Answer:
A = 349 g.
Explanation:
Hello there!
In this case, since the radioactive decay kinetic model is based on the first-order kinetics whose integrated rate law is:
[tex]A=Ao*exp(-kt)[/tex]
We can firstly calculate the rate constant given the half-life as shown below:
[tex]k=\frac{ln(2)}{t_{1/2}} =\frac{ln(2)}{58year}=0.012year^{-1}[/tex]
Therefore, we can next plug in the rate constant, elapsed time and initial mass of the radioactive to obtain:
[tex]A=500g*exp(-0.012year^{-1} *30year)\\\\A=349g[/tex]
Regards!
Why did the discovery of electrons mean that an atom must contain some positive charge?
WARNING!!!!!!!!!: NO LINKS OR I WILL REPORT YOU!!!!!
Answer
electrons are very small, so every atom would have to contain a whole lot of electrons.Atoms must also contain some type of positively charged material which balances the negative charge on the electrons.
Explanation:
J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus.
hope this helped
why would a farmer add calcium hydroxide to his soil
Como se explica o fato de o diamante e o grafite serem formados pelo mesmo elemento, o carbono, e serem materiais completamente diferentes?
Answer:
Ver explicacion
Explanation:
La capacidad de un elemento de existir en diferentes formas en el mismo estado físico se conoce como alotropía.
No es solo el carbono el que exhibe alotropía. También se sabe que el azufre y el fósforo exhiben alotropía.
Hay dos alótropos cristalinos de azufre; grafito y diamante. El grafito y el diamante difieren en la disposición de los átomos de carbono y la naturaleza de los enlaces entre los átomos de carbono en ambas sustancias.
Por lo tanto, el grafito y el diamante tienen propiedades físicas y químicas observadas completamente diferentes debido a las diferencias en la disposición de los átomos de carbono en cada sustancia, así como a las diferencias en la naturaleza de los enlaces entre los átomos de carbono en ambas sustancias.
What keeps mountains from being even taller than they
already are?
Answer:
Three main processes control mountain height: lateral support of mountains from tectonic forces, which stops mountains from collapsing under their own weight or pushes them up against gravity; climate-controlled erosion; and isostasy, which keeps mountains afloat on the hot and soft mantle material.
Explanation:
14. As the moles of salt added are increased, what
happens to the melting point of the water?
Salt increases the boiling point and decreases the melting point of water. That means if you add salt before heating some water on the stove, it will take longer to boil. Also, if you add salt to ice, it will melt faster.
What is the melting point?
Melting point is the temperature at which a given solid material changes from a solid state to a liquid, or melts.
Salt makes water boil at a higher temperature - water sticks to the salt ions, so they can't get out of the liquid as easily.
Salt makes water freeze at a lower temperature - it's probably harder for the water molecules to get organized into a solid-state with all the salt ions messing up its structure.
Hence, as the moles of salt are added melting point of the water increases.
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according to the periodic table, which two elements have an atomic mass less than twice their atomic number?
Answer:
Hydrogen and Oxygen
Explanation:
Hydrogen atomic mass = 1.008 amu
atomic mass = 15.999 amu
According to the periodic table, two elements whose atomic mass is less than twice their atomic number are hydrogen and oxygen.
The atomic number of an atom refers to the number of protons in that atom. It serves as an identity for atoms of elements. The atomic mass of element is the weighted average of the masses of all the isotopes of the element.
The atomic number of oxygen is 8 while the atomic number of hydrogen is 1. The atomic mass of oxygen is 15.999 amu while the atomic mass of hydrogen is 1.0008 amu.
We can see that twice the atomic number of oxygen gives sixteen while twice the atomic number of hydrogen gives two. Therefore, two elements whose atomic mass is less than twice their atomic number are hydrogen and oxygen.
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The reaction a(g)⇌b(g) has an equilibrium constant of 5.8 and under certain conditions has q = 336. part a what can you conclude about the sign of δg∘rxn and δgrxn for this reaction under these conditions?
Answer:
The answer is "As [tex]Q=336[/tex], at high-temperature [tex]\Delta G_{rxn}>0[/tex] and When[tex]K>1,[/tex][tex]\Delta G^{\circ}_{rxn}>0[/tex]."
Explanation:
The equation for the reaction is:
[tex]A(g) \leftrightharpoons B(g)[/tex]
[tex]K=5.8\\\\Q=336[/tex]
At equilibrium,
[tex]\Delta G^{\circ}_{rxn}>0[/tex][tex]=-RT \ln \ K[/tex]
When k=5.8(>1), the value of [tex]\ln k[/tex] would be positive
So, [tex]\Delta G^{\circ}_{rxn}[/tex] is negative (< 0)
So if K > l, [tex]\Delta G^{\circ}_{rxn}<0[/tex]
If the reaction is not in equilibrium so the equation is :
[tex]\Delta G_{rxn}>0[/tex]=[tex]\Delta G^{\circ}_{rxn}[/tex][tex]+RT \ln Q[/tex]
Substituting the expression:
[tex]\Delta G_{rxn}>0[/tex][tex]= (-RT \ln K) + RT \ln Q[/tex]
[tex]= RT(\ln Q- \ln K)\\= RT(\ln (336)-\ln (5.8))\\= RT(4.06)[/tex]
It is the positive value for all temperatures.
So, As Q = 336, at the high temperature [tex]\Delta G_{rxn}>0[/tex].
What are the 2 common uses for Copper?
Hydrocarbons separated by fractional distillation of petroleum can be cracked to make
useful shorter chain products.
Which substance is not a product of the cracking of propane, M, 44?
A C.Hg
B C2H4
C C3H6
DH2
Q Zoom image
Answer:
{ x R X
Daraaranh
a
o
זחו
Answer:
c.hg cannot be cracked for fractional distillation as there is only one of each
Explanation:
The wording of these questions are confusing how would you set this up ?
The formula is m1v1=m2v2
Answer:
8. 171074.8 mL
9. 3475 mL.
Explanation:
8. Determination of the volume of the diluted solution.
Initial Molarity (M₁) = 14 M
Initial volume (V₁) = 523 mL
Final Molarity (M₂) = 0.0428 M
Final volume (V₂) =?
Using the dilution formula, we can obtain the volume of the diluted solution as follow:
M₁V₁ = M₂V₂
14 × 523 = 0.0428 × V₂
7322 = 0.0428 × V₂
Divide both side by 0.0428
V₂ = 7322 / 0.0428
V₂ = 171074.8 mL
Therefore, the volume of the diluted solution is 171074.8 mL
9. Determination of the volume of water added.
We'll begin by calculating the final volume of the solution. This can be obtained as follow:
Initial Molarity (M₁) = 3.2 M
Initial volume (V₁) = 973 mL
Final Molarity (M₂) = 0.7 M
Final volume (V₂) =?
M₁V₁ = M₂V₂
3.2 × 973 = 0.7 × V₂
3113.6 = 0.7 × V₂
Divide both side by 0.7
V₂ = 3113.6 / 0.7
V₂ = 4448 mL
Thus, the final volume of the solution is 4448 mL
Finally, we shall determine the volume of water added. This can be obtained as follow:
Initial volume (V₁) = 973 mL
Final volume (V₂) = 4448 mL
Volume of water added =?
Volume of water added = V₂ – V₁
Volume of water added = 4448 – 973
Volume of water added = 3475 mL
States of Matter Escape Room
Matter is defined as anything that has
A. Phase changes and mass
B. Atoms and density
C. Color and weight
D. Volume and mass
Answer:
A
Explanation:
matter has mass and undergoes a phase change
What reactants form a combustion reaction?
Answer:
Hydrocarbon and oxygen
Explanation:
"a substance reacts with oxygen gas, it must involve O² as one of the reactants."
Using this, we can confirm Hydrocarbon and oxygen is a valid one.
What does Avagardo's Law state?
Answer:
Avogadro's law, a statement that under the same conditions of temperature and pressure, equal volumes of different gases contain an equal number of molecules.
Answer:
6.02 x 10^23 moles of any substance is one mole.
Explanation:
If 164.8 g of iodine monobromide is combined with 62.4 g of ammonia, determine the amount of excess reactant that remains after the reaction is completed and the percentage yield of nitrogen triiodide if 96.4 is produced?
Answer:
[tex]m_{NH_3}^{leftover}=57.88g[/tex]
[tex]Y= 92.0\%[/tex]
Explanation:
Hello there!
In this case, according to the following chemical reaction between iodine monobromide and ammonia:
[tex]3IBr+NH_3\rightarrow NI_3+3HBr[/tex]
It turns out firstly necessary to identify the limiting reactant, by considering the proper molar masses and the 3:1 and 1:1 mole ratios of iodine monobromide to nitrogen triiodide and ammonia to nitrogen triiodide respectively:
[tex]n_{NI_3}^{by\ IBr}=164.8gIBr*\frac{1molIBr}{206.81gIBr}*\frac{1molNI_3}{3molIBr} =0.266molNI_3\\\\n_{NI_3}^{by\ NH_3}=62.4gNH_3*\frac{1molNH_3}{17.03gNH_3}*\frac{1molNI_3}{1molNH_3} =3.66molNI_3[/tex]
Thus, we conclude that the limiting reactant is IBr as is yields the fewest moles of nitrogen triiodide product. Next, we can calculate the reacted grams of ammonia as the excess reactant:
[tex]m_{NH_3}^{reacted}=0.266molNI_3*\frac{1molNH_3}{1molNI_3}*\frac{17.03gNH_3}{1molNH_3}=4.52gNH_3[/tex]
And therefore the leftover of ammonia is:
[tex]m_{NH_3}^{leftover}=62.4g-4.52g=57.88g[/tex]
Next, the percent yield is calculated by firstly calculating the theoretical yield of nitrogen triiodide as follows:
[tex]m_{NI_3}^{theoretical}=0.266molNI_3*\frac{394.72gNI_3}{1molNI_3} =104.8gNI_3[/tex]
And finally the percent yield by dividing the given actual yield of 96.4 g by the previously computed theoretical yield:
[tex]Y=\frac{96.4g}{104.8g}*100\%\\\\Y= 92.0\%[/tex]
Best regards!
Balance the following reaction:
C2H6(g) + O2(g) → CO2(g) + H2O(g)
To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. Therefore, the balanced equation is
2C[tex]_2[/tex]H[tex]_6[/tex](g) + 7O[tex]_2[/tex](g) → 4CO[tex]_2[/tex](g) + 6H[tex]_2[/tex]O(g)
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.
C[tex]_2[/tex]H[tex]_6[/tex](g) + O[tex]_2[/tex](g) → CO[tex]_2[/tex](g) + H[tex]_2[/tex]O(g)
Multiply by 7 on reactant side and by 6 on product side to balance oxygen
C[tex]_2[/tex]H[tex]_6[/tex](g) + 7O[tex]_2[/tex](g) → CO[tex]_2[/tex](g) + 6H[tex]_2[/tex]O(g)
Now balance carbon and hydrogen
2C[tex]_2[/tex]H[tex]_6[/tex](g) + 7O[tex]_2[/tex](g) → 4CO[tex]_2[/tex](g) + 6H[tex]_2[/tex]O(g)
Therefore, the balanced equation is
2C[tex]_2[/tex]H[tex]_6[/tex](g) + 7O[tex]_2[/tex](g) → 4CO[tex]_2[/tex](g) + 6H[tex]_2[/tex]O(g)
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What is the function of the system shown in the diagram?
O A. removal of wastes
OB. absorption of nutrients into the bloodstream
O C. carrying oxygenated blood and nutrients to cells
O D. transmitting and receiving messages
Answer:
the answer is carrying oxygenated blood and nutrients to cells
What happens when light passes through a solution? perform an activity with a homogenous to expalin what happen when light pass through it.
Answer fast and pls read the question ;-; and will give u brainliest
Answer:
light bends and makes effects in the water
Explanation:
Look at the picture to answer
Answer:
True; Water is stored in reservoirs.
Neptune is 30 AU (astronomical units) from the sun. How long, in light minutes, would it take for light from the sun to reach Neptune?
Answer:
250 light minutes takes
Explanation:
1 astonomical unit is equal to 1.50x10¹¹m
The light travels at the speed of 3.0x10⁸m/s. That means in 1 second, travels 3.0x10⁸m. To solve this question we must find the distance of neptune to the sun in meters. In this way we can find the seconds (And minutes) that need the light to travel from the sun to neptune:
Distance from Sun to neptune:
30AU * (1.50x10¹¹m / 1AU) = 4.5x10¹²m
Time transcurred:
4.5x10¹²m * (1s / 3.0x10⁸m) = 15000s
15000s * (1min / 60s) =
250 light minutes takesIs this an example of physical or chemical weathering?
chemical
physical
Answer:
Physical
Explanation:
because the erosion of the canyon did not change any of the chemical attributes of the rock it only changed the appearance. it may have changed the color which is an example of chemical properties but in this case, it is physical. But in other cases, you would refer to this type of weathering as mechanical weathering.
Answer:
it physical
Explanation:
because it moving
CAN ANYONE HELP FIGURE OUT THESE QUESTIONS FOR ME PLEASE
Explanation:
1.180g
2.saturated solution
3.25
4.6
5.367
1: Scrieţi şi egalaţi ecuaţiile reacţiilor chimice de schimb prezentate mai jos: a) carbonat de sodiu + clorură de calciu = b) carbonat de potasiu + azotat de calciu = c) sulfat de sodiu + clorură de bariu = d) clorură de aluminiu + hidroxid de sodiu = e) sulfat de magneziu + clorură de bariu = 2: Determinaţi compoziţia procentuală a substanţei sulfat de aluminiu; calculaţi numărul de ioni Al 3+ existenţi în 3,5 Kmoli sulfat de aluminiu. 3: Acidul fluorhidric nu se poate păstra în vase de sticlă (SiO 2 ),deoarece reacţionează cu acesta: 2 SiO 2 + 4HF = SiF 4 + 2H 2 O Ştiind că sticla are un conţinut de 75,3% SiO 2, calculaţi numărul de moli, respectiv numărul de molecule de HF ce reacţionează cu 500 g sticlă. 4: Determinaţi masa de Al, respectiv de K din 500g alaun KAl(SO 4 ) 2 x 12H 2 O 5: Calculaţi cantitatea de azotat de calciu care reacţionează cu 500g soluţie carbonat de potasiu de puritate 80%. 6: Calculaţi masa de H 3 PO 4 care conţine 1,05 x 10 20 atomi oxigen.
Answer:
AMBANTOT MO MALIGO KANA
Who are the scientists that contributed in arranging of the periodic table?
in which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
Answer:
G - H2SO4
Explanation:
two hydrogen atoms and 4 oxygen atoms
The area of a circle is 38.5 cm². Calculate.
(a) the radius
The Answer is 3.501591994
Explanation:
area of circle = πr^2
radius=
39.5 = 22/7*r^2
r^2 = 7*39.5/22
= 12.56
r=3.5
do earths plates meet at boundaries
Answer:
Earth's plates meet at BOUNDARIES. Breaks in the crust called FAULTS form where plates meet. ... Most TRANSFORM BOUNDARIES where plates move apart occur along the mid-ocean ridges.
Explanation:
i hope this helped you ;)
1
According to the text, what is reduction?
one example of potential energy.
Answer:
a raised weight
water that is behind the dam
a car that is parked at the top of a hill
a you before it released
a ripe fruit before It falls
What is the molarity of 5.60 mol of sodium carbonate in 1500 ml of solution?
Answer:
3.74 M
Explanation:
We know that molarity is moles divided by liters. The first thing to do here is convert your 1500 mL of solution to L. There's 1,000 mL in 1 L, so you need to divide 1500 by 1000:
1500 ÷ 1000 = 1.50
Now you can plug your values into the equation for molarity:
5.60 mol ÷ 1.50 L = 3.74 M
Is a hydrogel a smart polymer/stimuli-responsive polmer?
Answer:
Polymer scientists have been trying to mimic this behavior by creating so called smart polymers. ... One of the most important classes of stimuli-responsive polymers used for controlled drug delivery is crosslinked polymer networks, e.g., hydrogels and microgels.
Explanation: