Answer:
D
hope it helps:)))!!!!!!
The concept Planck's quantum theory of radiation is used here to determine the wavelength of the light. The wavelength of the light with 4.01 x 10⁻¹⁹ J of energy is 496 nm . The correct option is B.
What is Planck's quantum theory?According to Planck's quantum theory, different atoms and molecules can emit or absorb energy in discrete amount only. The smallest amount of energy which can be emitted or absorbed in the form of electromagnetic radiation is called quantum.
The energy of the radiation absorbed or emitted is directly proportional to the frequency of the radiation. It is given by the equation:
E = hν
ν = E / h
4.01 x 10⁻¹⁹ J / 6.626 x 10⁻³⁴ = 6.05 × 10¹⁴ Hz
We have,
ν = c / λ
λ = c / ν
3.00 x 10⁸ / 6.05 × 10¹⁴ = 4.958 × 10⁻⁷ m
1 nm = 1 × 10⁻⁹ m
4.958 × 10⁻⁷ m = 495.8 nm = 496 nm
Thus the correct option is B.
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What is the percent by mass of chlorine CI in NaCI to 3 significat digits please help
Answer:
60.7%
Explanation:
Molar mass of NaCl = 23 +35.5
= 58.5 g/mol
Molar mass of Cl = 35.5 g/mol
Percentage by mass of Cl =?
The percentage by mass of Cl in NaCl can be obtained as shown below'
Percentage by mass = mass of element / mass of the compound × 100
Percentage by mass of Cl
= 35.5 / 58.5 × 100
= 3550 / 58.5
= 60.7%
Therefore, the percentage by mass of Cl in NaCl is 60.7%
What effect does the pH of water have on radish seed germination?
Answer:
High pH negatively affected the germination rate of seeds from most species, but had no effect on the per cent germination of any of the species. The higher concentration of the nutritious solutions affected negatively the germination level and rate
Explanation:
which metals or non-metals are liquid at a room temperature of 25°C?
Answer:
gallium
Explanation:
it is the old melting in a hot cup of coffee spoon
Answer:
Elements That Are Liquid at 25°C
•Bromine
•mercury
Explanation:
The metal which exist as a liquid at room temperature is mercury.
Non-metal which exist as a liquid at room temperature is bromine.
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Which of the following molecules is an
alcohol? There is only one correct answer.
CH3COOH
CH3OH
CH2NH2
C2H5CI
CH3OH IS MOLECULES OF ALCOHOL
What type of force are you exerting when you lie on a bed?
A. Electric force
B. Magnetic force
C. Compression
D. Tension
Answer:
C. Compression
Explanation:
I'm pretty sure it's compression
How does an indicator show the difference between an acid and an alkali?
Explanation:
When a base dissolves in water it is an alkali and makes an alkaline solution.
...
Litmus.
Red Litmus Blue Litmus
Acidic solution Stays red Turns red
Neutral solution Stays red Stays blue
Alkaline solution Turns blue Stays blue
A 2.0 M solution of LiF had 4.00 moles of LiF added to a solvent to make it.
What is the volume of this solution?
A. 2 L
B. 3 L
C. 6 L
D. 8 L
Its 2L Btw
Answer:
2 L
Explanation:
From the question given above, the following data were obtained:
Molarity of LiF = 2 M
Mole of LiF = 4 moles
Volume =?
Molarity of a solution is simply defined as the mole per unit litre of the solution. Mathematically, it is expressed as:
Molarity = mole / Volume
With the above formula, we can obtain the volume of the solution as shown below:
Molarity of LiF = 2 M
Mole of LiF = 4 moles
Volume =?
Molarity = mole / Volume
2 = 4 / volume
Cross multiply
2 × volume = 4
Divide both side by 2
Volume = 4/2
Volume = 2 L
Therefore, the volume of the solution is 2 L.
When does carbon dioxide absorb the most heat energy?
during freezing
during deposition
during sublimation
during condensation
Answer:
it happenes during sublimation
Answer:
C
Explanation:
Edg
How many places after the decimal should your measurements contain?
Answer:
Minimum 2. ( Thats how I do, and till now there is no probs)
Thank You'
Hope it helps u
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Calculate the poH of a solution at 25°C which contains
1 x 10^-10 M of hydronium ions.
Answer:
4.000 hope this helps :)
what mass of water will be formed when 3g of hydrogen react with 30g of oxygen?
Answer: Write down the chemical equation first;
2H2 + O2 —-> 2H2O
2. Since the mass is given, use it to calculate the mole for each reactant;
mole = mass / molar mass
mole of H2 : 8/2 = 4 mole
mole of O2 : 30/16(2) = 0.9375 mole
Now, if you're not sure which reactant to use to calculate the mass of H2O using ratio since both answer are different, find the limiting reactant.
