there will be no chemical reaction
What is the volume of a 1100 g block of gold?
Answer:
The metal block had a mass of 1.50kg
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Answer:according to this picture
Explanation:
I bet no one can solve this
If an electric current of 8.50 A flows for 3.75 hours through an electrolytic cell containing copper-sulfate (CuSO4) solution, then how much copper is deposited on the cathode (the negative electrode) of the cell? (Copper ions carry two units of positive elementary charge, and the atomic mass of copper is 63.5 g/mol.)
ASSINGMENT Propane react with oxygen gas to form Carbondioxide and water a. If 2.8 mole of propone react with excess oxygen ges. how many grams of Carbondioxide will be form?
Answer:
Propane (C3H8) reacts with Oxygen gas to form Carbon Dioxide and water.
a. If 2.8 moles of Propane reacts with excess Oxygen gas how many grams of CO2 will be formed?
b. How many grams of Oxygen gas will completely react with 3.8 moles of Propane?
c. If 25 g of C3H8 reacts with excess Oxygen, how many moles of water will be formed?
d. If 38 g of water are produced in the reaction, how many moles of CO2 were produced?
Calculate the solubility of copper(II) hydroxide, Cu(OH)2, in g/L
Answer:
Ksp = [ Cu+² ] [ OH-] ²
molar mass Cu(oH )2 ==> M= 63.546 (1) + 16 (2) + 1 (2) = 97.546 g/mol
Ksp = [ Cu+² ] [ OH-] ²
Ksp [ cu (OH)2 ] = 2.2 × 10-²⁰
|__________|___Cu+² __|_2OH-____|
|Initial concentration(M)|___0__|_0______|
|Change in concentration(M)|_+S |__+2S__|
|Equilibrium concentration(M)|_S _|2S___|
Ksp = [ Cu+² ] [ OH-] ²
2.2 ×10-²⁰ = (S)(2S)²= 4S³
[tex]s = \sqrt[3]{ \frac{2.2 \times {10}^{ - 20} }{4} } = 1.8 \times {10}^{ - 7} [/tex]
S = 1.8 × 10-⁷ M
The molar solubility of Cu(OH)2 is 1.8 × 10-⁷ M
Solubility of Cu (OH)2 =
[tex]Cu (OH)2 = \frac{1.8 \times {10}^{ - 7} mol \:Cu (OH)2 }{1L} \times \frac{97.546 \: g \: Cu (OH)2}{1 \: mol \: Cu (OH)2} \\ = 1.75428 \times 10 ^{ - 5} [/tex]
Solubility of Cu (OH)2 = 1.75428 × 10 -⁵ g/ L
I hope I helped you^_^
For a colligative property such as freezing point depression, :________
a) the charge on the particle affects the property.
b) only the molar mass of the particle matters, not the number of particles.
c) the size of the particle affects the property but not the charge.
d) the number of particles matter but not what they are.
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a)
b)
c)
d)
Answer:
B
Explanation:
the fluorine has an high tendency to gain electrons from other elements with lower electronegativities
A 1 L container originally holds 0.4 mol of N2, 0.1 mol of O2, and 0.08 mole of NO. If the volume of the container holding the equilibrium mixture of N2, O2, and NO is decreased to 0.5 L without changing the quantities of the gases present, how will their concentrations change
Answer:
a) [tex]N_2=0.8mol/L[/tex]
b) [tex]O_2=0.2mol/L[/tex]
c) [tex]NO=0.16mol/L[/tex]
Explanation:
From the question we are told that:
Moles 0f Nitrogen [tex]N_2=0.4[/tex]
Moles 0f Oxygen [tex]O_2=0.1[/tex]
Volume Decrease [tex]V_2=0.5L[/tex]
Generally, the equation for Concentration is mathematically given by
[tex]C=\frac{moles}{V}[/tex]
For Nitrogen
[tex]N_2=\frac{0.4}{0.5}[/tex]
[tex]N_2=0.8mol/L[/tex]
For Oxygen
[tex]O_2=\frac{0.1}{0.5}[/tex]
[tex]O_2=0.2mol/L[/tex]
For Nitrogen
[tex]NO=\frac{0.08}{0.5}[/tex]
[tex]NO=0.16mol/L[/tex]
Which if the following symbols is NOT used to indicate a state of matter in an equation? A. None of these B. "aq" C. "l" D. "g"
Answer:
I'm not 100% sure but I think A. "None of these" is correct
Explanation:
Option B. "aq" denotes that the substance is an aqueous solution
Option C. "l" means the element is in a liquid state
Option D. "g" denotes that the substance is in a gaseous state
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The phase or state of matter is the form that is observable and is in the form of solid, liquid, or gas. The phases of the matter can be expressed as aq, l, g, s. Thus, option A is correct.
What are phases of matter?Phases of matter are distinctive and observable matters that have varying particle composition, volume, shape, symbols, etc. There are four known states of matter namely gas, liquid, plasma, and solid.
The different phases of matter have different properties like the arrangement of the particles in solid are very closed, liquids are loosely bonded, and gases have free-flowing. This makes solid rigid, liquids and gases free flow.
The phases of matter can be expressed in the equations in the brackets along the reactants and products. The solids are represented as (s), liquids (l), gases (g), and aqueous (aq).
Therefore, option A. none of these is the correct option.
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PLEASE HELP ME
a)
b)
c)
or d)?
Answer:
D / 15.0 g
Explanation:
3 % volume thus shows that there are 3 g of an solute in every 100mL of solutions
.. there will be 3 × 5000÷ 100 of H2O2 in a 500 mL bottle
Below is the structure of what should be the peptide Thr-Glu-Arg-Met. However, one of these residues has been drawn incorrectly. Identify this residue
Thr
Glu
Arg
Met
Answer:
the answer is glu and I know
The residue that has been drawn incorrectly is option (B) i.e. glu .
What is glutamate residue?Glutathione consists of a glutamate residue linked to cysteine via its γ-carboxyl rather than the α-carboxyl group and followed by a conventional peptide bond between cysteine and glycine.
It plays an important role in maintaining the proper ratio of oxidized to reduced forms of metabolically important thiols such as coenzyme A.
It also provides reducing equivalents that detoxify reactive oxygen species such as peroxides.
The tripeptide is regenerated through the concerted action enzymes in the so-called γ-glutamyl cycle.
The residue that has been drawn incorrectly is glutamate residue ,hence option (B) is correct.
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Methane (CH4) is the major component of natural gas. 40.0 grams of methane were placed in a commercial calorimeter and subjected to a combustion reaction. The reaction released 2800 kJ of energy.
1. Compare this energy value to the energy values of paraffin and isopropanol. Is methane a good choice as a fuel?
Based on comparison of energy produced per kilogram, a given mass of methane produces more energy than similar masses of either paraffin or isopropanol, therefore;
Methane is a good choice as a fuel
The reason for the above comparison conclusion is as follows:
The given information:
The details of the combustion of the methane gas, CH₄, are as follows;
The mass of the methane gas placed in the calorimeter, m = 40.0 g
The amount of heat released from the combustion of the 40.0 grams of methane = 2,800 kJ
The data from online resources of paraffin and isopropanol includes
1. The energy value of paraffin = 46 MJ/kg
The energy value of isopropanol = 33.6 MJ/kg
The energy produced from 1 kilogram of methane gas is given as follows;
40.0 g of methane gas produces 2,800 kJ of energy, therefore;
1 kg = 1,000 g of methane gas will produce, 2,800kJ/(40.0 g) × 1,000 g = 70,000,000 J
Therefore;
1 kg of methane produces 70,000,000 J = 70 MJ of energy
Therefore, energy produced from methane = 70 MJ/kg
Given that methane produces more than twice the amount of energy that
is produced from similar mass of isopropanol and more than one and half
times the amount of energy that is produced from the same mass of
paraffin, methane is a good choice as a fuel for energy
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HELP ASAP 15 POINTS
Why was Dalton's theory of the atom incorrect?
A. Dalton theorized that atoms were indivisible but they are actually made of smaller parts.
B. Dalton theorized that had negative charges spread throughout them but they are actually in electron shells.
C. Dalton' theory was correct.
D. Dalton theorized that atoms were too small to see but they are not.
Answer:
Answer is A.
Explanation:
The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons. According to Dalton, the atoms of same element are similar in all respects. However, atoms of some elements vary in their masses and densities. These atoms of different masses are called isotopes. :)
name two device that are using spinning
→ Takli
Takli is a small support style spindle. Takli is a perfect tool for spinning cotton, and this are used too to spin fibers, cotton, cashmere, and silk etc. Takli is known as handspindle. And it is the simplest device for spinning.→ Charkha
Charkha is a device for spinning thread or yarn from fibers etc. This are known as spinning wheel.HAVE A NICE DAY!Chuẩn Độ 15 ml dung dịch CH3COOH 0,2 m bằng dung dịch NaOH 0,2 m
A* tính PH tại các thời điểm trên thêm 10 ml bazơ
* tại thời điểm tương đương
Answer:
I don't know what is the answer of your question sorry never mind..Explanation:
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Complete the following radioactive decay problem.
234U → He + ?
Answer:
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Explanation:
Here we have to complete the given radioactive decay reaction:
²³⁸₉₂U → ⁴₂He + ²³⁴₉₀Th → ²³⁴₉₁Pa ? ⁴₂He + ₁¹P + ¹₀n + ⁰₁e + ₋₁⁰e.
The completed radioactive reaction is
²³⁸₉₂U → ⁴₂He + ²³⁴₉₀Th → ²³⁴₉₁Pa + ⁴₂He + ₋₁⁰e (electron).
In any radioactive reaction the mass number and the atomic number of the reactant and product will be same respectively.
The mass number and atomic number of the reactant uranium (U) is 238 and 92 respectively. Thus in the last reaction if ⁴₂He is eliminated then the mass number of the product 234 + 4 - 0 = 238.
The atomic number will be 91 + 2 - 1 = 92.
Thus the missing particle is electron (₋₁⁰e)
Draw a formula for Thr-Gly-Ala (T-G-A) in its predominant ionic form at pH 7.3. You may assume for the purposes of this question that the pKa values of the acidic groups of amino acid residues in the peptide are the same as in the amino acid itself.
Answer:
gggggggggg
Explanation:
gggggggg
The tripeptide formed from threonine, glycine and alanine is neutral at the pH of 7.3. The carboxylic end is negative charged by donating its proton to form the NH₃⁺ group.
What is peptide?Peptides are protein units formed from two or more amino acids bonded through peptide bonds. There are essential and non-essential amino acids. Essential amino acids have to be uptake from food and non-essential amino acids are synthesized inside the body.
Threonine is an essential amino acid with a CH₃CHOH side group. Glycine has the simplest side group hydrogen and alanine has CH₃ side chain. Both glycine and alanine are non-essential amino acids.
Each amino acids are represented with a three letter code or one letter symbol. Thus threonine is T, G for glycine and A for alanine. At a pH of 7.3 the peptide formed from these amino-acids contains a negatively charged carboxylic end.
A positively charged amino end made by protonation from the acid group make the overall charge zero. The structure of the peptide is given in the uploaded image.
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Atoms that have a positive or negative electrical charge are called ________.
Explanation:
They are called or known as cations
C2H5MgBr + PCl3 ra chất gì
Answer:
C2H5P
is the right answer
Which term describes the repeated arrangement of the same molecule?
Answer:
1. C
Carbon atoms
2. C
CH3CH2OH
3. C
extended structure
AND 4. B
One grey sphere, four white spheres, one red sphere
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The term which describe the repeated arrangement of same molecules is extended structure. Thus option D is correct.
What is extended structure?Extended structure can be defined as a structure in which the subunits are arranged in a repeating pattern and occur in a consistent ratio.
Sodium chloride and diamond are some of the example of extended structure.
The expanded or extended structure departs from the bilayer configuration, with well-separated hydrophilic and hydrophobic layers made up of propagating chains along the calixarene cavity axis are some characteristics.
Thus, the term which describe the repeated arrangement of same molecules is extended structure. Thus option D is correct.
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Your question is incomplete but probably your complete question was
Which term describes the repeated arrangement of the molecule?
A. Bonds
B. Atoms
C. Molecular Model
D. Extended Structure
Prove the equilibrium law of pressure kp=kc(RT)^delta n
The solution is in the pictures because the picture is large, so I cut it and also put numbers on it to know it in sequence .
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A 6.0-L vessel was found to contain 1.0 mol BrCl 3 , 2.0 mol Br 2 and 6.0 mol Cl 2 at equilibrium. What is the equilibrium constant, K c , for this equilibrium mixture for the reaction 2BrCl 3 (g) Br 2 (g) 3Cl 2 (g)
Answer:
Writing a balanced Equation for the reaction
Br₂ + 3Cl₂ ==> 2BrCl₃
Kc = [BrCl₃]² / [Br₂][Cl₂]³
Each Concentration (n) = moles/volume of container.
(nBrCl₃)= 1/6 = 0.167moldm-³
(nBr₂) = 2/6 = 0.333moldm-³
(nCl₂) = 6/6 = 1moldm-³
Kc = (0.167)² / (0.333)(1)³
Kc = 0.0838.
How is a light bulb related to radiation?
A. Light bulbs do not have anything to do with radiation.
B. A light bulb emits radiation when its filament is burned out and can longer emit light. This makes it important to remove dead lightbulbs as soon as they wear out.
C. As light is emitted from the filament, the energy in the metal is replaced as lightbulbs absorb background radiation. This prevents the filament from burning out quickly but the radiation cannot be used as power so electricity is still required for the lightbulb to work.
D. The light emitted by a light bulb is a form of radiation that occurs when the filament heats up and its thermal emission gains enough energy to move into the visible spectrum.
Answer:
As light is emitted from the filament, the energy in the metal is replaced as lightbulbs absorb background radiation. This prevents the filament from burning out quickly but the radiation cannot be used as power so electricity is still required for the lightbulb to work.
Good afternoon everyone, Define Radicals?Thank You
Explanation:
A radical is is an atom, molecule, or ion that isnt paired up with at least one valence electron.
Answer:
a radical also called a free radical is a molecule that contains at least one unpaired electron.
I hope this helps
How many molecules are in 3.6 grams of NaCl? Question options:
A 0.06
B 1.0 X 10^21
C 1.3 x 10^26
D 3.7 x 10^22
Answer:
[tex]\boxed {\boxed {\sf 3.7 * 10^{22} \ molecules \ NaCl}}[/tex]
Explanation:
We are asked to find how many molecules are in 3.6 grams of sodium chloride.
1. Convert Grams to MolesFirst, we convert grams to moles using the molar mass. These values are equivalent to atomic masses on the Periodic Table, but the units are grams per moles instead of atomic mass units. Look up the molar masses of the individual elements: sodium and chlorine.
Na: 22.9897693 g/mol Cl: 35.45 g/molThere are no subscripts in the chemical formula (NaCl), so we simply add the 2 molar masses.
NaCl: 22.9897693 + 35.45 = 58.4397693 g/molNow we will convert using dimensional analysis. First, set up a ratio using the molar mass.
[tex]\frac {58.4397693 \ g \ NaCl}{ 1 \ mol \ NaCl}[/tex]
We are converting 3.6 grams to moles, so we must multiply the ratio by this value.
[tex]3.6 \ g \ NaCl *\frac {58.4397693 \ g \ NaCl}{ 1 \ mol \ NaCl}[/tex]
Flip the ratio so the units of grams of sodium chloride cancel.
[tex]3.6 \ g \ NaCl *\frac { 1 \ mol \ NaCl}{58.4397693 \ g \ NaCl}[/tex]
[tex]3.6 *\frac { 1 \ mol \ NaCl}{58.4397693}[/tex]
[tex]\frac { 3.6}{58.4397693} \ mol \ NaCl[/tex]
[tex]0.06160188589 \ mol \ NaCl[/tex]
2. Convert Moles to MoleculesNext, we convert moles to molecules using Avogadro's Number. This is 6.022 × 10²³ and it tells us the number of particles (atoms, molecules, formula units, etc). In this case, the particles are molecules of sodium chloride. Let's set up another ratio.
[tex]\frac {6.022 \times 10^{23} \ molecules \ NaCl}{ 1 \ mol \ NaCl}[/tex]
Multiply by the number of moles we calculated.
[tex]0.06160188589 \ mol \ NaCl * \frac{6.022 \times 10^{23} \ molecules \ NaCl}{1 \ mol \ NaCl}[/tex]
The units of moles of sodium chloride cancel.
[tex]0.06160188589 * \frac{6.022 \times 10^{23} \ molecules \ NaCl}{1 }[/tex]
[tex]3.70966557*10^{22} \ molecules \ NaCl[/tex]
3. RoundThe original measurement of grams (3.6) has 2 significant figures, so our answer must have the same. For the number we found, that is the tenths place. The 0 in the hundredth place tells us to leave the 7 in the tenth place.
[tex]3.7 * 10^{22} \ molecules \ NaCl[/tex]
There are [tex]3.7 * 10^{22} \ molecules \ NaCl[/tex] in 3.6 grams and the correct answer is choice D.
2. The reaction of a triglyceride with methanol in the presence of a strong base to form
methyl esters and glycerol is called
O A. transesterification.
O B. saponification.
O C. ester formation.
O D. dehydration condensation.
Answer:
The answer it's A. transesterification
Which compound shows maximum hydrogen bonding with water? a-Methyl Alcohol b-Ethyl alcohol. Give reason too please.
A) In ethanol, the OH group is present. This means an H atom is attached to an O atom. The electronegativity of an O atom is much greater than an H atom because of this the H atom will get a partial positive charge and the O atom will get a partially negative charge. This is known as a dipole. Hence dipole-dipole interactions will get generated in the molecule and attractive forces will be produced among the molecules of ethanol.
B) There is no hydrogen bonding between diethyl ether molecules because there is no hydrogen atom attached to an electronegative atom like oxygen or nitrogen. So diethyl ether does not show hydrogen bonding.
C) Chlorine is less electronegative as compared to oxygen and nitrogen so it does not show hydrogen bonding. So, ethanol has more hydrogen bonding than ethyl chloride.
D) In trimethylamine, the nitrogen atom is not attached to any hydrogen atoms. So, it will not show any hydrogen bonding.
According to above mentioned points, we can conclude that out of the given options ethanol will have maximum hydrogen bonding.
So, the correct option is (A).
Additional Information:
Properties of hydrogen bonding :
i) Solubility: Because of the hydrogen bonding between water and alcohol molecules, lower alcohols are soluble in water.
ii) Volatility: Compounds having hydrogen bonding between different molecules have a higher boiling point and a higher boiling point means the compound is less volatile.
iii) Viscosity and surface tension: The substances which contain hydrogen bonding exist as an associated molecule. They have higher viscosity and high surface tension
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a)
b)
c)
d)
Answer:
C.
Explanation:
In warm air, stuff expands, and in cold air, things condense, or decrease in size.
A buffer is a solution that: Select one: a. Results from mixing a strong acid and a strong base. b. When added to another solution, decreases the pH. c. When added to another solution, increases the pH. d. Prevents a drastic change in pH when an acid or base enters a solution.
Answer:
d. Prevents a drastic change in pH when an acid or base enters a solution.
Explanation:
The purpose of a buffer is to resist pH change and keep the solution relatively stable.
proteins contain
a. oxygen
b. nitrogen
c. hydrogen
Answer:
All of the above
Explanation:
Proteins contain a long chain of amino acids which are a chain of oxygen, nitrogen, carbon, hydrogen or sulfur.
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Do the tests performed to identify DNA exclude the presence of RNA?
DNA and RNA can also be ISOLATED from the same biological sample.
So the answer is no, both DNA and RNA are together.
Answer:
so the answer is no
both DNA and RNA are together.
Explanation:
DNA and RNA can also be ISOLATED from the same. biological sample
