Answer:
Use the Rydberg Equation 1/λ = R(1/n²(final) - 1/n²(initial) where R = 109,678 cm⁻¹. Substitute initial orbital number and final orbital number and solve for wavelength (λ).
Explanation:
Example:
Assume an electron transition from n = 5 to n = 2.
1/λ = 109,678cm⁻¹(1/2² - 1/5²) = 109,678(0.25 - 0.04)cm⁻¹ = 23,032cm⁻¹
λ = 1/23,032cm⁻¹ = 4.34 x 10⁻⁵cm x 10⁻²m/cm x 10⁹nm/m = 434nm
4. The half-life of C-14 is 30 years. If a scientist had 100.0 g at the beginning, how
many grams would be left after 120 years has elapsed?
Half Lives
0
1
2
Time (years)
Amount (grams)
Show table
Answer:
6,25 gm
Explanation:
4. The half-life of C-14 is 30 years. If a scientist had 100.0 g at the beginning, how
many grams would be left after 120 years has elapsed?
10 years would be 120/30 = 4 half lives0
s0 the fraction of c-14 left would be four (1/2) multiplied together
1/2 X 1/2 X 1/2 X 1/2 = 1/16
SO 1/16 OF THE 100.0 gm would be left
100.0/16 = 6,25 gm
4. A student performs four trials of an investigation to determine the boiling point of water. How should the student handle the results?
A. The student should take the average of the minimum and maximum value of the results.
B. The student should use the value that is closest to 100ºC.
C. The student should use the maximum value of the results.
D. The student should take the average of the results from all four trials.
Answer:
i think its D
Explanation:
In order to get maximum accuracy, student should take average of results from all four trials.
What is accuracy?Accuracy in terms of chemistry can be defined as to how close a measurement is to the true value.There are three types of accuracy:
1) Point accuracy-It means accuracy is present at that point of scale only.It does not give any information about the accuracy of the instrument.
2)Percentage of true value--It is the accuracy which is determined by identifying accuracy of the instrument and comparing it with the measured true value.
3)Percentage of scale range- It is the accuracy which determines accuracy of the measurement.
Accuracy in case of instruments is neglected up to ±0.5 percent.Accuracy of measurements can be increased by taking multiple measurements and taking into account human errors.
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A mixture of two gases with a total pressure of 2.78 atm contains 0.70 atm of Gas A. What is the partial pressure of Gas B in atm
Answer:
2.08 atm
Explanation:
Here we use Dalton's Law of Partial Pressures: Pa+Pb=Ptotal. 0.70 atm + Pb = 2.78 atm. To find the missing pressure of gas b we subtract .7 from the 2.78
A 32.1 mole sample of gas has a temperature of 21 Celsius and a pressure of 2280.0 torr. What is the volume of the gas?
The volume of the gas is 27 ml
The calculation can be done as follows
The first step is to convert the pressure to atm
convert 2280 tors to atm
760 tors= 1 atm
= 2280/780
= 3 atm
The formula is
PV= nRT
The next step is to write out the parameters
Pressure= 3 atm
Temperature= 21 °C
no of moles= 32.1 mole
volume= ?
(r)constant= 8.314
3 × v= 32.1×8.314×21
3v= 81.080
V= 81.080/3
V= 27 ml
Hence the volume of the gas is 27 ml
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A chemical reaction occurs when _________.
A. Chemical Bonds are build
B. A new substance is created
C. Chemical Bonds are broken
D. All of the Above
Answer:
C. Chemical Bonds are broken
Explanation:
A chemical reaction occurs when chemical bonds are broken.
Chemical reactions occur when chemical bonds between atoms are formed or broken.
Hope this helps :)
Answer:
c: chemical bonds are broken
Explanation:
the broken bonds then create new bonds, rearranging the atoms into a new substance :)
Hey :3 please help with this. Will mark brainlist if you’re right
Answer: 4
Explanation:
What happens to iron in a bolt as the bolt rusts?
A. It undergoes a chemical change.
O B. It undergoes a physical change
O C. The mass of the atoms decrease
O D. It changes into a different element.
a
Answer:
it undergoes a chemical change
11)
is the large-scale farming that mass-produces crops and livestock.
a) Organic farming
b) Industrial farming
c) Chemical farming
Answer:
b) Industrial farming
Explanation:
The term “industrial agriculture” refers to the type of farming which raises and cultivates large numbers of livestock and plants in high-density environments. It uses modern technology to promote faster growth and reduce illness and death rates in livestock, creating food products on a mass scale.
Answer: B.
Explanation
industrial agriculture
brainliest me
PLEASE HELP
1. A closed bottle contains a mixture of Ar and O2 at 25.3°C. If the partial pressure of Ar in
the bottle is 0.447 atm and the total pressure of the bottle is 1.024 atm, what is the partial
pressure of O2 in the bottle?
