Answer:
D. both use a strong, non-nucleophilic base such as LDA and use a low temperature.
Explanation:
The more stable enolate is the thermodynamic enolate, and a less stable is known as the kinetic enolate.
The less stable enolate has a less substituted product, while the more stable product has a more substituted product.
Now, to form a kinetic enolate, we need to choose a strong, non-nucleophilic base such as LDA to attract hydrogen from the less substituted site. However, an increase in temperature results in an increase in a reaction, which leads to the formation of a stable product.
So, to form the kinetic enolate, a low temperature will be required.
Thus, To form a kinetic enolate, both use a strong, non-nucleophilic base such as LDA and use a low temperature.
Which color of light has the greatest energy
Answer:
violet
Explanation:
Waves with a short wavelength have the most energy. Red waves have a relatively long wavelength (in the 700 nm range), and violet waves are much shorter - roughly half that. Because violet waves have the shortest wavelength of the visible light spectrum, they carry the most energy (google)
Much like a battery, wood contains stored energy. What energy transformations occur when wood is burned?
Answer:
Chemical
Explanation:
Please help asap. I’ll give brainliest
Answer:
A. Metal mixture is impure
1) Aluminum hydroxide, Al(OH)3, is amphoteric. What does this mean?
Explanation:
Aluminium hydroxide is amphoteric. Because it reacts with both acids and bases. Like any conventional base, the OH radical in Al(OH)3 neutralizes H+ to make water and an aluminium salt. Al(OH)3 solid will also react with excess OH– to dissolve and form the complex ion [Al(OH)4]−.
Answer:
Answer: Aluminium hydroxide ,AI(OH)3,is found in nature as the mineral gribbsite (also know as hydrargillite) and its three much rarer poly morphs
Explanation:
yan lang po ang alam ko
Does water have mass? Yes or no. Thanks everyone for your help
Answer: The density of a material is defined as its mass per unit volume. In this example, each volume of water is different and therefore has a specific and unique mass. The mass of water is expressed in grams (g) or kilograms (kg), and the volume is measured in liters (L), cubic centimeters (cm3), or milliliters (mL).
Explanation: HOPE IT HELPS :)
Sugar solution and steel are both mixtures. Which statement correctly compares them?
A) Both sugar solution and steel are separable mixtures.
B) Both sugar solution and steel are inseparable mixtures.
C) Sugar solution is a separable mixture but steel is an inseparable mixture.
D) Sugar solution is an inseparable mixture but steel is a separable mixture.
The mercury level in the open arm of an open-end manometer is 106 mm above the level in the arm connected to a tank of gas. If the barometric pressure is 0.958 atm, what is the pressure (in torr) of the gas in the tank?
Answer:
[tex]833.72\ \text{torr}[/tex]
Explanation:
[tex]P_g[/tex] = Pressure of gas = [tex]106\ \text{mmHg}[/tex]
[tex]P_a[/tex] = Atmospheric pressure = 0.958 atm
Absolute pressure is given by
[tex]P=P_g+P_a[/tex]
[tex]\Rightarrow P=\dfrac{106}{760}+0.958[/tex]
[tex]\Rightarrow P=1.097\ \text{atm}=1.097\times 760=833.72\ \text{torr}[/tex]
The pressure of the gas in the tank is [tex]833.72\ \text{torr}[/tex]
Answer the questions below:
1.Give an example of something that has matter.
2.Give an example of something that doesn't have matter.
3.What is the difference between an chemical change and a physical change?
4.What 2 main kind of changes can you observe involve chemical reactions?
5.What is a precipitate?
6.What is the difference between an endothermic reaction and an exothermic reaction?
Answer:
1. some thing that has matter is an apple, a person,a table. things that does 2.not Light.,Sound.,Heat.Energy.Gravity.Time.A Rainbow.Love.
3. Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
4.A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change. Absolute confirmation of a chemical change can only be validated by chemical analysis of the products!
5.Precipitate: In chemistry, a solid formed by a change in a solution, often due to a chemical reaction or change in temperature that decreases solubility of a solid. In meteorology a precipitate is liquid or solid water (rain, snow, etc.) falling from the sky.
6.n simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system.
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Explanation:
What is the name of the waxy coating that keeps plants from drying out? chloroplast cuticle phloem xylem
Answer:
cuticle
Explanation:
Hope this help :)
Answer:
B(cuticle)
Explanation:
Calculate the mass of a sample of lead (cPb = 0.16 J/g℃) when it loses 200 J cooling from 75.0℃ to 42.0℃.
The single invention of the ______ has advanced what we know about the universe more than any other scientific technology.
Answer the questions below:
1.Give an example of something that has matter.
2.Give an example of something that doesn't have matter.
3.What is the difference between an chemical change and a physical change?
4.What 2 main kind of changes can you observe involve chemical reactions?
5.What is a precipitate?
6.What is the difference between an endothermic reaction and an exothermic reaction?
Answer:
1. An apple is something that has matter.
2. Light does not have matter. It neither has mass or takes up and space.
3. Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
4. A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change. Absolute confirmation of a chemical change can only be validated by chemical analysis of the products!
5. A precipitate is a solid that forms out of solution.
6. In simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system.
Explanation:
Matter is anything that has mass and takes up volume.
Answer:
1. some thing that has matter is an apple, a person,a table. things that does 2.not Light.,Sound.,Heat.Energy.Gravity.Time.A Rainbow.Love.
3. Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
4.A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change. Absolute confirmation of a chemical change can only be validated by chemical analysis of the products!
5.Precipitate: In chemistry, a solid formed by a change in a solution, often due to a chemical reaction or change in temperature that decreases solubility of a solid. In meteorology a precipitate is liquid or solid water (rain, snow, etc.) falling from the sky.
6.n simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system.
hope this help plz give me a thxs and brainlyest and a five star thx and you welcome let me know if this helped
For each of the following statements, determine if the trend will increase or decrease. As you move from left to right across the periodic table, the size of atomic radii .
Answer:
I just did the assignment it's "decreases"
Explanation:
If you guys came from Ed-genuity (i'm writing it like that because apperantly that is a swear word?) That means the next questions are "As you move from left to right across the periodic table, electronegativity..." and "As you move from top to bottom within a group, the first ionization energy...".
for electronegativity, it's increases and for ionization energy it's decreases. Hope this helps!
Answer:
1. Decreases
2. Increases
3. Decreases
What is the density of a lego block that has 4 cm length, 2 cm width, 4.5 cm height, Mass 18 g.
Answer:
density is [tex]\frac{mass}{volume}[/tex]
Explanation:
the volume of the block is 4 x 2 x 4.5 and that equals 36. Divide the mass by the volume and you get [tex]\frac{18}{36}[/tex] which is equal to 2 g per cubic centimeters
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A scientist finds that a sample of matter contains three types of atoms. The sample can be any of the following, except:
A. compound
B. molecule
C. element
D. mixture
Answer:
The correct answer is C. element
Explanation:
The sample cannot be an element because an element - or elemental substance - cannot be decomposed into simpler substances. Thus, it cannot be composed by differents types of atoms. For example, an element is carbon (C).
As the sample contains three types of atoms, it can be a compound, a molecule or a mixture, because they can be composed by different types of atoms - of different chemical elements. For example, the sample could contain the element carbon (C) combined with other elements, for example oxygen (O) or hydrogen (H), amoing others.
The sample can not be an element due to having only one type of atom.
The sample can be mixture, compound and molecule except element because element is formed from only one type of atoms which can not be broken down into simpler one. The sample contains three types of atoms which means it may be mixture, compound or molecule.
The reason behind this is that mixture, compound and molecule can be made up of three atoms whereas the element can't so we can conclude that sample can not be an element.
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Which of the substances below would dissociate into ions when dissolved in water? Select all that apply.
A. AgCl
B. NaBr
C. Pb(OH)2
D. KOH
Answer:
B. NaBr
D. KOH
Explanation:
Below is the solubility rules given for you knowledge.
