asked by
Rose
1,896 views
If you add 5.0 mL of 0.50 M NaOH solution to 20.0 mL to Buffer C, what is the change in pH of
the buffer? (where buffer C is
5 answers
asked by
Chelsea
5,689 views
What is the mass of 3.01 x 10^22 iron (II) ions, Fe^2+?
5 answers
asked by
Syndra
3,388 views
How many milliliters of 14.5 M NH3 are needed to prepare 6.5 liters of 0.40 M NH3?
4 answers
asked by
Lilit ***
1,675 views
•Which of the following solutions will be the best buffer at a pH of 9.26? (Ka for HC2H3O2 is 1.8 x 10–5; Kb for NH3 is 1.8
4 answers
asked by
anita
6,900 views
A 1.575 g sample of ethanedioic acid crystals, H2C2O4. xH20 was dissolved in water and made up to 250cm^3 . One mole of the acid
6 answers
asked by
Jack
5,671 views
11. How many molecules would there be in 0.70 moles of CO2?
5 answers
asked by
heyo ❄
870 views
A current of 45A is pass through a solution of gold salt for 1hours 45minute. Calculate Mass of gold deposited, b) number of
7 answers
asked by
Abimbola
2,662 views
Enter the balanced complete ionic equation for HCl(aq)+K2CO3(aq)→H2O(l)+CO2(g)+KCl(aq)
Would it be: 2H+(aq) + 2Cl^-(aq) +
4 answers
asked by
Brandon
6,308 views
How many liters of CO2 form at STP if 5.0g of CaCO3 are treated with excess hydrochloric acid? show all your work
5 answers
asked by
nichole
4,161 views
Calculate the pOH of a 0.410 M Ba(OH) solution.
5 answers
asked by
Anonymous
4,684 views
A sample of ethanol, C2H5OH, weighing 2.84 g was burned in an excess of oxygen in a bomb calorimeter. The temperature of the
4 answers
asked by
Lance
4,446 views
In a particular redox reaction, MnO2 is oxidized to MnO4– and Cu2 is reduced to Cu . Complete and balance the equation for
7 answers
asked by
BOB
9,238 views
Why must a hole be made in the aluminium lid
7 answers
asked by
Abbot
1,782 views
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