Answer:
The nitrogen atom has 5 electrons in the outermost shell, so it can accept 3 electrons to fulfil the octet structure. Therefore the valency of nitrogen is 3.
Aspirin (acetyl salicylic acid) is a weak acid with the chemical formula HC9H7O4. The solubility of aspirin is 4.6 g per 1.00 L solution, and a saturated solution of aspirin has a pH of 2.56. Write the expression (chemical equation) that describes the saturated solution.
Answer:
HC₉H₇O₄(aq) + H₂O(l) ⇄ C₉H₇O₄⁻(aq) + H₃O⁺(aq)
Explanation:
A weak acid as aspirin, HC₉H₇O₄, is in equilibrium with water as follows:
HC₉H₇O₄(aq) + H₂O(l) ⇄ C₉H₇O₄⁻(aq) + H₃O⁺(aq)This is the chemical equation that describes the process.
As you can see, not all aspirin is dissolved, just a part that is converted in its conjugate base (A weak acid doesn't dissociate completely!).
Also, the pH is decreasing because the hydronium ion (H₃O⁺) is produced in the equilibrium (Remember, if you have an increasing in H₃O⁺ concentration the pH will decreases and vice versa).
Cyclohexanecarboxylic acid, C6H11COOH (pKa 4.90), is only slightly soluble in water, but its sodium salt, C6H11COO-Na , is quite soluble in water. Describe the solubility of cyclohexanecarboxylic acid in solutions of sodium hydroxide, sodium bicarbonate (NaHCO3), and sodium carbonate (Na2CO3). The pKa values for the conjugate acids of sodium hydroxide, sodium bicarbonate (NaHCO3), and sodium carbonate (Na2CO3) are 15.7, 6.36, and 10.33, respectively.
Answer:
See explanation
Explanation:
Carboxylic acids are all soluble in solutions of NaOH, Na2CO3 and NaHCO3 due to the formation of a sodium salt of the acid.
In all these cases, the sodium salt of cyclohexanecarboxylicacid formed is more soluble in water than the parent acid.
When the acid is dissolved in sodium bicarbonate or sodium carbonate, carbon dioxide gas is also evolved.
what is it called when you apply science and mathematics to real life problems
Answer:
I think S.T.E.M but i'm not 100% sure
Explanation:
3
Atomic
Atomic
Atomic
ons, an...
Protons
Neutrons Electrons
symbol
number
mass
TABLE...
lack to ...
B
6
11
24
31
37
39
89
Answer:
CCCCCCCCCCCCCCCCCCCC THATS THE ANSWER
Explanation:
We should exhaust all possiblr resources from nature says a miner?
Answer: No
Explanation: Some scientists have declared that mineral deposits containing important non renewable resources such as copper and zinc will be exhausted in a few decades if consumption does not decrease.
If I initially have a gas at a pressure of 10.0 atm, a volume of 24.0 liters, and a temperature
of 200. K, and then I raise the pressure to 14.0 atm and increase the temperature to 300. K,
what is the new volume of the gas?
Answer:
The new volume of gas is 25.7 L.
Explanation:
Given data:
Initial volume = 24.0 L
Initial pressure = 10.0 atm
Initial temperature = 200 K
Final temperature = 300 K
Final volume = ?
Final pressure = 14.0 atm
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 10.0 atm × 24.0 L × 300K / 200 K × 14.0 atm
V₂ = 72000 atm .L. K / 2800 K.atm
V₂ = 25.7 L
The new volume of gas is 25.7 L.
What element has the following electron configuration:
1s22s22p63s23p2
Five characteristics of gas,solid and liquid(make brainest)
Answer:
1. Gases have neither definite shape nor definite volume. They expand to the size of their container.
2. Gases are fluid, and flow easily.
3. Gases have low density, unless compressed. ...
4. Gases diffuse (mix and spread out) and effuse (travel through small holes).
Explanation:
Which of the following could result from a substance that undergoes a physical change
Answer:
B. It undergoes phase change.
Explanation:
A copper wire is composed of billions of copper units. In this case, the copper in the wire is a(n) __________.
A. atom
B. molecule
C. compound
D. mixture
E. element
what do you mean by the region or space that an electron revolves the nucleus in an atom?
An atomic orbital is a mathematical feature describing the region and wave-like behavior of an electron in an atom. This characteristic can be used to calculate the opportunity of finding any electron of an atom in any precise location across the atom's nucleus.
What's the vicinity of space in which there's a high opportunity of locating an electron?An atomic orbital is regularly idea of as a location of space wherein there is an excessive opportunity of finding an electron. Every energy level corresponds to an orbital of a one-of-a-kind form, which describes wherein the electron is probable to be observed.
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Describe the porosity and permeability of Antarctic soil.
