Answers
Answer:
Cobalt
Explanation:
From the question given above, the following data were obtained:
Electronic configuration of element => 1s² 2s²2p⁶ 3s²3p⁶ 4s²3d⁷
Name of the Element =?
Next, we shall determine the number of electrons in the atom of the element. This can be obtained as follow:
Number of electron = 2 + 2 + 6 + 2 + 6 + 2 + 7
Number of electron = 27
Next, we shall determine the number protons in the atom of the element. This can be obtained as follow:
For a ground state element,
Number of Proton = number of Electron
Number of electrons = 27
Number of proton = Number of electron = 27
Number of protons = 27
Therefore, the number of protons in the atom of the element is 27
Next, we shall determine the atomic number of the element. This can be obtained as follow:
The atomic number of an element is simply the number of protons in the atom of the element. Mathematically,
Atomic number = proton number
Number of proton = 27
Finally, we shall determine the name of the element as follow:
Comparing the atomic number of the element (i.e 27) with those in the periodic table, the element is Cobalt since no two elements have the same atomic number.
Related Questions
Consider the statement below.
“When nitrogen is liquefied, heat is released.”
Is this statement true or false?
It is false because nitrogen absorbs heat when it is liquefied.
It is false because nitrogen cannot absorb enough heat to liquefy.
It is true because heat is released when a gas changes to a liquid.
It is true because heat is released when a liquid changes to a gas.
Answers
The statement, that describes when nitrogen is liquefied, heat is released is "it is true because heat is released when a gas changes to a liquid."
What is heat released?Heat is used to release energy in some chemical reactions. In other words, they radiate heat into the environment.
The energy generated when a gas condenses to a liquid is known as latent heat of condensation. Condensation is the transformation of a gas into a liquid.
When steam is cooled, it releases thermal energy and transforms into a liquid. This is known as condensation.
Heat must be removed in the given statement to transform gaseous nitrogen to liquid nitrogen.
Hence the correct option is C.
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Which option is an element
Carbon dioxide
Air
Water
Carbon
Answers
Answer: Carbon is the only element listed. Carbon Dioxide consists of Carbon AND Oxygen x2 so this is a compound. As stated earlier, air is a mixture of compounds. Water is another compound consisting of Hydrogen x2 and Oxygen.
Explanation: pls give brainliest thanks!
An element is made up of atoms with the same atomic number.
Carbon is the only element listed.
What does element mean?Element, A substance that cannot be broken down chemically into simpler substances. An element is made up of atoms with the same atomic number, which means that each atom has the same number of protons in its nucleus as the other atoms in the element. water is a compound. The concept of water atoms does not exist. Water molecules are composed of hydrogen and oxygen atoms in the exact ratio of two hydrogens to one oxygen.air is a mixture rather than a compound: By fractional distillation of liquid air, air can be separated into its constituents such as oxygen and nitrogen.To learn more about : Element
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If a student is titrating 10.0 mL of 1 M HNO3 with 1M NaOH and another students is titrating 10.0 mL of 1 M H2SO4 with 1 M NaOH, would they need the same volume of NaOH to reach the equivalence point? Explain your answer.
Answers
Given the two different titration reactions, the volume of NaOH required to reach the equivalence point of both reaction will be different.
Titration of HNO₃ and NaOHBalanced equation
HNO₃ + NaOH —> NaNO₃ + H₂O
From the balanced equation above,
The mole ratio of the acid, HNO₃ (nA) = 1The mole ratio of the base, NaOH (nB) = 1How to determine the volume of NaOHVolume of acid, HNO₃ (Va) = 10 mL Molarity of acid, HNO₃ (Ma) = 1 MMolarity of base, NaOH (Mb) = 1 MVolume of base, NaOH (Vb) =?MaVa / MbVb = nA / nB
(1 × 10) / (1 × Vb) = 1
10 / Vb = 1
Cross multiply
1 × Vb = 10
Vb = 10 mL
Titration of H₂SO₄ and NaOHBalanced equation
H₂SO₄ + 2NaOH —> Na₂SO₄ + 2H₂O
From the balanced equation above,
The mole ratio of the acid, H₂SO₄ (nA) = 1The mole ratio of the base, NaOH (nB) = 2How to determine the volume of NaOHVolume of acid, H₂SO₄ (Va) = 10 mL Molarity of acid, H₂SO₄ (Ma) = 1 MMolarity of base, NaOH (Mb) = 1 MVolume of base, NaOH (Vb) =?MaVa / MbVb = nA / nB
(1 × 10) / (1 × Vb) = 1/2
10 / Vb = 1/2
Cross multiply
1 × Vb = 10 × 2
Vb = 20 mL
Conclusion Titration of HNO₃ and NaOH required 10 mL of NaOH Titration of H₂SO₄ and NaOH required 20 mL of NaOHFrom the above calculations, we can conclude that different volume of NaOH will be required for the different reaction.
