Answer:
c
Explanation: i am for sure
100gm of a 55% (M/M) nitric acid solution is to be diluted to 20% (M/M) nitric acid.
How many liters of water should be added to the starting solution?
Volume of H₂O added = 175 ml
Further explanationGiven
100 gm of a 55% (M/M) and 20% (M/M) nitric acid solution
Required
waters added
Solution
starting solution
mass H₂O = 45%=45 g
%mass of H₂O in new solution = 100%-20%=80%
Can be formulated for %mass H₂O :
[tex]\tt \dfrac{45+x}{100+x}=80\%\\\\45+x=0.8(100+x)\\\\45+x=80+0.8x\\\\35=0.2x\rightarrow x=175~g[/tex]
For water mass=volume(density = 1 g/ml)
So volume added = 175 ml
Which of the following electron configurations correspond to an excited state? Identify the atoms and write the full, ground state electron configuration where appropriate.
1s22s23p1
1s22s2sp6
1s22s22p43s1
[Ar] 4s23d54p1
Electron configurations correspond to an excited state is 1s₂, 2s₂, 3p₁.The electrical configuration 1s₂, 2s₂, 3s₁ demonstrates that the atom is in the excited state.
What is electronic configuration ?The distribution of an atom's or molecule's electrons in atomic or molecular orbitals is known as the electron configuration in atomic physics and quantum chemistry.
An electron is in an excited state when it momentarily possesses an energy level higher than its ground state. If an electron receives more energy, such as when it absorbs a photon, or packet, of light, or collides with an adjacent atom or particle, it can become excited.
The primary distinction between a system's ground state and excited state is that a system's ground state is any condition in which its electrons are at their lowest potential energy levels, whereas an excited state is any state in which they are at an energy greater than the system's ground state.
Thus option A is correct.
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The electron configurations [tex]\rm 1s^2\ 2s^2\ 3p^1[/tex], [tex]\rm 1s^2\ 2s^2\ 2p^4\ 3s^1[/tex], and [tex]\rm [Ar] 4s^2\ 3d^5\ 4p^1[/tex]
corresponds to excited states whereas [tex]1s^2\ 2s^2\ 3p^6[/tex] corresponds to ground state. The correct answer is option 2.
The electron configuration of an atom describes how its electrons are distributed among the various energy levels and orbitals.
The electron configuration [tex]\rm 1s^2\ 2s^2\ 3p^1[/tex] corresponds to an excited state. This configuration indicates that one of the electrons in the 2p orbital has been excited to a higher energy level.The electron configuration [tex]1s^2\ 2s^2\ 3p^6[/tex] is the ground state configuration of the noble gas argon (Ar).The electron configuration [tex]\rm 1s^2\ 2s^2\ 2p^4\ 3s^1[/tex]corresponds to an excited state. This configuration indicates that one of the electrons in the 3s orbital has been excited to a higher energy level.The electron configuration [tex]\rm [Ar] 4s^2\ 3d^5\ 4p^1[/tex]corresponds to an excited state. This configuration indicates that one of the electrons in the 4p orbital has been excited to a higher energy level.Therefore, the electron configurations [tex]\rm 1s^2\ 2s^2\ 3p^1[/tex], [tex]\rm 1s^2\ 2s^2\ 2p^4\ 3s^1[/tex], and [tex]\rm [Ar] 4s^2\ 3d^5\ 4p^1[/tex]correspond to excited states, while the electron configuration [tex]1s^2\ 2s^2\ 3p^6[/tex] is the ground state configuration of argon. Option 2 is the correct answer.
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Which of the following measurements are recorded to three significant figures?
Select one or more:
a)0.003 L
b)140 g
c)1,610 s
d)0.0890 m
Answer:
c) 1610 s
d) 0.0890 m
Explanation:
Significant figures:
The given measurement have four significant figures 1234.
All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.
Zero between the non zero digits are consider significant like 104 consist of three significant figures.
The zeros at the right side when decimal point is present e.g 2400. are also significant. There are four significant figures are present.
a) 0.003 L
This measurement have 1 significant figure which is 3.
b) 140 g
This measurement have 3 significant figure 1, 4. In this measurement 0 is trailing zero that's why it is not consider significant.
c) 1610 s
This measurement have 3 significant figures 1, 6, 1.
d) 0.0890 m
This measurement have 3 significant figures 8,9 and 0
My Teacher didn't teach us this please help
Answer:
first; why is it a question if teacher never teached you it LOL anyways..
Explanation:
i would say its the second one
"The smae quality of each element is present on both sides of the equation."
There is an equal number of protons and __________ in a neutral atom.
A. electrons
B. neutrons
C. protons
D. elements.
the answer is electrons
Which molecules is converted directly to acetyl CoA without the intermediate step of being converted first to pyruvate
Answer:
Fatty acids
Explanation:
Acetyl coA is a compound vital for the process of cellular respiration in the mitochondria. It is the starting material of the kreb's cycle or TCA cycle, which takes place in the mitochondria. During the metabolism of glucose (glycolysis), a molecule called PYRUVATE is first synthesized before becoming acetyl coA in the mitochondrion.
However, the metabolism of FATTY ACIDS (monomers of lipids) directly gives rise to acetyl coA without first becoming pyruvate. The fatty acids molecule undergo Beta- oxidation to produce acetyl coA, which enters the TCA cycle to continue cellular respiration.
In the following image, atoms are represented by colored circles. Different colors represent different
types of atoms. If atoms are touching, they are bonded.
Which of the following boxes shows a mixture of elements and compounds?
A. D
B. C
C. B
D. A
Which of the following is most likely to occur due to severe winds during a hurricane?
Answer:
a
Explanation:
Answer:
A
Explanation:
An atom has 38 protons and 42 neutrons it is ?
Answer:
The answer is, Strontium
Answer:
Name Molybdenum
Atomic Mass 95.94 atomic mass units
Number of Protons 42
Number of Neutrons 54
Number of Electrons 42
Explanation:
how many molecules are in this formula. 4Mg3P2
Answer:
jajaja como le ago pa mandarte mensaje
What is Applied chemisrty??
Answer:
Applied Chemistry is the scientific field for understanding basic chemical properties of materials and for producing new materials with well-controlled functions. (:
Answer:
Explanation:
Applied Chemistry is the scientific field for understanding basic chemical properties of materials and for producing new materials with well-controlled functions. (:
_____has particles with the greatest average kinetic energy
a
Ice water
b
Hot water
c
Warm water
d
Room temperature water
Answer:
c warm water
Explanation:
Kinetic energy is related to temperature. The molecules in a glass of warm water have more kinetic energy (they move faster – see Racing Molecules) than the molecules in a glass of cold water. The temperature of a substance is the average* amount of kinetic energy its molecules have.
Answer:
hot water
Explanation:
PLEASE HELP I WILL GIFT 100 POINTS!!!!!
Answer:
Liquid A
Explanation:
the least dense will be at the top. like icecubes in water. the ice is less dense than the water so it floats
Answer:
Liquied A
Explanation:
It is at the top and it is the lightest if it is at the bottom then it has the most density
Which term best describes this reaction? O addition. O Condensation. O elimination. O substitution
Answer:
addition
Explanation:
because you add the two chlorides by breaking the carbon carbon double bond
Round off 808.57 to 4 significant figures.
Answer:
808.6
Explanation:
A different element, , is located in the same row of the periodic table as element , but has roughly half the atomic mass of . Is the atomic radius of less than, equal to, or greater than the atomic radius of ? Justify your answer using principles of atomic structure.
Answer:
It is way too long I can't help with it Honestly
An element in the same row with roughly half of the atomic mass always has a greater atomic radius.
Atomic radius: It is the distance between the nucleus and the outermost shell.
Atomic mass: It is the mass or the number of nucleons or protons and neutrons inside an atom.
In a row, the number of protons increase but the number of shells remains constant.
Hence, the positive protons in the nucleus attract electrons with more electrostatic force.
Therefore, an element in the same row with roughly half of the atomic mass always has a greater atomic radius.
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Which statement correctly describes soil horizon C?
Answer:
Explanation:
It is the horizon that contains the least humus.
PLEASE ANSWER FAST DUE IN 2 MINUTES
The gas released by animal into the environment is ______
Answer:
Carbon dioxide gas
Explanation:
When an animal breathes, it takes in oxygen gas and releases carbon dioxide gas into the atmosphere.
Please help me!
Will give the brainliest!
Please answer correctly.
Really urgent!!
