The frequency : f = 4.478 x 10¹⁴ /s
Further explanationGiven
wavelength = 670 nm = 670 x 10⁻⁹ m = 6.7 x 10 ⁻⁷ m
Required
The frequency
Solution
Wavelength : from the crest to the crest of the next wave or the trough to the trough
Frequency (f): number of waves in one second
Can be formulated :
v = λ x f
f = v / λ
So the frequency is inversely proportional to the wavelength
v = 3 x 10⁸ m/s(speed of light)
Input the value :
f = 3 x 10⁸ m/s : 6.7 x 10 ⁻⁷ m
f = 4.478 x 10¹⁴ /s
Increased human population will most likely have which consequence? *
A: decrease global warning
B: increase the use of fossil fuels
C: increase animal habits
D:replenish Fish species in our Ocean
Please help with my homework
Answer:
B its most likely sorry if im wrong :D :(
Explanation:
What is the name of this compound S2I4?
Answer:
Di Sulphur tetraiodide is the chemical compound with the formula S2I4
Explanation:
why is it called the periodic table of elements (why is the word periodic in it)
Answer:
It is called "periodic" because elements are lined up in cycles or periods. From left to right elements are lined up in rows based on their atomic number (the number of protons in their nucleus). ... Each horizontal row in the table is a period. There are seven (or eight) total periods.
Explanation:
What is the percent composition of Cs in CsPO4?
Answer:
58.3%
Explanation:
The formula of the compound is given as:
CsPO₄
Now, the percentage composition of Cs in the compound is = ?
So;
To find this parameter, find the molar mass of the compound:
Molar mass of CsPO₄ = 132.9 + 31 + 4(16) = 227.9g/mol
Percentage composition of Cs= [tex]\frac{132.9}{227.9} x 100[/tex] = 58.3%
Why do you think the different heating process result in different softness or hardness of the steel? Think about what steel is made of and how the atoms move .
Explanation:
Different heating process affect the microstructure of the steel in different ways. Thus, imparting different properties to the steel. For example, annealing is done is done to impart softness to steel, hardening is done to hardened the steel( eg: carburizing, nitriding, cyaniding) whereas tempering is done to improve the ductility of the steel.
Steel mainly contains iron and carbon. This percentage of carbon and iron decides the property of the steel. It is the % of carbon which is altered in different heating process that to obtained the desire microstructure in steel.
Can somebody help me answer this?
Enter a complete ionic equation to show the reaction of aqueous Hg2(NO3)2 with aqueous sodium chloride to form solid Hg2Cl2 and aqueous sodium nitrate. Express your answer as a complete ionic equation. Identify all of the phases in your answer.
Answer: [tex]Hg_2^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+2Cl^-(aq)\rightarrow Hg_2Cl_2(s)+2Na^+(aq)+2NO_3^-(aq)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The balanced chemical equation is:
[tex]Hg_2(NO_3)_2(aq)+2NaCl(aq)\rightarrow Hg_2Cl_2(s)+2NaNO_3(aq)[/tex]
The complete ionic equation will be :
[tex]Hg_2^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+2Cl^-(aq)\rightarrow Hg_2Cl_2(s)+2Na^+(aq)+2NO_3^-(aq)[/tex]
i need help asap!! i will give brainliest
An angry science student drops his textbook out of a second story window. Why does it fall to the ground? You may
choose more than one response.
A.The net force acting on the book by gravity is down.
B The drag force of the air pulls it down.
The student let the book go, removing the force of his hand.
D There is a strong magnetic force between the book and the ground.
Answer:
I think qs. "A" the net force acting on the book by gravity is down..
The statement is "The net force acting on the book by gravity is down."
What is gravity?Gravity is defined as the force that pulls materials toward the center point of a planet or other entity.
The textbook falls to the ground because of gravitational attraction between the ground and the book.
Because of the Earth's gravitational influence, the textbook moves towards the Earth when nothing is keeping it up. We know that the book has an equivalent impact on the Earth.
With a free fall acceleration of g, the textbook accelerates toward the Earth.
Hence, the correct option is A
To know more about gravity here
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Which of the following correctly shows the relationship, in terms of number of particles, of the three substances?
