Answer:
It is D. a second set of chromosomes is produced
Explanation:
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Balancing the equation in the pic
2.83 kJ are added to a sample of water at 100°C and it completely vaporizes. What is the
mass of the water?
general formula
Answer:
general formula: Q=mHv, 2.83=m(2260), 2260/1000=2.26 , 2.83/2.26=1.25 kJ
Explanation:
Conner conducts the following experiment. He places a bell in a vacuum jar. During his first trial, he leaves the bell outside the jar. He sees the bell vibrating and he hears the bell ringing. During his second trial, he removes the air from the vacuum jar. He sees the bell vibrating but he does not hear the abell ringing. What does this experiment tell the student about waves?
A.Light waves are electromagnetic waves and sound waves are mechanical waves.
B.Light waves are mechanical waves and sound waves are electromagnetic waves.
C.Both light waves and sound waves need a medium to travel through.
D.Neither light nor sound waves need a medium to travel through.
Answer:
A. Light waves are electromagnetic waves and sound waves are mechanical waves.
Explanation:
The experiment is clear proof that light waves are electromagnetic waves and that sound waves are mechanical waves.
Electromagnetic waves are waves that do not require a material medium for their propagation. Although, with material medium they can also be propagated. This is why in both set up, the bell still vibrates. Mechanical waves are dependent on the material in the medium. They cannot be propagated in vacuum. There is no matter present in vacuum to help transmit the sound waves.GIVING BRAINLIST ASAP
As the ice melts into liquid water, what happens to the kinetic energy of the particles in the sample?
Answer:
Increases
Explanation:
As ice melts into liquid water, the kinetic energy of the particles increases.
This is because to melt ices, heat energy is supplied.
The sum total of all the average speed of the particles in a substance is the heat energy. Heat is a form of kinetic energy. As more heat is added, the particles moves rapidly and the kinetic energy increase.Laszlo is running a column to separate a carboxylic acid and an alkyne. He accidentally uses acetone instead of hexane as his first eluent. What happens? A. The first fraction contains only carboxylic acid and the second fraction contains only alkyne. B. The first fraction contains both the carboxylic acid and the alkyne. C. The fractions are empty because both compounds remain on the column. D. The first fraction contains only alkyne and the second fraction contains only carboxylic acid. E. The first fraction contains only carboxylic acid and the alkyne remains on the column F. The first fraction contains only alkyne and the carboxylic acid remains on the column.
Answer:
B. The first fraction contains both the carboxylic acid and the alkyne.
Explanation:
Carboxylic acids dissolve in both polar and non-polar organic solvents hence they can dissolve in acetone along with the alkyne.
The correct sequence of adding eluting solvents is reversed, would have been the addition of hexane first in order to elute the alkyne selectively. The acetone may now be subsequently added to elute the carboxylic acid.
If this order the carboxylic acid and alkyne are eluted simultaneously.
Balance the following equation:
B203(s) + HF(l) => BF3(g) + H20(l)
20 B203(s) + 12180 HF(l) = 4060 BF3(g) + 609 H20(l)
How does mass of an object affects velocity?
Answer: The amount of matter in a particle or object.
Explain how density is used to calculate the number of atoms in a mole.
Answer: The equation is fairly simple. The number of atoms of ANY substance in a volume is: # of atoms = N * (density) * volume / (Molecular Weight). N is a constant called Avogadro's number and its equal to 6.022*1023 atoms/mole.
Explanation:
Select the correct electron configuration for Cu (Z = 29) Answer a. [Ar]4s13d10 b. [Ar]4s24p63d3 c. [Ar]4s23d0 d. [Ar]4s24d9 e. [Ar]5s24d9
Answer:
a. [Ar]4s13d10.
Explanation:
Hello!
In this case, since the electron configuration allows us to arrange the electrons moving around the atom of an element and equal the atomic number, we can write the electron configuration of copper as shown below:
[tex]Cu^{29}=1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^9[/tex]
However, in terms of the argon's electron configuration, which is:
[tex]Ar^{18}=1s^2,2s^2,2p^6,3s^2,3p^6[/tex]
We infer that the electron configuration of copper in terms of that of argon's is:
[tex]Cu^{29}=[Ar]4s^2,3d^9[/tex]
Therefore, the answer is a. [Ar]4s13d10 because the 4s² can be written as 4s¹ and therefore the 3d⁹ is changed to 3d¹⁰.
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Remember this quote?!
