Answer: Option (C) is the correct answer.
Explanation:
According to ideal gas law, product of pressure and volume equals n times R times T.
Mathematically, PV = nRT
where P = pressure
V = volume
n = number of moles
R = gas constant
T = temperature
Since it is known that value R = 0.082 L [tex]atm mol^{-1} K^{-1}[/tex] and the other values are given as P = 15.0 atm, V = 100 mL = 0.1 L, and n = 0.5 moles.
Therefore, calculate value of temperature as follows.
PV = nRT
[tex]15 atm \times 0.1 L[/tex] = [tex]0.5 moles \times 0.082 L atm mol^{-1} K^{-1} \times T[/tex]
T = 36.58 K
Thus, we can conclude that temperature is 36.5 K.
Which of the following aqueous solutions has the lowest freezing point?
The balanced equation for the generation of sugar from sunlight water and co2 is
The balanced equation for the generation of sugar from sunlight water and CO₂ is
6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂
carbon dioxide + water → sugar + oxygen
The process of photosynthesis occurs when the chlorophyll present in the leaves of plants absorb sunlight to make food in the presence of carbon dioxide (enters through the stomata of leaves) and water (absorbed from the roots). As a result of this reaction sugar and oxygen is formed. After that sugar is converted in to starch and oxygen is released into air.
Photosynthesis is the biological process that transforms sunlight, water, and CO2 into glucose and oxygen. The balanced equation for photosynthesis is 6CO₂ + 6H₂O + light energy --> C6H12O6 + 6O2. The process includes intermediate reactions that eventually form simple carbohydrate molecules.
Explanation:The process that generates sugar from sunlight, water, and CO2 is called photosynthesis. The balanced chemical equation for photosynthesis is 6CO₂ + 6H₂O + light energy --> C6H12O6 + 6O2.
During photosynthesis, plants use sunlight energy to convert carbon dioxide gas (CO2) and water (H2O) into glucose (C6H12O6) and oxygen (O2). This process is complex and involves intermediate reactions and products.
Glyceraldehyde-3-phosphates, which are simple carbohydrate molecules that can be converted to glucose and various other sugar molecules, are formed during the course of the reaction.
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A metal sphere has a mass of 39.0g and a volume of 10.0cm is the sphere made of pure aluminum
What did democritus and aristole think about the composition of matter
How many grams of solute are present in 375 ml of 0.120 m kbr?
Is laundry detergent an element compound or mixture?
Two compound samples are composed of the same elements, but in different proportions. what can you conclude about the 2 samples?
Final answer:
Two different compound samples consisting of the same elements but in different proportions are different compounds. They exemplify the Law of Multiple Proportions, with the specific mass ratios indicating the identity of the compounds.
Explanation:
If two compound samples are composed of the same elements but in different proportions, we can conclude that these are different compounds. This observation is encompassed by the Law of Multiple Proportions which states that when two elements combine to form more than one compound, they do so in ratios of small whole numbers. For instance, carbon and oxygen can form carbon monoxide (CO) with a ratio of 1:1 and carbon dioxide (CO2) with a ratio of 1:2. Therefore, the different mass ratios indicate different compounds altogether, each with unique properties.
The example given in the question shows compound A with a carbon to oxygen mass ratio of approximately 1:1.33, and compound B with a ratio of approximately 1:2.66, suggesting that compound B contains twice as many oxygen atoms per carbon atom compared to compound A. This could indicate that compound A is carbon monoxide and compound B is carbon dioxide, illustrating the Law of Multiple Proportions.
What is the half-life of a 0.5 g sample of radioisotope that decayed to 0.125 g in 9.6 min?
The half-life of a radioisotope that decayed from 0.5 g to 0.125 g in 9.6 min is 4.8 minutes, calculated by recognizing that two half-lives have occurred within the given timeframe.
The question concerns the calculation of the half-life of a radioisotope based on the amount of material that remains after a certain period of time. The half-life is the time taken for half of the radioactive nuclei in a sample to decay. To determine the half-life, we can apply the formula for exponential decay:
N(t) = N(0) * (1/2)^(t/T)
Where:
N(t) is the remaining quantity of the substance after time t,
N(0) is the initial quantity of the substance,
t is the time that has passed,
T is the half-life of the substance.
In this case, we start with 0.5 g and end with 0.125 g after 9.6 minutes. Since two half-lives have passed to get from 0.5 g to 0.125 g (0.5 g -> 0.25 g -> 0.125 g), we can calculate the half-life as:
9.6 minutes / 2 = 4.8 minutes
Therefore, the half-life of the radioisotope is 4.8 minutes.
Select all that apply. choose the two correct statements below. the elements of the halogen family are very reactive because: they readily lose one valence electron. they require only one electron to complete their outer shell. they have a high electronegativity. they form unstable gas molecules.
Answer:
require only one electron to complete their outer shell
have a high electronegativity
Explanation:
Aluminum metal reacts with iron(ii) sulfide to form aluminum sulfide and iron metal. what is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest, whole-number stoichiometric coefficients?
Answer: coefficient for aluminum is 2.
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The skeletal equation is:
[tex]Al+FeS\rightarrow Al_2S_3+Fe[/tex]
The balanced equation for single displacement reaction is:
[tex]2Al+3FeS\rightarrow Al_2S_3+3Fe[/tex]
Thus the coefficient for aluminum when the chemical equation is balanced is 2.
Which of the following does not describe a characteristic of carbon?
A.) It is non-metallic
B.) It has four valence electrons
C.) It has an electron configuration of 1s2s2p2
D.) It forms bonds only, with itself and not other atoms.
Sheila's measured glucose level one hour after a sugary drink varies according to the normal distribution with μμ = 120 mg/dl and σσ = 20 mg/dl. what is the level l such that there is probability only 0.15 that the mean glucose level of 5 test results falls above l?
Since the sample size is below 30, in this case we use the t statistic. The formula for t score is:
t = (x – u) / (σ / sqrt n)
where,
x = the level l = unknown
u = sample mean = 120 mg / dl
σ = standard deviation = 20 mg / dl
n = sample size or number of results = 5
Using the standard distribution tables for t, we can find the value of t given the probability (P = 0.15) and degrees of freedom (DOF).
t = 1.036
Going back to the formula for t score:
1.036 = (x – 120) / (20 / sqrt 5)
x = 129.27 mg / dl = l
Final answer:
To find the glucose level such that the probability of the mean of 5 tests being above it is 0.15, we calculate the reduced standard deviation for the mean of the tests, find the corresponding z-score for a cumulative probability of 0.85, and apply the formula for the mean's distribution. The level l is found to be 129.267 mg/dl.
Explanation:
The question asks for the level l such that there is only a 0.15 probability that the mean glucose level of 5 test results falls above l, given that Sheila's glucose level after a sugary drink follows a normal distribution with a mean (μ) of 120 mg/dl and a standard deviation (σ) of 20 mg/dl.
To solve for l, we first need to recognize that the distribution of the mean of several test results (in this case, 5) will also be normally distributed, with the same mean but with a reduced standard deviation that is equal to the original standard deviation divided by the square root of the number of tests (σ/√n). For 5 tests, the new standard deviation (σnew) is 20/√5 = 8.9443 mg/dl.
The next step involves determining the z-score that corresponds to a probability of 0.85 (since 1 - 0.15 = 0.85) in the standard normal distribution. Consulting a z-table or using statistical software, we find that the z-score corresponding to 0.85 is approximately 1.036. Using the formula l = μ + z σnew, we calculate:
l = 120 + (1.036)(8.9443) = 120 + 9.267 = 129.267 mg/dl.
Therefore, the level l such that there is a probability of only 0.15 that the mean glucose level of 5 test results falls above l is 129.267 mg/dl.
True or false? In a two-column proof, the right column states your reasons.
At -70 ∘c and 5.2 atm, carbon dioxide is in which phase?
A phase diagram is a temperature vs pressure plot from which the phase of a compound can be deduced under the given temperature and pressure conditions. The 3 equilibrium curves: Solid-Gas, Liquid-Gas and Solid-Liquid separate the compound into the three states of matter. The 3 states can however coexist at a unique point referred to as the triple point.
Based on the phase diagram for CO2 (which is readily available online), at -70 C and 5.5 atm, CO2 exist as a solid.
How do you use the periodic table to recall the ionic charge of an alkali metal, an alkaline earth metal,or aluminum
The periodic table can be used to recall the ionic charge of alkali metals, alkaline earth metals, and aluminum by understanding the trends in the table.
Explanation:You can use the periodic table to recall the ionic charge of an alkali metal, alkaline earth metal, or aluminum by understanding the trends in the periodic table. The alkali metals (group 1) have a 1+ charge, alkaline earth metals (group 2) have a 2+ charge, and aluminum (group 13) has a 3+ charge. The ionic charges are determined by the number of electrons lost by the element.
For example, sodium, an alkali metal, has an atomic number of 11. It loses one electron and forms a cation with a 1+ charge. Calcium, an alkaline earth metal, has an atomic number of 20. It loses two electrons and forms a cation with a 2+ charge. Aluminum, in group 13, has an atomic number of 13. It loses three electrons and forms a cation with a 3+ charge.
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_______ is the classic structural formula for all the addictive narcotics
In a sample of solid ba(no3)2 the ratio of barium ions to nitrate ions is
In Ba(NO3)2, the ratio of barium ions (Ba²⁺) to nitrate ions (NO₃⁻) is 1:2. This is because each formula unit of this compound contains one Ba²⁺ ion and two NO₃⁻ ions.
Explanation:In a sample of solid Ba(NO3)2, the ratio of barium ions (Ba²⁺) to nitrate ions (NO₃⁻) is 1:2. This is because in each formula unit of Ba(NO3)2, there is one Ba²⁺ ion and two NO₃⁻ ions.
The subscript '2' after NO₃ in the formula indicates that two nitrate ions are associated with every one barium ion in this compound. Hence, for every single barium ion, there are two nitrate ions.
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If 100. mL of 0.400 M Na2SO4 is added to 200. mL of 0.600 M NaCl, what is the concentration of Na+ ions in the final solution? Assume that the volumes are additive.
The concentration of Na ion in the final solution is 0.66 M.
To calculate the concentration of Na ions in the solution, the moles of [tex]\rm Na_2SO_4[/tex] in the solution have been calculated.
Moles = molarity [tex]\times[/tex] volume (L)
The molarity of [tex]\rm Na_2SO_4[/tex] solution given is = 0.4
Volume of [tex]\rm Na_2SO_4[/tex] solution = 100 ml = 0.1 L.
Moles of [tex]\rm Na_2SO_4[/tex] = 0.4 [tex]\times[/tex] 0.1
Moles of [tex]\rm Na_2SO_4[/tex] = 0.04
The dissociation of [tex]\rm Na_2SO_4[/tex] will be as follows:
[tex]\rm Na_2SO_2\;\rightarrow\;2\;Na^+\;+\;SO_4^2^-[/tex]
1 mole of [tex]\rm Na_2SO_4[/tex] = 2 moles of Na ions.
0.04 moles of [tex]\rm Na_2SO_4[/tex] = 0.04 [tex]\times[/tex] 2
0.04 moles of [tex]\rm Na_2SO_4[/tex] = 0.08 moles of Na ions.
The moles of Na ions in NaCl solution will be:
Given, molarity of NaCl solution = 0.6 M
Volume of NaCl solution = 200 ml = 0.2 L.
Moles of Na ions in NaCl solution = 0.6 [tex]\times[/tex] 0.2
Moles of Na ions in NaCl solution = 0.12.
The dissociation of NaCl will be as follows:
[tex]\rm NaCl\;\rightarrow\;Na^+\;+\;Cl^-[/tex]
1 mole of NaCl = 1 mole of Na ions
0.12 moles of NaCl gives = 0.12 moles of Na ions.
Thus the total Na ions = Na ion in [tex]\rm Na_2SO_4[/tex] + Na ions in NaCl
Total moles of Na ions = 0.08 + 0.12
Total moles of Na ions = 0.2 moles.
The total volume of solution will be :
0.1 L [tex]\rm Na_2SO_4[/tex] + 0.2 L NaCl
= 0.3 L.
Concentration of Na ion in the final solution = [tex]\rm \dfrac{moles}{volume\;(L)}[/tex]
The concentration of Na ion in the final solution = [tex]\rm \dfrac{0.2}{0.3}[/tex] M
Concentration of Na ion in the final solution = 0.66 M.
The concentration of Na ion in the final solution is 0.66 M.
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The process by which a semipermeable membrane allows water molecules, small molecules, and ions to pass through while retaining large particles
What action of the body would be disrupted if atmospheric pressure was innapropiate?
Describe the relationship between hydrogen ions (h+) and ph. how is ph related to a solution's acideic
The pH range of acid is between 0-7 on pH scale while for base pH range is from 7-14. pH is a unitless quantity. The relationship between pH and hydrogen ions is pH=-log[H⁺].
What is pH?pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic. pH scale used to determine pH of a solution.
Mathematically the relation between hydrogen ion and pH is given as
pH=-log[concentration of hydrogen ion]
pH=-log[H⁺]
On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.
Therefore, the relationship between pH and hydrogen ions is pH=-log[H⁺].
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A compound has a formula mass of 61.98 amu and is comprised of atoms of sodium and oxygen in a definite ratio. the name of the compound described here is
Answer: The name of the compound sodium oxide.
Explanation: Sodium is Na and its atomic mass is 22.99 amu. Oxygen is O and its mass is 16.00 amu. Na is a first group metal with one valence electron where as oxygen is a non metal with six valence electrons. Na loses one electron to get its nearest noble gas configuration and oxygen accepts two electrons to get its nearest noble gas configuration. So, the charge for Na is +1 and the charge for O is -2.
For each oxygen atom, two atoms of sodium are required. Hence, formula of the compound is [tex]Na_2O[/tex] and its name is Sodium oxide.
Formula mass = [2(22.99)+16.00]amu
= (45.98 + 16.00)amu
= 61.98 amu
Nitrogen is naturally abundant in the atmosphere. Why are nitrogen fertilizers added to soil, despite the dangers they produce when they enter aquatic ecosystems?
Nitrogen fertilizers are added to soil to provide readily available forms of nitrogen that plants can use. However, when these fertilizers enter aquatic ecosystems through runoff, they can cause eutrophication and harm aquatic fauna.
Explanation:Nitrogen fertilizers are added to soil despite the dangers they pose to aquatic ecosystems because atmospheric nitrogen is not readily available for plants to use. Most plants require nitrogen in the form of nitrate or ammonium, which can be obtained from fertilizers. However, when these fertilizers enter aquatic ecosystems through runoff, they can cause eutrophication, leading to the overgrowth of microorganisms and the depletion of dissolved oxygen levels, which can be harmful to aquatic fauna.
Why are numbers in chemistry expressed in scientific notation?
What is a mixture?
A. Two compounds that chemically react
B. Compounds that cannot be separated from each other
C. Substances that are combined but do not chemically react
D. One substance that dissolves another substance
What information does the activity series of metals give?
There are various kind of elements that are present in periodic table. Some elements are metals, some are non metals, some are metalloids. Therefore, the activity series of metals compares the strength of reactivity of metals.
What is metal?Metals are those elements which is hard, conduct electricity, ductile, lustrous and malleable.
Lets take property
1.Since metals have free electrons that's why they can conduct electricity
2. Since atoms in metals are very closely packed in a definite crystal solid. It is not brittle that is it can not be broken down easily.
3. It does not react with water.
4.It is denser than water hence it sink in water.
The activity series of metals compares the strength of reactivity of metals.
Therefore, the activity series of metals compares the strength of reactivity of metals.
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In an open system, the vapor pressure is _____ the outside air pressure.
A. Higher
B. Lower
C. Equal
D. Below
The vapor pressure is EQUAL TO the outside air pressure.
Answer: Option (c) is the correct answer.
Explanation:
In an open system, the vapor pressure is equal the outside air pressure because there can be mass transfer or energy transfer from the atmosphere to the system as the system is open.
Whereas in a closed system there cannot be mass transfer or energy transfer from the system to the surrounding or vice versa.
Thus, we can conclude that option (c) is the correct answer.
You have prepared a saturated solution of x at 20∘c using 37.0 g of water. how much more solute can be dissolved if the temperature is increased to 30∘c?
To the prepared solution at [tex]\rm 20^\circ C[/tex] the extra mass of x to be added to the solution at [tex]\rm 30^\circ C[/tex] will be 4.44 g.
The complete question has given:
Solubility of x/100 g water at [tex]\rm 20^\circ C[/tex] = 11
Solubility of x/100 g water at [tex]\rm 30^\circ C[/tex] = 23
Now, since the saturated solution at [tex]\rm 20^\circ C[/tex] will use 37 g of water. The mass of x in the saturated solution will be :
Mass of x = [tex]\rm \dfrac{solubility\;of\;x\;\times\;mass\;of\;water}{100}[/tex]
Mass of x at [tex]\rm 20^\circ C[/tex] = [tex]\rm \dfrac{11\;\times\;37}{100}[/tex] g
Mass of x at [tex]\rm 20^\circ C[/tex] = 4.07 g.
The mass of solute at [tex]\rm 30^\circ C[/tex] will be = [tex]\rm \dfrac{23\;\times\;37}{100}[/tex] g.
The mass of solute at[tex]\rm 30^\circ C[/tex] = 8.51 g.
The extra mass of x to be added to the solution will be = 8.51 - 4.07 g.
The extra mass of x to be added to the solution will be 4.44 g.
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using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. I already know that it is Calcium chloride but I don't have the answer completely worked out. can someone help explain it please? thank you
Answer:
Calcium chloride
Explanation:
Colligative property depends upon number of particles. The colligative property is independent of the nature of solute present in a solution.
More the number of particles larger the colligative property.
The following are colligative property
a) depression in freezing point
b) elevation in boiling point
c) relative lowering of vapor pressure
d) osmotic pressure
Thus if we wish to melt the we will take calcium chloride as it will give more number of ions per molecules as compared to sodium chloride.
Aerozine 50 is made of 50 percent Hydrazine and 50 percent UDMH, but since they both make up one liquid fuel, how do they combine them to make a homogenous mixture? They both have different densities and are not bonded together to form Aerozine 50, so how is the mixture made to be perfectly mixed?