A. 1 mole of water < 1 mole of helium < 1 mole of aluminum
B. 1 mole of aluminum = 1 mole of helium = 1 mole of water
C. 1 mole of aluminum < 1 mole of helium < 1 mole of water
D. 1 mole of helium < 1 mole of aluminum < 1 mole of water
The correct option which shows the relation between particles of the three substances is 1 mole of aluminum = 1 mole of helium = 1 mole of water.
What is a particle?
A particle is a small part of matter.
The term refers to particles of all sizes, ranging from subatomic particles like electrons to visible particles like dust particles floating in sunlight.
The relationship of a number of particles of the substance can be calculated by Avogadro's law
Thus, the correct option is B. 1 mole of aluminum = 1 mole of helium = 1 mole of water
Learn more about particles
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Consider the following reaction:
10 KCIO3 + 3 P4 → 3 P4010 + 10 KCI
Given 30 moles of P4 and 86 moles of KCIO3, which would act as the limiting reactant?
Answer: [tex]KClO_3[/tex] is the limiting reactant in the given reaction.
Explanation:
Limiting reagent is defined as the chemical specie which gets totally consumed in the reaction and the formation of product is dependent on this reagent.
We are given:
Moles of [tex]P_4[/tex] = 30 moles
Moles of [tex]KClO_3[/tex] = 86 moles
The given chemical equation follows:
[tex]10KCIO_3+3P_4\rightarrow 3P_4O_{10}+10KCI[/tex]
By Stoichiometry of the reaction:
If 10 moles of [tex]KClO_3[/tex] reacts with 3 moles of [tex]P_4[/tex]
Then, 86 moles of [tex]KClO_3[/tex] will react with = [tex]\frac{3}{10}\times 86=25.8moles[/tex] of [tex]P_4[/tex]
As, given amount of [tex]P_4[/tex] is more than the required amount. So, it is considered as an excess reagent.
Therefore, [tex]KClO_3[/tex] is considered as a limiting reactant because it limits the formation of product.
3. If 12.5 grams of copper are reacted with excess chlorine gas, then 25.4 grams of
copper (II) chloride are produced. Calculate the theoretical yield and the percent
yield. Cu + Cl2 → CuCl2
Answer:
Percent yield = 99.6%
Theoretical yield = 25.5 g
Explanation:
Given data:
Mass of copper = 12.5 g
Mass of copper(II) chloride produced = 25.4 g
Theoretical yield = ?
Percent yield = ?
Solution:
Chemical equation:
Cu + Cl₂ → CuCl₂
Number of moles of copper:
Number of moles = mass/molar mass
Number of moles = 12.5 g / 63.5 g/mol
Number of moles = 0.19 mol
Now we will compare the moles of copper and copper chloride.
Cu : CuCl₂
1 : 1
0.19 : 0.19
Mass of CuCl₂: Theoretical yield
Mass = number of moles × molar mass
Mass = 0.19 mol × 134.45 g/mol
Mass = 25.5 g
Percent yield:
Percent yield = (actual yield / theoretical yield )×100
Percent yield = ( 25.4 g/ 25.5 g) ×100
Percent yield = 99.6%
Estimate: Press Reset. Select Atoms, and using the slider, start with 1.000 × 1023 atoms of sulfur. (Note that pressing Start puts atoms into the atom counter, not the jars.)
Is this amount more or less than one mole?
Place the jar underneath the counter. Was the jar completely filled?
How many moles do you have?
Answer:
1) The amount is less than one mole, 2) The jar is not completely filled, 3) We have 0.166 moles of sulfur.
Explanation:
We proceed to respond each question below:
1) Is this amount more or less than one mole?
According to the Avogadro's Number, one mole of an element contains about [tex]6.022\times 10^{23}[/tex] atoms. Given that we have [tex]1.000\times 10^{23}[/tex] atoms, then we conclude that this amount is less than one mole.
2) Place the jar underneath the counter. Was the jar completely filled?
Let suppose that the jar can contain up to a mole of sulfur. Then, we conclude that jar is not completely filled.
3) How many moles do you have?