Answer:
Explanation: Geography · College. +5 pts ... Answer. 1.9/5. 16. Girly1004. Ambitious. 1 answer. 4 people helped ... are places that show evidence of a massive ice sheet that existed around 250 million years ago.
J.J. Thomson discovered the electron in 1897. In 1904, he proposed a model of an atom, describing that there was an equal distribution of negative and positive charges throughout the atom. In 1909, Ernest Rutherford tested J.J. Thomson’s model by shooting positive particles at gold foil. Based on Thomson's model, it was predicted that the particles would fly through the foil with a small amount deflected back. Analyzing the results, Rutherford discovered that more of the particles bounced back than expected. Which of the following best explains how the results of Rutherford’s experiment affected Thomson’s widely-accepted atomic model?
A. Rutherford’s results were invalidated and discarded because Thomson’s model was correct.
B. Rutherford’s results supported parts of Thomson's model, but also provided new data and interpretations.
C. Rutherford’s results suggested that the model proposed by Thomson was based on false research and required a change in his hypothesis.
D. Rutherford’s results supported Thomson’s model that there was a negative core surrounded by positive charges and caused a modification in the overall atomic theory.
Rutherford's results declined the results of Thomson's model, the correct option is C.
What are Atomic models?Atomic Models are the scientific theories proposed to determine the structure of an atom.
There are mainly 5 theories proposed for atomic models.
1. John Dalton's Atomic Model: An atom is the basic building block of all physical entities in the universe.
2. Plum Pudding Model, created by J.J. Thomson, uses the comparison of plum pudding, where the positive charge is uniformly dispersed throughout and the negative charge is randomly sprinkled on top, to explain how subatomic particles are structured.
3. Rutherford's model: proved the presence of a nucleus.
4.Niel Bohr's model: Arrangement of electrons in shells.
5. Erwin Schrodinger's model is also called as Quantum Model.
In J.J. Thomson's model, the equal distribution of positive and negative charges is proposed while,
Rutherford's theory declines this arrangement and proposes that the positively charged nucleus occupies a very small part and there is empty space in the atom.
So, Rutherford’s results suggested that the model proposed by Thomson was based on false research and required.
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Which is the correct name for P205?
O phosphorus dioxide
O phosphorus pentoxide
diphosphorus pentoxidev
diphosphorus hexaoxide
Answer:
Diphosphorus Pentaoxide
Explanation:
We have 2 atoms of Phosphorus and 5 atoms of Oxygen. It is a covalent bond.
2 is Di
5 is penta
Diphosphorus Pentaoxide
Answer:
C. Diphosphorus Pentaoxide
Explanation:
Complete and balance each of the following equations for acid-base reactions.
HC2H3O2(aq)+NaOH(aq)→
Answer:
HC2H3O2 + NaOH = H2O + NaC2H3O2 - Chemical Equation Balancer.
Answer:
please check the image :)
If you include structures in which sulfur has an expanded octet and exclude structures with triple bonds, how many resonance structures can be drawn for sulfur trioxide, SO3
Answer:
Seven
Explanation:
SO3 has a trigonal planar structure. The most apt bonding description is that of sulphur forming three sigma bonds giving rise to the plane triangle and then the presence of three delocalized pi bonds.
Plausible resonance structures for SO3 has been shown in the image attached. In all the structures, there is none in which sulphur is pictured as having triple bonds.
image credit: socratic
How many grams of mgcl2 must be provided 1.89 mole of chloride ions
Answer:
Mass = 89.97 g
Explanation:
Given data:
Number of moles of chloride ions = 1.98 mol
Mass in grams of MgCl₂ present = ?
Solution:
we can see that 1 mole of MgCl₂ contain 2 moles of chloride ions. Thus 1.89 moles of chloride ions contain moles of MgCl₂ are,
Cl₂ : MgCl₂
2 : 1
1.89 : 1/2×1.89 = 0.945
Thus, 1.89 moles of chloride ions are provided by 0.945 moles of MgCl₂.
Mass of MgCl₂:
Mass = number of moles × molar mass
Mass = 0.945 mol × 95.211 g/mol
Mass = 89.97 g
A tree burns down and forms ashes
Physical or
Chemical
Answer:
It is a chemical change.
Explanation:
A tree burning down would be a chemical change because the composition of the tree is what changes, not just the physical characteristics.
Why is the wavelength of 633 nm used to analyze the standard solutions and drink samples?
Group of answer choices
The lower the wavelength, the blue solutions will absorb more light.
Corresponding with orange light, is the wavelength that blue solutions absorb the most.
Corresponding with blue light, is the wavelength that blue solutions absorb the most.
The higher the wavelength, the blue solutions will absorb more light.
Answer:
Corresponding with orange light, is the wavelength that blue solutions absorb the most.
Explanation:
When light is passed through a solution of a particular color, light of other wavelength or color, is absorbed and disappears, whereas the wavelength of light corresponding to the color of that solution is transmitted. The color of light absorbed the most is that which is complementary (opposite it in the color wheel) to the light which is transmitted. In a color wheel, blue is complementary to orange color, red is complementary to green and yellow is complementary to violet.
Therefore, in a blue substance (as in the blue solutions), there would be a strong absorbance of the complementary color of light, orange. Since the wavelength of orange color of light is between 600 - 640 nm, with maximum absorbance of orange light occurring around 633 nm, the wavelength of 633 nm is used to analyze the standard solutions and drink samples.
For the equation 2H₃PO₄ + 3Ca ⇒ 3H₂ + Ca₃(PO₄)₂ suppose you had 27.4 grams of H₃PO₄?
a. How many grams of Ca would you need to react with this number of moles of H₃PO₄?
b. How many grams of hydrogen gas will be produced?
c. How many moles of calcium phosphate will be produced?
Please answer all questions clearly, with work shown! Thank you!!
Answer:
Explanation:
Given 2H₃PO₄ + 3Ca ⇒ 3H₂ + Ca₃(PO₄)₂
27.4g
=(27.4g/98g/mol)
= 0.280 mole H₃PO₄ used
Ca Used:
Rxn Ratio H₃PO₄ : Ca => 2:3
∴ moles Ca used = 3/2(0.280) mole Ca =0.420 mole Ca
grams Ca used = 0.420 mole Ca x 40 g/mole = 16.8 grams Ca used
Grams H₂ Produced:
Rxn Ratio H₃PO₄ : H₂ => 2:3 => moles H₂ produced = 3/2(0.28 mole H₂) = 0.420 mole H₂ = (0.420 mole H₂ x 2.02 g/mole) = 0.8484 grams H₂(g) Produced.
Moles Ca₃(PO₄)₂ Produced:
FWt Ca₃(PO₄)₂ = 310 g/mole
Rxn Ratio H₃PO₄ : Ca₃(PO₄)₂ => 2:1
∴moles Ca₃(PO₄)₂ Produced = 1/2(moles H₃PO₄ used)
= 1/2(0.28 mole) = 0.14 mole Ca₃(PO₄)₂
If you want grams Ca₃(PO₄)₂, multiply moles Ca₃(PO₄)₂ by formula weight.
How many grams of sodium are in .500 of a mole
Convert mole to gram by multiplying the molar mass of sodium
0.500mol Na x 22.990g = 11.495g of Na
which layer of Earth creates a magnetic field and shields us from the Sun's destructive solar wind?
The outer core is the layer of Earth creates a magnetic field and shields us from the Sun's destructive solar wind.
It is called a magnetic field to a space in which magnetic phenomena take place due to the influence of a body with properties of electric charges.
The earth's magnetic field is mainly produced by the electric currents that occur in the outer core, liquid in nature, which is composed of highly conductive cast iron.
As the center of the Earth cools, part of the iron contained in the fluid outer core solidifies and becomes part of the inner core.
The outer core changes its chemical composition and becomes less dense, generating convective currents.
This process, together with the Coriolis effect (product of the Earth's rotation) generates strong helical convection currents that align with the axis of rotation.
The Earth is mostly protected from the solar wind, a stream of energetic charged particles emanating from the Sun, by its magnetic field, which deflects most of the charged particles.
These particles would destroy the ozone layer, which protects the Earth from harmful ultraviolet rays.
Therefore, we can conclude that the outer core is the layer of Earth creates a magnetic field and shields us from the Sun's destructive solar wind.
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Calculate the number of hydrogen atoms in 41.4 g of
ethyl alcohol, C2H60.
Answer:
3.25 x 10²⁴ atoms of H
Explanation:
First you have to convert from grams to moles of C₂H₆O using the molar mass of C₂H₆O, which is 46.06 g/mol. Then convert from moles of C₂H₆O to moles of H using the ratio within the compound; for every molecule of C₂H₆O, there are 6 H atoms. Then lastly, because moles just represent a number in the same way a dozen does, we convert from moles of H to the number of atoms of H. 1 mole H = 6.022 x 10²³ atoms of H.
[tex]41.4g*\frac{1molC2H6O}{46.06C2H6O} * \frac{6 mol H}{1molC2H6O} * \frac{6.022 * 10^2^3atomsH}{1molH} = 3.2476 x 10^2^4atomsH[/tex]
Round to lowest number of significant figure which is three to get 3.25 x 10²⁴.
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The the total number of atoms of hydrogen atoms in 41.4 g of ethyl alcohol, C₂H₆0 is 5.35×10²³ atoms.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
Number of atoms =number of moles×6.022×10²³ (Avogadro number)
number of moles= given mass÷ Molar mass
Given mass=41.4 g
Molar mass of C₂H₆0=46.07 g/mol
number of moles= 41.4 g ÷ 46.07 g/mol=0.89mol
Number of atoms =0.89mol×6.022×10²³ (Avogadro number)
=5.35×10²³ atoms
Therefore, the total number of atoms of hydrogen atoms in 41.4 g of
ethyl alcohol, C₂H₆0 is 5.35×10²³ atoms.