Explanation:
1,a: I) group 2 = strontium
ii) chlorine
iii) nitrogen
B) i) strontium outer shell=2
ii)nitrogen:outer shell=5
iii) chlorine=7
C)metal
strontium
nickel
molybdenum
cesium
tin
non metal:..
chlorine
nitrogen
neon
Without completing the calculations, determine what the new pressure will be in the problem below. Also,
explain how you were able to determine the new pressure without completing the calculations. Pay special
attention to how the temperature is changing in the problem.
A sample of ozone (0:2) is stored at x kelvin and 12.5 Pa. If the temperature is doubled to 2x kelvin,
what will the new
pressure be?
The new pressure will be doubled
Further explanationGiven
A sample of ozone (O₃) at x K and 12.5 Pa. (T₁= x K, P₁=12.5 Pa)
the temperature is doubled to 2x K (T₂=2x)
Required
the new pressure
Solution
Gay Lussac's Law
When the volume is not changed, the gas pressure is proportional to its absolute temperature
[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
Input the value :
[tex]\tt \dfrac{12.5}{x}=\dfrac{P_2}{2x}\\\\P_2=\dfrac{12.5\times 2x}{x}[/tex]
PLS I NEED HELP ITS IMPORTANT I AM GIVING 25 POINTS HELP PLEASE. I NEED IT FAST
Why is it important for cells to be able to turn genes on and off? Select ALL Correct reasons!
Question 2 options:
A. so the cell is not too chaotic
B. so the cell can respond to the environment
C. so the cells can grow uncontrollably
D.so the cell does not waste energy
Answer:
B
Explanation: Since you need this quick, its because it needs to respond to the environment. I dont remember the exact term
Why do u wash the residue with distilled water
+20 points! Answer correctly. Wrong or irrelevant answers will be reported. Tysm in advance!
Answer:
To remove impurities
Explanation:
Impurities may react with other chemicals if you are still continuing with the experiment.
Is Na3PO3 soluble or insoluble in water and why?
Answer:
Na3Po3 is soluble in water
Sodium phosphite, often referred to as [tex]Na_3PO_3[/tex], is generally considered to be water soluble.
Because the sodium cation (Na+) has a significant affinity for water molecules due to their positive charge, sodium compounds generally have a tendency to be soluble in water. The three sodium ions increase the solubility of [tex]Na_3PO_3[/tex] and make it even more soluble.
The solubility of [tex]Na_3PO_3[/tex] is similarly affected by the phosphate ion [tex](PO^3^-)[/tex]. Phosphates are normally soluble in water unless they are coupled with cations that generate intractable compounds, like some heavy metal ions. The strong ion-dipole interactions between sodium ions and water molecules can be used to explain why [tex]Na_3PO_3[/tex] is soluble in water.
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PLZ HELP!
What would happen to work and power if the mass of the person walking was increased or decreased? EXPLAIN.
Answer:
work and power increases or decreases with the mass
Explanation:
All atoms are positively charged, with the number of protons exceeding the number of electrons. negatively charged, with the number of electrons exceeding the number of protons. neutral, with the number of protons equaling the number of electrons.
Answer:
Yah, it's true.
because protons are represented as helium (²4He) which are positive.
electrons are represented as 0-1e which is negative
I DoNt CaRe....
BlA BlA BlA BlA
Answer?
Y r u singing?!?
Answer:OKEI
Explanation:im sorry for hatin but hatins what i do.i really need ma points so i can be respected more than u
3.Write the chemical equation for the reaction when methane burns in (2)
(a) Sufficient supply of oxygen
(b) Insufficient supply of oxygen
Answer:
a)CH4 + O2 = CO2 + H2O
b)4CH4+5O=2CO+8H2O+2C
The_____form acidic compounds with hydrogen.
Answer:Halogens
Explanation:
I looked it up lol
A _____________ is formed when water empties into a lake or ocean
Answer:
a delta
Explanation:
he place where a river enters a lake, larger river, or the ocean is called its mouth. River mouths are places of much activity. As a river flows, it picks up sediment from the river bed, eroding banks, and debris on the water. ... When large amounts of alluvium are deposited at the mouth of a river, a delta is formed.
What type of bonding exists between the carbon atoms to create diamond ?
Answer:
Covalent bonds.
Explanation:
Diamond is organized in a giant lattice structure with strong covalent bonds between carbon atoms. Each carbon atom forms 4 bonds. Explanation: Each carbon atom has four electrons in its outer shell, all of which form covalent bonds that are strong and hard to break.