The amount of moles is determined by dividing the current amount of atoms by Avogadro's Number:
[tex]x = \frac{1.000\times 10^{23}\,atoms}{6.022\times 10^{23}\,\frac{atoms}{mole} }[/tex]
[tex]x = \frac{500}{3011}\,mole[/tex]
We have 0.166 moles of sulfur.
Radiation can travel through A. liquids B. gases C. empty space D. all of these
Answer:
Liquids
Explanation:because animals like dolphins use sound radiation under water to hear each other
Answer:
D. all of these.
Explanation:
it can travel through solids, liquids, and gasses.
How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen?
1 mol of oxygen has fewer molecules.
1 mol of oxygen has more molecules.
Each sample has the same number of molecules.
The molecules cannot be compared without knowing the mass.
Answer:
Each sample has the same number of molecules.
Explanation:
Just took the quiz on edge 2021
Taking into account the definition of Avogadro's number, each sample has the same number of molecules.
Avogadro's NumberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole.
Avogadro's number applies to any substance.
This caseAvogadro's number applies to any substance. This means that the number of molecules in 1 mol of oxygen is equal to the number of molecules in 1 mol of nitrogen.
Finally, the correct answer is the third option: each sample has the same number of molecules.
Learn more about Avogadro's Number:
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A breeder reactor is one type of nuclear reactor. In a breeder reactor, uranium-238 is transformed in a series of nuclear reactions into plutonium-239.
The plutonium-239 can undergo fission as shown in the equation below. The X represents a missing product in the equation.
Compare the amount of energy released by completely fissioned plutonium-239 to the amount of energy released by the complete combustion of the same amount of coal.
Answer:hope this help
Explanation:
Please help me it’s due tmrw
1. In this section, you read about firefighters cleaning
up a hazardous spill of a base. This is the chemical
reaction they used:
H3PO4 + 3 KOH → K3PO4 + 3 H2O
(a) What type of reaction is this?
(b) Write the general equation for this kind of
reaction. Compare the equation above with the
general equation.
(c) Name the reactants
D) Name the products
a. double replacement
b. AB + CD ⇒ AD +CB
c and d
H₃PO₄ : Phosphoric acid
KOH : Potassium hydroxide
K₃PO₄ : Tripotassium phosphate
H₂O : water
Further explanationGiven
Reaction
H₃PO₄ + 3 KOH → K₃PO₄ + 3 H₂O
Required
Type of reaction
General equation
Name of reactants and product
Solution
Type of reaction :Double replacement reaction : Cations and anions of different compounds switch places
It can also be said as a neutralization reaction because it produces water(reaction between an acid and a base)
General equation :AB + CD ⇒ AD +CB
Name of reactants and productsH₃PO₄ : Phosphoric acid
KOH : Potassium hydroxide
K₃PO₄ : Tripotassium phosphate
H₂O : water
Part C
How did Dr. Tierno find the answer to his question?
Answer:
Dr. Tierno tested the pillows for signs of microorganisms. He took samples from the pillow, then he grew the microorganisms in a petri dish.
Explanation:
This is the answer on edmentum
1. How is the atom count for each element on the reactant side of a balanced chemical equation related to the atom count for each element on the product side of the same equation?
Answer: The atom count for each element on the reactant side of a balanced chemical equation is equal to the atom count for each element on the product side of the same equation
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.
In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
Thus there are 4 atoms of hydrogen on reactant as well as product side.
Also there are 2 atoms of oxygen on reactant as well as product side.
The question at the beginning of todays reading is , In what ways do people use detectors why is it important to understand particles in order to invent detectors
Answer:
Explanation:
People use detector to know the ionization of electromagnetic radiation i.e alpha, beta and gamma radiation and the output produced.
In the past, the early detectors use photographic plates which is use to detect tracks due to nuclear reactions.
It is important to know particles before inventing detectors because detectors produces visible trajectories or tracks as a result of particles that are charged which can traverse the apparatus. It was used to detect the positron and also muons and these w are particles that are produced by cosmic rays which is as a result of their interaction in the Earth's atmosphere.
How many protons and electrons are in a
Cu 2+ ion?
