Answer:
D) A solid melting into a Liquid.
How many sig figs are in 0.0003422
Answer:
4
Explanation:
The zeros before a non zero digit do not count as significant figures so there are 4 sig figs in the number
how many grams of o2 are needed to produce 3.50 g of co2
Answer:
7 g of O2
Explanation:
For 1-C2 2-O2 are needed
3.50 + 3.50 = 7.00
please mark as brainlist answer
7 g is needed to produce 3.50 g of co2
The question can be solved as follows
= 3.50(2)
=7
Hence 7 g is needed to make 3.50 g of co2
Please see the link below for more information
https://brainly.com/question/22076117?referrer=searchResults
What is the pH of a 8.4 x 10 − 6 M H + solution?
Answer:
The answer is
5.08Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log( {H }^{ + } ) [/tex]
From the question
[tex]{H }^{ + } = 8.4 × {10}^{-6} M[/tex]
The pH of the solution is
[tex]pH = - log(8.4 \times {10}^{ - 6} ) \\ = 5.0757207...[/tex]
We have the final answer as
5.08Hope this helps you
Indium has an average atomic mass of 114.818 amu. One of its two isotopes has an atomic mass of 114.903 amu with a percent abundance of 95.70. What is the mass of the other isotope?
Answer:
The atomic mass of second isotope is 112.926 amu.
Explanation:
Given data:
Average atomic mass of indium = 114.818 amu
Atomic mass of one isotope = 114.903 amu
Percentage abundance of 1st isotope = 95.70%
Mass of other isotope = ?
Solution:
First of all we will calculate the percentage abundance second isotope.
100 - 95.70% = 4.3%
percentage abundance of second isotope = 4.3%
Now we will calculate the mass if second isotope.
Average atomic mass of indium = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
114.818 = (114.903×95.70)+(x×4.3) /100
114.818 = 10996.2171 + (x4.3) / 100
114.818×100 = 10996.2171 + (x4.3)
11481.8 - 10996.2171 = (x4.3)
485.583 = x
x = 485.583 /4.3
x = 112.926
The atomic mass of second isotope is 112.926.
PLEASE HELP ASAP ITS DUE IN THE NIGHT
Energy is converted between different forms- watch the video below, then describe how energy is converted when you listen to music through headphones. Your answer should include four different energy forms
Answer:
Electrical light energy, heat energy,
Explanation:
Electrical light energy, heat energy, etc. Chemical energy can be converted to electrical energy. Thermal energy can be converted to heat energy. Nuclear energy can be converted to light energy and heat energy.
1pt The step by step method scientists use to solve problems and test ideas is
O A. The Scientific Method
B. The Report
c. The Research
O D. Learning Objectives
A distillation column is separating 150.0 kmol/h of a saturated liquid mixture that is 30.0 mol% methanol and 70.0 mol% water. The column operates at 1.0 atm pressure. Reflux ratio is 2.0, and reflux is returned as a saturated liquid. We desire a 97.0% recovery of methanol in the distillate and a methanol distillate mole fraction of 0.990. Find distillate ow rate D, bottoms flow rate B, methanol mole fraction in the bottoms xM, bot, and the fractional recovery of water in the bottoms.
Answer:
Explanation:
From the information given:
Feed F = 150.0 kmol/hr
The saturated liquid mixture of the distillation column is [tex]X_F[/tex] = 30%
Reflux ration = 2.0%
methanol distillate mole fraction [tex]X_D[/tex] = 0.990
recovery of methanol in the distillate = 97.0%
The distillate flow rate D can be determined by using the formula;
[tex]D = 0.97 (F* X_F)[/tex]
D = 0.97 × 150 × 0.3
D = 43.65 kmol/h
The bottom flow rate Balance B on the column is:
F = D + B
150 = 43.65 + B
B = ( 150 - 43.65 )kmol/h
B = 106.35 kmol/h
The methanol mole fraction in the bottom [tex]x_M[/tex] can be computed by using the formula:
[tex]F*X_F = DX_D + BX_B[/tex]
150(0.3) = 43.65(0.999) + 106.3([tex]X_B[/tex])
45 = 43.60635 + 106.3([tex]X_B[/tex])
45 - 43.60635 = 106.3([tex]X_B[/tex])
1.39365 = 106.3([tex]X_B[/tex])
[tex]X_B[/tex] = 1.39365 / 106.3
[tex]X_B[/tex] = 0.013
the fractional recovery of water in the bottoms f is calculated as:
[tex]f = \dfrac{B(1-X_B)}{F_X_F}[/tex]
[tex]f = \dfrac{106.35(1-0.013)}{150\times 0.7}[/tex]
[tex]f = \dfrac{106.35(0.987)}{150\times 0.7}[/tex]
f = 0.99969
What element has the following electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d8?
Answer:
Explanation:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d⁸
The element is Darmstadtium . It is a d block element . Its symbol is Ds . Its atomic no is 110 .
The element having the given electronic configuration with atomic number 110 is Darmstadtium (Ds).
From the electronic configuration, the number of electrons present in the atom can be calculated.
The number of electrons in the given electronic configuration are :
2+2+6+2+6+2+10+6+2+10+6+2+14+10+6+2+14+8
The number of electrons in the given configuration = 110
The number of electrons in the atoms has been equal to the atomic number. The element having the atomic number 110 is Darmstadtium.
The element belongs to the d block with the symbol Ds. It has been an artificially produced element.
For more information about electronic configuration, refer to the link:
https://brainly.com/question/16762037
What does the number on the bottom left of the symbol show?
Answer:
How many protons the elements has.
Explanation:
It is the atomic number, and that is the number of protons that an element has.
Answer:
The number at the bottom left shows the atomic number of the element. It’s the number of protons in the nucleus.
Explanation:
How many g are in 2.39kg of magnesium powder
Answer:
2.3 Work with the numerator first: 165 mg is 0.165 g. ... 2.9 (a) 1 mg Mo 1 10 3 g
Explanation:
im pretty sure this is the answer
a
A
a
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Question 6
Plant cells have a strong, rigid outer layer known as the cell wall. The function of the cell wall is to -
help the cell maintain its shape under changing water pressure.
convert energy from sunlight into chemical energy.
regulate the transfer of material into the cell.
separate genetic material from the rest of the cell.
Next Question
Answer:to regulate the transfer on material into and out of the cell
WILL GIVE BRAINLIEST: Carbon-14 dating is used to find the age of ancient objects. The half-life of Carbon-14 is 5730 years. If a piece of a clay pot is found to have undergone 1.5 half-lives, about how old is the potshard?
Answer:
half life of carbon=5730 yrs
half life passed=1.5
how old is the pot=??
Explanation:
about 8595 yrs old bcuz its half life is 5730yrs and after 1.5half lives 8595yrs have passed
An atom of Silver loses three electrons, what is its charge?
Answer:
+3
Explanation:
If an atom loses electrons, it becomes positive. Because silver loses 3 electrons, the charge becomes positive 3.
Rewrite the sentence, marana eats salad for lunch yesterday
Which phrase describes how metamorphic rocks form?
Answer:
Metamorphic rocks are the rocks that arise from the conversion of existing rock types in a process called metamorphism, means changing of forms. Metamorphic rocks are formed from the other rocks that are changing because of heat or pressure applied. One of this example is the Earth movements that causing rocks to deeply bury or squeezed which will make the rocks heated and put under great pressure. They are not melting but the minerals they are containing are changed chemically that will form metamorphic rocks. Sometimes other rocks are formed when the others are close to some molten magma and getting heated.
If im wrong correct me
How many ways can 8642 be arranged
Answer:
In 100 ways
Explanation:
What is the correct definition of speed?
A. time per distance (hours per mile or seconds per meter)
B.distante per time (miles per hour or meters per second)
C.time (hours or seconds
D.distance (miles or meters)
Answer:
B
Explanation:
What type of force should be applied on a football to move it forward?
Balanced force in backward direction
Unbalanced force in forward direction
Non-contact force in backward direction
Gravitational force in downward direction
Answer:
unbalanced force
Explanation:
Answer:
unbalenced ehhhhhh hi
Explanation:
In Universe , recently discovered by an intrepid team of chemists who also happen to have studied interdimensional travel, quantum mechanics works just as it does in our universe, except that there are eight orbitals instead of the usual number we observe here. Use these facts to write the ground-state electron configurations of the seventh and eighth elements in the first transition series in Universe . Note: you may use to stand for the electron configuration of the noble gas at the end of the row before the first transition series.
Answer:
Sixth transition element: [X] 3d8 4s0
Seventh transition element: [X] 3d8 4s0
Explanation:
In the universe, we have 5 number of "d" orbitals.
Now, Aufbau's rule states that in the ground state of an atom/ion, the electrons will usually fill atomic orbitals of the lowest available energy levels before they occupy higher levels. Meanwhile Hund's rule states that all orbitals in a subshell will be singly occupied with one electron before any single orbital is doubly occupied, and also all electrons in singly occupied orbitals will have the same spin.
From the periodic table, we know that the 6th & 7th transition elements in the universe are Iron & cobalt respectively. Their respective electronic configuration are;
Iron - [Ar] 3d6 4s2
Cobalt - [Ar] 3d7 4s2
Now, in the new universe(L) where there are 8 d - orbitals: from a combination of aufbau's rule and hund's rule; since there are six numbers of d orbitals as earlier said, in iron, which is the sixth transition metal, due to the fact that half filled orbitals will be more stable than partially filled orbitals, it means the 4s orbital will be empty and then two electrons will be removed from the 4s and used to fill the 3d orbital to half way.
Thus, ground state configurations of
Iron = [X] 3d8 4s0
Similarly, for the 7th transition element which is cobalt, the new extra electron will just fill the lower energy orbital which is 4s,thereby leaving the eight numbers of 3d orbitals to be half filled.
Thus, ground state configurations of
Cobalt = [X] 3d8 4s1
Therefore their ground state configurations are;
- Sixth transition element: [X] 3d8 4s0
Seventh transition element: [X] 3d8 4s1
Match the assumption with the correct unit of concentration.
1- Molarity
2- Molality
3- mass %
4- mole fraction
5- parts per a million(ppm)
A. 1 kg of solution
B. 1 g of solute
C. 100 g of solute
D. 1 mole solute
E. 1L of solute
F. 100 g of solution
G. 1 mole of solvent
H. 1L of solvent
I. 1 mole of solution
J. 1 kg of solvent
K. 1 g of solution
L. 1L of solution
M. 1 kg of solute
Answer:
1. D/E
2. D/J
3. B/F
4. D or G/I
5. A
Explanation:
This is about sort of concentrations:
1- Molarity
Moles of solute in 1 L of solution
(we can also say, mmoles of solute in 1 mL)
2- Molality
Moles of solute in 1kg of solvent
3. mass %
grams of solute in 100g of solution
4. mole fraction
moles of solute or solvent per moles of solution
5. ppm
mg of solute in 1kg of solution
(we can also say μg of solute in 1 g of solution, or mg solute in 1L of solution)
The chemical name for laughing gas is dinitrogen oxide. The two elements found in a sample of this gas are and .
Answer:
Nitrogen and Oxygen
Explanation:
Nitrous oxide, commonly known as laughing gas or nitrous, is a chemical compound, an oxide of nitrogen with the formula N2O.
What is an atomic mass of an element that has 26 neutrons 24 protons and 23 electrons
Answer:
50
Explanation:
atomic mass of an element is the sum of protons and neutrons as electro is negligible in weight.
Do hot things, like water or magma, always rise?