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What are the advantages of using moringa in water purification?
Nonsense = report
Best answer = brainliest
Answers
Answer:
moringa tree has seeds that have unique properties towards water purification
Explanation:
the seeds of moringa tree have an extract which can separate unwanted particulates from the water sediment impurities.
they have the
anti-microbial treatment potentials
moringa also has various vitamins since it is a plant tissue
How many atoms are in 3.5 L of Neon at STP? Show your work!
Answers
Answer:
the answer to the question is 0.1734
Explanation:
3.5g=1mole of Ne/20.18g
=0.1734
What is the compound name of CrS3?
Answers
Answer:
Chromium (VI) sulfide
Explanation:
It is an ionic bond, hence the roman numeral.
Calculate the pH when 60.0 mL of 0.200 M HBr is mixed with 30.0 mL of 0.400 M CH₃NH₂ (Kb = 4.4 × 10⁻⁴).
Answers
When a volume of 60.0 mL of 0.200 M HBr is mixed with a volume of 30.0 mL of 0.400 M CH3NH2, The pH value is mathematically given as
pH=10.64
What is the pH value when 60.0 mL of 0.200 M HBr is mixed with 30.0 mL of 0.400 M CH₃NH₂?Question Parameters:
The pH when 60.0 mL of 0.200 M HBr
30.0 mL of 0.400 M CH₃NH₂ (Kb = 4.4 × 10^{-4}).
Generally, the equation for the Chemical Reaction is mathematically given as
H Br + H_3C NH_2----- > CH_3 NH_3 Br
Therefore
oH=p^{kb}+-log[tex]\frac{salt}{base}[/tex]
OH=-log(4.4*10^{-4})+[tex]\frac{0.1}{0.1}[/tex]
OH=3.36
In conclusion, The equation pH value
pH+OH=14
Therefore
pH+=14-3.36
pH=10.64
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If you had a bag with 200 atoms of Krypton in it, how many of them would be Krypton-83?
Answers
Answer:
23 atoms
Explanation:
Krypton (Kr) exists naturally as a mixture of six isotopes with atomic number of 36. These six isotopes occupy different percentages of the mixture. Below is a list of the isotopes and there percentage in a given mixture
1) Krypton-78 (⁷⁸Kr) ⇒ 0.35%
2) Krypton-80 (⁸⁰Kr) ⇒ 2.25%
3) Krypton-82 (⁸²Kr) ⇒ 11.6%
4) Krypton-83 (⁸³Kr) ⇒ 11.5%
5) Krypton-84 (⁸⁴Kr) ⇒ 57%
6) Krypton-86 (⁸⁶Kr) ⇒ 17.3%
To determine the amount of ⁸³Kr present in a mixture of 200 atoms of krypton, you will multiply the it's percentage of occurrence in nature by the amount of atoms in a given mixture
11.5/100 × 200 = 23 atoms
Hence, there should be 23 atoms of krypton-83 in the mixture of 200 atoms of Krypton.
What is most plastic made of?
A) synthetic materials
B) carbon containing compounds
C) inorganic compounds
D) organic compounds
E) petroleum or coal materials
Answers
You wish to make a 0.358 M hydroiodic acid solution from a stock solution of 3.00 M hydroiodic acid. How much concentrated acid must you add to obtain a total volume of 50.0 mL of the dilute solution?
Answers
Working:
Formulas:
N=cv
So if
0.358 M=c*50.0ml
C= 0.358/50
This is the concentration of ur final solution
Now take the concentration and 3.00M and find volume.
This is bc u have the mol of that and concentration so how much is in it
So
3.00M= (0.358/50) * v
Solve for v
That’s ur answer
please help me i’m in need!
Answers
Answer:
balanced............
When an experimenter draws a conclusion that he assumes will apply to all situations set up similarly to his test situation, even though he cannot possibly have examined all possible test scenarios, the experimenter is using _____.
a) inductive reasoning
b) abductive reasoning
c) deductive reasoning
d) subjective reasoning
Answers
Answer: A, inductive Reasoning
Explanation: I got the answer right on my homeschooling program, the rest are all wrong
ASAP HELP ME!! Which of the following does the ocean provide?
Question 1 options:
Over half the oxygen we breathe
Climate regulation
Pollution
Food and medicine
Answers
The oceans are fundamental because provide oxygen, climate regulation, and food and medicines.