64
29
A 27 protons, 29 electrons
27 protons, 31 electrons
B
29 protons, 27 electrons
D
29 protons, 31 electrons
Answer:
B 29 protons, 27 electrons
Explanation:
The given specie is copper ion:
Cu²⁺
We are to find the number of protons and electrons it contains.
The number of protons is the positively charged particles in the atom.
Electrons are the negatively charged particles in the atom.
The number of protons is the same as the atomic number
Atomic number of copper = 29
Number of protons = 29
Now;
Charge = Number of protons - Number of electrons
2 = 29 - number of electrons
-27 = - number of electrons
Number of electrons = 27
How many moles and atoms are there in 60 grams of Calcium?
Answer:
The moles present in 60 g of calcium are 1.5 moles.
Answer:
In 60 grams there are 1,5 mols
Explanation:
Identify the formula for ammonium nitrate
(NH4)3NO3
NH4(NO2)2
NH4NO2
Answer:
NH₄NO₃
Explanation:
In salt naming, the cation is named first, then you must put the name of the anion. In the same way when you are writting the formula. Also, the global charge of a salt is always 0.
Thus, we must write each ion and its charge:
Ammonium: NH₄⁺
Nitrate: NO₃⁻
As both ions have the same charge, the formula is:
NH₄NO₃The cation first and then the anion.
Does anyone know what I should put for number 2 if you KNOWW plssss
Question 1
Organisms sharing a common ancestor
Evolutionary history
A. Fossil record
B.Anatomy
C.Common ancestry
D.Evolution
Answer:
Fossil record
Explanation:
but first think about it befor you do so it could be wrong im not a computer
The temperature of the system is highest when it is a
A. gas
B. liquid
C. plasma
D. solid
Answer:
gas
Explanation:
its either gas or plasma but gas should be it bc liquid and solid are cold
If the object floats in water, is its density lower or higher?
Answer:
Its has a lower density. Think about it, a ship in the water is long because if it wasn't it would have a higher density and sink. The ship needs to diperse its weight across the water to make it less dense.
Explanation:
Your welcome! Have a great day!
To be effective, a certain drug must not drop below 15 mg in the body. A 120
mgs of that drug was administered to a patient. How much time will it take for that drug to reach the 15 mg minimum level. The drug's half-life is 30 minutes.(show how you arrived at your response)
Answer:
90 Minutes
Explanation:
Original concentration = 120 mg
Half life = 30 minutes
Minimum level = 15 mg
Basically, we are to calculate the time it would take to drop from 120 mg to 15 mg.
The half life of a substance is the time it takes for the original concentration of a substance to drop to half it's starting concentration.
First Half life:
Starting concentration = 120mg
Concentration after half life = 120 / 2 = 60 mg
Second Half life;
Starting concentration = 60 mg
Concentration after half life = 60 / 2 = 30 mg
Third Half life;
Starting concentration = 30 mg
Concentration after half life = 30 / 2 = 15 mg
We have reached the minimum 15 mg level. This means it took three half lives to get there.
Total time taken = No of Half lives * Half life duration = 3 * 30 mins = 90 Minutes
Are the activities exothermic or endothermic?
Answer:
The first 5 are exothermic reaction because heat is in product means heat is evolved or given out.
And last no reaction shows that heat is required so last reaction is endothermic reaction.
Explanation:
And heat is evolved in exothermic reaction and heat is absorbed in endo thermic reaction
CHEMISTRY QUESTIONS // 30 POINTS
WILL GIVE BRAINLIEST
1. All nonmetals (except hydrogen) have 8 valence electrons?
True or False
2. The N^-3 ion is classified as a(n) ____ and has ____.
A. anion, 8 valence electrons
B. cation, 8 valence electrons
C. anion, 15 valence electrons
D. anion, 3 valence electrons
3. If two nonmetals react to form a compound and have very different _____ they form ____ bonds. If there is a small difference, then they form ____ bonds.
A. ionization energy; covalent; nonpolar ionic
B. electronegativity; nonpolar covalent; polar covalent.
C. ionization energy, ionic, nonpolar covalent
D. electronegativity, polar covalent, nonpolar covalent.
Answer:
yesyeysesyesyesyesteys