Answers
Answer:
Q1. B
Q2. D
Q3. C
Hope it helps............
Plz mark as brainliest
Related Questions
If an element is on the 4th row of the periodic table...how many energy levels/rings would you need to draw a Bohr 's model of the element's atom?
Answers
Answer:
4 energy levels/rings
Explanation:
By the atomic model proposed by Niels Bohr, the electrons orbit around the nucleus in shells having different energy level each with the ability to contain a given maximum amount of electrons.
The closest shell to the nucleus named the K shell, can have a maximum of two electrons, the next shell known as the L shell can have 8 electrons while the next shell, M, can have a maximum of 18 electrons
The arrangement of the periodic table is based on the number and location of electrons such that elements in the 4th row (period 4 elements) have three completed energy levels/rings before, their valence ring making the total number of rings = 4 energy levels/rings.
A mixture of the gases neon and krypton is in a 2.00 L container with a pressure of 1.60 atm. The partial pressure of the neon is 0.40 atm. What is the partial pressure of the krypton?
Answers
Answer:
P(Kr) = 1.2 atm
Explanation:
According to Dalton law of partial pressure,
The total pressure inside container is equal to the sum of partial pressures of individual gases present in container.
Mathematical expression:
P(total) = P₁ + P₂ + P₃+ ............+Pₙ
Now we will solve this problem by using this law
Total pressure = 1.60 atm
Partial pressure of neon = 0.40 atm
Partial pressure of krypton = ?
Solution:
P(total) = P(Ne)+ P(Kr)
1.60 atm = 0.40 atm +P(Kr)
P(Kr) = 1.60 atm - 0.40 atm
P(Kr) = 1.2 atm
The partial pressure of Krypton in the mixture has been 1.2 atm.
Partial pressure can be defined as the pressure exerted by a single gas in the solution.
According to Dalton’s law of partial pressure, the total pressure of the gas has been the summation of the partial pressure of each gas present in the mixture.
Total pressure = Partial pressure of A + Partial pressure of B + Partial pressure of C……
The given mixture has been consisted of neon and krypton. The total pressure of the mixture has been:
Total pressure = Partial pressure of Ne + Partial pressure of Kr
The total pressure = 1.60 atm.
The partial pressure of Ne = 0.40 atm.
Substituting the values:
1.60 atm = 0.40 atm + Partial pressure of Kr
Partial pressure of Kr = 1.60 - 0.40 atm
Partial pressure of Kr = 1.2 atm.
The partial pressure of Krypton in the mixture has been 1.2 atm.
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Can CBD product be harmful
Answers
scientists studying squirrels in a forest observed that the squirrel population decrease over a period of five years. which statement is the most likely explanation for the decrease in the population?
A) the death rate was greater that the birth rate.
B) the birth rate was equal to the death rate
C) the rate of immigration was equal to the rate of emigration
D) the rate of emigration was less than the rate of immigration
Answers
Answer:
b
Explanation:
Explain in words or using your diagrams how beryllium atoms would react with fluorine atoms.
Show clearly the outcome of the reaction and state the formula.
Answers
Explanation:
To delineate the the nature of the bonds that would be formed between the two elements, let us first write the electronic configuration of the two species;
Be = 2, 2
F = 2, 7
Beryllium is a metal with two valence electrons whereas fluorine is a halogen with seven valence electrons.
When Be loses two electrons it becomes isoelectronic with He;
Be → Be²⁺ + 2e⁻
Also, when fluorine gains an electron, it becomes isoelectronic with Ne;
F + e⁻ → F⁻
This loss and gain of electrons between the two elements creates an electrostatic attraction them and they enter into an electrovalent bond.
Hence;
Be²⁺ + 2F⁻ → BeF₂
If the earth's mantle were completely solid,__________ plates could not move around.
Answers
Answer:tectonic
Explanation:
Answer:
TECTONIC
Explanation:
What type of chemical reaction can be seen below?
C2H6 + O2 - CO2 + H2O
Answers
A nitride ion has 7 protons, 8 neutrons, and 10 electrons. What is the overall charge on this ion?
–3
–2
0
+3
Answers
Answer:
-3
Explanation:
Given parameters:
Number of protons = 7
Number of neutrons = 8
Number of electrons = 1 0
Unknown:
Overall charge on the nitride ion = ?
Solution:
The overall charge on an specie can be determined by;
Charge = number of protons - number of electrons
Charge = 7 - 10
Charge = -3
A nitride ion has 7 protons, 8 neutrons, and 10 electrons. –3 is the overall charge on this ion. Therefore, the correct option is option A.
What is ionic charge?
