Answer:
Ununennium, also known as eka-francium or element 119, is the hypothetical chemical element with symbol Uue and atomic number 119. Ununennium and Uue are the temporary systematic IUPAC name and symbol respectively, which are used until the element is discovered, confirmed, and a permanent name is decided upon. In the periodic table of the elements, it is expected to be an s-block element, an alkali metal, and the first element in the eighth period. It is the lightest element that has not yet been synthesized.
Explanation:
Can the existence of isotopes explain the difference in properties between diamond and graphite?
Answer:yes
Explanation:
Both diamond and graphite are the allotropes of pure carbon (Carbon-12), they have different properties due to different types of arrangement of carbon atoms within their structures.
What is the difference in the properties between diamond and graphite?Diamonds have a strong three-dimensional network of carbon atoms while Graphites have a two-dimensional sheet-like structure. In a diamond, the network is formed because of the presence of covalent bonds between the carbon atoms. In graphite, bonds are generally due to weak Van der Waal's forces of attraction.
Therefore, diamonds are hard in nature while graphites are soft in nature. The molecules in diamonds are closely packed, as a result, they have high density. But in graphite, there is a large gap between molecules so they have low density.
As the diamonds have no presence of pi electrons they do not conduct electricity. But, there is the presence of pi electrons in graphite so they conduct electricity.
Therefore, the existence of isotopes does not explain the difference in properties between diamond and graphite
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The two types of alleles are... (select two) 1 recessive
2expressive
3 dominant
4 doughnut
Answer:
Recessive and Dominant
Explanation:
Answer:
4 doughnut
Explanation:
To measure the concentration of an aqueous solution of , an analytical chemist adds strong acid to a sample of the solution and titrates it to the endpoint with of potassium permanganate solution. The balanced chemical equation for the reaction is:
The question is incomplete, the complete question is shown in the image attached.
Answer:
7.69%
Explanation:
The balanced equation of this reaction is shown in the image attached to this answer.
The reaction is redox because we can notice a change in the oxidation number of species from left to right in the reaction equation.
For instance, the oxidation number of oxygen was changed from -1 in H2O2 to zero in O2. Hence H2O2 was oxidized.
To calculate the percentage of H2O2 in the sample;
number of moles of KMnO4 = 137 ml/1000 * 0.230 M = 0.03151 moles of KMnO4
From the reaction equation;
2 moles of permanganate reacts with 5 moles of H2O2
0.03151 moles of permanganate reacts with 0.03151 moles * 5/2 = 0.079 moles of H202
Mass of H2O2 reacted = 0.079 moles of H202 * 34 gmol-1 = 2.69 g
Hence % by mass of H2O2 in the sample = 2.69 g/35 g * 100 = 7.69%
Also known as motion energy
Answer:
kinetic energy
Explanation:
Answer:
kenetic energy is the one
will give brainliest
Answer:
Na2SO4 + Bi(NO3)3 = Bi2(SO4)3 + NaNO3
Cyclopropane rearranges to form propene in a reaction that follows first order kinetics. At 800 K, the specific rate constant for this reaction is 2.74 x 10 - 3 s - 1. Suppose we start with a cyclopropane concentration of 0.290 M. How long will it take for 99.0 % of the cyclopropane to disappear according to this reaction
Answer:
1866.4 secs
Explanation:
The integrated rate law for first order kinetics is given by;
[A] = [Ao] ^-kt
Where;
[A] = concentration of cyclopropane at time = t
[Ao] = initial concentration of cyclopropane
k = rate constant
t = time taken
From the question, we are told that 99% of cyclopropane disappeared hence;
[A] = 0.290 - (0.99 * 0.290)
[A] = 0.290 - 0.2871
[A] = 0.0029 M
Hence
0.0029 = 0.290 e^-2.74 x 10^ - 3 * t
0.0029/0.290 = e^-2.74 x 10^ - 3 * t
0.01 = e^-2.74 x 10^ - 3 * t
ln(0.01) = -2.74 x 10^ - 3 * t
-4.61 = -2.74 x 10^ - 3 * t
t= -4.61/-2.74 x 10^ - 3
t = 1866.4 secs
A ball is rolled at a velocity of 3 m/s and rolls for 5 seconds. How far does
the ball roll? *
Answer 15m
Explanation: Distance = Speed x Time
3 x 5 =15
GIVING BRAINLIEST FOR ANSWER!!! What type of bonding takes place between the two atoms?
Answer:
Its B
Explanation:
Answer:
I think the answer is polar covalent as there will be an unequal amount of electrons shared/available. An ionic bond will not take place because the valance shell of the larger atom contains more than 1 electron.
Whats the answer giving brainliest have a good day lol help
Answer: i would say north pole because the sunlight has to change directions to reach it if that makes since
Explanation: sorry if im wrong
How would I use the word evolution in a sentence?
What was the hiker's average velocity during part C of the hike?
