Answer:
Emission spectra may be used in studying stars in order to determine what atoms makeup the individual star produces, due to the fact that each atom’s emission spectra biunique, one can observe the spectra emitted by the star and identify the atoms that are released by the light the star produces.
The emission spectrum can tell the elements present in the source of light. Therefore, this method can be used to get information about the element present in the stars.
What is the emission spectrum?Electromagnetic radiations interact with atoms or molecules of matter, the electrons absorb energy and jump to a higher energy state of atoms by losing their stability.
They need to move from the higher energy state to the lower energy level to regain their stability. These atoms or molecules emit radiations in several regions of the electromagnetic spectrum. The spectrum of radiation emitted by electrons in the excited state is called the emission spectrum.
The emission spectrum of a chemical element is the spectrum of frequencies of electromagnetic radiation emitted when an atom transitions from a high-energy state to a lower-energy state. The emitted energy is unique for every element and is the characteristic of the element.
Learn more about the emission spectrum, here:
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Which one of the following substances should exhibit hydrogen bonding in the liquid state?
Answer:
What are the following substances?
Explanation:
Answer:
since,hydrogen bonding requires a strongly electronegative atom bonded to a hydrogen atom,only HF willexhibit hydrogen bonding,as afluorine is sufficiently partially positive hydrogen that can form bondwith a lone pair an oxygen in water .
Hope this help u
What is the independent variable and the dependent variable?
Answer: A variable that is intentionally changed during an experiment
Explanation:Hope it works
What is the volume of 139.05 g of neon gas at STP?
Ans:___L Ne
Given :
Mass of neon gas at STP.
To Find :
The volume of 139.05 g of neon gas at STP.
Solution :
Molar mass of neon, M = 20 g.
Number of moles in 139.05 g of neon :
n = 139.05/20 ≈ 7 moles
We know, volume of 1 mole of any atom/molecules in STP is 22.4 L of volume.
So, volume of 7 moles of neon is :
V = 7×22.4 L
V = 156.8 L
Therefore, volume of 139.05 g of neon gas at STP is 156.8 L.
Draw a structural formula for the ketal formed when two molecules of ethanol combine with one cyclohexanone molecule.
Answer:
Explanation:
The nucleophilic addition reaction of alcohol to a carbonyl compound in an acidic medium forms a hemiketal in the case of a ketone or a hemiacetal in the case of an aldehyde. When the carbonyl function is brought into contact with two alcohol functions, a ketal (for a ketone) or an acetal (for an aldehyde) is obtained.
From the image attached below, we will see how ketal formation occurs by the reaction of two molecules of ethanol with one cyclohexanone molecule.
Sarah is investigating the transfer of energy in the
form of heat. One process that transfers energy
between two objects is conduction. Which statement
is not true about conduction?
A. It involves a transfer of energy in the form of heat.
B. It can transfer energy through empty space.
C. It requires direct contact between the objects.
D. It results in a change of temperature in both
objects.
Answer:
B
Explanation:
In order for any conduction to take place it needs to go through a solid. Therefore it cannot travel through empty space
Answer:
b
Explanation:
Bacteria have a nucleus but no nuclear membrane *
True
False
Answer:
T
Explanation:
Bacteria are prokaryotic cells. They do not have a nuclear membrane and chloroplast is also absent. In photosynthetic bacteria, there are lamellae called thylakoids which contain enzymes and bacterial chlorophyll necessary for photosynthesis.
About how many times more massive is a neon atom than a helium atom?
Answer:
neon is about five times more massive than helium.
Explanation:
got this one right lol
Question 2 (1.5 points)
In the world of video game design and development, what does the term 'Easter
Eggs' refer to?
certain objects, patterns, or behaviors that are related to a specific group of
people
O
a hidden element, such as a valuable collectible item, or novelty item, of some
description, to be found through exploration
Question 3 (1.5 points)
AUD)
Answer
The answer is: a hidden element, such as a valuable collectible item, or novelty item
Explanation:
Which type of energy would digesting
food be?
A. Feild
B.solar
C. Thermal
D. kinetic
E. Tube
F. chemical
Answer:
F . chemical
Explanation:
Answer:
f
Explanation:
A 30.00 mL sample of vinegar is titrated with 0.4190 M NaOH(aq). If the titration requires 27.83 mL of NaOH(aq), what is the concentration of acetic acid in the vinegar?
Answer:
0.389 M
Explanation:
Using the formula; CaVa = CbVb
Where;
Ca = concentration of acid
Cb = concentration of base
Va = volume of acid
Vb = volume of base
Based on the provided information in the question, Va = 30mL, Ca=?, Vb = 27.83mL, Cb = 0.4190 M
Hence, CaVa = CbVb
Ca = CbVb/Va
Ca = 0.4190 × 27.83 ÷ 30
Ca = 11.6607 ÷ 30
Ca = 0.3886
Ca = 0.389 M
Therefore, the concentration of acetic acid in the vinegar is 0.389 M
Suppose of iron(II) iodide is dissolved in of a aqueous solution of silver nitrate. Calculate the final molarity of iodide anion in the solution. You can assume the volume of the solution doesn't change when the iron(II) iodide is dissolved in it. Be sure your answer has the correct number of significant digits.
The question is incomplete, the complete question is;
Suppose 0.981 g of iron (II) iodide is dissolved in 150. mL of a 35.0 m M aqueous solution of silver nitrate. Calculate the final molarity of iodide anion in the solution, You can assume the volume of the solution doesn't change shen th s sove m Be sure your answer has the correct number of significant digits
Answer:
0.014 M
Explanation:
We have to first obtain the number of moles of FeI2
Molar mass of FeI2= 310 g/mol
So n = 0.981/310 = 0.0031 mol
Volume of solution = 150mL or 0.15L
Concentration of AgNO3 = 35mM * 10^-3 = 0.035M
number of moles of AgNO3 = 0.035 x 0.15 = 0.00525 mol
es
Equation of the reaction;
2AgNO3 + FeI2 -------> 2AgI + Fe(NO3
)2
Amount of excess FeI2 = 0.00525 - 0.0031 = 0.00215mol
Concentration of excess iodide in solution = Concentration of excess FeI2/volume of solution = 0.00215/0.15 = 0.0143M
1.50 x 10^23 atoms Mg
HELP Which type of light is stored energy?
A. Kinetic
B. Potential
C. Thermal
D. Field
Answer:
B
Explanation:
Answer:
Potential
Explanation:
plz help it's due in 5 min
Answer:
what is the question then we can help you out
Answer:
51.84
Explanation:
234 92U undergoes alpha decay. What is the atomic number of the resulting element. Express your answer numerically as an integer.
Answer:
90
Explanation:
Let ʸₓA be the resulting element when ²³⁴₉₂U under goes alpha decay.
Thus, the equation is given below
²³⁴₉₂U —> ʸₓA + ⁴₂He
The atomic number x of the resulting element can be obtained as follow:
92 = x + 2
Collect like terms
92 – 2 = x
90 = x
Therefore,
x = 90
Thus, the atomic number of resulting element is 90.
Pentyl Ethanoate, CH3COOC5H11, which smells like bananas, is produced from the esterification reaction:
CH3COOH(aq) +C5H11OH(aq) → CH3COOC5H11(aq) + H2O(l)
A reaction uses 3.58g of CH3COOH and 4.75g of C5H11OH and has a yield of 45.00%. Determine the mass of ester that foorms.
Answer:
3.16g of the ester are produced
Explanation:
First, we need to determine the limiting reactant of the reaction converting each reactant to moles:
Moles CH3COOH (Molar mass: 60g/mol):
3.58g * (1mol / 60g) = 0.05967moles
Moles C5H11OH (Molar mass: 88.15g/mol):
4.75g * (1mol / 88.15g) = 0.05389 moles
As the reaction is 1:1, limiting reactant is C5H11OH.
