Answer:
Approximately 3318 disintegrations per minute.
Explanation:
The activity [tex]A[/tex] of a radioactive decay at time [tex]t[/tex] can be found with the following equation:
[tex]\displaystyle A(t) = A_0 \cdot \mathrm{e}^{-\lambda\cdot t}[/tex].
In this equation,
[tex]\mathrm{e}[/tex] is the natural base. [tex]\mathrm{e}\approx 2.71828[/tex].[tex]A_0[/tex] is the initial activity of the decay. For this question, [tex]A_0 = \rm 8540\; min^{-1}[/tex].The decay constant [tex]\lambda[/tex] of this sample needs to be found.The decay constant here can be found using the activity after 10 days. As long as both times are in the same unit (days in this case,) conversion will not be necessary.
[tex]A(10) = A_0\cdot \mathrm{e}^{\rm -\lambda \times 10\;day}= (\mathrm{8540\; min^{-1}})\cdot \mathrm{e}^{\rm -\lambda \times 10\;day}[/tex].
[tex]A(10) = \rm 6690\; min^{-1}[/tex].
[tex]\displaystyle \frac{\rm 6690\; min^{-1}}{\mathrm{8540\; min^{-1}}} = \mathrm{e}^{\rm -\lambda \times 10\;day}[/tex]
Apply the natural logarithm to both sides of this equation.
[tex]\displaystyle \ln{\left(\frac{\rm 6690\; min^{-1}}{\mathrm{8540\; min^{-1}}}\right)} = \ln{\left(\mathrm{e}^{\rm -\lambda \times 10\;day}\right)}[/tex].
[tex]\displaystyle \rm -\lambda \cdot (10\;day) = \ln{\left(\frac{\rm 6690\; min^{-1}}{\mathrm{8540\; min^{-1}}}\right)}[/tex].
[tex]\displaystyle \rm \lambda= \rm \frac{\displaystyle \ln{\left(\frac{\rm 6690\; min^{-1}}{\mathrm{8540\; min^{-1}}}\right)}}{-10 \; day} \approx 0.0200280\; day^{-1}[/tex].
Note that the unit of the decay constant [tex]\lambda[/tex] is [tex]\rm day^{-1}[/tex] (the reciprocal of days.) The exponent [tex]-\lambda \cdot t[/tex] should be dimensionless. In other words, the unit of [tex]t[/tex] should also be days. This observation confirms that there's no need for unit conversion as long as the two times are in the same unit.
Apply the equation for decay activity at time [tex]t[/tex] to find the decay activity after 47.2 days.
[tex]\displaystyle \begin{aligned}A(t)& = A_0 \cdot \mathrm{e}^{-\lambda\cdot t}\\&\approx \rm \left(8540\; min^{-1}\right)\cdot \mathrm{e}^{-0.0200280\; day^{-1}\times 47.2\;day}\\&\approx \rm 3318\; min^{-1}\end{aligned}[/tex].
By dimensional analysis, the unit of activity here should also be disintegrations per minute. The activity after 47.2 days will be approximately 3318 disintegrations per minute.
Which statement best describes the role of plants in the water and carbon cycles?
Plants release oxygen when they decompose take in oxygen for photosynthesis.
Plants take in carbon dioxide during photosynthesis and absorb water through their leaves and roots.
Plants take in oxygen during photosynthesis and absorb carbon dioxide through their leaves and roots.
Plants use oxygen to perform photosynthesis and release carbon dioxide as a by-product.
Answer: Option B
Explanation:
The plants uses sunlight to convert carbon dioxide and water into more complex carbohydrate known as glucose.
Plants utilize carbon dioxide during photosynthesis. Plants absorb water through roots and leaves.
Plants release oxygen as a by-product which is used by animals and other organism.
The carbohydrates inside the plants is broken down into simpler form and the energy released is used by plants for its cellular processes. This is known as cellular respiration.
Answer:
Plants take in carbon dioxide during photosynthesis and absorb water through their leaves and roots.
50 ml decimolar H2SO4 when mixed with 50 ml decimolar NaOH then normality of resultant solution is ?
Answer:
0.05 NExplanation:
You can calculate the normality of an acid by multiplying the molarity by the number of acid hydrogens. So, the normality for H₂SO₄ is its molarity multiplied by 2.
For bases, the normality is the product of the molarity and the number of OH⁻ ions. So, for NaOH the normality is its same molarity.
