The half-life is the time used by the concentration to get half of its initial value. The cotton cloth is 5097 years old.
What is radioactive decay?Radioactive decay is the reduction of the initial concentration to the half value. The exponential decay can be given as:
[tex]\rm N(t) = N_{0}e ^{-\lamda t}[/tex]
The decay constant is calculated as:
[tex]\begin{aligned} \lamda &= \rm \dfrac {ln (2)}{t\frac{1}{2}}\\\\&= \dfrac{\rm ln(2)} {5730}\\\\&= 0.0001209\end{aligned}[/tex]
Solving further:
[tex]\begin{aligned}0.22 &= \rm e^{-0.0001209 \times t}\\\\\rm ln 0.22 &= -0.0001209 \times t\\\\\rm t &= \rm \dfrac{log 0.22}{-0.0001209}\\\\&= 5097 \;\rm years\end{aligned}[/tex]
Therefore, the cotton cloth is 5097 years.
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Which you would expect to diffuse faster, A or B?
A a gas through another gas
B a liquid through another liquid
b) explain you answer
help pls!
Answer:
A
Explanation:
I would expect a gas to diffuse through another gas faster because gases generally diffuse much faster than liquids. Hence, A is the best option.
Need help with this chem question
Answer:
b its will shift left
c yes
HELPPPPPP 30 POINTS Scientists are currently debating if a new epoch based on modern human activity should be added to the geologic timeline. What is the name of this epoch?
Question 27 options:
Anthropocene
Homo sapien
Holocene
Anthropology
Answer:
Anthropocene
Explanation:
Anthropocene epoch is sort of unofficial epoch that scientists have used to describe basically human made impact on geological scale.
here's more info:
https://www.earthsystems.com/the-anthropocene/
PLEASE HELP ASAPP!!!!! PLEASE I’LL TRY TO GIVE BRAINLIEST!
What is a benefit of fossil fuel consumption?
low pollution
increased greenhouse gases
renewable resource
cheap energy
Answer:
Cheap energy
Explanation:
Fossil fuels such as coal, oil, and gas are widely available and are much cheaper than other forms of energy (wind, nuclear, etc.) Fossil fuel products are also quite efficient, as the efficieny of fossil fuels is about 50% (which is actually really good), while solar panels for example are only about 15% efficient.
Identify all of the ions that are
formed when H3PO4 ionizes in water
Answer:
H3PO4 + H2O (Phosphoric acid + Water)
Explanation:hope its help
dictwbdjdiucgahsuxijsjaashduhsh
Answer:
stroke
Explanation:
it is said that what in the universe is made of either matter or energy
Answer:
normal matter, dark matter , dark energy
What is the change in vapor pressure when 74.10 g fructose, C6H12O6, are added to 181.5 g water (H2O) at 298 K (vapor pressure of pure water at 298 K = 3.1690 kPa, molar mass of fructose = 180.156 g/mol, molar mass of water = 18.02 g/mol)?
The change in vapor pressure when 74.10 g fructose, C6H12O6, are added to 181.5 g water is 0.146.
What is vapor pressure?Vapor pressure is the measure or tendency of a substance to change into a vapor or gaseous state.
[tex]\rm Mole\; fraction\; of\; water = \dfrac{nH_2O}{nH_2O+npent.}[/tex]
Calculate the moles of water and fructose
[tex]\rm Number\;of \;moles= \dfrac{181.5 g}{18.02}= 10.072\\\\\rm Number\;of \;moles= \dfrac{74.10 g }{180.156 g/mol}=0.4113[/tex]
The total number of moles are
[tex]\dfrac{10.072}{10.072 + 0.486} = \dfrac{10.072}{10.558} = 0.953[/tex]
Calculating the vapor pressure
0.953 x 3.1690 kPa = 3.023
Change in vapor pressure
3.1690 kPa - 3.023 = 0.146
Thus, the change in vapor pressure is 0.146.
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This is an impossible formula. Pretend it is real.
If you had 1 mol of Mn6(ClO4)3 how many moles of O would there be? Make sure your answer includes TWO decimal places.
Moles are the ratio of grams to the grams per mole. There are 12 moles of oxygen after dissociation.
What is dissociation?Dissociation is the release of the ions, cations, and anions of the molecular compound in the water. The dissociation of the compound is shown as:
Mn₆(ClO₄)₃ ⇆ 6 Mn³⁺ + 3ClO⁴⁻
From the dissociation, it can be said that 1 mole of magnesium chlorate dissociates into 12 moles of oxygen atoms.
Given, that the moles of the compound is 1 mole.
Then moles of oxygen atom will be: 1 × 12 = 12 moles
Therefore, 12 moles of oxygen atoms are produced from the dissociation of the compound.
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How much heat is released when 60.0 G of steam at 235°C is converted to water at 100°C?
Answer:12668 J.
Explanation:
First of all, steam is there so in order to convert it into water it must have to release latent heat of vaporization which is equal to approximately 2450 kJ/kg or 2450 J/g.
So, the calculation is given below.
Heat released during conversion of steam at 100°C to water at 100°C= m*L
= 5*2450= 12250 J.
Heat released during conversion of water at 100°C to water at 80°C= m*Cp*(∆T)
= 5*4.18*20= 418 J.
So total heat released= 12668 J.
hope this helps:)!!!
The heat energy released or absorbed by a system can be calculated using calorimetric equation. The heat is released when 60.0 g of steam at 235°C is converted to water at 100°C is 33858 J or 338 KJ.
What is calorimetry?Calorimetry is an analytical tool used to determine the heat energy q absorbed or released in a reaction system. The calorimetric equation connecting mass of the reactant m, specific heat capacity c and temperature difference ΔT is related by the expression:
q = mcΔT.
The mass of steam is given 60 g and temperature difference is from 235 to 100 °C thus 135 °C and the specific heat capacity of water or steam is 4.18 J/°C. The heat energy released is calculated as follows:
q = 60 g × 4.18 J/°C × 135 °C
= 33858 J
Hence, heat is released when 60.0 g of steam at 235°C is converted to water at 100°C is 33585 J.
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Which of the following results when hydrogen and chlorine chemically bond to form hydrogen chloride?
A.
a solution
B.
a mixture
C.
a precipitate
D.
a compound
Answer:
Hydrogen chloride is a mixture of hydrogen and chlorine elements. The chemical abbreviation of hydrochloric acid is HCl.
Explanation:
Is the following reaction always, sometimes or never spontaneous: NaOH(s) → Na+(aq) + OH-(aq)
See
NaOH was in solid state
Both the solute and solvent turns to aqueous i.e liquid form .
So
Randomness increasesGibbs free energy decreases ∆G is -veSo
spontaneous always05.03: SOUND Energy 9PTS!(9 points)
If objects have a lot of room to vibrate they tend to produce low pitches. If objects can only vibrate a little, they tend to vibrate faster and produce higher pitches. This investigation different an ounce of water effect a glass ability to vibrate observing the pitches it produces.
Question
How does the amount of water in a glass effect the pitch of sound
Hypothesis
complete the hypothesis statement by filling in blank.
If the amount of water in a glass is ________. then the sound pitch will be _______
Variables
What is the test Variable?
__________________________________________________________________
What is the outcome variable?
__________________________________________________________________
What are the constants in this investigation?
__________________________________________________________________
What would you do to ensure that you have a control for this experiment
________________________________________________________________________________________________________________________________________
The pitch of sound increases with decrease in the air volume.
What is the effect of the space on the pitch of sound?The pitch of sound increases with as decrease in the space available for the vibrating particles to vibrate decreases.
In the experiment with water in a glass and the pitch of sound:
If the amount of water in a glass is increases then the sound pitch will be increased.The test variable is the volume of water in th glass cupThe outcome variable is the pitch of soundThe constants are the glass cup and the sound sourceThe control in the experiment can be designed by ensuring that no external sound source is present.Therefore, it was observed that the pitch of sound increases with decrease in the air volume.
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Which part of the heart takes blood from the veins and pumps it into a ventricle?
arteries
ventricles
valves
atria
Answer:
Atria
Explanation:
The part of the heart takes blood from the veins and pumps it into ventricle is called atria
how many moles of o2 are needed to produce 34.7g of fe203
Answer:
5.09 moles of Fe is required to react with 3.82 moles of O₂.
0.326 moles of O₂ are needed to produce 34.7 grams of Fe₂O₃.
Reaction stoichiometry
In first place, the balanced reaction is:
4 Fe + 3 O₂ → 2 Fe₂O₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Fe: 4 moles
O₂: 3 moles
Fe₂O₃: 2 moles
The molar mass of the compounds is:
Fe: 55.85 g/mole
O₂: 32 g/mole
Fe₂O₃: 159.7 g/mole
Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Fe: 4 moles ×55.85 g/mole= 223.4 grams
O₂: 3 moles ×32 g/mole= 96 grams
Fe₂O₃: 2 moles ×159.7 g/mole= 319.3 grams
Moles of Fe needed
The following rule of three can be applied: If by stoichiometry of the reaction 3 moles of O₂ react with 4 moles of Fe, 3.82 moles of O₂ react with how many moles of Fe?
moles of Fe= 5.09 moles
Finally, 5.09 moles of Fe is required to react with 3.82 moles of O₂.
Moles of O₂ needed
The following rules of three can be applied: If by reaction stoichiometry 319.3 grams of Fe₂O₃ are formed from 3 moles of O₂, 34.7 grams of Fe₂O₃ are formed from how many moles of O₂?
moles of O₂= 0.326 moles
Finally, 0.326 moles of O₂ are needed to produce 34.7 grams of Fe₂O₃.
Explanation:
If a 1.75 liter solution contains 0.877 moles of CuCO3, what is the molarity?
Answer:
0.50 Molar or 0.50 Mol/L
Explanation:
Molarity = [tex]\frac{Moles of Solute}{Litres of solution}[/tex]
Molarity = n / V
Given: Volume of solution(V): 1.75 Litres
Moles of solute(n): 0.877
Substituting values,
Solution:
Molarity = [tex]\frac{0.877}{1.75}[/tex]
Molarity = 0.50 Molar (rounded off to the nearest decimal place)
∴ Molarity = 0.50 Molar/ 0.50 Mol/L
how does fire relate to science
Answer: A fire itself is the result of a chemical reaction known as combustion, where fuel and oxygen react with one another and atoms rearrange themselves irreversibly. For this to occur, fuel must reach its ignition temperature, and combustion will continue if there is enough fuel, heat and oxygen
Sample Response: According to the passage, a singularity is a single point of densely packed matter that sits at the center of a black hole. In other words, there's a lot of matter packed really tightly together, making it really heavy. This heavy bunch of matter is squished into the tiny space at the middle of a black hole.
Which details did you include in your explanation? You can check more than one answer.
I included text evidence that helped me to figure out what a singularity is.
I simplified the complex language using my own words.
I made a comparison or gave an example to help me explain.
I used synonyms and antonyms to help me explain.
The details included in the passage are I simplified the complex language using my own words. The correct option is B.
What is a passage?A passage is a group of paragraphs which talks about a topic. We have to read the passage and then answer the question.
The given passage talks about black hole, it is a center of powerful gravitational force
Thus, the correct option is B. I simplified the complex language using my own words.
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Question 7
The periodic table shows that a carbon atom has 6 protons. This means that a carbon atom also has
A
6 nutrons
B
6 electrons
С
More protons than electrons
D
An atomic mass that equals 6
Answer:
Carbon has an atomic number of 6. That means a carbon atom has 6 protons, 6 neutrons, and 6 electrons.
Which of the following is the most likely impact of clearing natural landscape to construct high-rise buildings?
Decrease in pollution
Scarcity of drinking water
Increase in animal population
Abundance of non-native plants
Answer:
the abundance of non-native plants. this MAY be right.
Explanation:
i thought it would be an increase in pollution.
During which of the following 50-year intervals has the world's population increased the most? O A. 1850-1900 O B. 1800-1850 O C. 1900-1950 O D. 1950-2000
Answer:1950-200
Explanation:
During 1950-2000 of the following 50-year intervals has the world's population increased the most. Hence, option D is correct.
What is population?The whole number of people or inhabitants in a country or region.
The world's population increased from 2.5 billion in 1950 to around 7.3 billion in 2015 and is expected to continue to rise until 2050/2100 under most UN.
During 1950-2000 of the following 50-year intervals has the world's population increased the most. Hence, option D is correct.
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What mass of H₂ is required to produce 2 moles of NH3?
Answer: RATIOS IN TERMS OF MOLES
Solution: Solution According to the balanced equation, 2 moles of NH3 are produced when 3 moles of H2 react.
Calculate the volume of 450g of gold (density=19.3 g/cm^3)
use dimensional analysis and set up your equation like so:
[tex]450g\ x\ \frac{cm^3}{19.3g}[/tex]
if you do the calculations, the 'g' should cancel out which leaves you with the unit 'cm³'
[tex]cm^3=\frac{450g}{19.3g}[/tex]
[tex]cm^3=23.31606218...[/tex]
= 23.3 cm³
[tex]\text{Density,}~ \\\\~~~~~~~\rho = \dfrac{m}{V}\\\\\implies V = \dfrac{m}{\rho}\\\\~~~~~~~~~~=\dfrac{450 ~g}{19.3 ~ g~cm^{-3}}\\\\~~~~~~~~~~=23.3~ cm^3\\\\\text{Hence, the volume of 450g gold is }~23.3 ~cm^3.[/tex]
28.25 What two aldoses yield D-xylose on Wohl degradation?
56.5
Explanation:
the degradation would be 28.25 times 2
Calculate the solubility product for the following:
Ce(IO3)4, 1.5 × 10–2 g/100.0 mL (IO3- is the anion)
Ksp = ______ x10______
Use correct significant figures
Answer: 2.749 x 10^-14
Explanation:
Given:
The concentration of Ce(IO3)4 in the solution = 1.5 x 10-2 g/100 mL= 0.15 g/1000 mL= 0.15 g/L
Molar mass of Ce(IO3)4 = 839.7267 g/mol
Therefore, the molarity of Ce(IO3)4 in the solution is given by:
[tex]$$\begin{gathered}M=\frac{0.15 \mathrm{~g} / L}{839.7267 \mathrm{~g} / \mathrm{mol}} \\M=1.7863 \times 10^{-\mathbf{4}} \mathrm{mol} / {L}=\mathbf{1 . 7 8 6 3 \times 1 0 ^ { - \mathbf { 4 } } \boldsymbol { M }}\end{gathered}$$[/tex]
The solubility equilibrium is given by:
[tex]$$\mathrm{Ce}\left(\mathrm{IO}_{3}\right)_{4(s)} \rightleftharpoons \mathrm{Ce}_{(a q)}^{3+}+3 \mathrm{IO}_{3}^{-}(a q)$$[/tex]
Therefore, the solubility product is given by:
[tex]\begin{gathered}K_{s p}=\left[C e^{3+}\right] \cdot\left[I O_{3}^{-}\right]^{3} \\\therefore K_{s p}=\left(1.7863 \times 10^{-4}\right) \times\left(3 \times 1.7863 \times 10^{-4}\right)^{3}\end{gathered}[/tex]
[tex]\therefore {K_{s p}=2.749 \times 10^{-14}[/tex]
What is the name of the functional group that is attached to this hydrocarbon? a carbon atom is single bonded to o h to the right, and h below, left, and above. alkyl halide alcohol carbonyl ketone
The name of the functional group that is attached to the following hydrocarbon is alcohol. Details about functional group can be found below.
What is functional group?A functional group in chemistry refers to a specific grouping of elements that is characteristic of a class of compounds, and determines their chemical properties.
According to this question, a hydrocarbon was given to possess the following formula:
CH3OH
This hydrocarbon is methanol and posseses an alcohol functional group (OH).
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What is the name of the functional group that is attached to this hydrocarbon?
H
│
H ─ C ─ OH
│
H
❌ A) alkyl halide
✔️ B) alcohol❌ C) carbonyl
❌ D) ketone
I Took Question Test And Nice Day.
Which is the correct equation for calculating pH?
a
pH = log[H+]
b
pH = -log[H+]
c
pH = 10-[H+]
d
pH = 10-[H+]
Answer:
b
Explanation:
That is the defintion of pH
Calculate the mass (in grams) of 3.85 x 1024 carbon atoms.
Answer:
3.40⋅1022 helium atoms weigh 0.226 gram.
Explanation:
Nitrogen gas was collected by water displacement. What was pressure of the N, collected if the temperature was 22 °C?
The pressure of the N₂ collected if the temperature was 22°C celcius is 98.6823 kPa.
What is atmospheric pressure?
The air around you has weight, and it presses against everything it touches. That pressure is called atmospheric pressure, or air pressure.
Atmospheric pressure = 101.325 kPa
Vapor pressure of water at 22°C = 2.6427 kPa
Pressure of N₂ = (Atmospheric pressure) - (vapour pressure of water at 22°C)
Pressure of N₂ = (101.325 kPa) - ( 2.6427 kPa)
Pressure of N₂ = 98.6823 kPa
Therefore, the pressure of the N₂ collected if the temperature was 22°C celcius is 98.6823 kPa.
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5
Select the correct answer.
In the Arrhenius equation, which variable represents the activation energy for the reaction?
A. Ea
B. R
C.T
D.k
Answer:
A. Ea, activation energy,, hope this helps.