Answer:
Yes
Explanation:
BRAINLIEST TO CORRECT FASTTT
3. Which of the following atoms would have the highest first ionization energy?
a. Li
b. Be
c. Na
d. Mg
4. What is the name of the phenomenon in which electrons are ejected from the surface of a metal when light shines on the metal?
a. Photoelectric effect
b. Diffraction
c. Quantization
d. Aufbau principle
10. How many core electrons does this element have? 1s2 2s2 2p5
a. 9
b. 4
c. 2
d. 5
11. The electron configuration for a chlorine atom is: 1s2 2s2 2p6 3s2 3p5. What electron configuration represents the electrons that make up only the valence electrons for a chlorine atom?
a. 1s^2 2s^2 2p^6
b. 3s^2 3p^5
c. 1s^2
d. 1s^2 2s^2 2p^6 3s^2
Answer:
3. d. Mg 4. a. Photoelectric effect 10. c. 2 11. b. 3s^2 3p^5
Explanation:
Calculate the mass of calcium carbonate produced if 15.2 mL of 0.306 M K2CO3 is reacted with 17.0 mL of 0.295 M CaCl2.
Answer:
[tex]m_{CaCO_3}=0.465g[/tex]
Explanation:
Hello!
In this case, since the reaction between two aqueous solutions may turn out in the production of a solid precipitate, for potassium carbonate and calcium chloride, calcium carbonate is precipitated out as shown below:
[tex]CaCl_2(aq)+K_2CO_3(aq)\rightarrow 2KCl(aq)+CaCO_3(s)[/tex]
Now, since the two reactants are in a 1:1 mole ratio, we infer they react in the same proportion, thus we compute the reacting moles, considering the used volumes of those molar solutions:
[tex]n_{K_2CO_3}=0.0152L*0.306mol/L=0.00465mol\\\\n_{CaCl_2}=0.0170*0.295mol/L=0.00502mol[/tex]
Thus, since just 0.00465 mol out of 0.00502 moles of calcium chloride are consumed, the potassium carbonate is the limiting reactant, therefore the mass of yielded calcium carbonate (molar mass = 100.09 g/mol) is:
[tex]m_{CaCO_3}=0.00465molK_2CO_3*\frac{1molCaCO_3}{1molK_2CO_3} *\frac{100.09gCaCO_3}{1molCaCO_3}\\\\m_{CaCO_3}=0.465g[/tex]
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A piston compresses the air in the cylinder by doing 97.0 J of work on the air. As a result, the air gives off 191.0 J of heat to the surroundings. If the system is the air in the cylinder, what is the change in its internal energy?
Answer:
[tex]\Delta U=-94.0J[/tex]
Explanation:
Hello!
In this case, since the first law of thermodynamics allows us to understand how the energy behaves when heat and work are involved during a process, we can mathematically define it as:
[tex]Q-W=\Delta U[/tex]
Whereas Q is the heat added to the system, W the work done by the system and ΔU the change in the internal energy, we can notice that since 97.0 J of work are done on the system it would be negative and the given off heat is also heat due to the used convention; therefore the change in its internal energy turns out:
[tex]-191.0J-(-97.0J)=\Delta U\\\\\Delta U=-94.0J[/tex]
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The object in this photo belongs to which major part of the Earth system?
O A. Hydrosphere
O B. Biosphere
O C. Atmosphere
O D. Geosphere
Answer:
B
Explanation:
Answer: B the biosphere it is a animal and a living thing
Explanation:
How many days are in an Earth year?
Is it possible to use both renewable and nonrenewable resources together?
Answer:
use socratic it helps me get A+
how many moles would 1.00 x10^23 molecules of methane represent
Answer:
Explanation:
1 x 10²³ molecules of methane
6.02 x 10²³ molecules of methane = 1 mole of methane
10²³ molecules of methane = 1 / 6.02 moles of methane
= .166 moles .
The moles of methane that contain 1 [tex]\rm \times\;10^2^3[/tex] molecule have been 0.166 mol.
The number of molecules of a compound can be given by the Avagadro number. The number of molecules in a mole of the compound has been equal to the Avagadro number. The Avagadro number has been constant with a value of 6.023 [tex]\rm \times\;10^2^3[/tex].
6.023 [tex]\rm \times\;10^2^3[/tex] molecules = 1 mole.
The given molecules of methane have been = 1 [tex]\rm \times\;10^2^3[/tex] .
The moles of given molecules will be:
6.023 [tex]\rm \times\;10^2^3[/tex] molecules = 1 mole.