Also remember the definitions and formulae:
Molarity = number of moles of solute / volume in liters of the solutionNormality = number of equivalents of solute / volume in liters of solutionNormality = molarity × number of hydrogens or OH⁻.The chemical equation for the reaction of H₂SO₄ with NaOH is:
H₂SO₄ + 2 NaOH → Na₂SO₄ + 2 H₂OAs you see, the mole ratio is 1 mol H₂SO₄ : 2 mol NaOH meaning that every mol of H₂SO₄ neutralizes 2 moles of NaOH.
Since both reactants have the same molarity (decimolar = 0.1M) and the same volume, there are the same number of moles of each, but they have different normalities, which means different number of equivalents.
At the same molarity, the number of equivalents of H₂SO₄ is double than the number of equivalents of NaOH.
Then, after reaction half the number of equivalents of H₂SO₄ will remain in solution. The calculations are:
Before reacting:Number of moles of each compound before reacting:
H₂SO₄: 0.050 liter × 0.1 M = 0.005 mol
NaOH: 0.050 liter × 0.1 M = 0.005 mol
After reacting:Since ther reaction is 1 mol acid : 2 moles base, the base is the limiting reactant (it will be fully consumed).
Only 0.005 / 2 mol of acid will react and 0.005 / 2 mol will remain in solution. That is 0.0025 mol.
The volume of the solution will be 50 ml + 50 ml = 100 ml = 0.10 liter
So, after reaction you have:
Molarity of acid = 0.0025 mol / 0.10 liter = 0.025 M.
Normality of acid = 0.025 × 2 = 0.05 N ← answerIn 1995, 78 women were enrolled in chemistry at a certain high school while 162 men were enrolled. What was the percentage of women taking chemistry? The percentage of men?
Answer:
32.5% female
67.5% male
Explanation:
To find a percentage, you need your total.
To find your total, add the amount of men and the amount of women.
[tex]162+78=240[/tex]
240 total people were enrolled in chemistry at that high school.
Next, to solve for your percentage of female participants, divide the amount of women by your total.
[tex]\frac{78}{240} =32.5[/tex]
32.5% were women. Do the same with your male participants for your male percentage.
[tex]\frac{162}{240} =67.5[/tex]
67.5% were men.
The percentage of women taking chemistry is 32.5%, while the percentage of men taking chemistry is 67.5%.
What is Chemistry?Chemistry may be defined as a branch of science that significantly deals with the composition, properties, and structure of chemical elements and compounds. It also involves a brief study of how they can alter and the energy that is liberated or absorbed when they change.
According to the question, the number of women enrolled in chemistry = 78.
The number of men enrolled in chemistry = 162.
∴ The total number of individual = 78 + 162 = 240.
Now, the percentage of women taking chemistry is calculated by the following formula:
[tex]\frac{number of women enrolled in chemistry}{ the total number of individual}[/tex]
= 78/240 = 32.5%.
Similarly, the percentage of men taking chemistry is calculated by the following formula:
[tex]\frac{number of men enrolled in chemistry}{the total number of individuals}[/tex]
= 162/240 = 67.5%.
Therefore, it is clear that 32.5% of women were enrolled in chemistry, while 67.5% of men were enrolled themselves in chemistry.
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Consider the following equation.
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(g)
H = 98.8 kJ, and S = 141.5 J/K. Is this reaction spontaneous or nonspontaneous at high and low temperatures?
A. spontaneous at high temperatures, non-spontaneous at low temperatures
B. Non-spontaneous at high and low temperatures
C. Spontaneous at low temperatures, non-spontaneous at high temperatures
D. Spontaneous at high and low temperatures
Answer:
This reaction is A. Spontaneous at high temperatures, and non-spontaneous at low temperatures.
Explanation:
Both the enthalpy change [tex]\Delta H[/tex] and the entropy change [tex]\Delta S[/tex] due to this reaction are positive. A chemical reaction will be spontaneous only if the change in its Gibbs Free Energy [tex]\Delta G = \Delta H - T \cdot \Delta S[/tex] is negative. [tex]T[/tex] is the absolute temperature in degrees Kelvins.
Assume that both [tex]\Delta H[/tex] and [tex]\Delta S[/tex] doesn't change much as [tex]T[/tex] increases. The value of [tex]\Delta G[/tex] will initially be close to [tex]\Delta H[/tex] when [tex]T[/tex] is small. The sign of [tex]\Delta G[/tex] will depends on that of [tex]\Delta H[/tex]. However, [tex]\Delta H[/tex] is positive, so at low temperatures [tex]\Delta G[/tex] will be positive and the reaction will be non-spontaneous.
However, as [tex]T[/tex] increases, the role of entropy change becomes more significant. The sign of [tex]\Delta G[/tex] will eventually be the opposite of [tex]\Delta S[/tex]. The value of [tex]\Delta G[/tex] will eventually drop below zero after the value of [tex]T[/tex] rises above [tex]\Delta H / \Delta S[/tex]. The reaction will eventually become spontaneous.
Answer:
A.) spontaneous at high temperatures, non-spontaneous at low temperatures
Explanation:
Edge2021
Which factor is most important to consider when evaluating a journal article about global warming?
A) Is the article long enough?
B) Does the article contain facts or only opinions?
C) Did the author of the article use complex, scientific words?
D) Does the author of the article have a doctorate degree?
Answer:
Does the article contain facts or only opinions? - B)
Answer:
The correct answer will be option-B.
Explanation:
Global warming is a hot topic of debate in the science world on how to resolve the environmental issues created by global warming. The scientific journals usually contain the articles related to the new research and scientific discoveries reviewed by the peer-review fellow scientists.
The journals ensure that the research articles to be published containing the experimental data which supports the hypothesis which should not be plagiarized. The article should be based on the reviewed facts and not personal small opinions. So to evaluate articles on global warming, one must ensure that the data should not be plagiarized.
Thus, Option-B is the correct answer.
Global climatic patterns are changing because of the melting of polar ice caps. The melting of polar ice caps is an example of the interaction between the
Final answer:
The melting of polar ice caps is related to global climate change resulting from enhanced greenhouse effect due to elevated atmospheric carbon dioxide levels, which affects weather patterns and increases Earth's temperatures.
Explanation:
The melting of polar ice caps is an example of the interaction between various components of Earth's system, including the atmosphere, hydrosphere, cryosphere, lithosphere, biosphere, and anthrosphere. This process is intricately linked to the concept of global climate change, which encompasses altered global weather patterns, changes in temperature, and shifts in other climatic factors. Such changes are often attributed to rising levels of atmospheric carbon dioxide and other greenhouse gases, which trap heat and contribute to the warming of Earth's surface, known as the greenhouse effect.
As the planet's temperature increases, ice caps and glaciers, such as those in Greenland and Antarctica, melt at an accelerated rate. This melting contributes to global climate change by affecting sea levels, weather patterns, and other ecological phenomena. As such, understanding the changes in Earth's ice caps and their impact is crucial to gauging the full scope of climate change and its implications for modern civilization, including ecosystem dynamics and the potential hazards to human life and infrastructure.
Mushrooms play look like plants but you’re actually fungi what is the similarities and differences between fungi and plants
Answer:
Explanation:
Similarities
Both fungi and plants are multicellular organisms with different cells performing various life functions. They are both eukaryotic organisms with membrane bound organelles and having a distint nucleus. Fungi and plants are generally fixed and they do not move from one place to another like animals.Differences
Plants produce their own food and are called autotrophs while most fungi are heterotrophs that feeds on chemical matter from producers. Plants are producers in the ecosystem while fungi are decomposers. Plants reproduce using seeds while fungi use sporesIn plants, food produced are stored as starch whereas in fungi, food is stored as glycogen. Examples of plants are orange, mango, banana while mushrooms are fungi. Most plants are generally green in color while fungi are of different colors and are commonly white.Why do electrons affect the structure of a molecule?
Electrons affect the structure of a molecule by playing a role in chemical bonding. They are involved in the formation of chemical bonds between atoms, which determines the shape and stability of the molecule.
Explanation:The structure of a molecule is affected by electrons because electrons play a significant role in chemical bonding. Electrons are negatively charged particles that orbit the nucleus of an atom. When atoms come together to form a molecule, the electrons are involved in the formation of chemical bonds between the atoms.
For example, in covalent bonding, atoms share electrons, which can result in the formation of single, double, or triple bonds. The arrangement and distribution of electrons determine the shape and stability of the molecule.
when an iron nail is placed in an aqueous solution of copper(ii)sulphate,a reaction take place.construct an ionic equation for reaction?
The net ionic equation for this reaction is [tex]Fe(s) \ + \ Cu^{2+}(aq) \ \rightarrow \ Fe^{2+}(aq) \ + \ Cu(s)[/tex]. In ionic equations the soluble compounds are written in their dissociated ion forms. The ionic equation can be determined by knowing the general solubility rules. In this problem there are sulfate compounds involved. It is important to know that sulfates are generally soluble except for sulfates of Ba, Pb, Ag, and Sr. Therefore, the ones dealt with in this problem, CuSO4 and FeSO4, are both soluble in water.
Further Explanation:
The complete equation for this reaction is:
[tex]Fe(s) \ + \ CuSO_{4}(aq) \rightarrow \ FeSO_{4}(aq) \ + \ Cu(s)[/tex]
CuSO4 and FeSO4 are soluble in water which will lead to the ionic equation:
[tex]Fe(s) \ + \ Cu^{2+}(aq) \ + \ SO_{4}^ {2-}(aq) \ \rightarrow \ Fe^{2+}(aq) \ + \ SO_{4}^{2-}(aq) \ + \ Cu(s)[/tex]
Since the sulfate ion appears on both sides, it is a spectator ion. Spectator ions are unchanged in the chemical reaction and are removed from the net ionic equation:
[tex]\boxed {Fe(s) \ + \ Cu^{2+}(aq) \ \rightarrow \ Fe^{2+}(aq) \ + \ Cu(s)}[/tex]
Based on the net ionic equation it can be seen that this is a reduction-oxidation reaction. Iron was oxidized and copper was reduced.
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Which of the following is not true about compounds?
Compounds are combinations of elements that join in specific ratios.
A specific compound always has the same mass ratio of its components.
Elements can combine in any proportion to form a compound.
Different mass ratios of components mean different compounds.
Answer:
Elements can combine in any proportion to form a compound. -third choice
Answer:
C. Elements can combine in any proportion to form a compound.
Explanation:
If a base is added to water, what will occur?
hydronium ion concentration is increased.
hydroxide ion concentration is decreased.
[H+] is decreased.
[OH-] is decreased.
Answer:
C
Explanation:
The first and most obvious statement is that [OH-] is increased, but that is not offered to you.
The second most obvious statement is that the [H+] ion is decreased. That is offered to you. It is C
Answer:
[H+] is decreased.
Explanation:
Arrhenius Theory:
An acid is a substance which produces one or more hydrogen ions, (H+) in aqueous solution.
Examples:
[tex]HCl(aq)>H^+(aq)+Cl^-(aq)\\\\HBr(aq)>H^+(aq)+Br^- (aq)\\\\H_2 SO_4(aq)>2H^+(aq)+SO_4^2- (aq)\\\\H_3 PO_4(aq) >3H^+ (aq)+PO_4^3-(aq)\\\\CH_3 COOH(aq)>CH_3 COO^- (aq)+H^+ (aq)[/tex]
A Base is a substance which produces one or more hydroxyl ion or hydroxide ion (OH-) in aqueous solution.
Examples
[tex]NaOH(s)>Na^+ (aq) + OH^- (aq)\\\\KOH(s)>K^+ (aq) +OH^- (aq)\\\\Ca(OH)_2 (s)>Ca^{2+} (aq)+2OH^-(aq)\\\\Al(OH)_3 (s)> Al^{3+}(aq)+ 3OH^- (aq)[/tex]
Please note:
(aq) stands for aqueous which means in the presence of water that is, water acts as a solvent
So, on adding a base to the water increase in [tex][OH^-][/tex] will take place and this will decrease the Hydrogen ion concentration
Pure water contains [tex][H^+]=[OH^-][/tex]
if the solution is acidic [tex][H^+ ]>[OH^- ][/tex]
if the solution is Basic [tex][H^+ ]<[OH^- ][/tex]
How many molecules of Ca are found in a sample with 0.2 mols?
Answer:
[tex]\boxed{1.2 \times 10^{23}\text{ atoms}}[/tex]
Explanation:
6.023 × 10²³ atoms of Ca are in 1 mol of Ca
[tex]\text{No. of atoms} = \text{0.2 mol} \times \dfrac{6.023 \times 10^{23}\text{atoms }}{\text{1 mol }} = \mathbf{1.2 \times 10^{23}} \textbf{ atoms}}\\\\\text{There are }\boxed{\mathbf{1.2 \times 10^{23}} \textbf{ atoms}} \text{ atoms in 0.20 mol of Ca}[/tex]
How are weathering and erosion the same?
Answer:
Erosion involves movement to a new location, Weathering occurs in place, although they can occur together and both are caused by similar factors of wind, water, ice, temperature, and even biological action.
The vapor pressure of benzene is 100.0 mmHg at 26.1°C. Calculate the vapor pressure of a solution containing 26.6 g of camphor (C10H16O) dissolved in 94.0 g of benzene. (Camphor is a low-volatility solid.)
Hey there!:
Molar mass benzene = 78.11 g/mol
find number of moles of benzene :
Moles of benzene = mass / molar mass of benzene
Moles of benzene = 94.0 / 78.11
Moles of benzene = 1.203 moles
Molar mass camphor = 152.23 g/mol
Moles of camphor = 26.6 / 152.23
Moles of camphor = 0.1747 moles
Therefore , vapor pressure of solution is :
mole fraction of benzene * vapor pressure of solution
= 1.203 / ( 1.203 + 0.1747 ) * 100.0
= ( 1.230 / 1.3777 ) * 100.0
= 0.8927 * 100.0
=> 89.27 mmHg
Hope this helps !
Which of the following elements is not contained in a carbohydrate?
Carbon
Hydrogen
Nitrogen
Oxygen
Option A. Nitrogen is not in a carbohydrate
carbo-(carbon)
Hydrate-water
Which of the following elements is not contained in a carbohydrate?Nitrogen is not contained carbohydrate, Nitrogen is in the soil under our feet, in the water we drink, and in the air we breathe. In fact, nitrogen is the most abundant element in Earth's atmosphere: approximately 78% of the atmosphere is nitrogen! Nitrogen is important to all living things, including us.
In addition to what we might think of as the classical elements: earth, water, fire, air, and gas (space), in many ancient eastern concepts of self there are an additional two: consciousness (or thought itself) and the element of spirit. Each of us is comprised of all seven elements
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For the reaction 2Fe+3Cl2=2FeCl3
The question is incomplete but the full question may be found in other sources.
This is the complete question:
For the reaction 2Fe + 3Cl₂ → 2FeCl₃ which option is more accurate?a. FeCl₃, reducing agent; Fe, oxidizing agent.
b. Cl₂, oxidising agent; Fe reducing agent.
c. Fe, reducing agent; FeCl₃, oxidizing agent.
d. FeCl₃, oxidizing agent, Cl₂, reducing agent.
Answer:
Option b. Cl₂, oxidising agent; Fe reducing agent.Explanation:
It is easy to recognize by simple inspection that the given reaction is a redox one (oxidation - reduction) because the substances in the reactant side are pure elements (whose oxidation state is always zero) and the substance in the product side is a compound formed by the two reactant elements (which means that now they have a different oxidation state).
In a redox reaction, the element that increases its oxidation number loses electrons and reduces other element, so this is the reducing agent. On the other hand, the element whose oxidation number is decreased has gained electrons, a so it is the oxidizing agent (it oxidizes other element).
I will show the oxidation states of each species in the chemical reaction, using superscripts:
Fe⁰ + 3Cl₂⁰ → 2 Fe⁺³Cl₃⁻¹Thus:
2 atoms of Fe increased their oxidation number from 0 to +3; meaning that they lost 6 electrons (3 electrons each), so Fe is the reducing agent (it reduced the Cl atoms).6 atoms of Cl decreased their oxidation number from 0 to -1; meaning that they gained 6 electrons in total (1 elecron each), so Cl is the oxidizing agent (it oxidized the Fe atoms).Try try try please for me please
Answer:
a.) It is a chemical reaction because a new substance was formed and a colour change occurred in the reaction.
b.) Iron- Metallic element
sulpher- Non-Metalic element
Iron Sulphide- Compound
HOPE IT HELPS....
which is the odd one brass,copper, aluminum,iton , sapphire
Sapphire.
It is a stone not a metal.
how many moles of nitrogen are there in 6.8 liters at standard temperature and pressure?
Answer:
Explanation:
Given parameters:
Volume of gas at STP = 6.8L or 6.8dm³
Condition: Standard Temperature and Pressure
Solution:
For gases at standard temperature and pressure,
number of moles = [tex]\frac{volume of occupied}{22.4}[/tex]
number of moles = [tex]\frac{6.8}{22.4}[/tex] = 0.3moles
Which of the following lists igneous rock in order from least to most ferromagnesian silicates?
Intermediate, ultramafic, mafic, felsic
Ultramafic, mafic, intermediate, felsic
Felsic, intermediate, mafic, ultramafic
Felsic, mafic, ultramafic, intermediate
Answer:
Felsic, intermediate, mafic, ultramafic
Explanation:
Ferromagnesian igneous rocks are those that contains ferromagnesian silicate minerals with magnesium and iron in their structure. Some of these minerals are olivine, pyroxene, amphibole, calcic palgioclase e.tc. Ultramafic rocks have these silicate minerals in them. They impart a dark coloration on their outlook.
Felsic minerals on the other extreme are rich in non-ferromagesian minerals such as quartz, feldspars which lacks magnesium and iron in their structures. The intermediate and the mafic igneous rocks are a mix between the two extremes. So in terms of ferromagnesian silicates component:
felsic < intermediate < mafic < ultramafic
The correct order of igneous rocks from least to most ferromagnesian silicates is: Felsic, Intermediate, Mafic, Ultramafic. The sequence represents a gradation from rocks with the lowest content of ferromagnesian minerals to the ones with the highest content.
Explanation:The correct order of igneous rocks from least to most ferromagnesian silicates is: Felsic, Intermediate, Mafic, Ultramafic. This order represents a sequence from rocks with the lowest amount of ferromagnesian silicates to the highest amount. Felsic rocks are typically light in color and contain less than 20% ferromagnesian minerals, which are rich in iron and magnesium. Intermediate rocks contain 20-45% ferromagnesian minerals. Mafic rocks are darker and contain 45-85% of these minerals. Lastly, ultramafic rocks have more than 85% ferromagnesian minerals, being the rock type with the highest content.
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An oxygen atom has a mass of 2.66*10^-23 and a glass of water has a mass of 0.050 kg. What is the mass of 1 mole of oxygen atoms? Round your answer to 3 significant digits. How many moles of oxygen atoms have a mass equal to the mass of a glass of water? Round your answer to 2 significant digits.
Answer:
16.0 g; 3.1 mol
Explanation:
(a) Mass of O atoms
Mass = 6.022 × 10^23 atoms × (2.66 × 10^-23 g/1 atom) = 16.0 g
(b) Moles of O atoms
0.050 kg = 50 g
Moles = 50 g × (1 mol/16.0 g) = 3.1 mol
Answer : The mass of 1 mole of oxygen atoms is, 16.0 grams
The moles of oxygen atoms is, 3.1 moles
Explanation :
First we have to calculate the mass of 1 mole of oxygen atoms.
Given : Mass of 1 oxygen atom = [tex]2.66\times 10^{-23}g[/tex]
As, 1 atom of oxygen has mass = [tex]2.66\times 10^{-23}g[/tex]
So, [tex]6.022\times 10^{23}[/tex] atom of oxygen has mass = [tex](6.022\times 10^{23})\times (2.66\times 10^{-23})=16.0g[/tex]
Thus, the mass of 1 mole of oxygen atoms is, 16.0 g
Now we have to calculate the moles of oxygen atoms.
As per question, the mass of oxygen atoms = mass of a glass of water = 0.050 kg = 50 g
Formula used :
[tex]\text{Moles of oxygen atoms}=\frac{\text{Mass of oxygen atoms}}{\text{Molar mass of oxygen atoms}}[/tex]
Molar mass of oxygen atom = 16 g/mole
[tex]\text{Moles of oxygen atoms}=\frac{50g}{16g/mole}=3.1mole[/tex]
Therefore, the moles of oxygen atoms is, 3.1 moles
Question 6 of 10
5 Points
Put these time divisions in order, from longest to shortest.
Epoch
11 Eon
1
Period
Answer:
çok güzel olmuş teşekkürler hocam yorumu siz yapabilirsiniz ve bana göre bu ne biçim ve doğru olarak verilmiştir denildi bu kadar güzel ve yeni bölümleri ile birlikte eğlenelim bu arada yay ve doğru bir karar aldık ve doğru şekilde
Answer:
eon ,era ,period ,epoch.
How many mols are present in the a sample of silver nitrate which has
5.3x10^24 molecules.
Answer: 5.3 x 10^24 formula units of silver nitrate is equivalent to 8.8 moles of silver nitrate. Silver nitrate is an ionic compound, therefore, its representative particle is called a "formula unit" instead of molecule. For every mole of a substance, we know that there are 6.022 x 10^23 representative units of that substance. The amount of particles in one mole of substance is called Avogadro's number.