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9.81g of manganese(iv) oxide react with 6.54 g of aluminum to make 5.65g of aluminum oxide and an unknown mass of manganese determine the limiting reagent theorectical yield and percent yielf
Answer:
MnO₂ is limiting reactant
7.68g is theoretical yield
73.6% is percent yield
Explanation:
The reaction of the question is:
3MnO₂ + 4Al → 2Al₂O₃ + 3Mn
To determine limiting reactant we need to convert each reactant to moles and, based on the chemical equation determine the moles you need of the other reactant for a complete reaction:
Moles MnO₂ -Molar mass: 86.937g/mol-:
9.81g * (1mol / 86.937g) = 0.113 moles
Moles Al -Molar mass: 26.98g/mol-:
6.54g * (1mol / 26.98g) = 0.242 moles
For a complete reaction of 0.242 moles of Aluminium you will require:
0.242mol Al * (3MnO₂ / 4Al) = 0.182 moles of MnO₂
As there are just 0.113moles of MnO₂, MnO₂ is limiting reactant
Now, with limiting reactant we need to determine theoretical moles and grams of Al₂O₃ produced:
Moles:
0.113 moles MnO₂ * (2Al₂O₃ / 3MnO₂) = 0.0753 moles Al₂O₃
Grams (Molar mass: 101.96g/mol):
0.0753 moles Al₂O₃ * (101.96g/mol) = 7.68g is theoretical yield
Percent yield is 100 times the ratio between actual yield (5.65g) and theoretical yield:
5.65g/7.68g * 100 =
73.6%Compare Solution X to Solution A, Solution B, and Solution C. Beaker with a zoom view showing eight shperes, four groups of particles each consisting of two differently colored spheres. Beaker with a zoom view showing four spheres of a single color Beaker with a zoom view showing eight spheres of a single color Beaker with a zoom view showing eight shperes, two groups of particles each consisting of four spheres, three of one color and one of a different color. Which of the solutions have the same molar concentration as Solution X? C
Answer:
SOLUTION A
Explanation:
Molarity is one of the most common measure of concentration
The correct option that gives the solution that has the same molar concentration as solution X is the option;
Solution A
Reason:
The descriptions of the content or each beaker are;
Content of beaker X = Eight spheres of four groups of two differently colored spheres
Content of beaker with solution A = Four spheres of a single color
Content of beaker with solution B = Eight spheres of a single color
Content of beaker with solution C = Eight spheres in two groups of four having three spheres of one color and one sphere of a different color
The concentration of a solution given by the molarity is defined as the number of moles per liter of the solution
A mole is a quantity of matter that contains 6.023 × 10²² elementary particles
Considering each group of spheres as representing one mole of a substance, we have;
Beaker with solution X contains, Four moles containing two elements each, per volume of the solution, such as HClBeaker with solution A contains, four moles of a single (one) element compound per volume of the solutionBeaker with solution B contains, eight moles of a compound having one element eachBeaker with solution C contains, two moles having four elements each, three of one type and one of another element, such as CH₃Therefore, the solution that has the same molar concentration, (the same number of moles per volume of the solution) is solution A
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Which carries information by copying an original sound?
Answer:
frequency
Explanation:
i just did it
Answer:
A: analog signal
Explanation:
on edge2021!
ILL IBE BRAINLY Asian Tsunami 2004:
2. In decomposition, how are other parts of the ecosystem affected?
3. Under which type of change would more organisms be able to survive? Why?
4. What are some positive effects of a rapid change to an ecosystem?
5. What are some positive effects of a slow change to an ecosystem?
2.6
+
3.78
How do you solve this problem
Answer:
6.38
Explanation:
line up the decimals
it helps to add another 0 to 2.6 so that you can align them better
1
2.60
+ 3.78
= 6.38
8 + 0 = 8
6 + 7 = 13; write 3 and carry the one over above the 2 in 2.60
2 + 3 + 1 = 6
I tried my best to show it through text.
The principal quantum number for the outermost electrons in a Cl atom in the ground state is ________.
Answer:
The principal quantum number for the outermost electrons in a Cl atom in the ground state is 3.
Explanation:
By using the Pauling distribution the chlorine atom has an electronic set of [tex]3s1^{2}[/tex]
With n=3 for an orbital S, l = 0 , ml = 0 and ms = ± 1/2
Therefore the final answer is 3
Chemistry
H
D
G
A
S
F
F
F
G
Vv
F
F
F
F
F
Answer:
i think its f because my teacher have been talking about this
Explanation:
Answer:
f
Explanation:
