Answer:
You can not make the observation in the lab
Explanation:
We must know the amount of Nitrogen-16 that remains after 57 seconds before we can make our conclusion.
Hence, from;
N/No = (1/2)^t/t1/2
Where;
N = amount of Nitrogen-16 present after 57 seconds
No = 100g of Nitrogen-16 originally present
t = 57 seconds
t1/2 = half life of Nitrogen-16 which is 7.13 seconds
Substituting values;
N/100 = (1/2)57/7.13
N/ 100 =(1/2)^8
N/100 = 1/256
256N = 100
N = 100/256
N = 0.39 g
You can not make the observation because you need at least 5g of Nitrogen-16 and only 0.39 g is left after 57 seconds.
The minimum amount of sample required has been 5 grams, while the remaining sample has been 0.39 grams. Thus, it has not been possible to make the observations.
The half life can be defined as the time required for the sample to reduce to half of its initial concentration. The half life can be given as:
Amount remained = Initial amount [tex]\rm \times\;\dfrac{1}{2}^\dfrac{time}{Half-life}[/tex]
The half life of nitrogen 16 has been 7.13 second.
The initial concentration of the sample has been 100 grams.
The concentration of sample remained after 57 seconds has been:
Amount remained = 100 [tex]\rm \times\;\dfrac{1}{2}^\dfrac{57\;sec}{7.13\;sec}[/tex]
Amount remained = 0.39 grams.
The amount of sample remained after 57 seconds has been 0.39 grams.
The amount of sample required for the analysis has been 5 grams, after 57 seconds only 0.39 grams of sample has been remaining. Thus, the student will not be able to made analysis of nitrogen-16.
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5.
The reaction 2AB 2A + B is first order with respect to AB.
The half-life of the reaction is 2 minutes.
0.100 mol of AB is dissolved in a solvent to form 100 cm of a reaction mixture.
What is the concentration of AB, in mol dm, after 6 minutes?
A. 0.0125
B. 0.0250
CU 0.125
D. 0.250
[1]
Your answer
The concentration of AB, in mol/dm³, after 6 minutes : 0.125
Further explanationFor first-order reaction :
[tex]\tt [A]=[A]oe^{-kt}\rightarrow t1/2=\dfrac{ln~2}{k}[/tex]
The half-life of the reaction is 2 minutes⇒t1/2=2 minutes
The concentration of AB, in mol dm, after 6 minutes ⇒ t=6 minutes
The rate constant (k) :
[tex]\tt k=\dfrac{ln~2}{t1/2}=\dfrac{0.693}{2}=0.3465[/tex]
The concentration after 6 minutes :
[tex]\tt [A]o=0.1~mol/100~cm^3=1~~mol/dm^3\\\\(A]=1\times e^{-0.3465\times 6}\\\\(A]=0.125[/tex]
Describe the preparation of
2.ool of o. 108M Bacl2 from
Bacl2.2HO (244.3 /mol)
Answer:
We have to weigh 52.8 g of BaCl₂·2H₂O, add it to a 2.00 L flask and add water until reaching the final volume.
Explanation:
Describe the preparation of 2.00 L of 0.108 M BaCl₂ from BaCl₂·2H₂O. (244.3 g/mol).
Step 1: Calculate the moles of BaCl₂
We need to prepare 2.00 L of a solution that contains 0.108 moles of BaCl₂ per liter of solution.
2.00 L × 0.108 mol/L = 0.216 mol
Step 2: Calculate the moles of BaCl₂·2H₂O that contain 0.216 moles of BaCl₂
The molar ratio of BaCl₂·2H₂O to BaCl₂ is 1:1. The moles of BaCl₂·2H₂O required are 1/1 × 0.216 mol = 0.216 mol.
Step 3: Calculate the mass corresponding to 0.216 mol of BaCl₂·2H₂O
The molar mass of BaCl₂·2H₂O is 244.3 g/mol.
0.216 mol × 244.3 g/mol = 52.8 g
We have to weigh 52.8 g of BaCl₂·2H₂O, add it to a 2.00 L flask and add water until reaching the final volume.
If 100. mL of 0.100 M K2SO4 is added to 200. mL of 0.150 M KCl, what is the concentration of K + ions in the final solution? Assume that the volumes are additive.
The final concentration will be "0.167 M".
