Answer:
Frozen water(ice) indeed takes up a larger volume than water in liquid state.
Explanation:
This is because when water liquid turns into a solid, energy is absorbed hence it gets cooler, the bonds are strengthen and expands to its maximum.
this means that the structure changes when water turns to ice, from the semi random arrange in liquid state to lattice in ice. this expansion between the molecules have alot of space between it, the molecules are less compact.
Since the molecules are less compact, ice is therefore less dense than water, hence it floats on water and not sink.
And this almost means that ice increases in volume by approximately 9% than its initial liquid water.
what has been causing the co2 level of the atmosphere to increase over the past 200 years? select all that apply.
The factor that has been causing the co2 level of the atmosphere to increase over the past 200 years are:
DeforestationPlant decompositionThe combustion of fossil fuelsWhy has CO2 in the atmosphere increased over the past years?The primary cause of the rise in carbon dioxide concentrations is the use of fossil fuels by humans as a source of energy. We are adding carbon to the atmosphere in only a few hundred years that plants removed from the atmosphere through photosynthesis over many millions of years in the form of fossil fuels like coal and oil.
Note that according to climate experts, the earth is currently 1 degree Celsius hotter than it was between 1850 and 1900, and part of the reason for this is due to gas emissions from airplanes, cars, and other human activities.
Hence, one can say that Greenhouse gas concentrations have increased due to human activity. Burning fossil fuels like coal and oil has increased the amount of carbon dioxide in the atmosphere during the past century (CO2).
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See full question below
What has been causing the CO2 level of the atmosphere to increase over the past 200 years?
Select all that apply.
Hint 1. How CO2 Is Not Released into the Atmosphere
If carbon dioxide is absorbed by another material, then that carbon dioxide is sequestered from the atmosphere unless something happens to release it from the absorbing material.
to a 1 l solution of 0.1 m acetic acid solution, 20 g of sodium acetate is dissolved. what is the ph of the solution
The pH of the given solution would be 4.75.
What do you mean by pH?
pH is a measure of the acidity or alkalinity of a solution, usually expressed on a scale from 0 to 14. A pH of 7 is neutral, with solutions below 7 being acidic and solutions above 7 being alkaline.
The pH of the solution can be calculated using the Henderson-Hasselbalch equation:
pH = pKa + log([salt]/[acid])
Where pKa is the -log of the acid dissociation constant (in this case, 4.75 for acetic acid), [salt] is the molar concentration of the salt (in this case, 0.1 M for sodium acetate), and [acid] is the molar concentration of the acid (in this case, 0.1 M for acetic acid).
Plugging in the values, we get
pH = 4.75 + log(0.1/0.1)
pH = 4.75
Therefore, the pH of the solution is 4.75.
What is an acetic acid solution?
An acetic acid solution is a solution made up of acetic acid and water. Acetic acid, also known as ethanoic acid, is an organic acid which is the main component of vinegar. It has a strong, pungent odor and sour taste, and is used in many household products and industrial applications.
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If a system has 325 kcal
of work done to it, and releases 5.00×102 kJ
of heat into its surroundings, what is the change in internal energy (Δ or Δ)
of the system?
Internal energy of the system is 1278 kJ.
What is Internal Energy?
It refers to the intangible microscopic energy at the atomic and molecular scales, which is distinct in scale from the macroscopic organised energy associated with moving objects. For instance, a glass of water on a table at room temperature appears to have no apparent energy, either potential or kinetic.
∆U = w + q
U = modification of internal energy =?
W = work equals +425 kcal (positive sign because work is done on the system)
lthough I'm not sure you intended to use separate units (kcal and kJ), I'll presume you did so in order to solve the problem. Don't convert them if they should be the same, such as in the case of kJ.
425 kcal plus 4.184 kJ per kcal equals 1778 kJ of labor, or w.
∆U = +1778 + (-500 kJ) (-500 kJ)
∆U = +1278 kJ
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which two steps of the 8-step practical problem solving method fit within the orient process of the ooda loop?
For a fundamental breakdown of how to fix problems and lead your manufacturing team to success, here are the two steps of the problem-solving process.
Identify the Problem.
Define the Problem.
The eight-step problem-solving process is a structured method that guides you through the various steps of solving issues.
Unlike other problem-solving processes that are often broad, the eight-step method takes you through each individual step, from identifying the problem to taking actionable steps to success.
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nuclear decay occurs according to first-order kinetics. scandium-43 decays with a rate constant of 0.178 days–1. after 15.0 days, a sample has a mass of 1.73 g. what was the original mass of the sample?
The sample's initial mass is 25.0 g if first-order kinetics is what nuclear decay is said to follow.
explain nuclear power.Nuclear energy is the force that exists in a protons and neutrons, or core. The atoms that make up everything in the universe are minute building blocks, and energy holds the nucleus of each atom together.
What happens in the event of a bombing of a nuclear power plant?A nuclear facility meltdown or explosion might release a significant amount of radioactive material into the atmosphere. Everyone present at the nuclear site would have most certainly been injured or poisoned in the event of an explosion.
Briefing: The following is the expression for the rate rule for first order kinetics:
Where k = rate constant = 0.178 days, t = 2.303/k * log(a/(a - x))
15 days have passed since the sample began, so t 1
a = the reactant's original or initial amount; a - x = the amount left over after the decay process; 1.73g
After plugging in all the values, we get 15=(2.303/0.178) A/1.73 = 10 * log (a/1.73) log (a/1.73) = 15 * 0.178/2.303 ( 15*0.178/2.303)
a = 1.73 * 10^( 2670/2303)\sa = 1.73 * 10^(1.15935736)\sa = 1.73 * 14.433024871\sa = 24.9691330268
Consequently, a weighs about 25 grams.
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help!!!!!!!!!!!!!!!!!!!!!!!!!
The mass of gallium that can be formed from the reaction of 198 g of strontium with excess molten gallium (III) nitrate is 105 g (Option C)
How do I determine the mass of gallium formed?The mass of gallium that can be formed from the reaction can be obtained as follow:
3Sr + 2Ga(NO₃)₃ → 3Sr(NO₃)₂ + 2Ga
Molar mass of Sr = 87.62 g/molMass of Sr from the balanced equation = 3 × 87.62 = 262.86 g Molar mass of Ga = 69.72 g/molMass of Ga from the balanced equation = 2 × 69.72 = 139.44 gFrom the balanced equation above,
262.86 g of Sr reacted to form 139.44 g of Ga
Therefore,
198 g of CrCl₂ will react to form = (198 × 139.44 ) / 246.86 = 105 g of Ga
Thus, the mass of Ga formed is 105 g (Option C)
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g if the particles in an electron/positron pair-production reaction have no kinetic energy, what is the frequency of the photon that did this, in hz?
Pair production is the process by which a neutral boson is converted into a subatomic particle and its antiparticle.
How much kinetic energy does an electron-positron have overall?The mass of the electron has an energy equivalent of 0.51, and the mass of the positron has an energy equivalent of 0.51 as well. Thus, the mass of the particles in the pair is produced using a total of 1.02 energy. The two particles share the remaining energy, 1.24, equally as kinetic energy.
What occurs to the positron following pair formation?The newly created positron is quickly converted back into photons after annihilating with another electron in matter.
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10. In a household radiator, 1000.g of steam at 100.°C condenses (changes from gas to
liquid). How much heat is released?
1000 g of water condenses at 100°C in a home radiator (changes from gas to liquid).
Equation
Q=m x Hvap
where m= mass.
= 1000. gx2260J/g
Q=2,260,000 J
What is Condensation?
Condensation, which is the opposite of vaporization, is the transformation of matter from its gaseous state into its liquid state. The water cycle is the most frequent use of the phrase. [1] Another way to describe it is as the transformation of water vapour into liquid water when it comes into touch with a solid, liquid, or cloud condensation nucleus in the atmosphere. Deposition is the term for the change that occurs when the gaseous phase directly transitions into the solid phase.
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The pic to the right shows you several organs working together including ur lungs, bronchi and trachea (windpipe) this means this pictures shows you an ?
The lungs, bronchi, and trachea seem to be cross-sectioned in the photo (windpipe). The respiratory system supplies oxygen and removes carbon dioxide, a waste product of cellular activity. The trachea transports air from the nose and mouth to the bronchi, which go to the lungs. The lungs exchange gases with the environment via breathing.
What is the respiratory system?Generally, The picture appears to show a cross-section of the human respiratory system, including the lungs, bronchi, and trachea (windpipe). The respiratory system is responsible for bringing oxygen into the body and removing carbon dioxide, a waste product of cellular metabolism.
The trachea is a tube that carries air from the nose and mouth to the bronchi, which are smaller tubes that branch off from the trachea and lead to the lungs.
The lungs are the primary organs of the respiratory system and are responsible for exchanging gases with the environment through the process of breathing.
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The element in group 14, period 3, of the periodic table is classified as a
Answer:
metalloid
Explanation:
Silicon. Silicon (symbol Si) is a group 14 metalloid.
the pka of acetic acid (hc2h3o2) is 4.8. what is the ph of a buffer that contains equal concentrations of hc2h3o2 and nac2h3o2? g
The pH of an acidic buffer that contains equal concentrations of HC2H3O2 and NaC2H3O2 is 4.8.
What is an Acidic Buffer?These solutions are employed to keep environments acidic, as their name suggests. A weak acid and its salt are combined with a strong base to create an acid buffer, which has an acidic pH. The pH of an acetic acid and sodium acetate solution in water is equivalent at 4.74.
These solutions have PH values below seven.
These solutions are made up of a weak acid and its salt.
A mixture of sodium acetate and acetic acid (pH = 4.75) serves as an illustration of an acidic buffer solution.
Given;
Pka of acetic acid is 4.8;
conc of ch3cooh = conc of ch3cooNa;
now,
[salt]/[acid] = 1
now from the formula,
PH = Pka + log([tex]\frac{conc of salt}{conc of acid}[/tex])
⇒PH = 4.8 + log(1)
⇒PH = 4.8 + 0
PH = 4.8
The pH of an acidic buffer that contains equal concentrations of HC2H3O2 and NaC2H3O2 is 4.8.
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What is the difference between changing a subscript in a chemical formula and changing a coefficient?.
Answer:
The chemical formula changes
if molecules of hydrogen, nitrogen, oxygen and chlorine have the same kinetic energy which molecule will be moving the fastest?
If molecules of hydrogen, nitrogen, oxygen, and chlorine have the same kinetic energy hydrogen molecule will move the fastest.
Kinetic energy will be defined as:
K.E = 1/2mv2
In the above-mentioned equation:
K.E = kinetic energy
m = mass of gas molecules
v = velocity of gas molecules
Gases with smaller particle sizes tend to be traveling quicker at a given temperature, which means that they have a greater speed. Kinetic energy enables gas particles to move at different rates, and these speeds are determined by the size of the gas particle. Hydrogen gas particles are the smallest and hence move at a faster rate, followed by nitrogen gas particles, oxygen gas particles, and chlorine gas particles.
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consider a phosphate buffer, consisting of h2po4- and hpo42- . initially at the same ph as its pka (6.86) when concentrated sodium hydroxide is added to this buffer, the: a. ph increases more than when an equal amount of equal amount of naoh is added to unbuffered water at ph 6.86 b. ph remains constant c. ratio of [hpo42-] to [h2po4] in the buffer increases d. ph increases more than when an equal amount of naoh is added to a phosphate buffer initially at ph 5.0
consider a phosphate buffer, consisting of h2po4- and hpo42- . initially at the same ph as its pka (6.86) when concentrated sodium hydroxide is added to this buffer, the: Option C ratio of [hpo42-] to [h2po4] in the buffer increases
The buffer's HPO42-to-H2PO4-ratio increases. Because NaOH reacts with H2PO4- and academic papers proton for neutralisation. Buffer Solution is a liquid solvent-based solution made up of a weak acid base, or a weak base and its conjugate acid. They are resilient to pH changes caused by dispersion or the addendum of small quantities of acid/alkali to companions. Water acts as a buffer, albeit a poor one. This is because of the fact that H20 ionises to shape H30+ and OH-. A weak acid and the conjugate acid are required to form an acid solution buffer. For alkali, the opposite is true.
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What is the correct formula for the product of the combination reaction between calcium metal and oxygen gas?.
Oxygen and calcium react to generate calcium oxide. The chemical made of calcium and oxygen has the formula CaO. This reaction's chemical formula is 2Ca + O2 2CaO.
What are the eight different kinds of chemical reactions?the eight types of chemical reactions that are most frequently encountered are: decomposition reaction, combination reaction, combustion reaction, single displacement reaction, double displacement reaction, precipitation reaction, and redox reaction.
What four traits do chemical reactions have?The evolution of a gas, precipitate formation, color change, temperature change, and state change are significant aspects.
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If you think about the water molecules as liquid water freezes, would you say they get closer together, further apart, or stay at about the same distance from one another?
Answer:Water is unusual because its molecules move further apart when it freezes. The molecules of just about every other substance move closer together when they freeze.
Explanation:
During freezing, water molecules lose energy and do not vibrate or move around as vigorously. This allows more stable hydrogen-bonds to form between water molecules, as there is less energy to break the bonds.
Which characteristics would be present in an air mass that develops over the Caribbean Sea near the equator?
what is the edge length of a body-centered cubic unit cell made up of atoms that each has a radius of 178 pm ?
The edge length of a body-centered cubic unit cell made up of atoms of radius 178 pm is 411.074 pm.
The body-centered cubic unit cell is defined as an unit cell that has atoms at each of the eight corners of a cube (like the cubic unit cell) plus one atom present in the center of the cube. Each of the corner of atoms is the corner of another cube so the corner atoms are shared among eight unit cells.
Length of body diagonal = r + 2r + r
= 4r
From the cube, body diagonal = √(3) a
∴ 4r = √(3) a
Where:
a: is the edge length
R: is the radius of each atom = 178 pm
By solving equation the equation for "a" we have:
a = 4r/√(3)
⇒ a = (4 × 178)/√(3)
⇒ a = 411.074 pm
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how many moles of a gas of molar mass 18.0 g/mol and rms speed 675 m/s does it take to have a total average translational kinetic energy of 42 kj
The number of gas moles of molar mass 18g is 0.010moles.
Molar Mass is 18g and RMS speed 657 m/s , Kinetic energy is 42kj
The mole is a unit of measurement or the starting point for determining how much of a substance is present in a given sample. The Avogadro's constant, or 1 mole, is a quantity that is equal to 6.022 x 1023 particles. These particles can be of any species, e. g atoms, molecules, electrons, protons, neutrons, etc.The Avogadro's constant, 6.022 x 1023, is actually based on the quantity of atoms in 12g of the carbon-12 isotope. Where 12gm is the molar mass of 12C, or in other words, the mass of 1 mole or 6 point022 x 1023 atoms of the 12C isotope of Carbon.[tex]K.E=mv^2/2[/tex]42000=m(675 x 675)/2
m=84000/675²
=0.1843g
To find number of moles -
[tex]n=m/M[/tex]
n=calculated mass/Molar Mass
=0.010 moles
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Who is the atom from the other end of town?
Answer:
The Atom is a superhero character from DC Comics. He is a founding member of the Justice League and possesses the ability to shrink himself to subatomic size. In the comics, he is Ray Palmer, a scientist from Ivy Town.
Explanation:
2.2 using the bonding model for a semiconductor, indicate how one visualizes (a) a miss-ing atom, (b) an electron, (c) a hole, (d) a donor, (e) an acceptor.
Using a ball and stick figure, it is easy to visualize the atoms and the two pairs of electrons they share.
Each atom ball would be connected to another one by two bonds stick on each side of it.
What is bonding model for semiconductor?
The bonding model is mostly used to have a basic idea of what the individual electrons are doing in semiconductor. Structure of crystalline material is uniform.
Detailed solution is in attached file
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suppose an unknown compound xy has an x-to-y mass ratio of 4.0. if decomposition of compound xy gives 20.0 grams of x, then how many grams of y must form?
An unknown compound is xy has the x-to-y mass of ratio of 4.0. the decomposition of the compound xy will gives 20.0 grams of x, and then will give grams of y form is 5 g.
given that :
x/y = 4
The decomposition of the compound of xy will produces of x is = 20 g
mass of x = 20 g
therefore, x / y = 4
by cross multiplying given equation we get :
x = 4y
y = x / 4
y = 20 / 4
y = 5 g
Thus, the mass of y will produces is given as follows :
y = 5 g.
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6. How many moles of hydrochloric acid, HCl, are present in 0.085 L of a 3.0 M solution?
Answer:
[tex] \huge{ \boxed{0.255 \: \text{moles}}}[/tex]
Explanation:
To find the number of moles of a solution given it's volume and concentration/molarity, we use the formula;
[tex] \bold{c = \frac{n}{v}} \\ [/tex]
where
c is the concentration/molarity in M or mol/l.n is the number of moles.v is the volume in L or dm³.Since we're finding the number of moles, we make n the subject
[tex] \bold{n = c \times v}[/tex]
From the question;
c = 3 Mv = 0.085 L[tex]n = 3 \times 0.085 = 0.255[/tex]
We have the final answer as
0.255 molesWhich material is the limiting ingredient if you have 2 cans of tomatoes, 2 cups green beans, 2 cups pasta, 8 cans of beans, and 12 cups broth
2 cans diced tomatoes
1 cup green beans
1/2 cup pasta
1 can beans
4 cups broth
Based on the recipe for preparing the food, the limiting ingredient is the 2 cans of tomatoes.
What is the recipe for the food?The recipe for the food is given below:
2 cans diced tomatoes1 cup green beans1/2 cup pasta1 can beans4 cups brothHence, 2 cans of diced tomatoes require 1 cup of green beans, 1/2 cup of pasta, 1 can of beans, and 4 of cups broth.
Hence, after, the 2 cans of diced tomatoes are used up, no more food can be prepared.
A limiting reagent or limiting ingredient is used up when cooking, hence, the 2 cans of tomatoes are the limiting ingredient.
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if the co2 level in air rises to 0.700% (by volume), what is its partial pressure if the air pressure is 760 mmhg?
The mole fraction of carbon dioxide in the mixture is
P(CO₂) = 0.00004 × 76mmHg
= 0.304mmHg
The key to this problem is the fact that each component of a gas mixture contributes to the total pressure exerted by the mixture in proportion to the number of molecules in the mixture.
Partial pressures of gases are most often expressed as mole fractions.
P(gas) = χ(gas) × P(mixture)
This is the proportional to the number of molecules.
As you know, 1 mole of a substance is exactly 6.022⋅10²³
molecules of that substance. This is known as the Avogadro number Nₐ.
This means that the number of molecules, say x and Avogadro's number
No. can be used to express the number of moles of a gas.
From a mole = Number of Molecules × Nₐ
Now, the percentage composition of a gas mixture is the number of molecules each gas contributes to 100 molecules of the mixture.
In this case, the air must contain 0.04% carbon dioxide. This means that there are 0.04 CO₂ molecules in 100 air molecules.
For example, the number of moles of carbon dioxide in 100 air molecules is ⁿCO² = 0.04 molecules × Nₐ
= 0.04 Nₐ
This air sample is
n (total) = 100 molecules × Nₐ
= 100⋅Nₐ
This means that the mole fraction of carbon dioxide in the mixture is
P(CO₂) = 0.00004 × 76mmHg
= 0.304mmHg
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Combustion types of chemical reactions number ?
rapid combustion
spontaneous combustion
explosive combustion
If the half-life of a radioactive element is 18 days, what percentage of the original sample would be left after 108 days?.
1.56% of the original sample would be left after 108 days.
What are radioactive element?
The atoms that make up radioactive elements have unstable nuclei, and as a means of achieving stability, they emit atomic radiation. Radioactive atoms are converted into another chemical element through radiation emission, which can either make the element stable or radioactive enough to cause additional decay.
Due to the extra nuclear charge present inside of some atomic nuclei, these unstable elements undergo radioactive decay to generate stable nuclei. These substances are referred to as radioactive substances.
Therefore, 1.56% of the original sample would be left after 108 days.
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1. In the equation CH4 + 2O2 ---> CO2 + 2H20, what is the coefficient in 2H20? How is the coefficient used?
2. In the equation CH4 + 2O2 ---> CO2 + 2H20, how is the coefficient in 2O2 used?
(Need answered Asap Please!! )
1. The coefficient in 2H2O means that there are 2 moles of that compound for every 1 mole of CH4 and CO2. If you had 1 mole of CH4 (and enough O2), you would produce 2 moles of H2O. The coefficients describe the ratio of moles in an equation.
2. It's the same for O2. There are 2 moles of O2 for every 1 mole of CH4. When reacting O2 with CH4, you need 2 moles of O2 (which is important if you need to know how much O2 to react with CH4).
when 0.485 g of compound x is burned completely in a bomb calorimeter containing 3000 g of water, a temperature rise of 0.285°c is observed. what is δu of the reaction for the combustion of compound x? the hardware component of the calorimeter has a heat capacity of 3.81 kj/°c. the specific heat of water is 4.184 j/g·°c. the molar mass of compound x is 56.0 g/mol.
The change in internal energy for a molecule at 56 g/mol is discovered to be -539 kJ/mol.
The internal energy change of a reaction is represented by the symbol U. U = Heat of calorimeter + Heat of solution for a reaction in the bomb calorimeter.
Heat capacity = Heat Temperature
For example, 0.48 g compound U = 3.81 0.285 + 4.184 3000 0.28 g compound U = 4.67 kJ
For a molecule at 56 g/mol
U equals energy/mass/moles/one, where U = 4.67/0.48556 and U = 539 kJ/mol.
Since the reaction causes a temperature increase, the internal energy, or -539kJ/mol, is given a negative sign.
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supposethat 0.450 moles of f3203 are reacted with an excess of aluminum and 43.6 g fe are obtained what is the % yield
The percent yield of iron is, 86.5 %
Given,
Moles of iron(III)oxide = 0.450 mole
Mass of iron = Actual yield of Fe = 43.6 g
First we have to calculate the moles of iron.
The balanced chemical reaction is,
2Al+ 2 Fe₂O₃ --> 2Fe + Al₂O₃
From the balanced reaction we conclude that
As, 1 mole of Fe₂O₃ react to give 2 mole of Fe
So, 0.450 mole of Fe₂O₃ react to give 2/1 x 0.450 = 0.9 moles of Fe
Now we have to calculate the mass of Fe.
Mass of Fe = Moles of Fe x Molar mass of Fe
Mass of Fe = (0.9mole) x (56g/mole)= 50.4g
Therefore, the mass iron produces, 50.4 g
Now we have to calculate the percent yield of Fe.
% yield of Fe = (Actual yield of Fe/ Theoretical yield of Fe) x 100%
= 43.6g/50.6g x 100% = 86.5%
Therefore, the percent yield of Fe is, 86.5 %
The question whose answer is given:
If 0.450 moles of iron III oxide (Fe2O3) are allowed to react with an excess of aluminum (Al) and 43.6 grams of iron (Fe) is produced, what is the percent yield of iron?
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