From the equation;
2 mol of H2 -> 2 mol of H2O
4 mol of H2 -> (4*2)/2 = 4 mol of H20
______________________________________
1 mol of O2 -> 2 mol of H2O
0.9375 mol of O2 -> (0.9375*2)/1 = 1.875 mol of H2O
Let's take a look at both numbers. Since H2 produces more water than O2, O2 will be the limiting reactant as it has the least mole of H2O. So now we are going to use O2 as our limiting reactant. Use the formula to calculate mass of water using mole.
mass of H2O : 1.875*(16+2) = 33.75 g
Thats it. Correct me if im wrong
Explanation:
Two students were discussing the Mono Lake ecosystem. The first student said, "For a 20-kilogram (kg) coyote to survive, it takes around 200 kg of Wilson's phalaropes, 400 kg of brine shrimp, and 800 kg of algae!" The second student said, "No, I think it takes even more than that." 1. Which student is correct? What is your reasoning?
Answer:
The second student is right.
Explanation:
The coyote feed on not only phalaropes but many other organisms present in the environment for its survival. There are many other organisms present in the ecosystem such as mice, squirrel, cactus fruit etc. The coyote feeds on phalaropes, the phalaropes feeds on brine shrimp and the brine shrimp feeds on algae for its survival so in this way the ecosystem moves in the forward direction. The coyote feeds on phalaropes so the energy that is present in phalaropes transferred into coyote which only 10 % while the remaining is released in the atmosphere in the form of heat energy.
What does Seltzer Water have in common with Limestone ?
make the following conversion 60.2mg = ___ g
Answer:
0.0602g
Explanation:
60.2mg is equal to 0.0602grams.
What properties can be used to identify substance and why?
Answer:
All substances can be characterized by their unique sets of physical and chemical properties. Properties that can be determined without changing the composition of a substance are referred to as physical properties. Characteristics such as melting point, boiling point, density, solubility, color, odor, etc.
A brass metal bar is made up of copper and zinc. (Between 50% to 70% is copper.) A brass metal bar weighs 20.15 ounces. 35% of the bar is zinc. How many ounces of copper are in the bar?
Answer:
The correct answer would be - 13.0975 ounces.
Explanation:
We know that brass is made up of zinc and copper. The copper part of the brass is approximately around 50 to 70% and the remaining is the zinc part.
Given:
Zinc percentage in a brass = 35%
copper percentage would be - 65% (100 - 35 = 65)
Weight of the brass metal bar = 20.15 ounce
ounces of copper are in the bar = ?
Solution:
The weight of the copper in the brass metal in ounces-
= weight of brass* percentage of copper/100
= 20.15*65/100
= 13.0975 ounces of copper.
2nd method =
The weight of the zinc in the brass metal in ounces-
= weight of brass* percentage of zinc/100
= 20.15*35/100
= 7.0525
The weight of the copper = total weight - weight of zinc
= 13.0975 ounces of copper.
PLEASE HELP ME!
-The compound dissolves in water to form a solution with pH > 7.
- The compound has a low boiling point.
The elements P, Q, R and S have proton number of 1, 7, 11 and 17.
Which of the following pair of elements will react to form a compound with the characteristics stated in the table above?
A. P and Q
B. R and S
C. Q and R
D. P and S
Answer:
C
Explanation:
Q and R forms a nitrate. When dissolved in water it will form a solution with a pH greater than 7 because the solution is alkaline.
PLEASE HELP!!!!!
Q1: Give the letter of a substance that is a solid at 20 °C
Q2: Give the letter of a substance that is a liquid at 50 °C
Answer:
A1: Z
A2: Y
Explanation:
Q1: Z is the only one with a melting point high than 20 °C.
Q2: Y is the only substance with both a melting point lower than 50 °C and a boiling point higher than 50°C
What is the pH of a solution with a concentration of 4.2 x 10−5 M H3O+? (4 points)
Select one:
a. 2.31
b. 4.38
c. 5.62
d. 6.87
What is the pH of a solution with a 4.60 x 10−4 M hydroxide ion concentration? (4 points)
Select one:
a. 0.663
b. 3.33
c. 10.1
d. 10.7
Answer:
1) b. 4.38
2) d. 10.7
Explanation:
1) The problem tells us that [H₃O⁺] = 4.2x10⁻⁵ M, and keeping in mind that [H₃O⁺]= [H⁺], we can calculate the pH of the solution:
pH = -log[H⁺] = 4.382) First we calculate the pOH of the solution:
pOH = -log[OH⁻] = -log(4.6x10⁻⁴) = 3.33Then we calculate the pH using the following formula:
pH = 14 - pOH = 14 - 3.33pH = 10.7The pH of a solution with a concentration of 4.2x10⁻⁵ M H₃O⁺ ion is 4.38 and of a solution with a concentration of 4.6x10⁻⁴ OH⁻ ion is 10.7.