According to the question,
Moles of KCl,
[tex]0.15\times 200\times 10^{-3}[/tex]Moles of K₂SO₄,
[tex]0.1\times 100\times 10^{-3}[/tex]Total moles of K+ will be:
= [tex]0.15\times 200\times 10^{-3}+2\times 0.1\times 100\times 10^{-3}[/tex]
Total volume will be:
= [tex](100+200) \ mL[/tex]
hence,
→ The final concentration of K+ will be:
= [tex]\frac{Total \ moles}{Total \ volume}[/tex]
= [tex]\frac{0.05}{300}\times 100[/tex]
= [tex]\frac{0.5}{3}[/tex]
= [tex]0.167 \ M[/tex]
Thus the above solution is correct.
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explain how to convert the moles to litters and litters to moles
invenstigatory project potato battery research questions
Answer:
My hypothesis is that: If the electrolyte source is changed (potato, apple, lime, lemon), then the production of energy (measured in volts) using a lemon will produce the highest voltage because the acid content in the fruit or vegetable will produce electricity when in contact with the electrodes (both zinc and copper
Explanation:
(01.05 LC)
Which of the following is an example of a chemical change? (4 points)
Select one:
O
a.Boiling water
b.Burning paper
c. Dissolving sugar in water
d.Melting gold
Fill in the blanks: Repeating an experiment several times and averaging the results helps to reduce ___ ___
Answer:
the amount of mistakes?
Explanation:
A piece of silver wire has a mass of 53.91 grams. How many moles of
silver are in the wire?
89 year old toys girl who have some starter pets plez im new
(SK015) Naturally occurring argon consists of thre isotopes , argon-36, argon-38, argon-40 in the ratio of 4.86: 1 : 1423 i) Calculate the percentage composition of the three isotopes. ii) Calculate the relative atomic mass of argon to four significant figures.
Answer:
What
Explanation:
Can u explain
What purpose is served by
including information about Aristotle
and the experiments of the ancient
Greeks?
Aristotle laid the philosophical groundwork for all subsequent discussions of elements, pure substances, and chemical combinations.
The nature of substances and their transformations were the main topics of Aristotle's theories, just like in contemporary chemistry. In On Generation and Corruption (De Generatione et Corruptione), Meteorology, and portions of Physics and On the Heavens, he provided the first systematic treatments of chemical theory (De Caelo).
Although he believed that some of them might be made of a single, pure component, Aristotle realized that the majority of common, tangible things are composed of several different substances. In order to identify a single substance, he needed to provide a purity standard. His standard was the homoeomerism of pure substances, which means that they are made up of similar components at all levels.
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What did the Bohr model assume about the motion of electrons?
A. All electrons move in a circular orbit around the nucleus.
B. Electrons do not have a specific path around the nucleus.
C. All electrons move in a single cloud layer around the nucleus.
D. Electrons always remain in the same location around a nucleus.
Answer:
A
Explanation:
Bohr proposed that an electron is found only in specific circular paths, or orbits, around the nucleus
Help me pls Do In A HOUR 8th grade science,
Some street lights use incandescent bulbs, and others use LEDS. Which would you recommend and why?
Answer:
I would reccomend LED's because they use much less energy than incandescent bulbs
who was the modern astronomer who provided insight into inertia through careful experiments
The modern astronomer who provided insight into the physical phenomena of inertia through careful experiments was Galileo Galilei, who showed by empirical evidence the heliocentrism to left in the past the erroneous earthcentrism idea.
Who was Galileo Galilei?Galileo Galilei was one of the most important astronomers in history who showed through careful experimentation that the Earth orbit around the Sun, which is known as heliocentrism.
In conclusion, the modern astronomer who provided insight into the physical phenomena of inertia through careful experiments was Galileo Galilei, who showed by empirical evidence the heliocentrism to left in the past the erroneous earthcentrism idea.
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You are asked to make a buffer solution with a pH of 10 (ignore temperature effects), with a final concentration of 0.1 M in 1.0L total volume. You are asked to use carbonic acid (H2CO3; MW = 62 g/mole) to make this buffer solution. The reported values for carbonic acid are pKa1 = 6.4 and pKa2 = 10.3. To make this solution you will first dissolve the acid in 800 mL of distilled water, then add a volume of 10 M NaOH, followed by additional distilled water to bring the volume up to 1.0L. Address the following:
A) How much carbonic acid do you add to make your desired solution (in grams)?
B) How much 10M NaOH do you add to obtain the desired pH?
C) Wait a minute, what if instead you are provided with a 0.2 M solution of NaHCO3 and 0.4 M solution of Na2CO3…then how would you make the solution? It should be the same pka values as carbonic acid.