Answer: 0.79 atm
Explanation:
The Ideal Gas Law is PV=nRT.
since both Ar and O2 have the same volume and temperature, the only variable causing the differnce in pressure betwwen the 2 gases is the number of moles
the total pressure = the partial pressure of Ar + the partial pressure of O2
1.024 atm = 0.447 amt + ?
so
? = 1.24 -0,447 = 1.24 - 0.45= 0.79 atmthe total pressure of the bottle is 1.024 atm, what is the partial
pressure of O2 in the bottle? is PV
Help please With this :)))
Answer: 3
Explanation:
What is epoxy?
………………..
Answer:
Epoxy is the family of basic components or cured end products of epoxy resins.
list several characteristics of ligroin
- Petroleum fraction consisting mostly of [tex]C_{7}[/tex] and [tex]C_{8}[/tex] hydrocarbons
- The fraction is also called heavy naphtha
- Boiling in the range 90‒140 °C
- Ligroin is used as a laboratory solvent
- Ligroin it also esed as a motor fuel or as a solvent for fats and oils in dry cleaning
[] All of these are different characteristics of ligroin
[] If you need more let me know
Have a nice day!
I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)
- Heather
How many moles of NH3 can be produced from 5.50 moles of nitrogen in the following reaction: N2+3H2=2NH3
Answer:
Explanation:
Let the molar balance numbers be your guide.
N2 has a one in front of it.
2 NH3 has a two in front of it.
Nitrogen has 5.50 moles given.
1 / 5.50 = 2 / x Cross multiply
1 x = 2 * 5.50
x = 11.0
So if you use 5.5 moles of nitrogen, you get 11 moles of NH3
what is the chemistry
Answer:
physical science
According to 2 sources
Chemistry is a physical science Chemistry is typically considered a physical science, as defined by the Encyclopedia Britannica, because the study of chemistry does not involve living things. Most of the chemistry involved in research and development, such as making new products and materials for customers, falls within this purview.
Explanation:
PA BRAINLIEST
HOPE IT HELPS
An unknown hydrocarbon compound was analyzed for hydrogen by elemental analysis and results show that it contains 15.88 % H. What is the empirical formula
Answer:
C4H9
Explanation:
If H = 15.88%
Then C = 100.00 – 15.88 = 84.12
Divide each % value by respective atomic mass
H = 15.88/1 = 15.88
C = 84.12/12 = 7.01
Divide through by smaller value
H = 15.88/7.01 = 2.26
C = 7.01/7.01 = 1
Remove fraction , multiply by 4
H = 9
C = 4
Empirical formula = C4H9
The hydrocarbon could be ( C4H9)2 = C8H18 = octane.
(50 POINT) use this to answer: https://phet.colorado.edu/sims/html/acid-base-solutions/latest/acid-base-solutions_en.html
Describe how you could adjust the settings of the simulation to increase the number of red (H3O+) and blue (A-) particles in the solution of equilibrium. In three to four sentences, justify your answer and explain how and why this would change the pH of the solution.
The addition of more acid or base will increase the number of H3O+ and A- particles thereby decreasing and increasing the pH of the solution respectively.
What is an acid-base titration?An acid-base titration is one in which an acid is added to a given volume of base in order to neutralize it.
When more of acid is added to a solution of a base than is required to neutralize it, the solution becomes acidic.
Similarly, when more base is use to neutralize an acid than is required, the solution becomes alkaline.
In the given simulation, (H3O+) is the acid while (A-) is the base.
By adding increasing the quantity of acid added, the number of H3O+ particles will increase. This will reduce the pH of the solution.
Also, the adding more base to the solution, the number of A- particles in the solution will increase. This will increase the pH of the solution.
Therefore, addition of more acid or base will increase the number of H3O+ and A- particles thereby decreasing and increasing the pH of the solution respectively.
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Calculate the amount of energy That an obsect Can absorb from Yellow light Whose wave length is 589 nm.
Explanation:
E = hf
c= f × lamda
f= c/ lamda
c= speed of light
f= frequency
lamda = wavelength
E = h c/ lamda
E = 6.626 × 10^-34 Js × 3 × 10^8 ms-1 / 589 × 10^-9 m
= 3.37 × 10^15 J
Suppose you are performing a titration. At the beginning of the titration, you read the titrant volume as 2.51 mL. After running the titration and reaching the endpoint, you read the titrant volume as 29.95 mL. What volume, in mL, of titrant was required for the titration
The volume of titrant required for the titration would be 27.44 mL
From the illustration, the initial titrant volume was 2.51 mL. This figure represents the initial reading on the burette.
