Questions LLC
Login
or
Sign Up
Ask a New Question
Chemistry
Page 9
Questions (96,421)
Katie found a sample of an unknown solid. She performed a series of experiments to determine some of its properties. Her
3 answers
asked by
ANSWER CORRECTLY
62 views
Use the equation to complete the activity. 21986 Rn→21584 Po+ Alpha The nuclear equation shows the transmutation of a form of
3 answers
asked by
hatemaths
59 views
A 25.0ml sampla of H2SO4 is titrated with 30.0ml of 0.150m NaOH.calculate the concentration of the H2SO4.
2 answers
asked by
Leilanie
160 views
observation made when chlorine is bubbled through sodium iodide
4 answers
asked by
value mwende
4,558 views
MnS(s) + 2 H+ --> Mn2+ + H2S(g)
At 25 C the solubility product constant, Ksp, for MnS is 5 x 10-15 and the acid dissociation
5 answers
asked by
AL
5,138 views
When an element is burnt in excess oxygen, is the oxide formed always:
1. a crystalline solid 2. greater in mass than the element
5 answers
asked by
Monica
2,771 views
If I want to prepare 5.0 liters of a 0.25 M solution of NH4Cl, how many grams of the salt should I weight out?
5 answers
asked by
Krew
2,247 views
Calculate the lattice energy of potassium oxide from the following data:
Enthalpy of sublimation of potassium: +89.24 kJ/mol Bond
5 answers
asked by
Joanie
13,447 views
A typical soap molecule consists of a polyatomic anion associated with a cation. The polyatomic anion containd hydrogen, carbon
5 answers
asked by
celina
3,131 views
2.78g NaHCO3 dissolve in enough water to make 200.0ml of solution
4 answers
asked anonymously
938 views
A cell can be prepared from copper and tin. What is the E° cellfor the cell that forms from the following half reactions?
Cu2+(a
7 answers
asked by
lucylu
5,628 views
What is the most important source of error in the calorimeter experiment?
I know few, but I don't know what is the most important
5 answers
asked by
miyabi
8,611 views
Bromine has two naturally occurring isotopes. Bromine-79 has a mass of 78.918 amu and is 50.69% abundant. Using the atomic mass
7 answers
asked by
Anonymous
15,779 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
4,462 views
Write formula equations and net ionic equations for the hydrolysis of sodium carbonate in water.
Responses Chemistry - DrBob222,
7 answers
asked by
anonymous
8,968 views
Hydrochloric acid and sodium hydroxide react to produce water and sodium chloride in an endothermic reaction. Which statement
5 answers
asked by
Anonymous
2,118 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
3,480 views
We did not use the volume of the water added initially to the Erlenmeyer in our calculations. Why?
5 answers
asked by
Kim
1,920 views
Hi! I am taking the Unit 8 Lesson 10 chem test now and I have a C in this class so I need to get all the answers correct... If
7 answers
asked by
Yarielis
2,521 views
calculate the lattice enthalpy of potassium fluoride from the following data:
enthalpy of formation of K(g): +89 kJ · mol−1
5 answers
asked by
alexandra
6,736 views
Describe suitable laboratory procedure for obtaining pure water from the titration mixture H2So4+NaoH
4 answers
asked by
Anonymous
1,156 views
“Green” material has high amounts of (1 point)
Responses carbon. carbon. magnesium. magnesium. phosphorus. phosphorus.
10 answers
asked by
UnicornLover36
229 views
What must happen for a natural resource to become a synthetic material?(1 point)
It needs to be dried out. It needs to go through
9 answers
asked by
kendell
1,573 views
Calculate the number of ions present in 7.45 grams of potassium oxide.
( At.mass of K= 39u).
6 answers
asked by
elby
7,461 views
how many total atoms are there in the chemical formula B2(CO3)3
5 answers
asked by
stephanie
3,177 views
The number of moles of H2O produced in reaction of 50ml 1.0 M HCl and 50mL 1.0 M Naoh
6 answers
asked by
Amanda
9,701 views
A student adds 5 g each of sand, sugar, and salt to 50mL of water. Did he make a solution? Explain.
9 answers
asked by
Fabricio
2,401 views
H2O2→ O2 + 2H+ + 2e- OCl- + 2H+ + 2e-→ H2O+ Cl- H2O2(aq) + OCl-(aq) → H2O(l) + Cl- (aq) + O2(g)Assign oxidation numbers to
4 answers
asked by
B
5,240 views
Two chemists measure the densities of an unknown metal sample. They both find that the sample has a density of 8.94 g/mL.
5 answers
asked by
basketball&batman
1,436 views
The half-life of lead is 22 years. How long will it take for a sample of this substance to
decay to 80% of its original amount
4 answers
asked by
Anonymous
4,996 views
How many moles of oxygen atoms are there in 2 moles of CuSO4?
5 answers
asked by
John
1,027 views
Given the table below predict the numerical value of the standard cell potential for the reaction:
2 Cr(s) + 3 Cu2+(aq) 2
4 answers
asked by
Anya
3,514 views
You place 1.234 g of solid Ca(OH)2 in 1.00 L of pure water at 25°C and it partially dissolves. The pH of the solution is 12.40.
4 answers
asked by
Kelly
1,082 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
17,898 views
What is the maximum mass, in grams, of NH3 that can be produced by the reaction of 1.0 g of N2 and 1.0 g of H2 using the
6 answers
asked by
Katelyn
26,420 views
What is the enthalpy for the following reaction?
overall: C2H4+H2O--->C2H5OH is -1411kJ correct??
7 answers
asked by
Angel
10,441 views
At 40 degrees Celsius, the value of Kw is 2.92 X 10^-14
a.) calculate the [H+] and [OH-] in pure water at 40 degrees celsius
7 answers
asked by
Rebekah
13,414 views
A solution in which [H+] is 1000 times greater than [OH-]
[OH-] = ?M
5 answers
asked by
Matt D
11,258 views
Calculate the theoretical amount of .5M NaOH that it would take to neutralize approx. 2.0 g KHP. KHP is a monoprotic acid, the
5 answers
asked by
Brad
4,846 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
8,090 views
The organic compound di-n-butyl phthalate, C16H22O4(l), is sometimes used as a low-density (1.046 g·mL–1) manometer fluid.
5 answers
asked by
Garcia
10,218 views
What is the net ionic equation for the precipitation of nickel sulfide from aqueous solution.
5 answers
asked by
Anonymous
8,238 views
The solubility product constant, Ksp, for nickel (II) carbonate, NiCO3, is 1.3 x 10-7 at 25C.
a. Write the balanced chemical
5 answers
asked by
...
3,360 views
P4 + HNO3 = H3PO4 + NO2 + H20 by partial method balancing
5 answers
asked by
Durgesh
6,231 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
9,168 views
Consider the combustion of propane:
C3H8(g)+5O2(g) yields 3CO2(g) + 4H2O(l) delta H= -2221 kJ Assume that all of the heat comes
5 answers
asked by
Shellby
8,507 views
Determine the pH of a solution made by diluting 25mL of 6.0 M HCl until the final volume of the solution is 1.75 L
6 answers
asked by
Dylan
5,960 views
The concentration of a hydrochloric acid solution is 0.5mol/dm3.
How many moles of hydrochloric acid are present in 25cm3 of this
7 answers
asked by
Muhammad Haris
3,714 views
How many kilojoules of heat are required to melt a 10.0 g popsicle at 0 degress C? Assume the popsicle has the same molar mass
7 answers
asked by
Anonymous
8,290 views
Consider the balanced chemical equation: 3Sr(OH)2(aq) + 2H3PO4(aq) → Sr3(PO4)2(s) + 6H2O(l). How many moles of Sr(OH)2 remain
7 answers
asked by
Mike
5,125 views
Pages
1
2
3
4
5
6
7
8
9
10
Parent Categories (62)
Academic Subjects
Advanced Placement (AP)
Arts and Sciences
Biology
Career
Earth Science
Education
Educational Resources
Experiments
General science
High School
History and Science
Homework Help
Industries
Majors
Math
Math and Science
Math/Science
Mathematics
Mathematics & Science
Mathematics and Science
Movies
Natural Sciences
Online Discussion
Physical Science
Physical Sciences
Physics
Science
Science & Environment
Science & Medicine
Science & Nature
Science and Biology
Science and Education
Science and Engineering
Science and Environment
Science and Experimentation
Science and Experiments
Science and Geography
Science and Health
Science and Math
Science and Mathematics
Science and Medicine
Science and Nature
Science and Research
Science and Technology
Science Education
Science Experiment
Science Experiments
Science Safety
Science/Educational
Science/Math
Science/Mathematics
Science/Molecular Biology
Science/Physics
Science/Technology
Sciences
Scientific Experiment
STEM (Science, Technology, Engineering, and Mathematics)
STEM (Science, Technology, Engineering, Mathematics)
Subjects
Test Preparation
Word Problems