Theoretical moles of the ester CH3COOC5H11 is 0.05389 moles.
As only the 45.00% is produced:
0.05389 moles * 45.00% =
0.02425 moles of CH3COOC5H11 are produced.
In mass (Molar mass CH3COOC5H11: 130.1849g/mol):
0.02425 moles * (130.1849g / mol) =
3.16g of the ester are producedWhat are the three uses that can have a negative change on the land?
Development
Mining
Land reclamation
Agriculture
Answer:
i am pretty sure it is
Development
Mining
Land reclamation
Explanation:
Answer:
its development, mining, and agriculture I just took the assignment and got it right.
Explanation:
About how far does the S wave travel through Earth in 13 minutes? 2,000 km 4,000 km 6,000 km 8,000 km
Answer:
It travel's about 4,000 km through the Earth in 13 minutes.
Answer:
4,000 km is the correct answer!!!
Write the balanced Ka and Kb reactions for HSO3- in water. Be sure to include the physical states of each species involved in the reaction.Ka:_________Kb:_________NOTE: Use the chemical equation editor tool to input the physical states. Do not subscript the physical states of the compounds.
Answer:
Ka = [H₃O⁺] [SO₃²⁻] / [HSO₃⁻]
Kb = [OH⁻] [H₂SO₃] / [HSO₃⁻]
Explanation:
An amphoteric substance as HSO₃⁻ is a substance that act as either an acid or a base. When acid:
HSO₃⁻(aq) + H₂O(l) ⇄ H₃O⁺(aq) + SO₃²⁻(aq)
And Ka, the acid dissociation constant is:
Ka = [H₃O⁺] [SO₃²⁻] / [HSO₃⁻]When base:
HSO₃⁻(aq) + H₂O(l) ⇄ OH⁻(aq) + H₂SO₃(aq)
And kb, base dissociation constant is:
Kb = [OH⁻] [H₂SO₃] / [HSO₃⁻]There are 2 pictures, please answer this question
Answer:
vinegar or stomach acid im not quite sure
Explanation:
A crystalline solid of unknown origin forms an aqueous solution that conducts an electrical current. The solid has a high melting point and shatters when struck with a hammer. The solid is likely to be ______
Answer:
This question appears incomplete
Explanation:
This question appears incomplete because of the absence of options. However, when a solid substance conducts electricity when dissolved in water (or in it's aqueous form) and has a high melting and boiling point, that substance is likely to be an electrovalent or ionic compound. This is because, ionic compounds are crystalline solids at room temperature with the properties above. Examples of ionic compounds are sodium chloride (NaCl) and potassium iodide (KI). The type of bond present in these compounds is what is referred to as the electrovalent/ionic bond.
What is the molarity of a CsOH solution if 30.0 mL of the solution requires exactly 26.4 mL of 0.25 M HBr solution to neutralize it?
Answer: 8.89M
Explanation:
Why is Nertic zone particularly rich in living things?
Answer:
It is rich in organisms because sunlight passes through its shallow water enabling photosynthesis to occur.
Explanation:
I hope that helped!!
How is coffee, Lemonade, Soda, Vinegar, Orange Juice an acid?
Chose the molecular formula that represents an organic molecule.
(A)C6H12O6
(B)NH2
(C)Cu2O
(D)H2O
True or False: A buffer solution containing equimolar amounts of the base, aniline, and the salt of its conjugate acid, aniline hydrochloride, will result in an acidic buffer solution. (aniline: Kb = 4.3x10-10)?
Answer:
It is TRUE!
Explanation:
Answer:
True is your answer
Explanation:
What is the number of
nitrogen atoms in 12.0 g of
CO(NH2)?
[Avogadro constant = 6.02
x 1023 moll; Molar mass of
CO(NH2) = 60 g mol']
Answer:
1.2 x 10²³atoms
Explanation:
Given parameters:
Mass of CO(NH₂) = 12g
Unknown:
Number of Nitrogen atoms = ?