10 km/min southwest
120 km/min west
0.13 km/min west
0.10 km/min north.
Answer:
0.13 km/min west
Explanation:
I just did the test.
Discuss between renewable and nonrenewable resources .Give an example for each.
Answer:
demos los
Explanation:
Answer: Renewable resources can be used again and again. Non-Renewable resources can be used once
Explanation: Sunlight, water, wind, are the renewable resources
Petrol, coal, natural gas are examples of non-renewable resources.
A small cylinder of helium gas used for filling balloons has a volume of 2.20 L and a pressure of 14300 kPa at 25 ∘C. Part A How many balloons can you fill if each one has a volume of 1.20 L and a pressure of 1.22 atm at 25 ∘C?
Answer:
You can fill 212 balloons.
Explanation:
First we calculate the helium moles in the small cylinder, using PV=nRT:
P = 14300 kPa ⇒ 14300 * 0.009869 = 141.13 atmV = 2.20 Ln = ?R = 0.082 atm·L·mol⁻¹·K⁻¹T = 25 °C ⇒ 25 + 273.16 = 298.16 K141.13 atm * 2.20 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 298.16 K
n = 12.70 molThen we calculate the number of moles that can fit in a single balloon:
1.22 atm * 1.20 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 298.16 Kn = 0.0599 molFinally we divide the total number of available moles by the number of moles in a single balloon:
12.70 mol / 0.0599 mol = 212.09So the answer is that you can fill 212 balloons.
What kind of ion forms when gallium (Ga) bonds with a non-metal
Answer:
Charged ion
Explanation:
2.Pressure is a force, what causes this force
Answer:
Pressure is a stress. It is a scalar given by the magnitude of the force per unit area. In a gas, it is the force per unit area exerted by the change of momentum of the molecules impinging on the surface. ... It is this force, acting on the surface of the solid, that we call the force due to pressure.
Explanation:
I hope this helps
Help please!
Describe Bohr’s model of the hydrogen atom
Explanation:
Bohr's model of the hydrogen atom is based on three postulates: (1) an electron moves around the nucleus in a circular orbit, (2) an electron's angular momentum in the orbit is quantized, and (3) the change in an electron's energy
Need help assap
Will give brainly
Answer:
C!
Explanation:
only C
A: solid B: liquid : C: GAS
Answer:
C.
Explanation:
Gas molecules are always spread far apart, and have room to move freely, so the answer is C.
List factors that make the bonding of carbon atoms unique.
Answer:
yessirrrrrrrrrrrrrr
Explanation:lets get ma boa
WILL GIVE BRAINLIEST TO ANSWER
Answer:
2.5 grams
Explanation:
you can see it on the graph
For the reaction, calculate how many grams of the product form when 2.8 g of Mg completely reacts.
Assume that there is more than enough of the other reactant.
2Mg(s)+O2(g)-->2MgO(s)
Answer:
4.64g MgO(s)
Explanation:
Given 2Mg(s) + O₂(g) => 2MgO(s)
2.8g excess (?)
=> 2.8g/24.31 g/mol
= 0.115 mol. Mg(s) => 0.115 mol. MgO(s)
grams MgO(s) produced = 40.31g/mol. x 0.115 mol. = 4.64g (Theoritical Yield)
What process is most likely to immediately follow the replication of DNA?
Question 5 options:
Mitosis
Translation
Replication
Transcription ****************
The process is replication
In the process of cell division and synthesis of new DNA, the stage after replication is called as transcription at which the DNA segments are copied into a RNA molecule.
What is transcription?Replication is the process of dividing the a DNA segment into two equivalent strands. After replication, these two strands will pair with their complementary RNA strands and the second stage is called transcription.
The process of transcribing a section of DNA into RNA is known as transcription. Messenger RNA is created when specific DNA sequences are translated into RNA molecules that can encode proteins (mRNA).
Non-coding RNAs are RNA molecules that contain copies of other DNA sequences (ncRNAs). The RNA is termed as messenger RNA (mRNA) if the stretch of DNA is translated into an RNA molecule that encodes a protein. The mRNA then acts as a template for the translation of the protein.
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describe the major advantages and disadvantages asexual and sexual reproduction
idk how to do this pls someone help me its on edge
Answer:
Ok so i know i'm late but i hope this helps anyone else that sees it.
(not a sample response)
Explanation:
Some of the advantages of Asexual Reproduction include the process requiring less energy and taking less time. Some of the disadvantages of Asexual Reproduction is that there is no variation in the DNA and there is more competition for resources.
Some of the advantages of Sexual Reproduction include variation in DNA and less competition for resources. The disadvantages of Sexual Reproduction include the process requiring more energy and the process being slower.