Ionic force An ion's electrical charge is produced when a number of electrons from a single atom or set of atoms are gained (creating a negative charge) or lost (creating a positive charge). Mineral bonding strength is significantly influenced by ionic charge (for instance, Fe3+ forms a stronger link than Fe2+ with identical ions).
Which elements inside a crystal lattice can be substituted for one another. Electrostatically applied opposite charges provide the ionic connection between ions. MgO is the final form of magnesium oxide. A nitride ion has 7 protons, 8 neutrons, and 10 electrons. –3 is the overall charge on this ion.
Charge = number of protons - number of electrons
Charge = 7 - 10
Charge = -3
Therefore, the correct option is option A.
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what is the total number of electrons found in the valence shell of noble gas in the ground state?
Answers
Answer:
eight
Because the noble gases are the least reactive of all elements, their eight valence electrons are used as the standard for nonreactivity and to explain how other elements interact.
Explanation:
12. The following represents two substances by showing only one molecule 1 point
of each substance. A chemical reaction occurs when hydrogen chloride
and sodium hydroxide are combined. Which of the following represents the
molecules that are the products of the chemical reaction?*
A.
B.
C.
D
Answers
Answer:
b
Explanation:
etbhte4bt4ebhgetbv
The ionization energies for removing successive electrons from sodium are 496 kJ/mol, 4562 kJ/mol,
6912 kJ/mol, and 9544 kJ/mol. The great jump in ionization energy after the first electron is removed
indicates that
Select one:
O a. sodium has four or five electrons.
O b. the atomic radius has increased.
c. a d-electron has been removed.
d. the noble gas configuration has been reached.
Answers
Answer:
D
Explanation:
The high jump of ionization energy indicates that we are trying to remove electron from noble gas configuration state.
The ionization energy data specifies that the Elements are from group 1 at period 3 or greater.
Removing the first electron require 496 kJ and the second ionization energy jump significantly due to the removal of electron from the noble gas configuration which is logical because electron try to maintain the especially stable state.
Carbon dioxide and ____ are outputs of cellular respiration
Answers
Answer:
oxygen
Explanation:
plants use oxygen
a student places a small stone with a mass of 5 g into a graduated cylinder containing 50 mL of water. With the stone in the graduated cylinder, the water rises to 75 mL. What is the density of the stone?
Answers
Answer:
The answer is 0.2 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
volume = final volume of water - initial volume of water
volume = 75 - 50 = 25 mL
We have
[tex]density = \frac{5}{25} = \frac{1}{5} \\ [/tex]
We have the final answer as
0.2 g/mLHope this helps you
Outline the two main observations that led Wegener to propose the theory of continental drift.
Answers
Answer:
for continental drift included the fit of the continents; the distribution of ancient fossils, rocks, and mountain ranges; and the locations of ancient climatic zone
Explanation:
Why is DNA important in living organisms?
Answers
Answer:
DNA is a vital for all living beings even plants.
Explanation:
It is important for inheritance, coding for proteins and the genitic instruction guide for life and its processes. DNA holds the instruction for an organisms or each cells development and reproduction and ultimately death.
What happens if you overmix muffins?
Answers
Answer: When you overmix the muffin batter, it crushes the air bubbles and ruins the fluffy texture.
Explanation: → Follow this tip: To ensure a batch of light, fluffy muffins, mix the dry ingredients with the wet ingredients until just barely combined, and no more dry flour is visible.
Which object absorbs the most sound waves?
O A. Tissue paper
O B. Air
O C. Earplugs
O D. Water
Answers
Answer:
Earplugs
Explanation:
Because sound waves absorb most sound, the sound is coming from the earplugs which creates the most sound waves rather than water, tissue paper, and air. Hope i helped :)
Answer:
Earplugs
Explanation:
Which of the following converts chemical energy = kinetic energy electrical energy?
Answers
Answer:
electrical energy is used to produce chemical energy.
Explanation:
What is the smallest substance? molecule mixture compound
Answers
Answer:
Molecule is the smallest i took the quiz and it was that!
Explanation:
Hope I helped! :>
Which of the following is a chemical property?
A:
mass
B:
oxidizes in air
C:
boiling point
D:
solubility
Answers
The formula for table salt is NaCl. When asked to name the compound in class, you notice one of your classmates typed "sodium chlorine" in the chat. Explain why this answer is incorrect.
Answers
Answer:
It should be Sodium Chloride
Explanation:
Sodium chloride, regular table salt, is also known as the mineral halite. The diagram to the right shows how sodium and chlorine atoms pack tightly together to form cube-like units of the compound NaCl. Crystals of table salt imitate this structure-they're shaped like little cubes.
Date
Page
1. An organic compound is found to contain the
following constituents :
C = 33.8%. H = 4.7%., N - 13:2%, Cl= 33.4%
and rest is Oxygen. Determine its empirical mass?
