Answer:
1.128*10¹⁹ [GHz].
Explanation:
1) the initial formula is
E=hν, where ν - required frequency,
2) according to the formula above
[tex]\nu=\frac{E}{h};\\ \nu=\frac{748*10^{-8}}{663*10^{-36}}=1.128*10^{28}[Hz][/tex]
What is one relationship between the section Dressing For The Lab" and the section "Making A Plan And Staying Focused
The fact that both emphasize how crucial it is to plan ahead for lab experiments is one connection between the two sections.
How do you get ready for the lab?
We are aware that we conduct experiments in a laboratory. The majority of the experiments we conduct in the lab are either designed to support or refute a hypothesis. We conduct experiments from time to time to ascertain a scientific law.
We now need to think about the sections "Dressing for the Lab" and Making a Plan and Staying Focused." Dressing for lab prepares us for any accident or mishap that might take place while performing our experiment. Making a plan and staying focused emphasizes the fact that we must be prepared with what action plan or steps we have to follow and what equipment and material are required for the experiment.
Therefore, the fact that both emphasize how crucial it is to plan ahead for lab experiments is one connection between the two sections.
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How many milliliters (mL) of 3.153 M KOH are required to make a 9.0 L solution containing 0.345 g KOH per liter?
The volume of 3.153 M KOH required to make the given solution is 948.8 mL.
What is molarity?
Molarity (M) is the amount of a substance in a certain volume of solution.
Total mass of the given solution is calculated as follows;
mass = mass conc. x volume
mass = 0.345 g/L x 9 L
mass = 3.105 g
The volume of 3.153 M KOH required to make the given solution is calculated as follows;
Molarity = mass/volume in liters
3.153 = 3.105/V
V = 3.105/3.153
V = 0.9848 L
V = 948.8 mL
Thus, the volume of 3.153 M KOH required to make the given solution is 948.8 mL.
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0.0005 L
Express your answer as an integer.
Formation of a copper(1) ion from a neutral copper atom
Please find the equation to form copper (I) ion from neutral copper (Cu) below:
The periodic table's 29th element, copper, has an electrical configuration of [tex][Ar]3d^{10} 4s^{1}[/tex]An oxidation reaction occurs when an atom loses an electron to generate a positive ion.Here, to generate a positive ion, copper must lose one electron. The following equation describes how neutral copper atoms can produce copper (I) ions: [tex]Cu[/tex] → [tex]Cu^{+} + 1e^{-}[/tex]Oxidation is also the increase in the oxidation states of an atom or ion or atoms in a molecule. A redox reaction is a type of chemical reaction in which there is a transfer of electrons from an atom or ion to another resulting in a change in oxidation states of the substances involved. The reducing agent in the reaction is undergoes oxidation by losing electrons while the oxidizing agent is reduced that is it gains electrons at the end of the reaction. The atom or ion from which electron is lost is said to be oxidized while the other atom or ion involved in the reaction is reduced.Hence, the correct equation is mentioned above.
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The 117 or so known elements are arranged in the periodic table. Look at the first three rows of the periodic table below. Why does the periodic table have the shape it has?
The periodic table has the shape it has due to the arrangement of electrons in atoms.
What is Periodic table?This is referred to as the arrangement of the chemical elements in a tabular manner and it consists of 18 groups and 7 periods and are arranged in the order of increasing atomic number which have unique chemical properties.
The periodic table has that type of shape due to it having a resemblance of the pattern of how electrons fill the sub shells which is also the same as how they are arranged in atoms which is therefore the most appropriate choice.
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Name the following cyclalkane (image attatched)
The IUPAC name of the compound is 1- ethyl-3-methyl-cyclohexane.
What is an alkane?An alkane is a compound that is composed of only carbon and hydrogen. The alkane could be an acyclic compound or a cyclic compound. A cyclic compound is one that has the carbon atoms arranged to form a given shape.
The compound now has the carbon atoms at the vertices of the shape. There could also be substituents that are attached to the cyclic compound. If we look at the image as shown, we can see that position 1 has the ethyl substituent and position 3 has the methyl substituent.
With this in mind, we could now properly name the compound as; 1- ethyl-3-methyl-cyclohexane.
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how much is the velocity of a body when it travals 600 m in 5 minutes
Answer:
7.2km/h.
Explanation:
Therefore, we get the speed of the man crossing a 600m long street in 5 minutes as 7.2km/h.
A moon rock collected by a U.S. Apollo mission is estimated to be 3.90 billion years old by uranium/lead dating. Assuming that the rock did not contain any lead when it was formed, what is the current mass of Pb206 in the rock, if it currently contains 1.300 g of U238 ? The half-life of U238 is 4.47×109 years .
The current mass of 206Pb per 1.305g of 238U in the rock is 1.037 grams
To be able to solve this question, we need to know the rate constant and the half-life of the radioactive isotope.
What is the rate constant?
From the first order of kinetics, the rate constant is the proportionality constant in relation to the half-life.
It can be expressed by using the formula:
Now, from the parameters given:
The mass of 238U = 1.300 g
Suppose we assume that the mass of 206Pb = x
Therefore, the equation for the decay constant can be computed as:
x = 2.503 - 1.300
x = 1.203
Now, the mass of the 206Pb is calculated as:
= 1.203 grams
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How many moles are there in 4.2*1023 molecules?
There are 0.697 moles in 4.2 × 10²³ molecules of a substance.
How to calculate number of moles?The number of moles in a substance can be calculated by dividing the number of molecules in that substance by Avogadro's number as follows:
no of moles = no of molecules ÷ 6.02 × 10²³
According to this question, 4.2 × 10²³ molecules of a substance is given. The number of moles in this substance can be calculated as follows:
no of moles = 4.2 × 10²³ ÷ 6.02 × 10²³
no of moles = 0.697moles
Therefore, there are 0.697 moles in 4.2 × 10²³ molecules of a substance.
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Please help me, please thank tou
Brainliest! +80pts
In this lab we first mixed some liver with hydrogen peroxide in test tube #1 and observed foaming letting it completely react. Then we poured off the remaining liquid into a second test tube #2. Next we added fresh liver to test tube #2 and no reaction (foaming) occurred because;
A)The liquid in test tube #2 was Oxygen.
B)The liquid in test tube #2 was water.
C)The liquid in test tube #2 was Hydrogen peroxide.
D)The liquid in test tube #2 was Catalase.
Answer:
the answers b
Explanation:
Answer:
D)The liquid in test tube #2 was Catalase.
Explanation:
a student prepares a sucrose solution by pipetting 10.00 ml of a 2.15 m sucrose stock solution into a 250.00ml volumetric flask and dilutes to volume with deionized water. what is the molecular concentration of the diluted solution ?
The molar concentration of the dilute solution is 0.086m.
How to calculate the dilution concentration?To calculate the dilute concentration when a stock solution is provided we use the Dilution Equation.
Equation = M₁V₁ = M₂V₂
Where M₁ is the initial molarity (given)
V₁ is the initial volume (given)
M₂ is the final molarity (which needs to be calculated)
V₂ is the total volume (given)
Therefore, M₂ = M₁ ×V₁ ÷ V₂ = 0.086m
The molecular concentration of the diluted solution is 0.086m.
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How does a lithium cation compare to a lithium atom?
The cation is larger.
The cation has the same radius.
The cation is smaller.
The cation has the same charge.
The cation is smaller.
A lithium atom is said to be oxidized when it loses an electron and becomes a positive ion. When lithium forms chemical compounds with other elements, it loses an electron from each lithium atom and becomes a Li+ cation. These are then attracted to the negatively charged anions of ionic compounds.
When an atom loses an electron, it forms a positive ion. The number of protons in a positive ion is greater than the number of electrons. Therefore, the attractive force between the electron and the nucleus increases, reducing the atomic radius. Therefore, the size of atoms is larger than that of cations. A cation is always smaller than its parent atom because its nuclear charge remains the same and it has fewer electrons.
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(C) The lithium cation is smaller than the lithium atom.
The electronic configuration of the Lithium atom is given as:
1s² 2s¹ and the electronic configuration of Lithium cation is 1s².
The Lithium Cation is smaller because,
Less Energy Levels: As shown in electrical configurations, the Li atom's valence shell is 2 while the Li cations is 1, resulting in a closer spacing between the valence electrons and nucleus and smaller size.
Less Shielding Effect: The shielding effect is the protection provided by the core electrons to the valence electron from the nucleus pull. Since there are no core electrons in a cation of lithium, the electrons are more drawn to the protons, which causes them to be tiny.
More nuclear charge: The Li atom has three protons and three electrons. As a result, the game is slightly balanced because the three protons attract the three electrons. However, as the tone electron in the Li Cation is removed, the proton side becomes stronger and exerts more force on the electrons, bringing them closer to the nucleus and reducing their size.
Hence, the cation is smaller.
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What would mix the best with water?
Answer:
salt and sugar can mix the best with water bcoz its an homogeneous mixture
thank uh
Help asap with the chem homework please
The masses and volume of the required reagent are as follows:
Mass of KCIO₃ required = 6.53 gmass of BaSO₄ precipitate formed = 1.02 gVolume of KCl required = 46.0 mLWhat is the mass in grams of KCIO₃ needed to produce 2.56 grams of O₂?The mass in grams of KCIO₃ needed to produce 2.56 grams of O₂ is determined from the mole ratio of the reaction as given in the equation of reaction below:
2 KCIO₃ (s) → 2 KCl (s) + 3 O₂ (s)
From the equation of reaction, 2 mole of KCIO₃ produces 3 moles of O₂.
Moles of O₂ in 2.56 grams = 2.56/32
Moles of O₂ in 2.56 grams = 0.08 moles
Moles of KCIO₃ required = 0.08 * 2/3
Moles of KCIO₃ required = 0.0533 moles
molar mass of KCIO₃ = 122.5 g/mol
Mass of KCIO₃ required = 0.0533 * 122.5
Mass of KCIO₃ required = 6.53 g
Mass of precipitate formed when 25.00 mL of 0.200M BaCl₂ and 35.00 ml. of 0.125 M Na₂SO₄ are mixed is determined as follows:
BaCl₂ (aq) + Na₂SO₄ → BaSO₄ (s) + 2 NaCl (aq)
Moles of BaCl₂ reacting = 25.00 mL * 1 L/1000 mL * 0.200M
Moles of BaCl₂ reacting = 0.005 moles
Moles of Na₂SO₄ reacting = 35.00 mL * 1 L/1000 mL * 0.125 M
Moles of Na₂SO₄ reacting = 0.4375 moles
Na₂SO₄ is the limiting reactant and moles of BaSO₄ precipitate formed = 0.4375 moles
molar mass of BaSO₄ = 233 g/mol
mass of BaSO₄ precipitate formed = 0.4375 moles * 233 g/mol
mass of BaSO₄ precipitate formed = 1.02 g
Volume of 0.250 M KCl (aq) that will completely react with 50.0 ml.
of 0.115M Pb(NO₃)₂ (aq) is determined as follows:
Pb²⁺ (aq) + 2Cl⁻ (aq) → PbCl (s)
Moles of Pb(NO₃)₂ = 50 ml * 1 L/1000 mL * 0.115 M
Moles of Pb(NO₃)₂ = 0.00575 moles
Moles of KCl required = 2 * 0.00575 moles
Moles of KCl required = 0.0115 moles
Volume of KCl required = 0.0115/0.250
Volume of KCl required = 0.046 L
Volume of KCl required = 46.0 mL
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As computer processor speeds increase, it is necessary for engineers to increase the number of circuit elements packed into a given area. Individual circuit elements are often connected using very small copper “wires” deposited directly onto the surface of the chip. In some current generation processors, these copper interconnects are about 65 nm wide. What mass of copper would be in a 1-mm length of such an interconnect, assuming a square cross section? The density of copper is 8.96 g/cm3.
A circuit for an electronic device is made up of separate electronic parts like diodes, resistors, transistors, capacitors, inductors, and transistors that are connected by conductive wires or traces that allow current to flow.
What mass of copper would be in a 1-mm length of such an interconnect, assuming a square cross section?
Given that wire has a square cross section, its height and breadth are equal in length.
The logic circuitry that reacts to and processes the fundamental commands that power a computer is known as a processor (CPU). Given that it interprets the majority of computer commands, the CPU is regarded as the primary and most important integrated circuits (IC) chip in a computer.
Copper interconnects are interconnects used in semiconductor technology. They serve to cut down on power usage and propagation delays in silicon integrated circuits (ICs).
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Charlotte is driving at 67.5 mi/h and receives a text message. She looks down at her phone and takes her eyes off the road for 4.89 s. How far has Charlotte traveled in feet during this time?
484.11 feet
Charlotte is driving at 67.5 mi/h
She looks down at her phone and takes her eyes off the road for 4.89 s
so from the above statements, we got
speed of car = 67.5 mi/h
time = 4.89 s
we have to tell distance
so, from the formula
distance = speed * time
let us first convert speed from mi/h to feet/s
1 mile = 5280 feet
1 hour = 3600 sec
speed = 67.5 * 5280/3600
speed = 356,400/3600
speed = 99 feet/s
distance = 99 feet/s * 4.89 s
distance = 484.11 feet
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Did the candle continue it's flame when covered with a jar for a few minutes?why?
Answer:
yes it will because the air in the jar is co2 or o2 and these gases have the capacity to burn things out
67. When potassium chlorate is subjected to high tempera- tures, it decomposes into potassium chloride and oxygen.
(a) Write a balanced equation for the decomposition.
(b) In this decomposition, the actual yield is 83.2%. If 198.5 g of oxygen are produced, how much potassium chlorate decomposed?
The balanced chemical equation for the decomposition is 2 KClO3 (s) ---> 2 KCl (s) + 3 O2 (g) and the amount of potassium chlorate decomposed is 609.12 g KClO3
On using MnO2 as a catalyst, when potassium chlorate (KClO3) is heated, it breaks down to form potassium chloride and oxygen gas.
Balanced equation of decomposition is given by-
2KClO3-->2KCl+3O2
Given data ;
Actual yield = 83.2 %
Oxygen produced = 198.5 g
Amount of oxygen
= ( 198.5 g O2 / 0.832 )
= 238.58 g O2
So, potassium chlorate decomposed
= 238.58 g O2 × (1 mol O2 / 32 g O2 ) ×( 2 mol KClO3 / 3 mol O2 ) × ( 122.55 g KClO3 / 1 mol KClO3 )
= 609.12 g KClO3
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How many grams are there in 7 moles of c4h8
Answer:
392 grams
Explanation:
Begin by finding the molar mass. You do this by adding the atomic mass of each element in the compound.
So, add 4(12)+8(1)=56 grams C4H8
Next, set up an equation.
We start with 7 moles of C4H8, and we want to convert moles to grams. We will use the molar mass for that.
So 7mol C4H8/1 x 56grams C4H8 per/1 mole C4H8= 392 grams of C4H8 per seven moles of C4H8
What is the standard free energy change for the following reaction: Glu -> G6P A G° =?
The standard free energy change for the following reaction is -16.7 KJ/mo
Glucose+ ATP ⇒ glucose 6-phosphate + ADP
this is the reaction given
Glucose +Pi ⇒ glucose 6-phosphate ΔG° = 13.8kj/mol
ATP ⇒ ADP + Pi ΔG° = -30.5 KJ/mol
The desired reaction can be obtained by adding the two reaction given in the statement.
So the standard free energy change of the desired reaction is given by adding the standard free energy change of both these reactions.
So here :
= 13.8 KJ/mol + (-30.5 KJ/mol)
= -16.7 KJ/mol
standard gibbs free energy is the energy available to do work ,ΔG- (kJ, kJ/mol)ΔG° equation , ΔGrxn = ΔG° products - ΔG° reactants (take moles into account)To know more about standard free energy visit :
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Consider the reaction
〖2SO〗_2 (g)+O_2 (g)⇌〖2SO〗_3 (g) ∆H^°=-198.2 kJ⁄mol
Comment on the changes in the concentrations of 〖SO〗_2,O_2,and 〖SO〗_3 at equilibrium if we were to:
Increase the temperature
The equilibrium will change in a backward direction, favouring backward reaction. Equilibrium will shift in forward direction or more of SO 3 will be formed.
The concentration increases. The concentration decreases. There is no change. [O2]: The concentration increases. The concentration decreases. There is no change. [SO3]: The concentration increases. The concentration decreases. There is no change. Backward reaction will be favoured if pressure decreased.
[SO3]: The concentration increases. The concentration decreases. There is no change. [O2]: The concentration increases. The concentration decreases. There is no change.
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What do Uranus’s and Neptune’s atmospheres both contain?
Answer:
Methane
Their atmospheres both contain Methane, which makes them appear blue in color. Neptune is believed to have an active and changing atmosphere. Uranus and Neptune have rings and many moons and are part of a group called the Outer planets.
Explanation:
Answer:Uranus and Neptune have similar masses and internal compositions. Their outer atmospheres are composed of hydrogen, helium and methane, while their mantles are a combination of water, ammonia and methane ices, and their cores are a mix of rock and ice.
Structure. Uranus is one of two ice giants in the outer solar system (the other is Neptune). Most (80% or more) of the planet's mass is made up of a hot dense fluid of "icy" materials – water, methane, and ammonia – above a small rocky core.
Explanation:
What are the requirements for Science to work in the universe?
The specific requirements in Science to work in the universe include several features, i.e., consistency, observation, predictability and testability.
What do the requirements in Science mean?The expression 'requirements in Science' makes reference to all issues that must be fulfilled to work in a given scientific field in particular as the case of physics in the Universe, which depends on several characteristics, especially predictability and testability.
In conclusion, the specific requirements in Science to work in the universe include several features, i.e., consistency, observation, predictability and testability.
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If you lived in a coastal area
and received a hurricane warming, would it
be safer to travel inland to avoid the storm
or stay along the coastline?
received a hurricane warning its is safer to travel inland to avoid the storm
First, leave the area if instructed to do so or if you believe it would be harmful for you to stay in your house. Depending on the hurricane and its projected path, the terrain and elevation, and the caliber of your shelter, you should move 50 to 200 miles inland. By doing this, you will be sheltered from the strongest winds and the ensuing coastal storm surge. Because hurricane courses are unpredictable and because storm surge and wind can harm coastal roads and traffic signals well before a hurricane makes landfall, it is typically not a good idea to drive along the shore, with the exception of getting to a road that leads inland. Be aware that hurricanes have a more hazardous quadrant for wind intensity, which for hurricanes in the Gulf of Mexico and the Atlantic Ocean in our northern hemisphere is the upper left, northwestern quadrant.
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Hurricane warming indicates that a hurricane could hit your region.
Additionally, if you resided along the coast where the hurricane hit, you should stay inside.Be prepared to relocate inland or to higher ground if you live near the ocean or in a low-lying location. Large waves produced by strong winds may eventually reach the shore and turn into storm surges.Prepare your emergency supply kit. Families need to be equipped to survive on their own for at least three days. Practical supplies like drinking water, food, money, and a portable radio should be included in the kits. But they should also contain things that are specific to the requirements of your own families. This can include things for babies, prescription drugs, pet food, etc.Listen to the most recent advisories and cautions to stay informed.There will be a wind calm that lasts for two to three minutes to a half hour if the hurricane's eye passes over. During this period, remain in a secure location on the main floor but not in the basement. Keep in mind that the winds will change direction once the eye has passed.Although hurricanes are not very harmful, we must be attentive and prepared with specific tools and equipment to deal with them.
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THREE PART QUESTION FOR 30 POINTS!
Name the above compound, identify each substituent as axial or equatorial, and tell whether the conformation shown is the more stable or less stable form.
1. Give the IUPAC name
2. The substituents R1 and R2 are designated in the order they appear in the IUPAC name. Name their positions as axial or equatorial.
3. Is the confirmation show the MOST or LEAST stable?
The name of the compound is 1 chloro-3- cyclohexane and it is most stable in the equatorial conformation.
What is a model?A model is a representation of a compound. The model shows us the way that the atoms in the compound are arranged. Thee bonds could be shown by the use of the following kinds of model in science;
1) The ball and stick model
2) The space filling model
Now we know that the model could both serve as a tool for representation as well as a tool of explanation. We could use the model of the molecule to understand the chemical interactions that could be possible for the molecule that is under study.
What we have here is a ball and stick model of the compound 1 chloro-3- cyclohexane
The conformation of the molecule is an indicator of how stable the compound would be. In this case, the more stable conformation of the compound would be the equatorial conformation.
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Repeated observations have consistently
shown that oppositely charged objects
attract each other.
Repeated observations have consistently shown that oppositely charged objects attract each other and can be considered Law.
The proper sequence of steps inside the medical technique is to look at a phenomenon, develop speculation, design and carry out a Law experiment to check the speculation, examine and interpret statistics, and finally proportion the effects with different scientists. Experiments are hardly ever accurate, so it's important to hold testing a hypothesis. Scientists can learn experimental strategies via repeated checking out of a hypothesis.
Repeated observations help determine whether or not the speculation is constantly genuine in different instances. a systematic idea is a properly substantiated explanation of some factor of the herbal world, primarily based on a body of statistics that have been repeatedly confirmed via statements and experiments. Such reality-supported theories are not guesses but reliable money owed by the real international. scientific theories may be changed or changed while new data disproving the modern principle turns into be had.
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Glutaronitrile, a foul-smelling substance produced by the action of bacteria on meat, contains 63.81 % C , 6.42 % H , and 29.77 % N by mass; its molar mass is 94.1 g/mol .
100 g of Glutaronitrile contains 63.81 % C, 6.42 % H, and 29.77 5 N by mass. The molar mass of carbon is 12 g/ mol, hydrogen is 1 g/ mol and the molar mass of Nitrogen is 14 g/ mol.
What is the chemical formula?The chemical formula of a compound shows the number of atoms in the formula.
The number of moles of carbon present is 63.81/ 12 = 5.31 mol
The number of moles of hydrogen present is 6.42/ 1= 6.42 mol
The number of moles of Nitrogen present is 29.77/ 14 = 2.12 mol
Hence, the molar ratio C:H :N = 5: 6: 2
The empirical formula of Glutaronitrile is C5H6N2.
Therefore, 100 g of Glutaronitrile contains 63.81 % C, 6.42 % H, and 29.77 5 N by mass. The molar mass of carbon is 12 g/ mol, hydrogen is 1 g/ mol and the molar mass of Nitrogen is 14 g/ mol.
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Determine the mass, in grams, of 0.540 moles of S (1 mol of S has a mass of 32.07 g).
Answer:
17.3178 g
Explanation:
n= m/Mr
m= n x Mr
n= 0.540
Mr of S =32.07
m = 0.540 x 32.07
m= 17.3178 g
A 85.4 lb child has a Streptococcus infection. Amoxicillin is prescribed at a dosage of 45 mg per kg of body weight per day given b.i.d.
The amount of Amoxicillin dose given to the 85.4 lb child daily is determined as 1,743.3 mg.
What is the amount of Amoxicillin dose given to the child?
The amount of Amoxicillin dose given to the child is calculated as follows;
amount of Amoxicillin dose = weight of the child x dosage prescribed
What is the weight of the child in pounds (lb)The weight of the child in pounds (lb) is calculated as follows;
1 lb = 0.453592 kg
85.4 lb = ?
= 85.4 x 0.453592 kg
= 38.74 kg
amount of Amoxicillin dose = 38.74 kg x 45 mg/kg
amount of Amoxicillin dose = 1,743.3 mg
Thus, the amount of Amoxicillin dose given to the 85.4 lb child daily is determined as 1,743.3 mg.
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The complete question is below:
A 85.4 lb child has a Streptococcus infection. Amoxicillin is prescribed at a dosage of 45 mg per kg of body weight per day given b.i.d. Calculate the daily dose of the child.