Predict which substance has greater molar entropy. Explain.(c) CH₄(g) or CCl₄(l)
Answers
CH4 (g) will have greater molar entropy than CCl4 (l) since entropy increases with rise in temperature.
Any substance's normal molar entropy rises as the temperature rises. Temperature of a Single Substance and Entropy. ” Entropy increases significantly when a substance moves from solid to liquid or from liquid to gas. In comparison to the entropy of the liquid, the gas has a higher entropy. Entropy therefore rises in reactions that result in gaseous products from solid or liquid reactants. Entropy also rises when liquid products are produced from solid reactants.
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Related Questions
What is the molarity (M) of 250.0 mL of an aqueous solution that has 101.00 g of KCI dissolved?
(Answer must include correct units and sigfigs -- Always write the numerical value followed by 1 space followed by the unit)
Also: if the answer is less than 1, write a zero followed by the decimal point
K = 39; CI = 35
Answers
The molarity of the solution is 5.428 M, with 4 significant figures.
To calculate the molarity of a solution, we need to know the amount of solute (in moles) and the volume of the solution (in liters).
Molarity = moles of solute / volume of solution in liters
First, we need to calculate the amount of KCI in moles:
Mass of KCI = 101.00 g
Molar mass of KCI = 39 + 35.5 = 74.5 g/mol
Number of moles of KCI = mass / molar mass = 101.00 g / 74.5 g/mol = 1.357 mol
Next, we need to convert the volume of the solution to liters:
Volume of solution = 250.0 mL = 0.250 L
Finally, we can calculate the molarity:
Molarity = 1.357 mol / 0.250 L = 5.428 M
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HELP!!
need correct answer..
Directions: Write True if the statement is correct and False if the
statement is incorrect.
21. An ecosystem is where both biotic factor such as
plants, animals and other organisms and abiotic factor like weather
(temperature and humidity) and landscape (rocks, soil, etc.) work
together.
22. Intertidal zone are areas where salt water and fresh
water meets (brackish water).
23. Water in estuaries is less salty.
24. Organisms does not require energy to perform life
activities.
25. Intertidal zones are area where the presence of water
depends on the tides.
26. Producer are organisms that produce food from
sunlight and inorganic substances.
27. Food chain is a series of transfer of energy as the
algae can be eaten by small fish and small fish may be eaten by a
carnivorous fish.
28. Decomposers are organisms that eat food scraps and
left-overs.
29. Consumers are organisms that eat other organisms.
30. A food web is composed of different food chains.
Answer my question pls!!
spam/unhelpful/incorrect/not sure = REPORT!!
Answers
Answer:
21: True
22: False
23: True
24: False
25: False
26: True
27: True
28: False
30: True
Explanation: Hope this is helpful :)
a student finds an unlabeled bottle of liquid under his kitchen sink. which investigation would best help him identify the unknown liquid as acidic, basic, or neutral?
Answers
Titration is the best investigation to identify an unknown liquid as acidic, basic, or neutral by measuring its pH level.
A student finds an unlabeled bottle of liquid under his kitchen sink. Titration is the investigation that would best help him identify the unknown liquid as acidic, basic, or neutral.
Titration is the chemical method used to find the amount of acid or base in a given substance. This method is a laboratory technique used to measure the concentration of a known solution (the titrant) with a solution of an unknown concentration (the analyte).
The unknown solution is slowly added to the known solution until it reacts completely, allowing us to calculate the concentration of the unknown solution. Titration may be used to identify an unknown solution as acidic, neutral, or basic by determining its pH level. It's a highly precise technique that's often used in analytical chemistry laboratories to measure the concentration of chemicals.
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When comparing bromine to chlorine, bromine has
A. Fewer protons in its nucleus.
B. A weaker effective nuclear charge
C. More valence electrons
D. More electron shielding
Answers
Explanation:
I'm pretty sure the answer is D
PLESE HELP! Which of the following sugar solutions is the most concentrated?
Select one:
a. 25 g of sugar in 60 mL of water
b. 2 g of sugar in 100 mL of water
c. 15 g of sugar in 25 mL of water
d. 12 g of sugar in 30 mL of water
Answers
c.15gof in25mlof wather
The sugar solution that is the most concentrated is 15 g of sugar in 25 mL of water.
CONCENTRATION:
The concentration of a solution is related to the amount of a substance and its volume. The concentration of a solution is directly proportional to the amount of a substance but inversely proportional to the volume. This means that the concentration increases with an increasing amount of substance but decreases with an increasing volume. According to this question, 15g of sugar is the highest amount and it dissolves in 25mL of water, which is the lowest volume. Therefore, it is the most concentrated sugar solution.Learn more at: https://brainly.com/question/202460?referrer=searchResults
Brainliest to first decent answer
What is the chemical formula for the molecule represented by the model?
CHO
C4H9O2
C4H8O
C3H8O2
Answers
The correct formula of the molecule is C4H9O2.
What is a model?The model of a compound is a representation of the molecule. It gives us an idea of what the molecule looks like as well as its molecular formula.
Looking at the structure of the compound as shown in the model in the question, the correct formula of the molecule is C4H9O2.
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Answer:C4H9O2.
Explanation:
If the gas pressure of 25 atm , a tem of 35 k volume of 26 liters but the tem changes to 67k and the volume changes to 80 liters what is the new pressure ?
Answers
The ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
P = (nRT) / V
Since we are given the initial pressure, temperature, and volume, we can plug those values into the equation to find the initial number of moles of gas:
n = (PV) / (RT)
n = (25 atm * 26 L) / (0.0821 L*atm/mol*K * 35 K)
n = 23.82 mol
The same equation with the new temperature and volume to the new pressure:
P = (nRT) / V
P = (23.82 mol * 0.0821 L*atm/mol*K * 67 K) / 80 L
P = 16.13 atm
And the new pressure is 16.13 atm.
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Determine the mass of zirconium_______________, silicon__________________, and oxygen________________, found in 0.3384 mol of zircon, ZrSiO4, a semiprecious stone. Your answer must have the correct number of significant figures.Enter the number only, with no units.
Answers
1) Determine the mass of zirconium
Convert moles of zircon into moles of zirconium
\(\text{molesofZr}=0.3384molesofZrSiO_4\cdot\frac{1\text{molofZr}}{1molofZrSiO_4}=0.3384\text{molesofZr}\)Convert moles of zirconium into mass of zirconium (g)
\(\text{gramsofZr}=0.3384\text{molesZr}\cdot\frac{91.224\text{ g Zr}}{1\text{molofZr}}=30.87\text{ g Zr}\)2) Determine the mass of Silicon
Convert moles of zircon into moles of silicon
\(\text{molesofSi}=0.3384molesofZrSiO_4\cdot\frac{1\text{molofSi}}{1molofZrSiO_4}=0.3384\text{molesofSi}\)Convert moles of silicon into mass of silicon (g)
\(\text{gramsofSi}=0.3384\text{molesofSi}\cdot\frac{28.085\text{ g of Si}}{1\text{molofSi}}=9.504\text{ g Si}\)3) Determine the mass of Oxygen
Convert moles of zircon into moles of oxygen
\(\text{molesofO}=0.3384molesofZrSiO_4\cdot\frac{4\text{molofO}}{1molofZrSiO_4}=1.3536\text{molesofO}\)Convert moles of oxygen into mass of oxygen
\(\text{gramsofO}=1.3536\text{molesofO}\cdot\frac{15.999\text{ g O}}{1\text{mol of O}}=21.66gO\)The mass of zirconium is 30.87 g
The mass of silicon is 9.504 g
The mass of oxygen is 21.66 g
how many elements have been discovered so far by scientists
Answers
Answer:
118 elements have been discovered so far
Explanation:
Which set of elements makes up 95% of the Earth A Iron, Calcium, Silicon and Carbon Oxygen, Carbon, Silicon and Iron C Oxygen, Magnesium, Iron and Silicon D Hydrogen, Helium, Silicon and Carbon
Answers
Oxygen, Magnesium, Iron, and Silicon are the set of elements that makes up 95% of the Earth. Among these Oxygen is the most abundant element, comprising about 47% of the Earth's mass.
These four elements make up approximately 95% of the Earth's composition. Oxygen is the most abundant element, comprising about 47% of the Earth's mass. Magnesium, Iron, and Silicon are also significant constituents, with Magnesium accounting for about 27%, Iron for approximately 6%, and Silicon for around 8% of the Earth's composition.
While Carbon is indeed an essential element for life and is present in various forms on Earth, its abundance in the Earth's overall composition is relatively low compared to Oxygen, Magnesium, Iron, and Silicon. Hydrogen and Helium, mentioned in option D, are lighter elements and are more prevalent in the composition of the Sun and other celestial bodies, rather than the Earth itself.
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at the ______________, the molecule (for example an amino acid) has no electric charge or is electrically neutral.
Answers
At the molecular level, the concept of electric charge is significant in understanding the interactions between atoms and molecules. A molecule is a group of atoms bonded together, and its charge depends on the distribution of electrons within the molecule. A molecule can be electrically neutral, positively charged, or negatively charged.
In the case of an electrically neutral molecule, such as an amino acid, the molecule has no net charge. This means that the number of protons, which carry a positive charge, is equal to the number of electrons, which carry a negative charge. The positive and negative charges cancel each other out, resulting in an overall neutral charge. The neutrality of a molecule is crucial in determining its properties and behavior. Electrically neutral molecules tend to be less reactive than charged molecules because they lack the electrostatic force that attracts or repels charged particles. This allows neutral molecules to interact more easily with other neutral molecules and remain stable in their environment.
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what is a chemical substance that cannot be broken down into another chemical substance
Answers
A chemical substance that cannot be broken down into simpler substances by chemical means is called an "element."
Elements are the fundamental building blocks of matter and are composed of only one type of atom. Each element is represented by a unique chemical symbol, such as H for hydrogen, O for oxygen, and Au for gold.
The simplest and most fundamental types of matter are elements, which nonetheless have their chemical characteristics. According to their atomic number and other characteristics, they are arranged in the periodic table. There are currently 118 known elements, and each one has unique properties and behaviors.
A few examples of elements are gold (Au), iron (Fe), carbon (C), nitrogen (N), carbon (C), oxygen (O), and hydrogen (H). Elements are the fundamental building blocks of all chemical substances and are essential for chemical reactions as well as the synthesis of molecules and compounds.
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The concentration of citric acid (H3C6H5O7) in citric fruits ranges from 0.005 M to 0.30 M. Consider a 90.2 mL sample of pure lime juice with a citric acid concentration of 0.158 M. How many moles of citric acid are in the sample?
Answers
Answer:
There are 0.0142 moles of citric acid in the sample.
Explanation:
Molar concentration, also called molarity, is a measure of the concentration of a solute in a solution, and is defined as the number of moles of solute that are dissolved in a given volume.
In other words, molarity is defined as the amount of solute per unit volume of solution and is calculated by dividing the moles of the solute by the liters of the solution:
\(molarity=\frac{number of moles}{volume}\)
Molarity is expressed in units \(\frac{moles}{liter}\) .
In this case:
molarity= 0.158 Mnumber of moles= ?volume= 90.2 mL= 0.0902 L (being 1,000 mL= 1 L)Replacing:
\(0.158 M= 0.158 \frac{moles}{liter} =\frac{number of moles}{0.0902 liter}\)
Solving:
number of moles= 0.158 \(\frac{moles}{liter}\) *0.0902 liters
number of moles= 0.0142
There are 0.0142 moles of citric acid in the sample.
Choose a federal law from the list below.
Clean Air Act
Clean Water Act
Endangered Species Act
Pollution Prevention Act
Research the law using the library and other resources. Write a 500 word report describing the law, who or what it protects, and why it was enacted. Be sure to include when the law was first passed, which groups supported it, which groups opposed it, and any recent modifications. Write your report in the essay box below.
Answers
The principal law governing pollution of the nation’s surface waters is the Federal Water
Pollution Control Act, or Clean Water Act. Originally enacted in 1948, it was totally revised by
amendments in 1972 that gave the act its current dimensions. The 1972 legislation spelled out
ambitious programs for water quality improvement that have since been expanded and are still
being implemented by industries and municipalities.
This report presents a summary of the law, describing the statute without discussing its
implementation. Other CRS reports discuss implementation, including CRS Report R42883,
Water Quality Issues in the 113th Congress: An Overview, and numerous products cited in that
report.
The Clean Water Act consists of two major parts, one being the provisions which authorize
federal financial assistance for municipal sewage treatment plant construction. The other is the
regulatory requirements that apply to industrial and municipal dischargers. The act has been
termed a technology-forcing statute because of the rigorous demands placed on those who are
regulated by it to achieve higher and higher levels of pollution abatement under deadlines
specified in the law. Early on, emphasis was on controlling discharges of conventional pollutants
(e.g., suspended solids or bacteria that are biodegradable and occur naturally in the aquatic
environment), while control of toxic pollutant discharges has been a key focus of water quality
programs more recently.
Prior to 1987, programs were primarily directed at point source pollution, that is, wastes
discharged by industrial and municipal facilities from discrete sources such as pipes and outfalls.
Amendments to the law in that year authorized measures to address nonpoint source pollution
(runoff from farm lands, forests, construction sites, and urban areas), which is estimated to
represent more than 50% of the nation’s remaining water pollution problems. The act also
prohibits discharge of oil and hazardous substances into U.S. waters.
Under this act, federal jurisdiction is broad, particularly regarding establishment of national
standards or effluent limitations. Certain responsibilities are delegated to the states, and the act
embodies a philosophy of federal-state partnership in which the federal government sets the
agenda and standards for pollution abatement, while states carry out day-to-day activities of
implementation and enforcement.
To achieve its objectives, the act is based on the concept that all discharges into the nation’s
waters are unlawful, unless specifically authorized by a permit, which is the act’s principal
enforcement tool. The law has civil, criminal, and administrative enforcement provisions and also
permits citizen suit enforcement.
Financial assistance for constructing municipal sewage treatment plants and certain other types of
water quality improvements projects is authorized under Title VI. It authorizes grants to capitalize
State Water Pollution Control Revolving Funds, or loan programs. States contribute matching
funds, and under the revolving loan fund concept, monies used for wastewater treatment
construction are repaid to states, to be available for future construction in other communities.
When 0. 4g of zinc trioxocarbonate (IV) reacted with dilute hydrochloric acid, zin chloride wa produced and carbon (IV) oxide evolved if the reaction took 2minute. What wa the rate of the reaction
Answers
The rate of reaction when 0. 4g of zinc trioxocarbonate (IV) reacted with dilute hydrochloric acid, zin chloride was produced and carbon (IV) oxide evolved if the reaction took 2minute is 0.0016 mol/min
The rate of reaction is the time taken for product molecules to appear or the time taken for reactant molecule to be converted and the rate of reaction = mole of product formed/time taken
And the equation of the reaction is
ZnCO₃ + 2HCl → ZnCl₂ + H₂O + CO₂
And the molar mass of zinc carbonate = 125.39 = 8g/mol
Mole of zinc carbonate converted = 0.4/125.38
Time taken = 2 min
Rate of reaction = 0.0032/2
Rate of reaction = 0.0016 mol/min
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The increased electron density along the internuclear axis is called a n bond.a. Trueb. False
Answers
Answer:
The increased electron density along the internuclear axis is called a n bond. a. True b. False
B. False
Explanation:
a student mixed 20.0 cm3 of water with 20.0 cm3 of ethanol and found the resultant volume to be 38.7 cm3. calculate the density of the resultant mixture. (note: density of water is 1.00 g cm–3 and density of ethanol is 0.789 g cm–3.)
Answers
The density of the resultant mixture is 0.925 g/cm³.
What is the mass of each component of the mixture?
The mass of each component of the mixture is calculated as follows;
m = ρV
where;
ρ is densityV is volumemass of water = 20 cm³ x 1 g/cm³ = 20 g
mass of ethanol = 20 cm³ x 0.789 g/cm³ = 15.78 g
Total mass of the mixture = 20 g + 15.78 g = 35.78 g
The density of the mixture is calculated as follows;
Density of the mixture = total mass / total volume
Density of the mixture = (35.78 g) / (38.7 cm³) = 0.925 g/cm³
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10 g of copper is heated and the mass increases to 12.5 g. What is the mass of the copper in the new substances?
Answers
Answer:
10g
Explanation:
The amount of copper in the heated mass of the new substance produced is still 10g because in any chemical action, mass is always conserved.
According to the law of conservation of matter "matter is neither created nor destroyed in a chemical reaction". The change in mass is only due to oxygen gas that combines with the new copper formed or other substances that joined the mass. The substance will still have the same amount of copper as the original one. Since we started with 10g of copper, we end with 10g of copper.Which statement best describes the atoms in a gas?
Answers
Answer:
They move freely in all directions.
Explanation:
In the number 300 point there are three significant digits
Answers
The number of significant digits in the number 300 is three significant digits.
What are significant digits?In positional notation, significant figures or significant digits are the digits in a number that is trustworthy and required to denote the amount of something.
There are rules regarding significant digits and they are as follows:
The significance of all non-zero digits is constant.Interior zeros (zeroes in the middle of non-zero numbers) are significant300 (3 sig. figs.) 0.03403 (4 sig. figs.), and 00674 (6 sig. figs.)Leading zeros (zeroes at the start of a number) are not significant.Learn more about significant figures at: https://brainly.com/question/24630099
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A rectangular freshwater fish tank is 60.00 cm long, 200.00 mm wide, and 200.00 m deep. What is the mass of the water it can hold?
1 cm3 = 1 mL
The density of freshwater is 1.00 g/mL.
a
2,400,000 grams
b
2400 grams
c
2.4 grams
d
0.240 grams
e
8,400,000 grams
f
8200 grams
g
8.2 grams
h
0.820 grams
Answers
Explanation:
first volume=l×b×h
mass=density × volume
24000000 gm
Coenzymes such as ___________ are used to carry electrons to and from many kinds of oxidation/reduction reactions.
Answers
Coenzymes such as NADH and FADH2 are used to carry electrons to and from many kinds of oxidation/reduction reactions.
What are coenzymes?
A macromolecule that catalyses a chemical process is an enzyme. In other words, it creates the possibility of a negative reaction. Smaller molecules are used to construct enzymes to create an active component. The coenzyme is one of an enzyme's most crucial components.
Small molecules make up coenzymes. They are unable to catalyse reactions on their own, but they can assist enzymes in doing so. Coenzymes are organic nonprotein molecules that join with the protein molecule (apoenzyme) to create the active enzyme, according to the technical definition (holoenzyme).
In biological oxidation-reduction reactions, NADH and FADH2 are two coenzymes that are extremely important. Along with the transfer of electrons, hydrogen ions also occur.
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Which of the following describes a disconfirmed hypothesis?
it has been proven true
it has been poorly written and needs to be reformed
it has been proven false
it is not testable
Answers
OSTOICHIOMETRY
Using molarity to find solute moles and solution volume
A chemist adds 440.0 mL of a 1.46M barium acetate
added to the flask. Round your answer to 3 significant digits.
mol
be (Ba(C₂H₂O₂),) solution to a reaction flask, Calculate the millimoles of barium acetate the chemist has
X
Calculator
542400
Maribel V
do
Answers
The chemist has 642.4 millimoles of barium acetate in the solution.
To calculate the millimoles of barium acetate (Ba(C₂H₃O₂)₂) in the solution, we can use the formula:
moles = molarity × volume (in liters)
First, let's convert the volume from milliliters (mL) to liters (L):
440.0 mL ÷ 1000 = 0.440 L
Now we can substitute the given values into the formula:
moles = 1.46 M × 0.440 L
moles = 0.6424 mol (rounded to 4 decimal places)
To convert the moles to millimoles, we multiply by 1000:
millimoles = 0.6424 mol × 1000
millimoles = 642.4 mmol (rounded to 3 significant digits)
Therefore, the chemist has 642.4 millimoles of barium acetate in the solution.
It's important to note that the molarity (M) represents the number of moles of solute per liter of solution. By multiplying the molarity by the volume in liters, we can find the number of moles of solute. To convert moles to millimoles, we multiply by 1000. The result represents the millimoles of barium acetate present in the given volume of solution.
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explain what keeps the electrons confined in the space surrounding the nuleus
Answers
Answer:
Electrons are trapped inside the atom because of the attraction forces with positively charged protons that are found in the nucleus.
Explain how the water cycle is a reversible process.
Answers
Answer:
The water cycle is a series a of reversible changes. The sea water under the action of heat get vaporised which in turn changes into clouds. These clouds provide rain. The rain water then flows to the streams and rivers which eventually falls back to the oceans and seas.
Detergent is an example of what type of compound?
A.) synthetic organic compound
B.) organic compound
C.) chlorofluorocarbon
Answers
Answer : A
Explanation : Surface-active compounds/agents (surfactants) Substances which have the effect of reducing the surface tension of a solvent, an example being a detergent/surfactant or soap dissolved in water. ... Both synthetic detergents and soaps are surfactants. Surfactants See "Surface-active compounds/agents".
According to the context, a detergent is an example of a synthetic organic compound.
What is a detergent?They are a group of synthetic organic compounds that have the property of lowering the surface tension of the liquids in which they are dissolved.
These contain surfactant substances that help in penetration, soaking, emulsification, dispersion, solubilization.
Therefore, we can conclude that according to the context, a detergent is an example of a synthetic organic compound.
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determine how many electrons need to be removed from boron and how many electrons need to be added to selenium to form noble gas configurations
Answers
3 electrons need to be removed from boron, and 2 electrons are added to selenium to form noble gas configurations.
Ionic compounds are compounds that are made up of ions, which are charged particles that occur when an atom (or group of atoms) gains or loses its electrons. An ion with a positive charge is called a cation, and an ion with a negative charge is called an anion. Boron is a Metalloid chemical element that has the symbol "B" and the atomic number 5, whereas Selenium is a chemical element that has the symbol "Se" and the atomic number 34.
The electron configurations:
B = [He] 2s2 2p1
The number of valence electrons for each neutral atom:
B = 3 valence electrons
Se = 6 valence electrons
B has a noble gas configuration of [He] when 3 electrons are removed, and Se has a noble gas configuration of [Kr] when 2 electrons are added.
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Diastolic Blood Pressure of Females For the diastolic blood pressure measurements of females listed in Data Set 1 "Body Data" in Appendix B, the highest measurement is 98 mmHg. The 147 diastolic blood pressure measurements of females have a mean of
x
ˉ
=70.2 mmHg and a standard deviation of s=11.2 mmHg. a. What is the difference between the highest diastolic blood pressure and the mean of the diastolic blood pressures for females? b. How many standard deviations is that [the difference found in part (a)]? c. Convert the highest diastolic blood pressure to a z score. d. Using the criteria summarized in Figure 3-6 on page 123, is the highest blood pressure significantly low, significantly high, or neither?
Answers
The mean of the diastolic blood pressures for females is 98 - 70.2 = 27.8 mmHg. The highest diastolic blood pressure is significantly high.
a. The difference between the highest diastolic blood pressure and the mean of the diastolic blood pressures for females is 98 - 70.2 = 27.8 mmHg.
b. The difference found in part (a) is 27.8 mmHg, and the number of standard deviations is 27.8/11.2 ≈ 2.48.c. To convert the highest diastolic blood pressure to a z score, we use the formula:z = (x - µ)/σ,where x is the value, µ is the mean, and σ is the standard deviation.z = (98 - 70.2)/11.2 ≈ 2.48d. Using the criteria summarized in Figure 3-6 on page 123, a z score of 2.48 is significantly high. Therefore, the highest diastolic blood pressure is significantly high.
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How many unpaired electrons are in the ground state electron configuration 4s23d9?
Answers
ANSWER
The number of the unpaired electrons is 1
STEP-BY-STEP EXPLANATION:
The electronic configuration of a particular element is given below as
\(4s^23d^9\)From the electronic configuration above, you will see that the 4s-orbital has two electrons and the 3d-orbital has 9 electrons
According to Hund's Rule, it "states that electron goes into orbital singly before pairing commences."
To determine the number of unpaired electrons, we need to study the total number of electrons in the d-orbital as given by the question.
Note that, the maximum number of electrons that can enter into the d-orbital is 10
The next step is to fill in the electrons into the orbital
From the above structure, you will see that the number of paired electrons is 4 and the number of unpaired electrons is 1
Therefore, the number of the unpaired electrons is 1
