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Chemistry
Page 31
Questions (96,853)
Which of the following is true about lanthanides?
A. they are all radioactive B. they are highly electropositive C. they are very
5 answers
asked by
Stephanie
2,535 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
2,254 views
The average atomic mass of iridium is 192.22u, if iridium-191 has an atomic mass of 190.961u and an isotopic abundance of 37.3%
7 answers
asked by
Deepa( Exam prep question)
5,447 views
How many grams of oxygen are in 40.1 g of calcium hydroxide?
options: 17.3 g 8.64 g 20.1 g 0.541 g 11.2 g
5 answers
asked by
ABCD
3,727 views
Balance the following redox reaction in acidic conditions
Cr2O7 2- (aq) + HNO2 (aq) → Cr3+(aq) + NO3 - (aq)
5 answers
asked by
Thabiso
3,176 views
You find a piece of cloth painted with organic dye. By analyzing the dye, you find that only 83 % of the carbon-14 originally in
5 answers
asked by
sprite
5,330 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
4,945 views
Which hydrocarbon pair below have identical mass percentage of C?
A: C3H4 and C3H6 B: C2H4 and C3H4 C: C2H4 and C4H2 D: C2H4 and
7 answers
asked by
Jimmy
6,703 views
1. What is the maximum volume (at STP) of the butene mixture that could be obtained by the dehydration of 81 mg of 2-butanol?
2.
5 answers
asked by
dora
1,199 views
the ionization constant of HF is 6.7 * 10^-4. which of the following is true in a 0.1 M soultion of this acid?
the answer is HF
4 answers
asked by
safdafdsa
3,120 views
what approach do you suggest using to prevent your water sample from cooling off beore you start your measurements?
5 answers
asked by
natash
1,950 views
Redox Titrations:
a. write 2-3 sentences describing and identifying the type of chemical reaction that occurs when Fe2+ reacts
7 answers
asked by
chemstudent
1,562 views
A scientist is working in a lab and accidentally combines two liquids that quickly form a solution. Which process could be used
101 answers
asked by
Anonymous
15,471 views
The base dissociation equilibrium constant (Kb) for C5H5N is 1.40×10-9 (eq. 1).
(eq. 1): C5H5N(aq) + H2O(l) = OH-(aq) +
3 answers
asked by
sparkle
4,411 views
Consider the following substance:
Al2(SO4)3 What is the oxidation number of: a) aluminum b) sulfur c)oxygen
5 answers
asked by
sam
2,128 views
When does absorption occur in infrared spectroscopy?
A. When the frequency of the infrared radiation is the same as the
4 answers
asked by
Andrea
1,448 views
the contact process prepares purest form of sulphuric acid
2so2+o2=2so3 calculate its kp if following concentrations are found at
4 answers
asked by
Arooj
1,145 views
Al3+ is reduced to Al(s) at an electrode. If a current of 2.75 ampere is passed for 36 hours, what mass of aluminum is deposited
4 answers
asked by
YULCHANG
4,649 views
CH3CH2NH2(aq) + H2O(l) <-> CH3CH2NH3+(aq) + OH-(aq)
Kb = 5.0e-4 Ethylamine, CH3CH2NH, a weak base reacts with water according to
4 answers
asked by
Jess
9,710 views
Consider the reaction:
I2(g) + Cl2(g) 2 ICl(g) Kp = 81.9 at 25°C Calculate ΔGrxn for the reaction at 25°C under each of the
6 answers
asked by
Anonymous
4,731 views
A voltaic cell is constructed with an Ag/Ag+ half-cell and a Pb/Pb2+ half-cell. Measurement shows that thesilver electrode is
5 answers
asked by
anonymous
8,557 views
If the cell emf of a Zn-Cu cell is 0.80 V
when the concentration of Zn2+ is 2.0M, what is the concentration of Cu2+?
5 answers
asked by
Emerson
2,990 views
how do you calculate the mole fraction of HCl in an acqueous solution that contains 33.6% HCl by mass?
4 answers
asked by
franco
1,890 views
Acetone , C3H6), is the main ingredient of nail polish remover. A solution is made up by adding 35.0 ml of acetone (d=0.790g/ml)
5 answers
asked by
Tim
7,960 views
A 1.00-L solution saturated at 25°C with lead(II) iodide contains 0.54 g of PbI2. Calculate the solubility-product constant for
5 answers
asked by
DAN
5,305 views
Exactly 0.35g of divalent metal carbonate Pcarbonate were dissolved completely in 100 centimeter cubic of 0.1M HCL solution the
5 answers
asked by
Oliva
287 views
Which solution contains 0,1 mol of sodium hydroxide?