In the same vein, the final volume of the titrant was 29.95 mL. This figure represents the final reading on the burette.
In order to get the volume of titrant used:
Volume of titrant used = final volume - initial volume
= 29.95 - 2.51
= 27.44 mL
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What do we call the repeating units of a larger molecule?
Answer:
Brainlest
Explanation:
A polymer is a molecule made up of repeating units. These units, called “monomers”, form a long molecular chain. It might have branches, or it might just be one straight line of molecules, each connected in the same way. A monomer of polyethylene
Very easy science 5th grade WILL MARK As brain list if owned by today
Answer:
A
Explanation:
According to the chart, A tv turns into heat, light, and sound energy.
Which one of the following salts has the highest molar solubility in water?
Answer:
Correct option is
C
Ag
2
CO
3
; K
sp
=6.2×10
−12
(A) For CaCO
3
,S=
Ksp
=
8.7×10
−9
=9.3×10
−5
M
(B) For CuS,S=
Ksp
=
8.5×10
−45
=9.2×10
−23
M
(C) For Ag
2
CO
3
,S=(Ksp/4)
1/3
=(6.2×10
−12
/4)
1/3
=1.15×10
−4
M
(D) For Pb(IO
3
)
2
,S=(Ksp/4)
1/3
=(2.6×10
−13
/4)
1/3
=4×10
−5
M
Hence, Ag
2
CO
3
has the greatest molar solubility in pure water.
a peanut butter and jelly sandwich contains 9.00 g of fat, 6.00 g of protein, and 25.0 g of carbohydrate. How many calories does this sandwich provide?
Answer:
205 calories.
Explanation:
According to the USDA, "Carbohydrates provide 4 calories per gram, protein provides 4 calories per gram, and fat provides 9 calories per gram." 9 grams of fat at 9 calories per equals 81 calories + 6 grams of protein at 4 calories per gram which equals 24 calories + 25 grams of carbohydrate at 4 calories per gram which is equal to 100 calories.
Total that all up and you get 81 cal + 24 cal + 100 cal=205 calories.
I don't know what kind of course this is for, but if they are incredibly picky, what we refer to as "calories" are actually kilocalories, which are equal to one thousand "real" calories each. However, I'm very confident that the correct answer is 205 calories.
The sandwich will provide 205 calories.
What is calories?A calorie is an energy unit. It's the quantity of heat needed to increase the temperature of one gramme of water by [tex]1^{0} C[/tex] at one atmosphere of pressure.
Its is given that, Fat = 9 g, protein = 6 g, carbohydrate = 25 g.
It is known that, fat contains 9 calories / gram , carbohydrate contains 4 calories / gram and protein contains 4 calories / gram.
Now, adding all terms.
Total calories = (9×9) +(6×4) +(25×4)
= 205 calories.
Therefore, the sandwich will provide a total of 205 calories.
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How much heat is required to increase the temperature of 150 g of water from
38°C -55°C?
Answer:
-55°C
Explanation:
Bwcause 38°C is gonna make it colder so thats why you should use that.
plz help someone thx
Answer:
Glycerin
Explanation:
The stronger the intermolecular forces of attraction the more energy is required to break those forces, if you need more energy to break these forces it means that these certain elements would have a higher boiling point. Which is why the answer is Glycerin, the highest boiling point of an element means that it has the strongest forces, which in this case is electrostatic forces.
Answer:
Glycerin
Explanation:
Ethanol (C₂H₆O) is combusted in air according to the following reaction: C₂H₆O(l) + O₂(g) → CO₂(g) + H₂O(l) How many moles of water would be produced by the complete combustion of 44.5 grams of ethanol in the presence of excess oxygen?
2.89 moles of water would be produced by the complete combustion of 44.5 grams of ethanol in the presence of excess oxygen.
According to this question, the following reaction between ethanol and oxygen is given:C₂H₆O(l) + O₂(g) → CO₂(g) + H₂O(l)However, this equation is not balanced. The balanced equation is as follows:C₂H₆O + 3O₂ → 2CO₂ + 3H₂OAccording to this equation, 1 mole of ethanol produces 3 moles of water. We convert 44.5g of ethanol to moles by dividing by its molar mass as follows:mole = 44.5g ÷ 46.07g/molmole = 0.966mol of ethanolIf 1 mole of ethanol produces 3 moles of water.0.966mol of ethanol will produce (0.966 × 3) = 2.89molTherefore, 2.89 moles of water would be produced by the complete combustion of 44.5 grams of ethanol in the presence of excess oxygen.Learn more at: https://brainly.com/question/21085277?referrer=searchResults
The table below provides data about a gas sample. Which of the following can be determined using the data?
