If you had a bag with 200 atoms of Krypton in it, how many of them would be Krypton-83?
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.
Which of the following is a solution?
Salt water
Milk
Muddy water
Chlorine
Answer:
salt water
Explanation:
i learned from makeing slime
Answer:
C: Chlorine
Explanation:
What is the molecular shape of a Cl2CO molecule?
A) Linear
B) Tetrahedral
C) Trigonal planar
D) Trigonal pyramidal
E) Bent
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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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.
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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WILL GIVE BRAINLIEST
which statement describes all chemical changes but not physical changes
Answer:
answer is b
Explanation:
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=?
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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What are the advantages of using moringa in water purification?
Nonsense = report
Best answer = brainliest
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
The better we measure the better things ____
Don't look in the comments
Silver chloride was reacted with magnesium hydroxide, in which magnesium displaced silver
ced the following reaction and state which one will form a precipitate.. (6mks)
Answer:
The precipitate is MgCl2Explanation:
The reaction that is described goes as follows:
2AgCl + Mg(OH)2 ---> MgCl2 + 2AgOH
The precipitate here is the MgCl2 salt.
I hope it helped!
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
Answer: A, inductive Reasoning
Explanation: I got the answer right on my homeschooling program, the rest are all wrong
________ are another name for the horizontal rows on the periodic table of
elements.
Answer:
I believe your answer would be Perio
Explanation:
Answer:
Periods :)
Explanation:
I dont know if thats what youre asking but thats what theyre called, there isnt another name
15.05 ml of a KOH solution neutralizes 25.6 mL of a 5.0 M H2SO4 solution. What is the concentration of the KOH solution?
Answer:
The concentration of KOH solution is 17.009 moles/litre or 17.009M .
Explanation:
Here , the given reaction is -
[tex]2KOH +H_{2}SO_{4}$\rightarrow$K_{2}SO_{4}+2H_{2}O[/tex]
2moles of KOH requires 1mole for complete neutralisation.
Therefore ,
2 x number of moles of KOH = 1 x number of moles of [tex]H_{2}SO_{4}[/tex]
2 x (molarity of KOH x volume of KOH) = (Molarity of [tex]H_{2}SO_{4}[/tex] x volume of
[tex]H_{2}SO_{4}[/tex])
1 mole of [tex]OH^- $\rightarrow$[/tex] 1mole of [tex]H^+[/tex]
Molarity (KOH) = concentration (c)
volume (KOH) =15.05ML
Molarity ([tex]H_{2}SO_{4}[/tex] ) = 5.0 M
Volume of ( [tex]H_{2}SO_{4}[/tex] ) = 25.6ML
[tex]\frac{1\times(C \times15.05ml)}{OH^-} = \frac{(2\times 25.6 \times 5)}{H^+}[/tex]
C = [tex]\frac{0.2\times25.6\times5}{15.05}[/tex]
C= 17.009 moles/litre
Hence , the concentration of KOH solution is 17.009 M or moles/litre .
please help me i’m in need!
Answer:
balanced............
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?
Which option is an element
Carbon dioxide
Air
Water
Carbon
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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What is 100.000 divided multiplied by 60.90 - 3455 + 29180? Make it right please!
Answer: Thx brother!
Explanation: He let me have points!
Answer:
31815
Explanation:
did it on a calculator lol
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.
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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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.
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 most plastic made of?
A) synthetic materials
B) carbon containing compounds
C) inorganic compounds
D) organic compounds
E) petroleum or coal materials
What is the matter can not be created or destroyed on changed from one form to another?
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
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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Which change of state involves a release of energy?
boiling
condensation
melting
sublimation
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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Calculate the percentage of water in C2 H4O2.2H2O
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 ~
Sort the properties of metalloids into the correct categories
brittle
Metallic Characteristics In-Between Characteristics
Nonmetallic
Characteristics
semiconducting
lustrous
solid at room temperature
amphoteric
metallic characteristics:
lustrous
solid at room temperature
in-between characteristics:
amphoteric
semiconducting
nonmetallic:
brittle
Explanation:
i took the instruction got then right :)
The metallic characteristics are lustrous, solid at room temperature
The in-between characteristics are amphoteric and semiconducting.
The nonmetallic characteristics is brittle.
What is metalloids?The elements whose properties are intermediate of metals and non-metals is called metalloid.
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Calculate the atomic mass of indium if inLithium-6 is 4% abundant and lithium-7 is 96% abundant.
Answer:
:)
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?
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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. 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.
Answer:D
Explanation:I think
questions simplify
x+2x+3x
hello ; i don't understand your answer Explanation:
Answer:
[tex]\huge\boxed{\sf 6x}[/tex]
Explanation:
[tex]\sf x+ 2x + 3x\\\\Take\ x\ common\\\\x(1+2+3)\\\\x(6)\\\\\bold{6x}\\\\ \rule[225]{225}{2}[/tex]
Hope this helped!
~AnonymousHelper18075. 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
Answer:4.2J/(g.°c)
I hope this helps
Explanation:
How many atoms are in 3.5 L of Neon at STP? Show your work!
Answer:
the answer to the question is 0.1734
Explanation:
3.5g=1mole of Ne/20.18g
=0.1734