What are ocean resources?The term ocean resources make reference to the sources of energy and materials obtained from the ocean.
The ocean produces more than 50% oxygen we can breathe from the air and also absorbs carbon dioxide.
The ocean is also fundamental in climate regulation to dissipate heat from the equator to the North and South poles.
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Calculate the percentage of water in C2 H4O2.2H2O
Answers
Answer:
[tex]Molecular \: mass \: of \: C _{2}H _{4} O_{2}.2H_{2}O , \\ \\ ⇢ 12 \times 2 + 4 \times 1 + 16 \times 2 + 2(2 \times 1 + 16) \\ \\⇢ 24 + 4 + 32 + 36 \\ \\ ⇢ 96g[/tex]
[tex]\bold\pink{Percentage \: of \: substance \: in \: compound ,} \\ \\ \bold\pink{ ⇢ \frac{mass \: of \: substance}{mass \: of \: compound \times 100}}[/tex]
[tex]\%\:age \: of \: water \: (H_{2}O) = \frac{36}{96} \times 100 \\ \\ ⇢ 0.375 \: \times 100 \\ \\\fbox\red{\: ⇢ 37.5\%\:}[/tex]
hope helpful ~
What is the molecular shape of a Cl2CO molecule?
A) Linear
B) Tetrahedral
C) Trigonal planar
D) Trigonal pyramidal
E) Bent
Answers
Example: O=CCl2, otherwise known as the early chemical warfare agent Phosgene is SP2 hybridized about the carbon atom, thus it is "trigonal planer" in molecular geometry terms. Here's a ball & stick model with oxygen (red) double bonded to the carbon atom.
The molecular shape of a Cl₂CO molecule is (E) Bent. Option E
molecular shape of a Cl₂CO moleculeCl₂CO, which is also called carbonyl chloride or phosgene, is a molecule made up of one carbon atom (C), two chlorine atoms (Cl), and one oxygen atom (O) attached to the carbon atom. The Lewis structure of Cl₂CO shows that the oxygen atom has two sets of unshared electrons. This makes the molecule have a curved shape.
The reason why Cl₂CO has a bent shape is because the lone pairs on the oxygen atom push the bonded atoms away more than the shared pairs of electrons. Because of this, the two Cl atoms move closer to each other. This causes the bond angle to be less than 180 degrees and makes the molecule have a bent shape.
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Which of the following is a solution?
Salt water
Milk
Muddy water
Chlorine
Answers
Answer:
salt water
Explanation:
i learned from makeing slime
Answer:
C: Chlorine
Explanation:
Which change of state involves a release of energy?
boiling
condensation
melting
sublimation
Answers
Answer:Condensation
Explanation:I just took it:/
The phase changes occur when the substances undergoes transition between different states of matter. All phase changes involve either gain or release of energy. Here condensation involves a release of energy. The correct option is B.
What is condensation?The process through which the physical state of matter changes from the gaseous phase into the liquid phase is defined as the condensation. The condensation occurs when water vapor in the air changes into liquid water when it comes in contact with a cooler surface.
During condensation molecules in the gaseous state release energy to change state to a liquid. The opposite of the condensation is the evaporation. At high pressure and low temperature any gas can condense.
Condensation is also important to the water cycle as it is responsible for the formation of clouds and maintains water balance.
Thus the correct option is B.
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When a liquid becomes a gas the process is called
Answers
Answer:
Evaporation
Explanation:
Evaporation is a process of water changing into vapor when heated.
The process is called evaporation
What is 100.000 divided multiplied by 60.90 - 3455 + 29180? Make it right please!
Answers
Answer: Thx brother!
Explanation: He let me have points!
Answer:
31815
Explanation:
did it on a calculator lol
The better we measure the better things ____
Answers
Don't look in the comments
Consider the reaction below. Which of the following would increase the partial pressure of B at equilibrium?
A (s) + B (g) ⇌ C (g) ΔH < 0
Answer Options:
A. adding A.
B. increasing the total volume of the container.
C. Increasing the temperature.
D. Removing C.
Answers
Answer:
Increasing the temperature
Partial pressure is the pressure exhibited by a single gas when present alone in a system. According to Le's principle, the partial pressure of B can be raised by increasing temperature. Thus, option C is correct.
What is Le's principle?
Le's principle states the shift in the position of the equilibrium when the reaction system is disturbed by some factors. The pressure, temperature, and concentration are the factors that affect the equilibria of the reaction mixture.