D) Turns out you can only get the amino acid lysine (in acid form, fully protonated). Perform the same calculations for (A) and (B) using this molecule (how much to add, how much 10 M NaOH to add). I believe you can use any of the pka's that Lysine has, just use 2.
E) If you overshoot regarding the pH, that is say it’s at pH 11 vs. 10, then can you just add some HCl to bring the pH down or should you start all over? Why?
Consider a solution containing 10−5 M H2S(aq) and a constant dissolved oxygen concentration of 0.25 mM (8.0 mg/L). If the given reaction is the only way that 100 temperature.
What is temperature ?Temperature is a numerical expression of how hot (or energetic) stuff or radiation is.
There are three different types of temperature scales: those, like the SI scale, that are defined in terms of the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron, in a body; those that only depend on strictly macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are defined by practical empirical properties of particulates rather than by theoretical principles.
Using a thermometer, one can gauge temperature. It is calibrated using different temperature scales, each of which historically defined itself using a different set of reference points and thermometric materials.
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Glucose C6H12O6 is formed in plants during photosynthesis. The molar mass of glucose is:
Answer:
170
Explanation:
C=6×12=72
H=12×1 = 12
O=6×16=96
Molar mass=72+12+96
Molar mass=170
Answer:
180
Explanation:
C = 12
H = 1
O = 16
The molar mass of the glucose is
⇒ 12 x 6 + 1 x 12 + 16 x 6
⇒ 72 + 12 + 96
= 180
2H2O(l)2H2(g) O2(g) Using standard thermodynamic data at 298K, calculate the entropy change for the surroundings when 2.03 moles of H2O(l) react at standard conditions.
Answer:
The correct answer is -1946.89 j/K.
Explanation:
The reaction is:
2H2O (l) ⇔ 2H2 (g) + O2(g)
First there is a need to find dHfrxn = dHf(Products) - dHf(reactants)
With the help of standard thermodynamic table, the values of dHf can be obtained,
dHf(H2O) = -285.8 kJ/mol
dHf(H2) = 0 kJ/mol
dHf(O2) = 0 kJ/mol
dHrxn = 2 × dHf (H2) + dHf(O2) - 2 × dHf(H2O)
= 2 × 0 + 0-2 × (-285.8) kJ = +571.6 kJ
This value is for 2 moles of H2O, for 2.03 moles of H2O, the value will be,
dHrxn = +571.6 kJ/2 mol × 2.03 mol
= 580.174 kJ
The given temperature is 298 K.
So, the value of dSsurr = -dHrxn/T
= -580.174kJ/298 K
= -580174 j/298K
= -1946.89 j/K
How does a vase on a table overcome gravity? What would happen if you moved the vase off the table
Answer:
A vase on a table overcomes gravity because of the upwards force of the table against it, which is stronger than the force of gravity. If you were to move the vase off the table it would no longer have anything stopping gravity from breaking it.
Explanation:
Two soccer teams, the Bears and the Panthers, played games at the same time in two different locations. The Bears game was played at sea level, where there is a normal amount of oxygen. Before their game, the players on the Bears ate a lunch of mostly starch. The Panthers game was played at very high altitude, where there is less oxygen. The players on the Panthers ate a lunch of starch and protein. Which team probably did better in their game?
1 point
Answer:
Bears
Explanation:
because starch is heavy and it requires a lot of oxygen in an environment. so having starch in an environment with less oxygen could probably cause fatigue
In the reaction __S+3O2->2SO3 what coefficient should be placed in front of the S
to balance the reaction?
1
2
3
Answer:
i think 3
Explanation:
Answer:
Your answer Should be 2
Explanation:
because i need to flex my brain cells
g The heat capacity of a bomb calorimeter is: a negative quantity with units of kJ/mol a negative quantity with units of J/oC a positive quantity with units of kJ/mol a positive quantity with units of J/oC
Answer:
I believe it is a positive quantity such as water has 4.14 j/oC it is always positive it is the energy needed to raise the temperature by 1 degree celsius
Explanation:
Balance the following SYNTHESIS chemical reaction with the correct coefficients:
___Al (s) + ___S (s) --> ___Al2S3 (s)
a
1, 2, 3
b
2, 3, 1
c
1, 1, 2
d
3, 2, 1
Answer:
b 2,3,1
Explanation:
2 Al + 3 S ----> Al2S3
helppppppppppppppppppppppppppppppppppppppppppppppppppp
Answer:
C hydrogen and orange boxes element
Explanation:
Does you have more momentun when you are running 3 km/hr or when you are walking 1 km/hr? Explain your answer
What process do you think occurred in stars and supernovae to produce the atoms that make up everything on Earth?