Answer:
Explanation:
No not always but it is more likely they will
The energy needed for the following process is 1.960 × 104 kJ/mol: Li(g) → Li3+(g) + 3e− If the first ionization energy of lithium is 5.20 × 102 kJ/mol, calculate the second ionization energy of lithium—that is, the energy required for the process: Li+(g) → Li2+(g) + e− A hydrogen-like ion is an ion containing only one electron. The energies of the electron in a hydrogen-like ion are given by En = −(2.18 × 10−18 J) (Z2)(1/n2) where En is the energy of the electron in the hydrogen-like ion, n is the principal quantum number, and Z is the atomic number of the element. Second ionization energy of lithium: × 10 kJ/mol (Enter your answer in scientific notation)
Answer:
Second Ionization energy, IE₂ = 7.27 x 10³ kJ/mol
Explanation:
Using En = -2.18 x 10¹⁸ J (Z²)(1/n²)
Z = atomic number; n = energy state of electron
Lithium has atomic number, Z = 3
Energy for n = 1:
E₁ = -2.18 x 10¹⁸ J (3²)(1/1²) = -1.962 x 10⁻¹⁷ J
When an electron is completely remove from an atom, n = ∞
Energy for n = ∞:
E∞ = -2.18 x 10¹⁸ J (3²)(1/∞²) = 0 J
Energy absorbed by the electron in order to be removed from the atom completely, ΔE = E∞ - E₁
ΔE = 0 - (-1.962 x 10⁻¹⁷ J) = 1.962 x 10⁻¹⁷ J = 1.962 x 10⁻²⁰ kJ
Ionization energy in kJ/mole of Li²⁺ ions, IE₃ is then calculated thus:
1 mole of Li²⁺ ions contains 6.02 x 10²³ ions
Ionization energy in kJ/mole of Li²⁺ ions = 1.962 x 10⁻²⁰ kJ x 6.02 x 10²³ = 1.185 x 10⁴ kJ/mol
Total energy, Etotal = IE₁ + IE₂ + IE₃
Second Ionization energy, IE₂ = Etotal - ( IE₁ + IE₃
IE₂ = 1.960 x 10⁴ kJ/mol - (520 kJ/mol + 1.185 x 10⁴ kJ/mol)
IE₂ = 7.27 x 10³ kJ/mol
Which activity removes a large amount of alcohol from the body
Which activity removes a large amount of alcohol from the body? After alcohol has been consumed and reaches the bloodstream, up to 10% of the alcohol is disposed of through the urine, and 80% to 90% by oxidation in the liver. The average drinker eliminates about 2/3 of a standard drink unit (a shot) per hour.
Identify the following atoms using their symbols:
a. contains 20 protons.
b. contains 12 electrons.
c. has atomic number = 30.
d. the fifth-period transition metal with properties similar to copper.
e. the group VA metalloid in the fifth period.
f. the lightest metallic element in group IVA.
g. the fourth-period element with properties similar to oxygen.
h. the metalloid in the second period.
i. the element with the fewest number of electrons in the sixth period.
j. the third-period element with the largest number of electrons.
Answer:
B.
Explanation:
just did it
The model illustrates a process by which a substance is taken up by a cell.
Which statements describe the process?
A. The model shows the process of endocytosis.
B. The process shown in the model requires energy from the cell.
C. The cell membrane in the model remains intact throughout the process.
D. The model shows the process of facilitated diffusion.
Answer:
A
Explanation:
I took intro to biotechnology
Which of the following statements is true about the sense of smell? Men and women smell the same number of odors. The amount of odors one can smell is unknown. Women tend to smell more odors than men. People can smell approximately 100 odors.
Answer:
the answer is C.) Women tend to smell more odors than men.
Explanation:
The statements is true about the sense of smell is women tend to smell more odors than men.
What is sense?Sense is defined as a biological system utilized by an organism for sensation, which is the process of acquiring information about the environment and responding to stimuli.
Sense organ is defined as a physiological part that is altered by a stimulus in such a way that it causes activation of associated sensory nerve fibers, which transmit specific impulses to the central nervous system, where they are processed as corresponding sensations.
It can also be defined as a portion of the body that allows you to feel the physical features of a scenario.
Ears, eyes, nose, tongue, skin are the five important sense organs of our body.
Thus, the statements is true about the sense of smell is women tend to smell more odors than men.
To learn more about sense, refer to the link below:
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Do Some vertebrates' offspring develop inside the mothers body.
Answer: Some reptiles, amphibians , fish and invertebrates carry their developing young inside them.
Explanation: Some of them :)
Which reaction is balanced correctly?
C 6H 12O6 + 3O 2 → 6CO 2 + 6H 2O
CH 4 + 4O 2 → CO 2 + 2H 2O C
3H 8 + 5O 2 → 3CO 2 + 4H 2O
C + O 2 → 2CO 2
C3H8 + 5O2 → 3CO2 + 4H2O .
This reaction is balanced correctly because number of atoms on reactant side and product side are same.