Solution:
Given compound;
CO(NH₂);
In;
1 mole of CO(NH₂), we have 1 mole of N
let us find the number of moles of CO(NH₂);
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Number of moles = [tex]\frac{12}{60}[/tex] = 0.2moles
Since
1 mole of CO(NH₂), we have 1 mole of N
0.2 mole of CO(NH₂) will have 0.2mole of N
1 mole of a substance contains 6.02 x 10²³ atoms
0.2 mole of N will contain 0.2 x 6.02 x 10²³ atoms = 1.2 x 10²³atoms
Based on the results from this experiment, predict whether some of the following combinations of compounds would precipitate or stay in solution. Explain how you determined that a certain compound should precipitate or be soluble. a. LiOH NaCl b. BaCl2 Na3PO4 c. MgSO4 KOH
Answer:
* No precipitate: [tex]LiOH(aq)+NaCl(aq)\rightarrow LiCl(aq)+NaOH(aq)[/tex]
* Precipitate: [tex]3BaCl_2(aq) +2Na_3PO_4(aq) \rightarrow Ba_3(PO_4)_2(s)+6NaCl(aq)[/tex]
* Precipitate: [tex]MgSO_4(aq)+2KOH(aq)\rightarrow Mg(OH)_2(s)+K_2SO_4(aq)[/tex]
Explanation:
Hello!
In this case, since these all are double displacement reactions, in which the cations and anions are exchanged, we can write the resulting chemical reactions as follows:
a. LiOH and NaCl: No precipitate is formed since LiOH and NaOH are both largely soluble in water:
[tex]LiOH(aq)+NaCl(aq)\rightarrow LiCl(aq)+NaOH(aq)[/tex]
b. BaCl2 and Na3PO4: barium phosphate precipitate is formed because it has a large molar mass which makes it insoluble in water:
[tex]3BaCl_2(aq) +2Na_3PO_4(aq) \rightarrow Ba_3(PO_4)_2(s)+6NaCl(aq)[/tex]
c. MgSO4 and KOH: magnesium hydroxide "milky" precipitate is formed because it is not soluble in water:
[tex]MgSO_4(aq)+2KOH(aq)\rightarrow Mg(OH)_2(s)+K_2SO_4(aq)[/tex]
Moreover, we can relate the solubility of a substance by considering its polarity, molar mass and nature; usually, heavy substances tend to be insoluble in water as well as nonpolar compounds.
Best regards!
The combinations which will make precipiate after mixing are BaCl₂ & Na₃PO₄ and MgSO₄ & KOH.
What is precipitate?Precipitate is a solid substance, which is insoluble in water or in any given solutions and settle down at the bottom of the vessel.
Precipitate will form when substance have higher size of ions which are not attracted by the water ions because of smaller size of water ions.
Reaction between LiOH & NaCl is shown as:BaCl₂(aq) + Na₃PO₄(aq) → Ba₃(PO₄)₂(s) + 6NaCl(aq)
Reaction MgSO₄ & KOH is shown as:MgSO₄(aq) + 2KOH(aq) → Mg(OH)₂(s) + K₂SO₄
Because of the higher size of ions of Ba₃(PO₄)₂ & Mg(OH)₂ they are insoluble in water.
Hence combination of BaCl₂ & Na₃PO₄ and MgSO₄ & KOH will make precipitate.
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A wave is moving toward the shore If its frequency is 2.7 hertz, what is its wavelength? What would the correct number of significant figures be?
Answer:
λ = 1.1×10⁸ m
Explanation:
Given data:
Frequency of wave = 2.7 Hz
Wavelength of wave = ?
Solution:
Formula:
Speed of wave = frequency × wavelength
Speed of wave = 3×10⁸ m/s
now we will put the values in formula.
3×10⁸ m/s = 2.7 s⁻¹ × λ
λ = 3×10⁸ m/s /2.7 s⁻¹
λ = 1.1×10⁸ m
Which TWO statements describe the ocean floor giving brainliest plz help and explain
Answer:
A.There are many active undersea volcanoes
B.There are long underwater mountain chains