Answer:
A big star collapsing creates a shock wave that can trigger fusion events in the star's outer shell, which is how I believe the process that took place in stars and supernovae to form the atoms that make up everything on Earth happened. Nucleosynthesis is the process by which these fusion processes produce new atomic nuclei. One of the primary sources of the universe's heavy elements is thought to be supernovae. It is possible to synthesize materials heavier than iron, such as uranium and gold, during a supernova because the star emits enormous amounts of energy and neutrons. All of these components are launched into space during the supernova explosion.
can someone help me?
Answer:
Heating water until it boils. The water particles would gain thermal energy from the heat source and there would be an increase in the kinetic energy between the water particles. During this stage, the temperature of the water particles remains the same as the thermal energy is used to break the strong bonds of attraction between the water particles so that they can be further apart and transition from the liquid state to the gas state.
Which best describes how magnesium (Mg) and oxygen (O) bond?
a
They form an ionic bond by exchanging two electrons.
b
They form an ionic bond by exchanging three electrons.
c
They form a covalent bond by sharing one electron.
d
They form a covalent bond by sharing four electrons.
Answer:
a
They form an ionic bond by exchanging two electrons.
Explanation:
Magnesium loses two electrons and oxygen gains these electrons so ionic bond is formed
The statement that best describes how magnesium (Mg) and oxygen (O) bond is, "they form an ionic bond by exchanging two electrons." This is further explained below.
What is bonding?Generally, bonding is the process of firmly connecting items together using adhesive, heat, pressure, or chemical bonding.
In conclusion, When magnesium (Mg) and oxygen (O) bond, they form an ionic bond by exchanging two electrons
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Describe the three main types of plate boundary interactions:
Divergent boundaries:
Convergent boundaries:
Transform boundaries:
Answer:
In the explanation
Explanation:
Divergent: When two plates are diverging from each other, meaning that the two plates are moving away from each other. Events that may occur include ridges or rifts.
Convergent: When two plates are moving towards each other.
If a continental plate and an oceanic plate are converging, the oceanic plate would slide underneath the continental plate since it is thinner. This would result in subduction, which means that part of the oceanic plate would hang underneath the continental plate, where magma can melt the hanging part.
If two continental plates are converging, the crash would result in mountains or volcanic activity. Magma could rise and rush from the crack. There would be a bump in these tectonic plates.
Transform: When two plates are sliding past each other. Earthquakes can occur when the plates are sliding. When an oceanic plate is involved, the movement of the plates could cause a tsunami as well. The water above the transform fault could rise, and grow bigger and bigger. The 2011 Japan Tsunami is a good example of this.
Hope this helps!
the specific heat capacity of water is 1 cal/gc how much heat in calories is released when 25.7 of water is cooled from 85 to 49
Answer:
The amount of heat that is released is -925.2 cal
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of heat that a body can receive or release without affecting its molecular structure, that is, it does not change the state (solid, liquid, gaseous). In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state.
The equation that allows to calculate heat exchanges is:
Q = c * m * ΔT
Where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature.
In this case:
c= 1 [tex]\frac{cal}{g*C}[/tex]m= 25.7 gΔT= Tfinal - Tinitial= 49 °C - 85 °C= -36 °CReplacing:
Q= 1 [tex]\frac{cal}{g*C}[/tex] *25.7 g* (-36 C)
Solving:
Q= -925.2 cal
The amount of heat that is released is -925.2 cal
PLEASE HELP!’
DUE IN 10 MINS
Answer:
The products are SnPO4 and LiC2H3O2
Explanation:
The reactants are LiPO4 + Sn(C2H3O2)2
This is a double replacement reaction
So what you do is switch the elements the other way around.
To do that, all you have to do switch Sn with PO4 since Sn is a cation and PO4 is an anion.
Then you switch Li with C2H3O2 because Li is a cation and C2H3O2 is an anion.
After that, check the charges. PO4 has -3 charge
So just leave Sn the way it is without a subscript.
In word form, the product would be Tin(III) Phosphate
C2H3O2 has a -1 charge Li has a +1 charge
So leave both of them the way it is without any subscripts.
In word form, the product would be Lithium Acetate
anybody know this ?? If so help ASAP .
Answer:
Mechanical Energy
Explanation:
Definition: Mechanical Energy The mechanical energy is
the sum of the kinetic and potential energies.