The density of the gold is 2.5 * 10^2 g/cm^3.
\What is the density of the gold?We have to know that the density is one of the properties of the material that help us to be able to know the kind of material that we have. In this case, we are told that the material that we have to deal with here is gold.
Volume of the gold = 4/3πr^3
Where r = radius = 272 * 10^-12/2 = 1.36 * 10^-8 cm
Volume = 4/3 * 3.142 * (1.36 * 10^-8)^3
= 1.1 * 10^-23 cm^3
The we have that;
Density = mass/ volume
Density = 27x 10^-13 * 10^-9 g/ 1.1 * 10^23 cm^3
2.7 * 10^-21/1.1 * 10^-23 cm^3
= 2.5 * 10^2 g/cm^3
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. Predict whether the entropy would increase or decrease for the reaction 2H2(g) + O2(g) 2H2O(g). Explain your answer.
The entropy will decrease for the above given reaction.
Explain the entropy?Entropy is a measurable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty. From classical thermodynamics, where it was originally identified, through the microscopic description of nature in statistical physics, to the fundamentals of information theory, the phrase and idea are utilised in a variety of disciplines. It has several applications in physics and chemistry, biological systems and how they relate to life, cosmology, economics, sociology, weather science, and information systems, especially the exchange of information.Entropy is the measurement of the amount of thermal energy per unit of temperature in a system that cannot be used for productive labour. Entropy is a measure of a system's molecular disorder or unpredictability since work is produced by organised molecular motion.Explanation :
We examine whether the amount of gas rises or decreases to calculate the entropy change for a process involving chemicals that are in gaseous states.
In our case, the reactant side has 3 moles of gas while the right side has 2 moles of gas. This indicates that the process will result in less gas particle. Due to the fact that they are not in a condensed state of matter, gases have a high entropy, hence fewer gas particles will result in less disorder (entropy) in the system.
As a result, the reaction's entropy will decrease.
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How many electrons would need to be shared between two atoms of sulfur to make a stable molecule?
Two atoms of sulfur would need to share six electrons to form a stable molecule.
This is because sulfur atoms have six valence electrons, and in order to achieve a stable electron configuration, they must either gain or lose electrons to reach a total of eight electrons in their outermost shell (octet rule).
By sharing six electrons, both sulfur atoms would have eight electrons in their outermost shell, making the molecule stable. This results in the formation of a covalent bond between the two sulfur atoms, creating a molecule of sulfur dioxide (SO2).
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The interior of an incandescent
lightbulb is at about 610 mm Hg.
What is the pressure in a lightbulb
in atmospheres?
[?] atm
A tiny filament becomes hot when you pass an electric current across it. The bulb lights because hot things give off light.
What is the formula of a light bulb?A 40-watt bulb consumes 1/3 A at 120 V because power, P, equals iV and P/V = i. (C/s)(N-m/C), or J/s, which are units in iV, are watts.) Because V = iR states that for a given resistance, the bulb's resistance is 120/(1/3), or 360 ohms, when 120 volts are applied across it.At 120 volts, the majority of LED bulbs will draw between 0.2 and 0.6 amps.A phosphor, typically a halophosphate such as Ca5(PO4)3(F,Cl) containing ions of Sb3+ and Mn2+ that absorb the ultraviolet radiation, is applied to the walls of the bulbs. Following this, fluorescence causes the excited electrons to emit visible light.For electric light bulbs, 120 volts is the most typical voltage (120V). The majority of lighting fixtures use this voltage by default.To learn more about electric refer to:
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Answer: 0.803
Explanation: i got it right on acellus goodluck yall
Draw a speed vs. time graph for a car that starts at rest and steadily accelerates until it is moving at 40 m/s after 20 seconds. Then answer the following questions.
a. What is the car's acceleration?
b. What distance did the car travel during the 20 seconds?
The acceleration of the car is 2 m/s². The distance covered by the car with the speed of 40 m/s within 20 seconds is 800 m.
What is acceleration ?Acceleration is a physical quantity measuring the rate of change in velocity of a moving object. Like velocity, acceleration is a vector quantity having magnitude and direction.
Acceleration is the ratio of change in velocity to the change in time.
a = Δv/Δt
Given, the car is accelerating from rest to 40 m/s. Hence, it travelled with average velocity of 40m/s in 20 seconds.
Then , time taken = 20 s
40 m/s/20 s = 2 m/s²
Acceleration = Δv/t = 40 m/s/20 s = 2 m/s²
Distance travelled by the car = velocity × time
s = 40 m/s × 20 s = 800 m.
Therefore, the acceleration of the car is about 2 m/s² and distance travelled is 800 m.
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The density of a certain type of plastic is 0.65 g/em3. If a sheet of this plastic is 10.0 m long, 1.0 m wide, and 1 cm thick, what is its mass?
The mass of the plastic sheet is 650 g, according to the provided information.
Density: What does that mean?The number of things which could be humans, animals, plants, or objects in a given space is referred to as the density. Divide total number of items by the area's measurement to determine density. A country's population density is calculated by dividing its total population by its area, expressed both sq.km or miles.
Mass = Density * Volume
Step 1: Convert 10 m to cm
10 m = 1000 cm
Step 2: Multiply the width (1000 cm) by the thickness (1 cm) to get the area.
1000 cm x 1 cm = 1000 cm^2
Step 3: Multiply the area (1000 cm^2) by the density (0.65 g/cm^3) to get the mass.
1000 cm^2 x 0.65 g/cm^3
Mass = 650 g
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If two components of non-sterile compound are incompatible, it may result inthe
Incompatibility between two components of a non-sterile compound may result in the: Increase of component activity.
Define chemical compounds?A chemical compound is a substance made up of numerous similar molecules with atoms from various chemical elements joined by chemical bonds. Therefore, a molecule made up of atoms from only one element is not a compound.(KOM-pownd) a substance that has been chemically bonded together from two or more distinct elements. Water (H2O), which is a compound of the elements hydrogen and oxygen, and table salt (NaCl), which is a composite of the elements sodium and chloride, are two examples of compounds.The first component of the name is only the name of the metal element, and the second component transforms the ending of the nonmetal combination to "ide".To learn more about chemical compounds refer to:
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How many oxygen atoms are
present in one mole of
dinitrogen pentoxide?
N₂O5
Answer:
5
Explanation:
Because if you look at the subscript of O2 you will see that it is 5, also penta means 5
An object momentum is determined by the objects:
A. Weight and velocity
B. Mass and Acceleration
C. Mass and velocity
D. Weight and acceleration
Stainless steel is an alloy of iron, chromium, nickel, and manganese metals. If a 5.00g sample is 10.5% nickel, what is the mass of nickel in the sample?
The sample has a mass of.525 g of nickel. When two or more metals or metals and non-metals are combined, a substance known as an alloy is created.
How much iron, chrome, and nickel are there in a stainless steel alloy?With a 16–26% chromium concentration, a 6-22% nickel (Ni) content, and a low carbon content, stainless steel is an alloy of chromium, nickel, and iron that is nonmagnetic (if annealed- working it at low temperatures, then heated and cooled).When two or more metals or metals and non-metals are combined, a substance known as an alloy is created. Iron, nickel, chromium, and carbon are combined to create the alloy stainless steel.They are nonmagnetic, nonhardenable by heat treatment, and include 16 to 26 percent chromium and up to 35 percent nickel. The 18/8, or 304, grade, which has a chromium content of 18% and a nickel content of 8%, is the most used variety.To learn more about mass refer to:
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why do some molecules form double and triple covalent bonds
Can someone please help me with density?
Based on their given densities, predict which color layer the items below will settle in when dropped into your density column.
The level of the liquids depend of on their density. Liquid with highest density will be at the most bottom.
What is density?
A measurement of density compares the mass of an object with its volume. High density refers to the amount of matter in a given volume of an object. The density of a substance indicates how dense it is in a given area. The Greek scientist Archimedes made the discovery of the density principle. The more dense a liquid is, the more it will settle.
Hence top to bottom the order would be: Popsicle stick, Aluminum, Cherry tomato, Potato, Steel paperclip and Brass.
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Deposition occurs when a gas changes to a solid. Which statement is true about deposition?
Thermal energy is released by the solid.
Thermal energy is absorbed by the gas.
Thermal energy is absorbed by the liquid.
Thermal energy is released by the gas.
Answer:
Thermal energy is released by the gas.
Explanation:
Deposition is a phase transition in which a gas changes to a solid without passing through the liquid phase. During deposition, the particles in the gas lose energy and slow down, allowing them to come together and form a solid. This process releases thermal energy, which is the energy associated with the movement of atoms and molecules.
Calculate the standard enthalpy change for the reaction
2A+B⇌2C+2D
Use the following data:
Substance ΔH∘f
( kJ/mol)
A -241
B -383
C 175
D -475
The standard enthalpy change for the reaction 2A+B⇌2C+2D is 305kJ/mol.
What do you mean by enthalpy ?
Enthalpy is a thermodynamic system's measurement of energy. The quantity of enthalpy equals a system's total heat content, which is equal to the system's internal energy plus the product of volume and pressure.
By using Hess's law, the ΔH of a reaction is equal to the sum of ΔH° of products times its coefficient subtracting the sum of ΔH° of reactants times its coefficient. Replacing, for the reaction:
ΔH = 2ΔH°C + 2ΔH°D - (2ΔH°A+ΔH°B)
ΔH = 2 × 175kJ/mol + 2 × -455kJ/mol - (2 × -241kJ/mol+ (-383kJ/mol)
=350 + (-910) - ( -482 - 383 )
ΔH = 305kJ/mol
Thus, The standard enthalpy change for the reaction 2A+B⇌2C+2D is 305kJ/mol.
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Iron-59 is used in medicine to diagnose blood circulation disorders. The half-life of Iron-59 is 44.5 days. How much of a 4.0mg sample will remain after 133.5 days?
Answer:
Explanation:
The half-life of Iron-59 is 44.5 days, which means that every 44.5 days, half of the remaining Iron-59 will decay. To calculate how much of a 4.0mg sample will remain after 133.5 days, we can use the formula:
A = A0 * (1/2)^(t/T)
Where A is the remaining amount, A0 is the initial amount (4.0mg), t is the time elapsed (133.5 days), and T is the half-life (44.5 days).
Plugging in the values, we get:
A = 4.0 * (1/2)^(133.5/44.5)
A = 4.0 * (1/2)^3
A = 4.0 * (1/8)
A = 0.5 mg
So after 133.5 days, 0.5mg of the 4.0mg sample will remain.
Fe + 2C₂H5 → Fe(C₂H5)2
This chemical equation represents the reaction between iron (Fe) and ethyl (C2H5) groups to form iron ethyl carbonyl (Fe(C2H5)2).
What is the Chemical Equation?The reaction between iron and ethyl groups represented by the equation Fe + 2C2H5 → Fe(C2H5)2 describes the formation of an iron-ethyl complex, also known as iron thiocarbonyl.
The IUPAC name for this compound is iron bis(thiocarbonyl) and it is a coordination compound with a metal-carbon bond.
In this reaction, the ethyl groups (C2H5) coordinate with the iron atom (Fe) to form a coordination complex, which is held together by the polar covalent bonds between the metal ion and the ligands.
The resulting compound is a colorless solid, and its molecular formula is Fe(C2H5)2.
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Chemist I found that 24.31 g magnesium combined with 71.33 g chlorine. Chemist II found that
109.4 mg magnesium combined with 319.1 mg chlorine. You found that 3.647 g magnesium
combined with 10.700 g chlorine? How do your results compare to the two chemists? Show your
work
A. You disagree with both chemists.
B. You agree with Chemist I only.
C. You agree with Chemist II only.
D. You agree with both chemists.
The compound magnesium chloride is produced when magnesium and chlorine interact. Below is a formula for the equation. Mg+Cl2→MgCl2.
To determine accuracy or systematic error, an experiment using different methodologies is conducted.
What is the purpose of comparison in an experiment?If a significant difference exists between an experimental average and the population mean (), also known as the "true value," the t-test is employed to ascertain this. With the help of standard reference materials and quality control standards, this method is used to assess the findings of experiments.
In the range of research techniques currently employed in science, comparative studies play a crucial role. They enable scientists to use a treatment-control design in circumstances where experimentation is not an option, and they can offer priceless knowledge on the relationships between variables.
To determine accuracy or systematic error, an experiment using different methodologies is conducted. To see how this experiment works with the others, review MV - The Experimental Plan.
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Which of these pairs of atoms are isotopes?
1. Atom A: 13 protons, 12 neutrons and 12 electrons. Atom B: 12 protons, 12 neutrons and 12 electrons
2. Atom A: 12 protons, 12 neutrons and 12 electrons. Atom B: 12 protons, 12 neutrons and 13 electrons
3. Atom A: 12 protons, 12 neutrons and 12 electrons. Atom B: 12 protons, 13 neutrons and 12 electrons
Answer:
number 3
Explanation:
In isotopes the number of protons and electrons is always the same since they are isotopes of the same element. If the number of protons in atom "a" is different than in atom "b" then these are 2 different elements.
Isotopes have the same number of electrons and protons but a different number if neutrons.
Living things also ________, develop and ________.
A plant has a two-step life cycle called alternation of ________
Generation one = ________
Generation two = ________
A plant has a two-step life cycle called alternation of generation, haploid stage, and diploid stage.
What are the two different stages of the plant life cycle?Plants develop two stages during their life, which are called alternation of generation, a haploid stage of a plant is called the gametophyte and a diploid stage is called the sporophyte.
In the haploid gametophyte, stage mitosis forms the gamete, male and female gamete, and this male and female gamete fused together and form the zygote, which develops into the sporophyte.
Therefore, plants have a haploid stage and a diploid stage.
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how much time does it take light to travel 1 mile
Answer: 5.3 microseconds
Explanation: It takes light 5.3 microseconds to travel a mile.
In an experiment on gases, you are studying a 1.0L sample of hydrogen gas at 20° C and 2.40 atm. You heat the gas until the root mean Square speed of the molecules of the sample has been doubled. What will be the final pressure of the gas.
The final pressure of the gas is obtained as 4.80 atm.
What is the final pressure?We know that the root mean square speed of the gas would depend on the temperature of the molecules of the gas. Here we are told that the root mean square speed of the gas molecules is doubled and it means that the temperature was also doubled.
We have;
P1/T1 =P2/T2
2T1 = 2P1
The final pressure would be 2(2.40)atm = 4.80 atm
Thus we ought to have the temperature at the end as 4.80 atm from the calculation that has been done.
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ZOOM
1. A mole of carbon atoms will have a total mass of?
A mole of carbon atoms will have a total mass of 12 amu.
What is chemical reaction ?
A chemical reaction is a procedure that changes one set of chemical substances into another by altering their molecular structure and chemical characteristics. Chemical bonds are frequently broken and formed, and energy is either released or absorbed. The chemical equation, which lists the reactants and products involved in the reaction along with the ratio of their quantities, can be used to predict the outcome of a chemical reaction.
A chemical reaction is a procedure that changes one set of chemical substances into another by altering their molecular structure and chemical characteristics. Chemical bonds are frequently broken and formed, and energy is either released or absorbed.
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Give Perfect answer with explaination for brainliest!!!!
A 5% solution of cane-sugar (molecular weight = 342) is isotinioc with 1% solution of substance X. The molecular weight of X is:
(A) 342
(B) 171.2
(C) 68.4
(D) 136.8
Answer: the correct answer is C
Explanation:
The correct option is C 68.4
Since it is given that the solutions are isotonic,
So π 1 = π 2
Here π1= for cane sugar solution
π2= for substance x
∴C1RT=C2RT
Where C=Concentration
⇒(wt.in gr/.M.wt./ of cane sugar) = (wt.in gr./M.wt.ofx)
So 5/342=1/M.wt. of x
So M.wt.of x=1×342/5= 68.4
I needs help now pls
2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)
This is a balanced equation for the combustion of acetylene (C2H2). How many grams of acetylene(C2H2 ) are required to produce 1.0 moles of CO2?
5.0 grams
0.20 grams
13.0 grams
10.0 grams
Two types of transport ___________________________ or ____________________________
Which one does not require energy?_________________________________
In the one that does not require energy, the move across a _______________________________________________________.
They move from _____________ concentration to _____________________ concentration.
The goal is to have the molecules _______________________ over time on both sides of the concentration gradient.
Explore (pg. 7)
Which type of transport involves energy?_______________________________
It needs to use energy because_____________________________________________________________________
They get that energy from a molecule called _________________________________________
Two types of transport active and passive transport.
Passive transport does not require energy
In the one that does not require energy, they move across a concentration gradient.
They move from high concentration to low concentration.
The goal is to have the molecules equal over time on both sides of the concentration gradient.
Active transport involves energy.
It needs to use energy because it moves molecules against their concentration gradient.
They get that energy from a molecule called ATP.
How do passive and active transport work?
With the use of energy in the form of ATP, active transport transports molecules and ions from a lower concentration to a higher concentration.
On the other hand, passive transport does not require any energy to move molecules and ions from one concentration to another.
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What is the balanced formula for hydro phosphoric acid
Hydrophosphoric acid is generally known as phosphine and the formula for hydrophosphoric acid is PH3 P H 3
What is hydrophosphoric acid?Hypophosphoric acid is a mineral acid with phosphorus in an oxidation state +4.It has a chemical formula H4P2O6.
Hypophosphorous acid is used as a decolorizing agent and for color stabilization during the manufacture of chemicals and several plastics including: nylon fibers, polyamides, polyester fiber, polyacrilonitrile, alkyd rsins, epoxies, fatty acid esters and glycerols.
Therefore, the formula of hypophosphoric acid is H4P2O6. It contains four P-OH bonds, Two P=O. bonds and one P-P bond.
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How does the energy in chemical bonds affect the energy in a chemical reaction?
Calculate Kc for each reaction. b. CH4(g) + H2O(g) ⇌ CO(g) + 3 H2(g) Kp = 7.7x10^24 (at 298 K)
The Kc of the system is 1.29 * 10^22.
What is the Kc?We know that the equilibrium constant has to do with the kind of constant that we can be able to use to the conversion of the reactants to the products in the course of the reaction.
We know that;
Kp= Kc (RT)^Δn
Kp = Equilibrium constant in terms of pressure
Kc = Equilibrium constant in terms of concentration
R = gas constant
T = temperature
Δn = change in the number of moles
Then;
Kc = Kp/ (RT)^Δn
Kc = 7.7x10^24 /(0.082 * 298)^2
Kc = 1.29 * 10^22
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Applying a limited quantity hazmat label to a package that was not prompted by the VAS system is as serious of a violation as not applying a limited quantity hazmat label that was prompted by the system true or false
It was true statement, because the requirement for this Hazmat classification is to show that the identified products require diligence, carefulness, and alertness in handling, transporting, and storing them.
What is meant by Hazmat?
Hazardous materials, or HAZMAT for short, are substances in amounts or forms that could reasonably endanger life, property, or the environment.Toxic chemicals, fuels, nuclear waste, and biological, chemical, and radiological agents are only a few examples of HAZMATs.Additionally, the EPA has divided solid waste into three categories of hazardous materials: Listed, Characteristic, and Mixed Radiological and Hazardous Wastes.One of the most crucial substances in the chemical industry is sulfuric acid.Biological, chemical, and radiological agents, as well as hazardous compounds, fuels, and nuclear waste products, are examples of AZMATs.Hazardous materials are substances or compounds that can be harmful to the environment, constitute a risk to human health, or both.To learn more about Hazmat refer to
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use the slider or the + or - signs above the periodic table to increase or decrease the temperature of the elements which are gasses at 25 degrees Celsius? select each element that is a gas at 25 degrees celsius
The elements that is a gas at 25 degrees Celsius are given below.
What do you mean by Gas?
Gas is a state of matter in which a substance exists as a collection of molecules in constant random motion, dispersed throughout a given volume. Gases differ from solids and liquids in that they have neither a definite shape nor a definite volume. Examples of gases include air, oxygen, nitrogen, carbon dioxide, and methane.
- Hydrogen
- Helium
- Oxygen
- Nitrogen
- Neon
- Fluorine
- Chlorine
- Argon
At 25 degrees Celsius, all of these elements exist as gases under standard atmospheric pressure.
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The layers are made of molecules called __________________.
They have a _________ and ____________Which part of the molecule faces out towards the cytoplasm?________________________________
The layers are made of molecules called phospholipids.
They have a hydrophilic head and a hydrophobic tail
The part of the molecule that faces out towards the cytoplasm is the hydrophilic head.
What is the cell membrane?
The cell membrane is a biological membrane that isolates and shields the interior of all cells from the external environment.
The molecules that make up the cell membrane of cells are called phospholipids.
Phospholipids are amphipathic in nature in that they have a hydrophilic head and a hydrophobic tail.
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