What is pH and pOH?pH of any solution is define as the negative log of the concentration of H⁺ ions and pOH is define as the negative log of the concentration of OH⁻ ions.
Given that concentration of H⁺ ions in solution = 4.2x10⁻⁵ M
pH for this solution is calculated as:
pH = -log(4.2x10⁻⁵) = 4.38
Also given that concentration of OH⁻ ions in solution = 4.6x10⁻⁴
pOH = -log(4.6x10⁻⁴) = 3.33
We know that, pH + pOH = 14.
pH = 14 - 3.33 = 10.7
Hence, value of pH & pOH is 4.38 and 10.7 respectively.
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Gatorade has the conductivity of 3296 µS, Powerade has 4502 µS, and Vitamin Water is 657 µS. What does this data tell you about the dissolved ions in these solutions?
Answer:
Powerade has the most dissolved ions, followed by Gatorade and lastly vitamin water
Explanation:
How conductive a certain solution is, is based on the kind of ions that are present or dissolved in the solution. Hence, we have it that, the higher the concentration of the ions that are present in a solution, the better it will conduct.
There is thus, a direct relationship between what is dissolved or the kind of present ions and how conductive the solution is.
A solution with more dissolved ions is a better conductor of electricity and thus has a conductivity value that is higher
Thus, we can conclude that Powerade has more dissolved ions, Gatorade has less and Vitamin water has the least
What is the volume of 2 mol of chlorine gas at STP?
2.0 L
11.2 L
22.4 L
44.8 L
Answer:
44.8 L
Explanation:
Using the ideal gas law equation:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
At Standard temperature and pressure (STP);
P = 1 atm
T = 273K
Hence, when n = 2moles, the volume of the gas is:
Using PV = nRT
1 × V = 2 × 0.0821 × 273
V = 44.83
V = 44.8 L
Answer:
44.8L
Explanation:
What is microorganisms
Answer:
Technically a microorganism or microbe is an organism that is microscopic. The study of microorganisms is called microbiology. Microorganisms can be bacteria, fungi, archaea or protists. The term microorganisms does not include viruses and prions, which are generally classified as non-living.
What is the product of
Mg(NO3)2 + Na2CO3?
Answer:
MgCO3 + 2 NaNO3
Explanation:
Gas occupies 30 Liters at 2.0 atm pressure and 27° Celsius. How many moles of gas are present
Differentiate between nuclear fusion and fission .
Answer:
Explanation:
the difference is below:
Which of the following is a method that transports eroded material?
Give an example of a reaction where the following are involved:
(a) Heat
(b) Light
(c) Electricity
(d) Close contact
(e) Solution
(f) Pressure
(g) Catalyst
Explanation:
everything can be found in the picture
Find the boiling point of a solution of 2.00 m solution of sodium chloride, NaCl, in water (kb= 0.512°C, bp= 100.0°C)
Answer: Boiling point of the given solution is [tex]102.048^{o}C[/tex].
Explanation:
Given: Molality = 2.00 m
[tex]k_{b} = 0.512^{o}C[/tex]
Now, equation for dissociation of water is as follows.
[tex]H_{2}O \rightarrow H^{+} + OH^{-}[/tex]
As it is giving 2 ions upon dissociation. So, the value of i = 2.
Formula used to calculate change in temperature is as follows.
[tex]\Delta T = i \times k_{b} \times m[/tex]
where,
i = Van't Hoff factor
[tex]k_{b}[/tex] = molal boiling point elevation constant
m = molality
Substitute the values into above formula as follows.
[tex]\Delta T = i \times k_{b} \times m\\= 2 \times 0.512^{o}C \times 2.00 m\\= 2.048^{o}C[/tex]
As the boiling point of water is [tex]100^{o}C[/tex]. Hence, the boiling point of solution will be as follows.
[tex]\Delta T^{'}_{b} = 100^{o}C + 2.048^{o}C\\= 102.048^{o}C[/tex]
Thus, we can conclude that boiling point of the given solution is [tex]102.048^{o}C[/tex].
6. If more reactants are used in a chemical reaction, more products will be produced. This is
because a) More reactants cause the reaction to heat up
b) More reactants take up the same volume
c) More reactants have more atoms to react to form more products
d) Too many products can slow down the reaction
Answer:
D
Explanation:
Es para hoy, ayuda por favor
Answer: it)s not letting me download it edit it a d re send it
Explanation:
