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.
For more information about the sample decay, refer to the link:
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Long-wavelength infrared cameras detect infrared radiation with a wavelength of 1.0 x 10-5 meters. How much energy is in these waves? Talas
Answer: The energy of the infrared radiation is [tex]19.8\times 10^{-21}J[/tex]
Explanation:
The relationship between wavelength and energy of the wave follows the equation:
[tex]E=\frac{hc}{\lambda}[/tex]
E= energy
[tex]\lambda [/tex] = wavelength of the wave =[tex]1.0\times 10^{-5}m[/tex]
h = Planck's constant = [tex]6.626\times 10^{-34}Js[/tex]
c = speed of light = [tex]3\times 10^8m/s[/tex]
[tex]E=\frac{6.626\times 10^{-34}Js\times 3\times 10^8m/s}{1.0\times 10^{-5}m}[/tex]
[tex]E=19.8\times 10^{-21}J[/tex]
Thus energy of the infrared radiation is [tex]19.8\times 10^{-21}J[/tex]
PLEASE HELP
predict the product of the following reactants and the balance.
1. _______CuSO4+ _____NH4OH->
Answer:
CuSO4 + 2NH4OH -----> Cu(OH)2 + (NH4)2SO4
Explanation:
According to the theory of plate tectonics, where do activities such as earthquakes and volcanic eruptions occur?
A
along plate boundaries
B
in the centers of plates
C
above the surfaces of plates
D
in the outer regions of plates
Answer:
A or C.... Any one. If i am wrong let me know!
Need help on 17,19,20 please.
Answer:
c, maybe d, and I think b.
Explanation:
Im sorry if wrong
How many particles are in 47.7 g of Magnesium? (Round the average
atomic mass to two numbers after the decimal)
Answer:
1.18 × 10²⁴ particles Mg
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
47.7 g Mg
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Mg - 24.31 g/mol
Step 3: Convert
[tex]47.7 \ g \ Mg(\frac{1 \ mol \ Mg}{24.31 \ g \ Mg} )(\frac{6.022 \cdot 10^{23} \ particles \ Mg}{1 \ mol \ Mg} )[/tex] = 1.18161 × 10²⁴ particles Mg
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
1.18161 × 10²⁴ particles Mg ≈ 1.18 × 10²⁴ particles Mg
How many moles of HCL are in 18 grams? (Use the molar mass to convert miles to grams. Round you answer to 2 decimal places.)
Answer:
0.49 mol HCl
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
18 g HCl
Step 2: Identify Conversions
Molar Mass of H - 1.01 g/mol
Molar Mass of Cl - 35.45 g/mol
Molar mass of HCl - 1.01 + 35.45 = 36.46 g/mol
Step 3: Convert
[tex]18 \ g \ HCl(\frac{1 \ mol \ HCl}{36.46 \ g \ HCl} )[/tex] = 0.493692 mol HCl
Step 4: Check
Round our answer to 2 decimal places.
0.493692 mol HCl ≈ 0.49 mol HCl
Answer:
0.49 mol
Explanation:
mol=given mass /molecular mass : = 18/36.5 =0.49What types of geological events can the following interactions produce?
Divergent boundaries:
Convergent boundaries:
Transform boundaries
Answer:
divergent boundaries- volcanic activity, shallow earthquakes, new sea floor.
convergent boundaries- earthquakes, volcanoes, formation of mountains.
transform boundaries- earthquakes, crustal deformation
Explanation:
(hope this helped!!)
An object on top of a building has a GPE of 23,048j and a mass of 39kg, What is the height of the object
Answer:
59.1 mExplanation:
The height of the object can be found by using the formula
[tex]h = \frac{p}{mg } \\ [/tex]
where
p is the potential energy
m is the mass
h is the height
g is the acceleration due to gravity which is 10 m/s²
From the question we have
[tex]h = \frac{23048}{39 \times 10} = \frac{23048}{390} \\ = 59.0974...[/tex]
We have the final answer as
59.1 mHope this helps you
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
PLEASE HELP A HOMIIE
Answer:
Its the first one. The cells are arranged for structure.
Explanation:
Animal cells do not need to maintain a shape since out bodies do it for us. Plant cells need something for structure.
which elements are solid at room temperature
Answer:bromine , neon , helium , argon , lithium , beryllium
Explanation:
Elements can be divided into three state that are solid, liquid and gas depending the intermolecular forces of attraction, distance between the particles etc. Lithium, beryllium, boron, carbon, sodium, magnesium, iron, copper, etc. are solid at room temperature.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Elements can be solid liquid or gas at room temperature.
Therefore, Lithium, beryllium, boron, carbon, sodium, magnesium, iron, copper, etc. are solid at room temperature.
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what are the answers easily!!!!
Answer:
True
True
Temperature
Explanation:
Commercially, liquid vegetable oils are converted to solid fats such as margarine by : Group of answer choices
Answer:
hydrogenation
Explanation:
Liquid vegetable oils are converted to solid fats such as margarine by a process known as hydrogenation.
Commercial production of margarine requires the hydrogenation of liquid oil at a relatively high temperature and pressure and in the presence of a catalyst. During the process, a solid catalyst (usually, nickel) is added to a preheated liquid vegetable oil before the dispersion of the hydrogen gas. The polyunsaturated vegetable oil, thus, becomes saturated or partially saturated in the process. The quality of the final product depends on the degree of hydrogenation or saturation.
The process of hydrogenation turns liquid vegetable oils into solid fats like margarine. therefore, the correct option is option B.
Unsaturated molecules undergo a chemical reaction called hydrogenation in which hydrogen gas is added. Unsaturated fats and oils are frequently transformed into saturated forms, which makes them more stable and solid at room temperature. Margarine, shortenings, and other solid fats are frequently made using this method. In order to increase stability, decrease reactivity, or change the physical and chemical properties of organic compounds, hydrogenation can also be employed to diminish or eliminate double or triple bonds in such molecules.
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Your question is incomplete but most probably your full question was,
Which of the following are products of the reaction listed? Zn + 2HCI
ZnCl2 + H2
H2
НСІ
ZnCl2
Zn
Answer:
ZnCl2
H2
Explanation:
The products of the given reaction is:
ZnCl₂ and H₂
The two species are the products of the chemical combination
This reaction is a single displacement reactionBecause Zn is more reactive, it displaces hydrogen from the acidThis forms a hydrogen gasWe know this because Zn is higher in the activity series.HELPPPP give me an example of thermal energy and describe what is happening at particle level.
Answer:
Thermal energy (also called heat energy) is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other. The energy that comes from the temperature of the heated substance is called thermal energy.
Explanation:
will this help you
What organic product would you expect from the reaction of ethylmagnesium bromide (CH3CH2MgBr) with H2O.
Answer:
It would produce ethane (CH₃CH₃)
Explanation:
Ethylmagnesium bromide (CH₃CH₂MgBr) is a Grignard's reagent.
It is a highly reactive substance, and as any alkylmagnesium bromide
(R-CH₂MgBr) it reacts with water to produce an alkane (R-CH₃). R stands for any carbon structure bonded to that functional group.
When discussing distances between the solar system, which term do we use
A. Actual distance
B. Relative Brightness
D. Realtive distance
If its right you get brainless
I'm in 5th grade
3) What will be the molecular mass of gas,11.2l of which at NTP weight 14 gm?
Answer:
30 g/mol
Explanation:
Step 1: Given data
Volume of the gas at NTP: 11.2 LMass of the gas: 14 gStep 2: Calculate the moles corresponding to 11.2 L of gas
At normal temperature and pressure (1 atm, 293.15 K), 1 mol of a gas has a volume of 24.05 L.
11.2 L × 1 mol/24.05 L = 0.466 mol
Step 3: Calculate the molecular mass of the gas
0.466 moles of the gas weigh 14 g. The molecular mass is:
M = 14 g/0.466 mol = 30 g/mol
What is the molecular formula of a component whose molar mass is 88.0 and whose percent composted is 9.1
The molecular formula : C₄H₈O₂
Further explanationMaybe a compound is 54.5% carbon, 9.1% hydrogen and 36.4% oxygen,so :
mol C :
[tex]\tt \dfrac{54.5}{12}=4.54[/tex]
mol H :
[tex]\tt \dfrac{9.1}{1}=9.1[/tex]
mol O :
[tex]\tt \dfrac{36.4}{16}=2.28[/tex]
Divide by 2.28(the smallest ratio) :
C H : O =
[tex]\tt \dfrac{4.54}{2.28}\div \dfrac{9.1}{2.28}\div \dfrac{2.28}{2.28}=2\div 4\div 1[/tex]
The empirical formula : C₂H₄O
(The empirical formula)n=molecular formula
(2.12+4.1+16)n=88
(44)n=88⇒n=2
Answer rrrrrrrrr....
Answer:
The answer is "Option b".
Explanation:
[tex]\to \text{number of moles} = \frac{\text{number of atoms}}{\text{avogadro number}}[/tex]
[tex]= \frac{7.0 \times 10^{19}}{6.0221 \times 10^{23}}\\\\= 1.16 \times 10^{-4} \ moles\\\\ =1.2 \times 10^{-4} \ moles[/tex]
[tex]\to \text{sample mass}= \text{number of moles} \times \text{molar mass}[/tex]
[tex]=1.16 \times 10^{-4}\times 58.9\\\\=0.00685 \\\\ = 6.85\ g[/tex]
Which of the following are kept as a constant in Boyle's law (check all that
apply)
volume
temperature
amount
pressure
none of these
Answer:
temperature
amount
Explanation:
Under the postulate of Boyle's law, both temperature and amount(number of moles) are kept constant.
According to Boyle's law "the volume of a fixed mass of gas varies inversely as the pressure changes if the temperature is constant"
Based on the premise of this law, both temperature and amount of substance is kept constant.
can someone explain this better and simpiler?
Response:
Sorry but I think you forgot to attach or include something, thanks for the points tho!
Other:
Brainliest? Thanks!
What is the standard cell potential for a voltaic cell using the Pb2 /Pb and Mg2 /Mg half-reactions and which metal is the cathode
Answer:The standard cell potential, E˚cell =2.234 V, Pb metal is the cathode.
Explanation:
The Half cell reactions are
Pb2+(aq) + 2e– > Pb(s) ------E˚ = –0.136 V
Mg2+(aq) + 2e–>Mg(s)------- E˚ = –2.37 V
In a voltaic cell, reduction occurs at the cathode and oxidation occurs at the anode
Mg(s)---->Mg2+(aq) + 2e– ( anodic oxidation)
Pb2+(aq) + 2e----> Pb(s) ( Cathodic reduction)
We can see that Mg has a more negative reduction potential value leading to having a low reduction potential and therefore will occur at the anode since it will be oxidized. On the other hand Pb2+ has a less negative reduction potential and therefore will have a high reduction making it to occur at the cathode and be reduced
Using The standard cell potential, E˚cell = E˚cathode – E˚anode
E˚cell = –0.136 - (–2.37)
E˚cell=2.234 V
Please help me I need these answers
Answer:
Q8) True
Q9) First ionization energy
Q10) A metal oxide
Explanation:
One of the properties of group one elements (alkali metals) is that they combine with water to form basic solutions. E.g 2Na(s)+2H2O(l)→2NaOH(aq)+H2(g).
An inverse relationship exists between the distance of the outermost electron in the atom from the nucleus and the first ionization energy. As the distance between the outermost electron and the nucleus in group 17 elements increases, their first ionization energies decreases accordingly.
Group 1 elements react with oxygen to yield the corresponding metal oxides. E.g 4 Na + O2 --> 2 Na2O
Ionic compounds can conduct electricity when dissolved in water due to the presence of free floating ions.
True or False
Answer:
True
Explanation:
Using the activity series, the reaction 2Al+6HBr-2 AlBr3+3 H2 will only occur if.....Al is above Be on the periodic table or heat is added to the reaction or a precipitate forms or Al is above H on the activity series
Answer:
Al is above H on the activity series
Explanation:
The given chemical reaction is expressed as:
2Al + 6HBr → 2AlBr₃ + 3H₂
The reaction above is a single displacement or replacement reaction and will only occur if Al is above H on the activity series.
The driving mechanism of such reaction is the position of the species on the activity series. The higher an atom is the more reactive and easier it will displace the lower ones.Calculate the molar mass of a 2.89 g gas at 346 ml, a temperature of 28.3 degrees Celsius, and a pressure of 760 mmHg.
The molar mass of gas = 206.36 g/mol
Further explanationIn general, the gas equation can be written
[tex]\large{\boxed{\bold{PV=nRT}}}[/tex]
where
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.082 l.atm / mol K
T = temperature, Kelvin
mass (m)= 2.89 g
volume(V) = 346 ml = 0.346 L
T = 28.3 C + 273 = 301.3 K
P = 760 mmHg=1 atm
The molar mass (M) :
[tex]\tt PV=\dfrac{m}{M}RT\\\\M=\dfrac{mRT}{PV}\\\\M=\dfrac{2.89\times 0.082\times 301.3}{1\times 0.346}\\\\M=206.36~g/mol[/tex]
the burning of fossil fuels produces what kind of energy
Answer:
When fossil fuels are burned carbon and hydrogen react with oxygen in air to carbon dioxide (CO2) and water (H2O). During this reaction heat is released which further amplifies the reaction. Electricity is generated by transforming mechanical energy (heat) to electrical energy in a turbine or generator.
Explanation:
How many molecules are in 6.00 mol He?
HELP!!!!!
1. Define the units for molarity. Page |152 Exp. 14 pH and Solutions Pre Lab Questions (1 of 1) 2. A solution contains 5.25 grams of sodium chloride in 750.0 mL of solution. Determine the molarity of the solution. Na
Answer:
1. mol/L
2. 0.120 M
Explanation:
1. Molarity is equal to the moles of solute divided by the liters of solution. The units of molarity are mol/L.
2.
Step 1: Given data
Mass of sodium chloride (solute): 5.25 gVolume of solution (V): 750.0 mL = 0.7500 LStep 2: Calculate the moles of solute (n)
The molar mass of NaCl is 58.44 g/mol.
n = 5.25 g × 1 mol/58.44 g = 0.0898 mol
Step 3: Determine the molarity of the solution
We will use the definition of molarity
M = n/V
M = 0.0898 mol / 0.7500 L = 0.120 M