Answer:
B. 7 protons, 10 electrons
Explanation:
hope this helps :)
swel
What is a mixture?
Answer:a substance made by mixing other substances together.
Explanation:trust me
If the OH- concentration is 1 x 10^-2 , what is the ph
Answer:
the PH would be 12 the person was correct!
Explanation:
will give brainliest
Answer:
Na2SO4 + Bi(NO3)3 = Bi2(SO4)3 + NaNO3
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.
A solution of HCl with a volume of 25.00 mL is titrated to the endpoint, with 0.250 M
NaOH. If it takes 34.56 mL of NaOH, what is the original concentration of HCl in the
solution?
HCl(aq) + NaOH(aq) → H20(l)+ NaCl(aq)
Answer:
[tex]0.3456\ \text{M}[/tex]
Explanation:
[tex]V_1[/tex] = Volume of NaOH = 34.56 mL
[tex]V_2[/tex] = Volume of HCl = 25 mL
[tex]M_1[/tex] = Concentration of NaOH = 0.25 M
[tex]M_2[/tex] = Concentration of HCl
When endpoint is reached the number of moles of NaOH will be equal to the number of moles of HCl
[tex]M_1V_1=M_2V_2\\\Rightarrow M_2=\dfrac{M_1V_1}{V_2}\\\Rightarrow M_2=\dfrac{0.25\times 34.56}{25}\\\Rightarrow M_2=0.3456\ \text{M}[/tex]
Concentration of HCl is [tex]0.3456\ \text{M}[/tex].
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.
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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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
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
NEED HELP HAVE TO TURN IN IN 5 MIN
The two types of alleles are... (select two) 1 recessive
2expressive
3 dominant
4 doughnut
Answer:
Recessive and Dominant
Explanation:
Answer:
4 doughnut
Explanation:
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)
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.
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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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:
The moon is 260,000 miles away. How many feet is it from earth?
Answer:
1,372,800,000 Feet
Explanation:
1 Mile = 5280 Feet
260,000 Miles = 5280 × 260,000 Feet
260,000 Miles = 1,372,800,000 Feet
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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Which of the following does NOT describe elements? can join together to form compounds all the particles are alike can be broken down into simpler substances have unique sets of properties
Answer:
Can be broken down into simpler substances.
Explanation:
Elements are made of atoms, and that is the simplest understood unit of the universe. :) nOw GiB mY 50000 points.
Answer:
Can be broken down into simpler substances
Explanation:
Because atoms cannot be created or destroyed in a chemical reaction
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.
Mercury may have ice trapped in the crater floors near the planet’s north pole.
a. True
b. False
Which group below correctly list bases that completely dissociate in water
Explanation:
Where's the question?
What is the electron configuration of an isolated Cl atom? Express your answer in condensed form in order of increasing orbital energy as a string without blank space between orbitals. For example, [He]2s22p2 should be entered as [He]2s^22p^2.
Answer: [tex][Ne]3s^23p^5[/tex]
Explanation:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.
The electrons are filled according to Afbau's rule in order of increasing energies . Chlorine atom has 17 atomic number of 17 and has 17 electrons. The nearest noble gas is Neon with 10 electrons and thus the electronic configuration in terms of noble gas is:
[tex]Cl:17:[Ne]3s^23p^5[/tex]
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.
WILL GIVE BRAINLIEST TO ANSWER
Answer:
2.5 grams
Explanation:
you can see it on the graph
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.
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.
What is the mass of 16.6 x 1023 molecules of barium nitrate?
a 721 grams
b 2541 grams
C 927 grams
d 4338 grams
Answer: 721 grams
Explanation:
The mass of 16.6 x 10²³ molecules of barium nitrate is 721 grams.
HOW TO CALCULATE MASS:The no of moles of a substance can be calculated by dividing the number of molecules in the substance by Avogadro's number. That is;Moles of substance = no. of molecules ÷ 6.02 × 10²³
no. of moles = 16.6 x 10²³ ÷ 6.02 × 10²³
no. of moles = 2.76moles
Molar mass of Ba(NO3)2 = 261.34 g/mol
Mass of barium nitrate = 261.34 × 2.76
Mass of barium nitrate = 721g
Therefore, the mass of 16.6 x 10²³ molecules of barium nitrate is 721 grams.
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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%
List factors that make the bonding of carbon atoms unique.
Answer:
yessirrrrrrrrrrrrrr
Explanation:lets get ma boa
How many moles of solute are present in a solution of 0.165 L of 0.39 M NaNO3?
Answer:
00.8755521
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