Answer:
Advantages of sexual reproduction
1. The new organism can have different variations of DNA
2. Can lead to a genetic variation of new offsprings and generations
Disadvantages
1.Takes more energy
2.Takes more time
Advantages of asexual reproduction
1. Takes less energy
2. Takes less time
3. Skips pollination and fertilization
Disadvantages
1.Can't lead to different genetic variations of offspring and generations.
2. DNA is the exact same
Explanation:
I got it right
4.A 100 L sample of gas is at a pressure of 80 kPa and a temperature of 200 K. What volume does the same
sample of gas occupy at STP?
Answer:
V₂ = 107.84 L
Explanation:
Given data:
Initial volume = 100 L
Initial pressure = 80 KPa (80/101 =0.79 atm)
Initial temperature = 200 K
Final temperature =273 K
Final volume = ?
Final pressure = 1 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 = P₁V₁T₂ /T₁P₂
V₂ = 0.79 atm × 100 L × 273 K / 200 K × 1 atm
V₂ =21567 atm.L.K /200 K.atm
V₂ = 107.84 L
Mercury may have ice trapped in the crater floors near the planet’s north pole.
a. True
b. False
Imagine you are a guest speaker for a kindergarten class and you have been asked to explain the chemical reaction occurring inside of a glow stick. What would you say
Answer:
Following are the solution to this question:
Explanation:
In this opinion, Tim Kane believed that its economy can not be badly affected by low manufacturing jobs in 1979, provided, in which an American industrial production had strong potential growth. Their view also opposes whatever Mr. Grove said of lower US employment particularly cos of increased production figures. Their opinion disputes as much as the American.
In Forbes, they wrote that All our industrial production is breaking records with increasing efficiency, despite a low number of industrial workers. Including Mr. grove, he favors beginning for small businesses. It was mainly due to the big advantage of smaller companies or the production of employment.
What is the mole ratio of ammonia (with a pKb of 4.75) to ammonium chloride in a buffer with a pH of 9.09
Answer:
0.692
Explanation:
To solve this problem we can use Henderson-Hasselbach's (H-H) equation:
pOH = pKb + log [tex](\frac{[NH_4Cl]}{[NH_3]})[/tex]In which pOH can be calculated from the pH:
pOH + pH = 14pOH = 14 - pH = 14 - 9.09pOH = 4.91Then we use the H-H equation to calculate[tex]\frac{[NH_4Cl]}{[NH_3]}[/tex]:
4.91 = 4.75 + log [tex](\frac{[NH_4Cl]}{[NH_3]})[/tex]0.16 = log [tex](\frac{[NH_4Cl]}{[NH_3]})[/tex][tex]10^{0.16}[/tex] = [tex]\frac{[NH_4Cl]}{[NH_3]}[/tex][tex]\frac{[NH_4Cl]}{[NH_3]}[/tex]= 1.44As the problem asks for the ratio of ammonia to ammonium chloride, we invert [tex]\frac{[NH_4Cl]}{[NH_3]}[/tex]:
[tex]\frac{[NH_3]}{[NH_4Cl]}=\frac{1}{1.44}[/tex] = 0.692The mole ratio of ammonia to ammonium chloride in a buffer with a pH of 9.09 is 0.692.
How we write Henderson Hasselbalch equation?Henderson Hasselbalch equation for the weak base (NH₃) and for their conjugate acid (NH₄Cl) will be written as:
pOH = pKb + log[NH₄Cl]/[NH₃], where
pKb = base dissociation constant = 4.75
pOH will be calculated from the given value of pH as:
pH + pOH = 14
pOH = 14 - 9.09 = 4.91
Now we these values in the above equation and we get,
4.91 = 4.75 + log[NH₄Cl]/[NH₃]
log[NH₄Cl]/[NH₃] = 0.16
[NH₄Cl]/[NH₃] = 10⁰°¹⁶
[NH₄Cl]/[NH₃] = 1.44
[NH₃]/[NH₄Cl] = 1/1.44
[NH₃]/[NH₄Cl] = 0.692
Hence, required mole ratio is 0.692.
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If the OH- concentration is 1 x 10^-2 , what is the ph
Answer:
the PH would be 12 the person was correct!
Explanation:
Which part of a seed plant develops into sperm cells? o embryo pollen 0 seed O xylem
Answer:
Pollen
Explanation:
bc i take notes and also my sister studies bio
PLZ GIMME BRAINLIEST
Answer:
correct
Explanation:
Which of the following situations best shows deposition?
Answer:
chemistry, deposition occurs when molecules settle out of a solution. Deposition can be viewed as a reverse process to dissolution or particle re-entrainment. It is a phase change from the gaseous state to a solid, without passing through the liquid state, also called re-sublimation.
Explanation:
Examples include beaches, deltas, glacial moraines, sand dunes and salt domes. In severely cold temperatures frost will form on windows because the water vapor in the air comes into contact with a window and immediately forms ice without ever forming liquid water.
Which group below correctly list bases that completely dissociate in water
Explanation:
Where's the question?