1 [tex]\rm \times\;10^2^3[/tex] molecules = [tex]\rm \dfrac{1}{6.023\;\times\;10^2^3}\;\times\;1.0\;\times\;10^2^3[/tex] moles.
1 [tex]\rm \times\;10^2^3[/tex] molecules = 0.166 moles.
The moles of methane that contain 1 [tex]\rm \times\;10^2^3[/tex] molecule have been 0.166 mol.
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solution of nitric acid is 60% with the specific gravity 1.15 calculate the volume of the seed required to prepare 250 ml semi normal solution
Answer:
This dilution problem uses the equation
M
a
V
a
=
M
b
V
b
M
a
= 6.77M - the initial molarity (concentration)
V
a
= 15.00 mL - the initial volume
M
b
= 1.50 M - the desired molarity (concentration)
V
b
= (15.00 + x mL) - the volume of the desired solution
(6.77 M) (15.00 mL) = (1.50 M)(15.00 mL + x )
101.55 M mL= 22.5 M mL + 1.50x M
101.55 M mL - 22.5 M mL = 1.50x M
79.05 M mL = 1.50 M
79.05 M mL / 1.50 M = x
52.7 mL = x
59.7 mL needs to be added to the original 15.00 mL solution in order to dilute it from 6.77 M to 1.50 M.
Explanation:
What is the ability to do work defined as?
OA. pressure
OB. energy
Ос.
force
OD
temperature
R
Answer:
It would be B
Explanation:
is there anything smaller than an atom
Answer:
subatomic particles are actually small than atoms
Yes, particles such as protons, neutrons, and electrons that make up the atom are smaller than atoms.
What attracts the electrons from the atom on the left?
The neutrons from the atom on the left
The electrons from the atom on the right
The protons from the atom on the right
The neutrons from the atom on the right
According to the placement of elements in the periodic table and the atomic structure, protons from atom on right will attract electrons from atom on left.
What is periodic table?Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.
Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.
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How many hydrogen atoms are in a molecule of table sugar (C12H22011)?
O A. 11
B. 22
C. 12
D. 45
Hydrogen atoms are in a molecule of table sugar (C₁₂H₂₂O₁₁) is 22
An atom is a particle of matter that uniquely defines a chemical element and in the table sugar molecule the formula is C₁₂H₂₂O₁₁ then the hydrogen atoms are present in the molecule is 22 and it is used for the adding sweetness to your coffee and baking and used as the food manufacture in various food and drink products due to its unique properties that add to the appearance
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How many Cl atoms are present in 307.62 grams of ccl4?
Answer: atomic mass of cl = 35.5 amu.
molar mass of ccl4 = (12) +4 (35.5)
= 12 + 142
= 154 amu.
mass of ccl4 = 385 g
no. of moles present = 385 / 154 = 2.5 mole
so, 2.5 mole of ccl4 is present in 385 grams .
Explanation:
In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.
Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance.
If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.
The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. We use the most common isotopes. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass.
A common request on this site is to convert grams to moles. To complete this calculation, you have to know what substance you are trying to convert. The reason is that the molar mass of the substance affects the conversion. This site explains how to find molar mass.
Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. These relative weights computed from the chemical equation are sometimes called equation weights.
Finding molar mass starts with units of grams per mole (g/mol). When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. The formula weight is simply the weight in atomic mass
Consider the reaction of N aHCO3 with an acid, HA. How many grams of NaHCO3 are required to produce 1.25 g of CO2 ?
Answer:
2.33g of NaHCO3
Explanation:
The balanced equation of the reaction is;
2NaHCO3 + 2HA --> 2CO2 + 2H2O + 2NaA
From the reaction above;
2 mol of NaHCO3 produces 2 mol of CO2
using mass = number of moles * molar mass
Mass = 2 * 84 = 164g of NaHCO3
Mass of CO2 = 2 * 44 = 88g of CO2
This means 164g of NaHCO3 produced 88g of CO2
How many grams of NaHCO3 would then produce 1.25g of CO2?
164 = 88
x = 1.25
upon solving for x;
x = 2.33g
The reaction of sodium bicarbonate with acid produces equivalent moles of carbon dioxide. The mass of sodium bicarbonate in the given reaction is 2.352 grams.
What is stoichiometric law?The stoichiometric law is used for the determination of the moles of each product or reactant, from the stoichiometric coefficient of the balanced chemical equation.
The balanced chemical equation for the reaction of sodium bicarbonate with HA acid is :
[tex]\rm 2\;NaHCO_2\;+\;2\;HA\;\rightarrow\;2\;CO_2\;+\;2\;H_2O\;+\;2\;NaA[/tex]
From the stoichiometric law, 2 moles of carbon dioxide is produced from 2 moles of sodium bicarbonate.
The moles of carbon dioxide in 1.25 grams is:
[tex]\rm Moles=\dfrac{mass}{molar\;mass}\\\\ Moles\;CO_2=\dfrac{1.25\;g}{44\;g/mol} \\\\Moles\;CO_2=0.028\;mol[/tex]
From the stoichiometric law, the moles of sodium bicarbonate required is:
[tex]\rm 2\;mol\;CO_2=2\;mol\;NaHCO_3\\\\0.028\;mol\;CO_2=\dfrac{2\;mol}{2\;mol}\;\times\;0.028\;mol\;NaHCO_3\\\\ 0.028\;mol\;CO_2=0.028\;mol\;NaHCO_3[/tex]
The mass of sodium bicarbonate required is given as:
[tex]\rm Mass=Moles\;\times\;Molar\;mass\\Mass\;NaHCO_3=0.028\;mol\;\times\;84\;g/mol\\Mass\;NaHCO_3=2.352\;g[/tex]
The mass of sodium bicarbonate in the reaction is 2.352 grams.
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A sample of NaOH (sodium hydroxide) contains a small amount of Na2CO3 (sodium carbonate). For titration to the phenolphthalein endpoint, 0.200 g of this sample requires 23.98 mL of 0.100 M HCl. An additional 0.700 mL of 0.100 M HCl is required to reach the methyl orange endpoint. What is the percentage of Na2CO3 by mass in the sample?
Express your answer to three significant figures and include the appropriate units.
Answer:
1.86% Na₂CO₃
Explanation:
The additional volume that is required to reach endpoint with methyl orange indicator is due the presence of carbonate (Calculated as sodium carbonate). The reaction is:
Na₂CO₃ + 2HCl → H₂O + CO₂ + 2NaCl
Thus, we need to obtain moles of HCl and, using the reaction, solve for moles of sodium carbonate, its mass and percentage using molar mass of Na₂CO₃: 106g/mol.
Moles HCl:
0.700mL = 0.700x10⁻³L * (0.100mol / L) = 7.00x10⁻⁵moles HCl
Moles Na₂CO₃:
7.00x10⁻⁵moles HCl * (1mol Na₂CO₃ / 2 mol HCl) = 3.5x10⁻⁵ moles Na₂CO₃
Mass:
3.5x10⁻⁵ moles Na₂CO₃ * (106g / mol) = 0.00371g Na₂CO₃
Percentage:
0.00371g Na₂CO₃ / 0.200g * 100 =
1.86% Na₂CO₃Determine the energy in joules of a photon whose frequency is 3.05 ✕ 10^17 Hz.
Answer:
The energy of photon is 20.22×10⁻¹⁷ J
Explanation:
Given data:
Frequency of photon = 3.05×10¹⁷ Hz
Energy of photon = ?
Solution:
Formula:
E = hf
h = planck's constant = 6.63×10⁻³⁴ Js
Now we will put the values in formula.
E = 6.63×10⁻³⁴ Js × 3.05×10¹⁷ Hz
Hz = s⁻¹
E = 20.22×10⁻¹⁷ J
Thus, the energy of photon is 20.22×10⁻¹⁷ J
Which of the following pairs of elements would form an ionic bond? (Select all that
apply.)
T Pand cl
Hand N
u Kand F
Mg and I
Answer:t pans
Explanation:it’s the cool thing
Write the dissolution reaction for ammonium phosphate in water. Be sure to specify the state of each reactant and product.
Answer:
The equation showing the dissolving of solid ammonium phosphate in water is: (NH4)3 PO4 (s) → 3NH4 +1 (aq) + PO4 -3 (aq).
Explanation:
Please help me it’s due today at 6:00pm will mark the brainiest and more points please help me
Answer:
C.
Explanation:
The same amount of force reacts to you
A 7.2 L balloon at 2 atm of pressure has its pressure reduced to 0.5 atm. What is the new size of the balloon, in liters?
Explanation:
using Boyles law: which shows the relationship between pressure and volume, when temperature Is kept constant
P1V1 = P2V2
2 x 7.2 = 0.5 x V2
14.4 = 0.5 x V2
V2 = 14.4/0.5 = 28.8 L
Hence the new size of the balloon in litres is 28.8