Salts of
Group 1 elements are soluble([tex]Li^+, Na^+, K^+,Cs^+, Rb^+[/tex])Ammonium ion is soluble ([tex]NH4^+[/tex])The nitrate are generally soluble( [tex]NO3^-)[/tex]of Cl- , Br- , and I- are soluble, except Ag+ , Pb+2, and (Hg2)+2most sulfate are soluble, except Ba+2, Ca+2,Pb+2, Ag+, Sr+2.most hydroxide salts are only slightly soluble, except NH+4, Li+, Na+, K+Most carbonates are insoluble (CO3 2-) Except group 1 and NH+4most phosphate are insoluble except group 1 and NH+4so using the rules above
NaBr , KOH are soluble, Pb(OH)2 is slightly soluble and AgCl is not soluble.
Answer:hope this helps had to guess these are the correct answers =)
What do you think the study of chemistry might be about? I need a sentence, thanks everyone for your help
Answer:
The study of chemistry is about the learning of chemist arts
help asap ..
using the stock name method when naming a translation metal ion that can have more than one common ionic charge, the numerical value of the charge is indicated by a ____ .
a: arabic number following the name .
b: superscript after the name .
c: roman numeral following the name .
d: prefix .
What is the frequency of a photon whose energy is 3.4 x 10-19 )? (h = 6.626 x 10-34 Js)
Answer:
Frequency of photon is 0.513×10¹⁵ s⁻¹
Explanation:
Given data:
Energy of photon = 3.4×10⁻¹⁹ J
Frequency of photon = ?
Planck's constant = 6.63 × 10⁻³⁴ Js
Solution:
Formula:
E = hf
3.4×10⁻¹⁹ J = 6.626 × 10⁻³⁴ Js × f
f = 3.4×10⁻¹⁹ J / 6.626 × 10⁻³⁴ Js
F = 0.513×10¹⁵ s⁻¹
Frequency of photon is 0.513×10¹⁵ s⁻¹.
The half-life of protactinium-217 is 4.9 x 10-3s. How much of a 3.50 mg sample of 21791 Pa will remain after 1.00 second?
Answer:
.
Explanation:
Which action is a change in state
a. dissolving
b. tearing
c. stretching
d. condensing
Answer: condensing
Explanation:
Answer:
C
Explanation:
When an oceanic plate and a continental plate collide, which one will subduct?
1. Oceanic
2.Continental
3.Both
4.Neither one
When an oceanic plate and a continental plate collide, both will subduct. Therefore, option 3 is correct.
What is an oceanic plate ?Oceanic plates are plates found beneath the ocean. As previously stated, oceanic plates are denser than continental plates. This is due to the fact that they are made of denser rocks. Basalt is the most common material found in oceanic plates.
When compared to continental crust, oceanic crust formed at spreading ridges is relatively homogeneous in thickness and composition.
Because oceanic crust is naturally denser, when an oceanic plate converges with a continental plate, the oceanic crust will always subduct beneath the continental crust. Convergent boundaries are frequently linked to larger earthquakes and increased volcanic activity.
Thus, option 3 is correct.
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B. Lex Luthor has a piece of kryptonite that measures W=3.0 cm by L=6.0 cm by
H=4.0 cm has a mass of 80.0 grams. What is the density of the kryptonite?
Would the piece of that float in water? Why?
(volume = L x W x H) (water density = 1g/cm3)
Answer:
1.11g/cm³
It will sink
Explanation:
Given parameters:
Dimension of the kryptonite:
W = 3cm
L = 6.0cm
H = 4.0cm
Mass = 80g
Unknown:
Density of the kryptonite = ?
Solution:
The density of a substance is its mass per unit volume;
Density = [tex]\frac{mass}{volume}[/tex]
Now let us find the volume;
Volume = L x W x H = 3 x 6 x 4 = 72cm³
So;
Density = [tex]\frac{80}{72}[/tex] = 1.11g/cm³
The substance will not float in water because its density is greater than that of water. It will sink in water.
What are the similarities and differences between unicellular and multicellular organisms?
Answer:
Unicellular organisms contain one cell and all of their functions are based on that one cell whereas multicellular organisms contain more than one cell and their functions are divided amongst different cells like nervous cells, cardiac muscle cells etc.
Explanation:
While multicellular creatures have numerous cells, unicellular organisms only have one.
What are unicellular organisms?A single cell makes up a unicellular creature, also referred to as a single-celled organism, as opposed to a multicellular organism, which is made up of numerous cells.
Prokaryotic and eukaryotic organisms are the two broad categories into which all organisms fall.
Unicellular organisms only have one cell, whereas multicellular species have many. While multicellular creatures carry out various cell functions through a clearly defined set of cells, unicellular organisms combine all cellular functions into one cell.
Multicellular and unicellular organisms are comparable in that they exhibit nearly all of the life's processes and functions, including metabolism and reproduction.
They have RNA and DNA, which can show a variety of lifestyles vital to the majority of the ecosystem in which we currently live.
Thus, these are some similarities and differences between unicellular and multicellular organisms.
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Please help with chemistry homework (I’ll mark brainliest!)
Answer:
You answer is correct
Electrons have a negative charge. The charge on the proton and electron are exactly the same size but opposite. Neutrons have no charge.
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what is the Mr of MgCI2
Molar mass of MgCl₂ : 95 g/mol
Further explanationAn atomic mass unit ( amu or "u") is a relative atomic mass of 1/12 the mass of an atom of carbon-12.
The molar mass(molecular mass-formula mass) of a compound is the sum of the relative atomic mass (Ar) of the constituent elements of the compound
Can be formulated :
M AxBy = (x.Ar A + y. Ar B)
Compound MgCl₂
[tex]\tt M=Ar~Mg+2.Ar~Cl\\\\M=24+2.35.5\\\\M=24+71\\\\M=95~g/mol[/tex]
An experiment requires that enough C3H8O be used to yield of oxygen .
How much C3H8O must be weighed out?
Answer: So if you had 570 cm of ribbon, then 570%2F8.5=67.05 which means that about 67 students can do the experiment (round down to the nearest whole number).
Explanation: If you had 8.5 cm of ribbon, then only 8.5%2F8.5=1 student can do the experiment. If you had 17 cm of ribbon, then 17%2F8.5=2 students can do the experiment.
Which sugary delight are we looking for
20 POINTS
TREAT
SINIO OOS
20 POINTS
500 POINTS
FRUIT
Answer:
I’m very confused can you clerify that?
Explanation:
Answer:my bit,cu,mghg
Explanation:
What is the density of an aqueous solution that is 50.0% KOH by mass and has a KOH concentration of 13.39 M?
Answer:
Density = 1.56 g/mL
Explanation:
We have two sort of concentrations in here, so let's combine them.
% by mass means grams of solute in 100 g of solution
M means, moles of solute in 1L of solution.
We know that our solute is KOH (Molar mass = 56.1 g/mol)
We convert the moles of solute to grams:
56.1 g/mol . 13.9 moles = 779.79 g
Now, we know that 50 g of solute are in 100 g of solution
Then, 779.79 g of solute will be contained in (100 . 779.79)/50 = 1559.58 g of solution
Density = mass / volume
1559.58 g of solution / 1000 mL of solution = 1.56 g/mL
Use the given half reactions to "construct" an electrolytic cell. Zn^2+ + 2 e^--------->Zn E°cell = -0.76 V Cu^2+ + 2 e^---------> Cu E°cell = 0.34 V 1. Predict the standard potential of the cell at 298 K. 2. What is the minimum voltage that should be applied to the standard electrolytic cell found in question to cause zn2+ to be reduced to Zn?
Answer:
See explanation and image attached
Explanation:
The standard cell potential at 298 K is given by;
E°cathode - E°anode
Hence;
E°cell = 0.34 V - (-0.76 V)
E°cell = 0.34 V + 0.76 V
E°cell = 1.1 V
To reduce Zn^2+ to Zn then Zn must be the cathode, hence;
E°cell = (-0.76 V) - 0.34 V
E°cell = -1.1 V
