Answer:
The first ionization energy varies in a predictable way across the periodic table. The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.
Explanation:
The 2-methylcyclohexanol used in this experiment is a mixture of cis and trans isomers, approximately in 1:1 ratio. Which kind of mechanism can better account for the product mixture obtained from the dehydration of cis and trans-2-methylcyclohexanol mixture: E1, E2, or a combination of the two
Answer:
E1
Explanation:
A detailed mechanism of the reaction is shown in the image attached obtained from UCSB.
We can see from the mechanism that the reaction occurs via a carbocation intermediate. The transition state involves a carbcation and this is only typical of an E1 mechanism.
Furthermore, there is a 1,2-hydride shift which leads to the formation of the more stable tertiary carbocation. The products clearly indicate a rearrangement and points towards an ionic mechanism in operation.
In a chemical reaction is a new substance obtained? Explain your answer
The electron configuration for Helium (He) is shown below.
152
Which diagram shows the correct distribution of electrons in the electron shells of a helium atom?
1P
ON
2 electrons in the atomic shell
Further explanationHelium belongs to the noble gas group (group 18), s block and period 1
Electron configuration: 1s²
Symbol: ₂He⁴
With atomic number 2 and mass number 4, the composition of the subatomic particles is:
2 protons, 2 electrons, and 2 neutrons
2 protons and 2 neutrons make up the atomic nucleus while 2 electrons are in the atomic shell
does foil keep in the heat well ?
Answer:
Explanation:
yes
Answer:
yes
Explanation:
it acts as a barrier to oxygen and can transfer heat
write a balanced equation for the reaction of awueous lead (II) nitrate and potassium chromate g
Answer:
Pb(NO3)2 + K2CrO4 → PbCrO4 + 2KNO3
Explanation:
Chemical substances engages in reactions to form certain products. The reacting compounds or molecules are called reactants. According to this question, aqueous lead (II) nitrate and potassium chromate, which are both chemical compounds react together.
lead (II) nitrate has a chemical formula of Pb(NO3)2 while pottasium chromate has a chemical formula of K2CrO4. The equation and their products are as follows:
Pb(NO3)2 + K2CrO4 → PbCrO4 + KNO3
The products are KNO3 (pottasium nitrate) and PbCrO4 (lead (II) chromate).
Balancing this chemical equation, we make use of coefficients as follows:
Pb(NO3)2 + K2CrO4 → PbCrO4 + 2KNO3
How does the law of conversation of mass apply to this reaction: C2H4+O2>H2O+CO2?
Answer:
There are fewer oxygen atoms in the equation than hydrogen or carbon.
Explanation:
PLATO
What does this image represent? (5 points)
-Formation of ionic bonds in water
-Formation of covalent bonds in water
-Transfer of valence electrons from oxygen to hydrogen
-Sharing of valence electrons between two hydrogen atoms
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option B that is formation of covalent bonds in water.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
The given image represents the formation of covalent bonds in water. Water is a covalent compound having covalent bond between oxygen and hydrogen.
Therefore, the correct option is option B that is formation of covalent bonds in water.
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There is a dual equilibrium between the indicator methyl orange (Hln/In-) and acetic acid HC2H3O2(aq) and acetate NaC2H3O2. The acetic acid/sodium acetate equilibrium is:
HC2H3O2(aq)+ H2O(l) ⇌ C2H3O- (aq) + H3O+(aq)
a. How will the addition of acid (H3O+) affect this equilibrium? Explain in words how this changes the concentration of any reactants or products and then draw an arrow to show if the equilibrium shifts to the right or left.
b. How will the addition of sodium acetate NaC,H,O2 (aq) affect this equilibrium? Explain in words how this changes the concentration of any reactants or products and then draw an arrow to show if the equilibrium shifts to the right or left.
Answer:
a. Equilibrium shifts to the left.
b. Equilibrium shifts to the left.
Explanation:
Hello.
a. In this case, considering the Le Chatelier's principle which states that the addition of any product shifts the reaction towards the reactants in order to reestablish equilibrium, by the addition of H₃O⁺ we are adding a product, it means that the equilibriums shifts to the left.
b. In this case, since the addition of sodium acetate releases sodium ions and acetate ions, because it is totally ionized, such released acetate ions have the capacity to shift the equilibrium to left as it is a product as well as the H₃O⁺, therefore, adding sodium acetate shifts the equilibrium to the left, by also considering the Le Chatelier's principle.
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A compound, XY3, forms between 1 atom of element X and 3 atoms of element Y. If element X has 5 valence electrons and element Y has 7 valence electrons, what shape will it have?
4. Students sometimes find it necessary to conduct a 2nd, a 3rd and even a 4th weighing of the crucible at the end of the experiment. Which of these masses should be utilized to calculate the percentage of NaHCO3
Answer:
4th
Explanation:
The result of the last weighing of the crucible should be utilized when students want to calculate the percentage of NaHCO3.
This is the best option to take because it is important that the mass of the NaHCO3 remain consistent throughout the calculations so that there will be a very high degree of accuracy in the result obtained.
(7.12F) Which of the following statement(s) is part of the cell theory?*
O A A cell is the smallest unit of life in living organisms
O B All living things are made of cells
O C All cells come from pre-existing cells
O D All of the above
1. What surface would reflect light the best?
Answer:
Glass mirror
Explanation:
To convert from one resonance structure to another, ________. To convert from one resonance structure to another, ________. only electrons can be moved electrons must be added only atoms can be moved electrons and atoms can both be moved neither electrons nor atoms can be moved
Answer:
To convert from one resonance structure to another, only electrons can be moved
Explanation:
The resonance structure is known as the molecular bonding system in which a hybrid, called resonance, is formed from two or more Lewis structures that have different electronic distributions. The degree of similarity and the number of resonant structures measure the stability of the compound in which it occurs.
In organic compounds, there are cases in which, from the formula recorded as a function of the Lewis structures, it is impossible to determine with precision the exact structure of a molecule. Thus, in a nitrile chloride molecule, there exist two alternative structures distinguished only based on the positions of its electrons, but not on those of its atoms.
What is the reaction of HC2H3O2 and NaOH.
Answer:
NaOH + HC2H3O2 → NaC2H3O2 + H2O
The light from the Sun heats a metal surface. This is an example of
A.
conduction.
B.
radiation.
C.
reflection.
D.
convection.
Answer:
radiation.
Explanation:
Radiation is a method of energy transfer in which energy can transfer through matter or through empty space. In this example, solar energy travels through empty space from the Sun, through the Earth's atmosphere, and to the metal surface. The metal surface absorbs some of the energy, which causes the surface to heat up.
WHERE can you find the formula for density?
Answer:
The formula for density is mass divided by volume
Explanation:
hope this helps!!!
The table below lists the isotope mass and isotope percent abundance of the element that is used in the production of stainless steel.
Isotope Mass % Abundance
53.938882 2.365
52.940651 9.500
51.940509 83.790
49.946046 4.345
Based on the information in this table, which element is used in the production of stainless steel?
A.
Fe
B.
Cr
C.
C
D.
Ni
Answer:
the answer is cr
Explanation:
just did this test in chemistry the answe cr as in chromium, xoxo live stream positions by ariana btw
When light bends or changes direction, what is happening? A interaction B movement C reflection D refraction
Answer:
D) Refraction
Explanation:
Refraction is when something is bended or when it changes directions, such as light
The light bends or changes direction when it's being refracted. So the correct option is D.
What is refraction?
The bending of a light ray when it's passing from one medium to another medium is called refraction. The bending of the ray is due to the differences in density between the two media.
The change in the direction of a wave when it's passing from one medium to another is defined as refraction. This is one of the most commonly observed phenomena in nature. The working of optical instruments like magnifying glasses, lenses, and prisms is possible due to refraction.
Also, because of the refraction of light, a person can focus light on their retina and is thus able to see. Whenever a light ray travels at an angle into a medium of different refractive indices, it always refracts. This is a change in speed which results in a change in direction.
There are two laws of refraction. They state that:
"The incident ray refracted ray, and the normal to the interface of two media at the point of incidence all lie on the same plane." "The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant. This is also known as Snell’s law of refraction."[tex]\frac{sin (i)}{ sin (r)} = constant[/tex]
Therefore the correct option is D.
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we want to prepare an acetate buffer of pH 6.420 from a 0.664 M acetic acid solution pKa =4.752 and a 2.50 M KOH solution. If we have 975 ml of the acetic acid solution, how many milliliters of the KOH solution do we need to add to make a buffer of pH 6.42?
Answer:
253.5mL must be added
Explanation:
To find pH of a buffer we need to use H-H equation:
pH = pKa + log [Acetate] / [Acetic acid]
Where pH is pH we want: 6.42; pKa is 4.752 and [] could be taken as moles of each species.
6.42 = 4.752 + log [Acetate] / [Acetic acid]
1.668 = log [Acetate] / [Acetic acid]
46.5586 = [Acetate] / [Acetic acid] (1)
And moles of acetate buffer = Initial moles of acetic acid are:
975mL = 0.975L * (0.664mol / L) = 0.6474 moles acetate buffer =
0.6474 = [Acetate] + [Acetic acid] (2)
Replacing (2) in (1):
46.5586 = 0.6474 - [Acetic Acid] / [Acetic acid]
46.5586 [Acetic acid] = 0.6474 - [Acetic Acid]
47.5586 [Acetic acid] = 0.6474
[Acetic acid] = 0.01361 moles
And [Acetate]: 0.6474 - 0.01361moles
[Acetate] = 0.63379moles
Now, in the beginning we have just Acetic acid that is converted in acetate with the use of KOH:
Acetic acid + KOH → Acetate
That means the moles of KOH added are the moles of acetate we need. That means we need to add 0.63379 moles of KOH that comes from a 2.50M. The volume is:
0.63379 moles KOH * (1L / 2.50 moles) = 0.2535L =
253.5mL must be addedQuestion 3
1 pts
What is the molar mass of C13H21N03 (albuterol), a drug used to treat asthma?
Reminder: molar mass is always 4 numbers
g/mol
what year did Robert Milliken discover the electron charge?
Answer: 1909
Explanation: In 1909 Millikan began a series of experiments to determine the electric charge carried by a single electron.
Answer: 1909
Explanation:
If an acyclic alkane hydrocarbon contains n carbon atoms, how many hydrogen atoms must it also contain
Answer: The answer is 2n+2
Explanation:
the general formula for defining an Alkane is [tex]CnH2n+2[/tex]
Hence for each n carbon there will be 2n+2 hydrogens present in the hydrocarbon.
What is the predicted oxidation number for a Sulfur ion?
-3
-2
-1
+1
+2
+3
I believe it is -2, though I might be wrong.
12. Enzymes are produced as a direct result of
which process?
1) protein synthesis
2) photosynthesis
3) respiration
4) enzymatic hydrolysis
Answer:
it is 3or4
Explanation:
and you know all you gotta d is search the test on quizzie and you can get all the answers btw
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Enzymes are produced as a direct result of a process termed; Protein synthesis.
By definition; Enzymes are specific in their action.
Enzymes are proteinous in nature and they have active sites.
It is on this basis that enzymes are inactive when they are denatured as they can no longer fit into their active sites.
Enzymes therefore are produced as a direct result of protein synthesis.
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An element that is usually a gas or brittle solid at room temperature, that is not ductile or malleable. Also it doesn’t conduct heat or electricity well.
A. Lithium
B. Arsenic
C. Nitrogen
D. Cobalt
An aqueous solution contains dissolved and . The concentration of is 0.50 M and pH is 4.20. Calculate the concentration of in this buffer solution.
Here is the correct format for the question.
An aqueous solution contains dissolved [tex]\mathbf{C_6H_5NH_3Cl}}[/tex] and [tex]\mathbf{C_6H_5NH_2}[/tex]. The concentration of [tex]\mathbf{C_6H_5NH_2}[/tex] is 0.50 M and pH is 4.20. Calculate the concentration of [tex]\mathbf{C_6H_5NH_3^+}[/tex] in this buffer solution. [tex]\mathbf{K_b = 3.8 \times 10^{-10}}[/tex]
Answer:
[tex]\mathbf{C_6H_5NH_3^+ = 1.1995 M }[/tex]
Explanation:
From the above information:
[tex]pKb \ of \ C _6H_5NH_2 = -log(3.8 \times 10^{-10})[/tex]
[tex]pKb \ of \ C _6H_5NH_2 = 9.42[/tex]
pH = 4.20
pOH = 14 - pH
pOH = 14 - 4.20 = 9.8
According to Henderson Hasselbalch equation
[tex]pOH = pKb + log \dfrac{[C_6H_5NH_3^+]}{[C_6H_5NH_2]}[/tex]
[tex]9.8 = 9.42 + log \dfrac{[C_6H_5NH_3^+]}{(0.50)}[/tex]
[tex]9.8-9.42 = log \dfrac{[C_6H_5NH_3^+]}{(0.50)}[/tex]
[tex]0.38 = log \dfrac{[C_6H_5NH_3^+]}{(0.50)}[/tex]
[tex]10^{0.38} = \dfrac{[C_6H_5NH_3^+]}{(0.50)}[/tex]
[tex]2.399 = \dfrac{[C_6H_5NH_3^+]}{(0.50)}[/tex]
[tex]C_6H_5NH_3^+ = 2.399 \times(0.50)[/tex]
[tex]\mathbf{C_6H_5NH_3^+ = 1.1995 M }[/tex]
The reaction rate is the blank with which reactant turn into Products
Answer:
the answer should be speed)
Explanation:
hope it helps like the pic by the way
3. The Protons in the nucleus has relevative
Charge of________
the electrons has relativie
charge of_____
Answer: The Protons in the nucleus has relevative charge of positive.
The electrons has relativie charge of negative.
Explanation: SCIENCE!
What are two important characteristics of the silica gel and alumina that are used for column chromatography
Answer:
Two important characteristics of the silica gel and alumina that are used for column chromatography-:
Uniform particle sizeHigh specific areaExplanation:
The adsorbent must be thinly split in column chromatography to provide a well packed column that serves as a stationary step.
The silica gel and alumina qualities that render them appropriate as column chromatography adsorbents are-:
Have a uniform particle size that guarantees uniform column packaging. A highly specific area in which a rapid balance is formed between the mobile phase and the stationary phase.An atom of aluminum loses how many electrons when it forms ionic bonds with three atoms of fluorine?
A. 1
B. 2
C. 3
D. 4