Further Explanation:
We can convert from number of representative particles to moles using the formula:
[tex]\boxed {no. \ of \ moles \ = \ ( given \ no. \ of \ particles) \ (\frac{1 \ mole}{\ 6.022 \ x 10^{23} particles})}[/tex]
For this problem, we can calculate the number of moles by plugging in the given values to the equation above,
[tex]no. \ of \ moles \ = (5.3 \ x \ 10^{24} \ formula \ units \ AgNO_{3}) \ (\frac{1 \ mole \ AgNO_{3}}{6.022 \ x 10^{23} \ formula \ units AgNO_{3}}) \\\\\boxed {no. \ of moles \ AgNO_{3} \ = \ 8.8 \ moles}[/tex]
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Final answer:
To find the number of moles of silver nitrate in a sample with 5.3x10^24 molecules, divide the number of molecules by Avogadro's number. This results in approximately 8.8 moles of silver nitrate.
Explanation:
To determine how many moles are present in a sample of silver nitrate with 5.3x1024 molecules, you can use Avogadro's number, which is 6.022 x 1023 molecules per mol. By dividing the number of molecules in the sample by Avogadro's number, you will get the number of moles in the sample.
To perform the calculation:
Number of moles = (5.3x1024 molecules) / (6.022x1023 molecules/mol)Number of moles ≈ 8.8 moles of silver nitrateTherefore, the sample contains approximately 8.8 moles of silver nitrate.
A 49.3 sample of CaCO3 was treated with aqueous H2SO4, producing calcium sulfate, 3.65 g of water and CO2(g). What was the % yield of H2O?
Answer:
41.1%
Explanation:
First write the balanced reaction:
CaCO₃ + H₂SO₄ → CaSO₄ + H₂O + CO₂
Now calculate the theoretical yield:
49.3 g CaCO₃ × (1 mol CaCO₃ / 100 g CaCO₃) = 0.493 mol CaCO₃
0.493 mol CaCO₃ × (1 mol H₂O / 1 mol CaCO₃) = 0.493 mol H₂O
0.493 mol H₂O × (18 g H₂O / mol H₂O) = 8.87 g H₂O
Now calculate the % yield:
3.65 g H₂O / 8.87 g H₂O × 100% = 41.1%
Answer:
[tex]\boxed{\text{41.1 \%}}[/tex]
Explanation:
MM: 100.09 18.02
CaCO₃ + H₂SO₄ ⟶ CaSO₄ + H₂O + CO₂
m/g: 49.3 3.65
1. Theoretical yield
(a) Moles of CaCO₃
[tex]\text{Moles of CaCO${_3}$} = \text{49.3 g CaCO${_3}$} \times \dfrac{\text{1 mol CaCO${_3}$}}{\text{100.09 g CaCO${_3}$}} = \text{0.4926 mol CaCO${_3}$}[/tex]
(b) Moles of H₂O
[tex]\text{Moles of H${_2}$O} = \text{0.4926 mol CaCO${_3}$} \times \dfrac{\text{1 mol H${_2}$O}}{\text{1 mol CaCO${_3}$}} = \text{0.4926 mol H${_2}$O}[/tex]
(c) Theoretical mass of H₂O
[tex]\text{Mass of H${_2}$O} = \text{0.4926 mol H${_2}$O} \times \dfrac{\text{18.02 g H$_{2}$O}}{\text{1 mol H${_2}$O}} = \text{8.88 g H${_2}$O}[/tex]
(d) Percent yield
[tex]\text{Percent yield} = \dfrac{\text{ actual yield}}{\text{ theoretical yield}} \times 100 \% = \dfrac{\text{3.65 g}}{\text{8.88 g}} \times 100 \% = \textbf{41.1 \%}\\\\\text{The percent yield is }\boxed{\textbf{41.1 \%}}[/tex]
Which substance is a gas at 20˚C and one atmosphere of pressure? A. C B. O3 C. Ca D. I2
Answer:
O3
Explanation:
The answer to the question is O3 .
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The gas substance at 20˚C and one atmosphere of pressure is carbon dioxide.
Explanation:Out of the options given, the substance that is a gas at 20˚C and one atmosphere of pressure is A. C. C stands for carbon, which exists in its gaseous form as carbon dioxide (CO2) at this temperature and pressure. Carbon dioxide is a compound composed of one carbon atom bonded to two oxygen atoms.
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Two scientists did the same experiment but arrived at different results. The results would most likely be ?
Answer:
They did not have accurate data and information.
Answer:
Provide new testable ideas.Explanation:
Supposing that both scientific had objectivity and no bias in their research, the results most likely provide new testable ideas. This type of situation occurs when new theories are being proved for first time. Most of people thing that scientific laws were proved in one experiment, but the reality is that experiments need plenty reproductions, even after hundreds of years of research.
Heat flows from water in one container to another. What difference between the two samples of water causes heat to flow?
Answer:
Difference in temperature
Explanation:
Temperature is the degree of hotness or coldness of a body. The difference in temperature between two bodies enables heat transfer from the hotter body to the colder one. If two bodies are at the same temperature, heat transfer will not occur between them. This why in the vicinity of hot water, a cold water becomes warmer.
What is the solubility of 618 grams of zinc chloride (ZnCl2) dissolved into 150 cm3 of water?
A. 242.72g/dm3
B. 41.2g/dm3
C. 0.24g/dm3
D. 4120g/dm3
Answer:
D. 4120 g/dm3
Explanation:
Given:
Mass of Zn = 618 g
Mass of water = 150 cm3
To determine:
Solubility of the given amount of Zn in water
Calculation:
Solubility is the amount of a substance that can be dissolved in a given volume.
Unit conversion:
1 cm3 = 0.001 dm3
Therefore, 150 cm3 of water is equivalent to:
[tex]\frac{150 cm3*0.001dm3}{1cm3}=0.15dm3[/tex]
[tex]Solubility = \frac{618g}{0.15dm3}=4120g/dm3[/tex]
The solubility of 618 grams of Zinc chloride (ZnCl2) dissolved into 150 cm³ of water is 4120g/dm³.
Further Explanation;Solubility Solubility refers to the ability of a substance called the solute to dissolve on another called the solvent.Solubility is measured as the maximum amount of solute that can dissolve in a solvent at a given temperature.It is therefore defined as the maximum amount of a solute that can dissolve in a 100g of water. It is measured in either in grams per 100 g of solvent (water) or number of moles per L of solution. To calculate the solubility in g/100g.We divide the mass of the compound(solute) by the mass of the solvent and then multiply by 100 g to calculate the solubility in g/100g Solubility = Mass of solute × 100 g/mass of solvent (water).We are given;
Mass of solute = 618 g of ZnCl2Mass of water = 150 cm³Therefore;Solubility of ZnCl2 = 618 g × 100 g/150 cm³ = 412 g/100 g of waterSolubility in g/dm³ we;
= 412 g ÷ 0.1 dm³
= 4120 g/dm³
Keywords: Solubility, solubility calculation, solubility in g/100g.
Learn more about:
Solubility: https://brainly.com/question/12289941Calculation of solubility: https://brainly.com/question/494904Factors affecting solubility: https://brainly.com/question/12414410Level: High school
Subject: Chemistry
Topic: Solubility
Sub-topic: solubility of substances in water
An acid without
oxygen EXCEPT HCI
HF hydrofluoric acid
HBr hydrobromic acid
HI hydroiodic acid
H₂S hydrogen sulfide
2. How many nanometers are in 5.6 x 10-4 meters?
Answer:
[tex]\boxed{5.6 \times 10^{5}\text{ nm}}[/tex]
Explanation:
1 nm = 10⁻⁹ m
[tex]5.6 \times 10^{-4}\text{ m} \times \dfrac{\text{1 nm}}{10^{-9}\text{ m}} = \mathbf{5.6 \times 10^{5}}\textbf{ nm}\\\\\text{There are } \boxed{\mathbf{5.6 \times 10^{5}}\textbf{ nm}} \text{ in 5.6 $\times 10^{-4}$ m}[/tex]
5.4 × [tex]10^{5}[/tex] nanometers are in 5.6 x [tex]10^{-4}[/tex] meters
Calculation,
Since, 1 nanometer = [tex]10^{-9}[/tex] meter.
1 meter = [tex]10^{9}[/tex] nanometer
5.6 x [tex]10^{-4}[/tex] meters = 5.6 x [tex]10^{-4}[/tex] × [tex]10^{9}[/tex] nanometer = 5.4 × [tex]10^{5}[/tex] nanometer
What is unit of length or distance?The distance or length can be measured by many units like,
Picometer, Nanometer, micrometer, milimeter, centimeter, meter and kilometer.The largest unit is kilometer.The standard unit of length is meter.learn about nanometer,
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