According to the ideal gas equation and Le's principle, the pressure of the system directly depends on the temperature. As the temperature of the system is raised the partial pressure of the reactant (B) will increase, and the reaction will move in the forward direction.
Therefore, the increase in the temperature increases the partial pressure of the gas.
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What is the position of the dog
Answers
Answer:
what dog
Explanation:
you did not show a dog
5. What is total number of heat energy required to completely boil 100.0 g of water at 100.0
°C and 1 atm?
Need help this one is due 11:59 tonight
Answers
Answer:4.2J/(g.°c)
I hope this helps
Explanation:
A hydrogen atom absorbs a photon of visible light and its electron enters the n = 4 energy level. Calculate the change in energy of the atom and the wavelength (nm) of the photon.
Answers
Calculate the atomic mass of indium if inLithium-6 is 4% abundant and lithium-7 is 96% abundant.
Answers
Answer:
:)
Explanation:
WILL GIVE BRAINLIEST
which statement describes all chemical changes but not physical changes
Answers
Answer:
answer is b
Explanation:
Use the balanced equation to answer the question.
2 C2H6(g) + 5 O2(g) delta 4 CO(g) + 6 H2O(g)
How many moles of H2O are formed from 0.60 moles of C2H6?
Answers
Answer:
1.8 moles of H20
Explanation:
The balanced equation gives you the ratio of moles.
so you then have to say the number of moles of the substance you have multiplied by the the ratio of what you are looking for to what you have.
The ratio should be written in the form of a/b (fraction)
0.90 moles of H₂O are formed from 0.60 moles of C₂H₆.
From the balanced equation, we can see that the stoichiometric ratio between C₂H₆ and H₂O is 2:6. This means that for every 2 moles of C₂H₆ reacted, 6 moles of H₂O are formed.
Given that we have 0.60 moles of C₂H₆, we can use this ratio to calculate the corresponding moles of H₂O.
(0.60 moles C₂H₆) x (6 moles H₂O / 2 moles C₂H₆) = 1.80 moles H₂O
Therefore, 0.60 moles of C₂H₆ will produce 1.80 moles of H₂O according to the stoichiometry of the balanced equation.
However, it's worth noting that the given balanced equation doesn't match the stoichiometry usually seen for the combustion of ethane (C₂H₆). The typical balanced equation for the complete combustion of ethane is:
C₂H₆ + 7/2 O₂ -> 2 CO₂ + 3 H₂O
In this case, 0.60 moles of C₂H₆ would produce 0.90 moles of H₂O according to the stoichiometry of the balanced equation.
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The enthalpy of reaction for the combustion of C to produce CO2(g) is -393.5 kJ/mol and the
enthalpy of the reaction of CO to produce CO2 is -283.0 kJ/mol as shown in the reactions:
(1) C(S) + O2(g) CO2(g) H=-393.5 kJ
(2) CO(g) + 1/2O2(g) CO2(g) H=-283.0 kJ
Based on these data, calculate the enthalpy of combustion of C to produce CO:
(3) C(S) + 1/2O2(g) CO(g) H=?
Answers
The enthalpy of combustion of C to produce is mathematically given as
dHo rxn = -110.5 KJ
What is the enthalpy of combustion of C to produce?
Question Parameters:
the combustion of C to produce CO2(g) is -393.5 kJ/mol
the reaction of CO to produce CO2 is -283.0 kJ/mol
The Hess lawHess's law states that during a chemical reaction any change in the enthalpy of a chemical reaction is identical nonetheless, not regarding if the reaction takes place in one step or several steps, so far we have similar final and the initial states.
Generally, the equation for the reaction 3 is mathematically given as
reaction 3 = +1 * (reaction 1) -1 * (reaction 2)
Therefore
dHo rxn = +1 * (-393.5) -1 * (-283.0)
dHo rxn = -110.5 KJ
In conclusion, the enthalpy of combustion is
dHo rxn = -110.5 KJ
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. Anthony proposed an experiment during which he would test the friction created when a skateboard is rolled along a flat surface. He selected three different surfaces (carpet, tile, and concrete) each with three different textures (dry, wet, and icy). His teacher told him that he would need to clarify his experiment before his project would be approved. Which of the following best describes why Anthony's project was rejected? A. Anthony's project has two independent variables. B. Anthony does not have a problem that can be tested. C. The skateboard will not be able to roll along the carpet. D. The friction created by a skateboard cannot be measured.
Answers
Answer:D
Explanation:I think
Which method is the best way to separate a mixture of recycled glass and iron
Answers
Answer:
Use a magnet
Explanation:
Magnet will pull out the iron and the glass will remiain there
Answer: Sorting by magnetism
Explanation: quiz