Volume 2.0 L
Pressure 3.6 atm
Temperature 323 K
the chemical composition of the gas
the condensation temperature of the gas
the number of moles in the sample
the distance between gas molecules in the sample
Explanation:
Tabel di bawah ini memberikan data tentang sampel gas. Manakah dari berikut ini yang dapat ditentukan dengan menggunakan data? Volume 2,0 L Tekanan 3,6 atm Suhu 323 K komposisi kimia gas suhu kondensasi gas jumlah mol dalam sampel jarak antar molekul gas dalam sampel
Explanation:
....
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Recreational drug users often obtain the drug as a white powder with unknown purity. Some users snort the power, whereas others make a solution and take it orally or inject it. To achieve a ketamine high, users usually need to take between 0.1 mg/kg and 1 mg/kg of ketamine. However, taking 2 mg/kg can lead the user to experience a K-hole or to enter an unconscious state.
If the user dissolves exactly 1 g of ketamine in 1/4 cup of water, what is the concentration of ketamine in milligrams per milliliter (mg/mL)? 1 cup=236.5 mL
What volume, in milliliters, of the recreational ketamine in the previous question would a 59.0 kg user need to take to experience a high at 0.600 mg/kg?
How many milliliters would that same user need to take to become unconscious at 2.00 mg/kg?
A user dissolves exactly 1 g of ketamine in 1/4 cup of water.
Given 1 cup = 236.5 mL, the volume of 1/4 cup of water is:
1/4 cup × (236.5 mL/1 cup) = 59.13 mL
1 g of ketamine is dissolved in 59.13 mL of water. The concentration of ketamine, in mg/mL, is:
C = 1000 mg / 59.13 mL = 16.91 mg/mL
Part 2The volume of this solution that a 59.0 kg user (body mass) would have to consume to experience a high at 0.600 mg/Kg is:
[tex]59.0 kgBM \times \frac{0.600mgKetamine}{1kgBM} \times \frac{1mL Soluiton}{16.91mgKetamine} = 2.09 mL[/tex]
Part 3The volume of this solution that a 59.0 kg user (body mass) would have to consume to become unconscious at 2.00 mg/kg is:
[tex]59.0 kgBM \times \frac{2.00mgKetamine}{1kgBM} \times \frac{1mL Soluiton}{16.91mgKetamine} = 6.98 mL[/tex]
If a user dissolves exactly 1 g of ketamine in 1/4 cup of water, the resulting concentration is 16.91 mg/mL. A 59.0 kg user would have to consume 2.09 mL of this solution to experience a high of 0.600 mg/kg. The same user would have to consume 6.98 mL of this solution to become unconscious at 2.00 mg/kg.Learn more about concentration units here: https://brainly.com/question/14594475
Calculate the mass of 5.3 moles of chloric acid (HClO3). Explain the process or show your work by including all values used to determine the answer.
Answer:
447.64 grams
Explanation:
To find the mass when given moles, it is a pretty simple process.
I start by finding the molar mass of chloric acid, which comes out to 84.46 grams/mol. To find the MM (molar mass), you just take the mass of each element in the molecule from the periodic table and add them all together.
After this, you set up the equation by taking the moles given and multiplying it by the molar mass. This gives you the new value in grams (since we cancelled out the moles). I have attached my work below.
I hope this helps! :^)
The mass of 5.3 moles chloric acid has been 447.85 g.
The mass of 1 mole of a compound has been equivalent to the molar mass of the compound. The molar mass of a compound has been the sum of the constituent atoms in a formula unit.
The molar mass (mwt) of chloric acid has been given as:
[tex]mwt=m_H\;+\;m_C_l\;+\;(m_O\;\times\;3)[/tex]
By substituting the values for the mass of constituent atoms, the molar mass has been given as:
[tex]mwt=1\;+\;35.5\;+\;16\;\times\;3\\mwt=36.5\;+\;48\\mwt=84.5[/tex]
The molar mass of chloric acid has been 84.5 g/mol.
The mass of 1 mole of chloric acid has been 84.5 g/mol. The mass of 5.3 moles chloric acid has been:
[tex]\rm 1\;mol=84.5\;g\\5.3\;mol=5.3\;\times\;84.5\;g\\5.3\;mol=447.85\;g[/tex]
The mass of 5.3 moles chloric acid has been 447.85 g.
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True or false?
Increasing the temperature can help slow down chemical reactions by "burning away" unnecessary molecules
dentify the parts of the atom that are labeled in the diagram.
Answer:
Our current model of the atom can be broken down into three constituents parts – protons, neutron, and electrons. Each of these parts has an associated charge, with protons carrying a positive charge, electrons having a negative charge, and neutrons possessing no net charge.