A- 1 cm3 of 0,1 mol dm3 NaOH B 10 cm3 of 0,1 mol dm3 NaOH C 100
5 answers
asked by
Mark
2,204 views
A solution was prepared by dissolving 18.00 grams glucose in 150.0 grams water. The resulting solution was found to have a
5 answers
asked by
Asdfghjkl
3,456 views
How many atoms are present in one formula unit of calcium hydrogen carbonate Ca(HCO3)2?
Could someone explain to me why the
5 answers
asked by
Cheezel
6,906 views
The heat of combustion of propane is -2,220.1 kJ/mol
calculate the heat of formation, delta Hf, of propane given that delta Hf of
4 answers
asked by
Anonymous
4,541 views
Propane (C3H8) burns in oxygen to produce carbon dioxide and water vapor. The balance equation for this reaction is C3H8 + 5O2
4 answers
asked by
Katie
7,745 views
Ionic bonds bond ions together(1 point)
because they share electrons with each other, pulling them together. because they connect
11 answers
asked by
Sans
227 views
Calculate the mass of strontium hydroxide required to make a 450-mL solution with a pOH of 4.00.
Step 1: Find pOH. I found that
4 answers
asked by
Anonymous
1,076 views
H3AsO4 reacts with water as follows:
H3aso4+h20<=>h2aso4- + h30+ The conjugate base of h3aso4 in this reaction is
4 answers
asked by
Anonymous
2,786 views
An atom in its ground state contains 18 electrons. How many of these electrons are in orbital with l = 0 values?
7 answers
asked by
sabelo
2,824 views
1. You have been given a sample of unknown molarity. Calculate the molarity of a solution which has been prepared by dissolving
3 answers
asked by
David
1,613 views
A new element has been discovered and you are on the task force to determine where this new element will be placed on the
16 answers
asked by
Sarah PLEASE HELP MEEEEE
18,423 views
Which of the following statements about the pH scale is not true?
A. In a pH expression, the hydronium ions, H3O+, can be
4 answers
asked by
jessie
4,125 views
A 230.0mL sample of a 0.275 M solution is left on a hot plate overnight; the following morning the solution is 1.50M. What
7 answers
asked by
Kim
11,761 views
a 20% solution of H2SO4 has a density of 1.14 g/mL. calculate the molarity, normality and molality of the solution.
5 answers
asked by
Anonymous
5,635 views
Determine the final volume of the solution if 0.783 grams of Na2CO3 is used to make a 0 348 M solution
Show all calculations
2 answers
asked by
Bonia
97 views
Which of the following solutions should be used when titrating a 25.00mL sample of CH3COOH that is approximately 0.1 M?
a.) 0.150
4 answers
asked by
jj re
1,667 views
Match the following states of matter with their descriptions of the particle motion
Column A 1. Gas: Gas 2. Liquid: Liquid 3.
1 answer
asked by
kali
218 views
Consider the following balanced equation.
2 H2 + O2 ---> 2 H2O Which of the following statements is false? a) One molecule of O2
5 answers
asked by
Sarah
4,271 views
36 g of HCl and 40 g of NaOH combine to form 58 g of NaCl. What is the amount of water produced in this process?
5 answers
asked by
Hii
1,238 views
The problem is: Calculate the standard free-energy change for the following reaction at 25 degrees Celsius.
2Au^+3(aq) + 3Cr(s)->
6 answers
asked by
Tiffany
14,211 views
A 0.456 gram sample of an unknown mono-
protic acid (let’s call it HZ) was dissolved in some water (you pick the amount). Then
4 answers
asked by
cheri
2,220 views
a 1.00-L solution saturated at 25°C with calcium oxalate (CaC2O4) contains 0.0061 g of CaC2O4. The solubility constant (Ksp)
5 answers
asked by
Shanice
4,142 views
Calculate the number of grams required to make 250 mL of a 0.020 M KIO3 solution.
6 answers
asked by
Kelli
2,802 views
A gas-forming reaction produces 1.35 m3 of gas against a constant pressure of 143.0 kPa. Calculate the work done by the gas in
4 answers
asked by
christie
6,108 views
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