Answers
Emperical formula
C₃H₅NClO
Further explanationThe empirical formula is the smallest comparison of atoms of compound =mole ratio of the components
The principle of determining empirical formula
Determine the mass ratio of the constituent elements of the compound. Determine the mole ratio by by dividing the percentage by the atomic massmole ratio :
C[tex]\tt \dfrac{33.8}{12}=2.82[/tex]
H[tex]\tt \dfrac{4.7}{1}=4.7[/tex]
N[tex]\tt \dfrac{13.2}{12}=1.1[/tex]
Cl[tex]\tt \dfrac{33.4}{35.5}=0.94[/tex]
O[tex]\tt \dfrac{14.9}{16}=0.93[/tex]
we divide by the smallest mole ratio (0.93)
C : H : N : Cl : O =
[tex]\tt \dfrac{2.82}{0.93}\div \dfrac{4.7}{0.93}\div \dfrac{1.1}{0.93}\div \dfrac{0.94}{0.93}\div \dfrac{0.93}{0.93}\\\\3\div 5\div 1\div 1\div 1[/tex]
Emperical Formula :
[tex]\tt C_3H_5NClO[/tex]
difference between molar mass and molecular mass?
Answers
Answer:
In chemistry the substance is usually measured using molecular mass and molar mass. They are very important concepts in chemistry. Expression of molar mass is grams per mole.
...
Molar mass:
Difference between Molar mass and Molecular mass
Measurement given to compounds, atoms or molecules Determined only in molecules
Explanation:
hope the answer was helpful
What evidence supports a scientist's conclusion that fossil B is older than fossil A? (4 points)
a
Fossil A and fossil B were both found at the same depth below Earth's surface.
b
Fossil B was found at a depth of 185 meters below Earth's surface, while fossil A was found at a depth of 50 meters below Earth's surface.
c
Fossil B was found at a depth of 50 meters below Earth's surface, while fossil A was found at a depth of 185 meters below Earth's surface.
d
Fossil A was found below Earth's surface, while fossil B was found at surface level.
Plz help need this fast!
Answers
Answer:
Choice B, as time goes on the surface level rises and stuff buried underground gets further and further below surface level.
Which types of mechanical weathering are most likely represented below?
A. A) Salt weathering, B) root wedging, C) pressure release, D) lichen growth
B. A) Heat expansion, B) lichen growth, C) salt weathering, D) abrasion
C. A) Abrasion, B) root wedging, C) heat expansion, D) salt weathering
D. A) Frost wedging, B) root wedging, C) salt weathering, D) heat expansion
Answers
The type of mechanical weathering that is most likely represented below is A) Frost wedging, B) root wedging, C) salt weathering, and D) heat expansion. The correct option is D.
What is mechanical weathering?Mechanical weathering is a rock that can be broken apart mechanically by processes like ice solidifying in fractures in the rock, and tree roots sprouting in those same crevices.
Rock expanding and contracting in locations with high daytime temperatures and low overnight temperatures, rock cracking during forest fires, and so on. Salt weathering is a different kind of mechanical weathering. It functions similarly to how freeze-thaw weathering does. When sea salt spray enters a rock fissure, salt weathering occurs.
Therefore, the correct option is D. A) Frost wedging, B) root wedging, C) salt weathering, and D) heat expansion.
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Hydrogen is considered to be a (metal, non-
metal) of relatively (high, low) electronega-
tivity.
1. nonmetal; low
2. nonmetal; high
3. metal; low
4. metal; high
Answers
Answer:
the answer is 1. nonmetal; low
6 . Label the illustration below.
A
D
С
У
X
B
A
B.
C
Answers
Answer:
Where is the illustration?
Explanation:
what does buffer do?? (Chemistry)
Answers
Answer:
C, It resists a change in pH when H+ or OH is added to a solution.
Explanation:
a p e x
A graduated cylinder has a radius of 1.0 45 cm and a height of 30.48 CM what is the volume of a cylinder in centimeters to the power of 3
Answers
Bdbddbdnnrndnden
Explanation:
BdbddbdnrnrnrndnrnrnrnrjrjrnrrnrnrjrjrBdbddbnrrnnrrnrnrnrnrnrjrjrrnnrnrnrdjrnrnrndndndnrn
A hockey player is wearing ice skates and pushes against the wall propelling her backward on the ice. According to Newton's third law of motion, which of the following best compares the forces acting between the wall and the hockey player?
A.
The forces are equal and applied in the same direction.
B.
The forces are different sizes and applied in the opposite direction.
C.
The forces are equal and applied against gravity.
D.
The forces are equal and applied in the opposite direction.
Answers
its D
random characters AAAJIJRIAJKLGIJHEOGEINDKIKAN
