Which of the following statements is true about atomic spectra? I. The line spectra of elements are evidence that electron energies are quantized II. Energy is emitted from atoms as they move from lower energy levels to higher energy levels III. Energy is emitted from atoms as they move from higher energy levels to lower energy levels IV. Neutral atoms in the ground state emit light spontaneously

Answers

Answer 1

The line spectra of an atom offers conclusive evidence that electron energies are quantized.

Neils Bohr showed that electrons in an atom can absorb or emit energy when they move from one energy level to another. This principle is the basis upon which the spectra of atoms is built.

The true statements about the atomic spectra is;

The line spectra of elements are evidence that electron energies are quantized Energy is emitted from atoms as they move from higher energy levels to lower energy levels

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Related Questions

As atoms get smaller,valance electrons are getting closer or farther away?

Answers

Answer:

valence electrons get closer but rest of them are remain same

They are getting closer and the force of attraction is getting weaker

Does the amount of mentos affect the height of the pop explosion

Answers

Answer:

no

Explanation:

bcuz science

Answer:

The more mentos you put in a bottle of pop does not necessarily mean a larger explosion. The max amount of mentos with the largest explosion was 4 mentos, it went 350 cm high. With 5 or 6 mentos the explosion went only 330 and 310 cm high.

Hope this helped in some way?

100 ml of nitrogen collected at 27 degree celcius cooled to -73 degree celcius at same pressure.calculate the contraction in volume.​

Answers

Explanation:

P1. V1/T1 = P2. V2/T2

Apply this

since here, P1 = P2

100 ml / 300 = V2/ 200

==> 100*200/300 = V2

===> V2 = 66.66 ml

Kelli and Jarvis are members of the stage crew for the Variety Show. Between acts, they must quickly move a Baby Grand Piano onto stage. After the curtain closes, they exert a sudden forward force of 524 N to budge the piano from rest and get it up to speed. The 158-kg piano experiences 418 N of friction. a. What is the piano's acceleration during this phase of its motion? b. If Kelli and Jarvis maintain this forward force for 1.44 seconds, then what speed will the piano have?

Answers

If Kelli and Jarvis maintain a forward force of 524 N for 1.44 seconds on a 158-kg piano, the acceleration will be 0.671 m/s² and the final velocity will be 0.966 m/s.

Kelli and Jarvis exert a force of 524 N on a 158- kg (m) piano.

The friction force, which opposes this force, is 418 N.

The net force (F) is the difference between both forces.

F = 524 N - 418 N = 106 N

We can calculate the acceleration (a) of the piano using Newton's second law of motion.

What is Newton's second law of motion?

Newton's second law of motion states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force and inversely proportional to the mass of the object.

a = F/m = 106 N/158kg = 0.671 m/s²

The piano start from rest (u = 0 m/s) and moves with an acceleration of 0.671 m/s² for 1.44 s.

We can calculate its final velocity (v) using the following kinematic equation.

v = u + a × t

v = 0 m/s + 0.671 m/s² × 1.44 s = 0.966 m/s

If Kelli and Jarvis maintain a forward force of 524 N for 1.44 seconds on a 158-kg piano, the acceleration will be 0.671 m/s² and the final velocity will be 0.966 m/s.

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grade 11 chemistry(GASES) why does does cold soda taste great but warm soda taste flat?

Answers

Why does cold soda taste great but warm soda taste flat ?

Answer

When a carbonated drink is at room temperature, it is less fizzy and taste flat. Cool it down and it will taste better because the drink is designed to be drank at a lower temperature for optimal fizz and taste.

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how much usable energy is extracted from one glucose molecule

Answers

We can extract 3×3 power 3 from glucose molecules

"uses for simple machines" whats a piano that needs to be moved up to a third floor apartment

Answers

Answer:

Pulley

Explanation:

You can't the piano up the stairs, you need to something to bring it up

HOW DO THE FOLLOWING COMPARE IN THE AMOUNT OF ALCOHOL THEY CONTAIN: 12 OZ. BEER(5% ALCOHOL), 12 OZ. WINE COOLER(5% ALCOHOL), 1 1/2 OZ. OF 80 PROOF LIQUOR, 5 OZ. OF WINE(12% ALCOHOL)?

Answers

The amount of alcohol contained in each of the listed beverages can be compared as follows; 1/2 oz of 80 proof liquor > 5 oz of wine (12% alcohol) > 12 oz of wine cooler (5%alcohol) = 12 oz of beer  (5%alcohol) .

A drink that contains alcohol must be an intoxicating beverage. The extent of intoxication of an alcoholic beverage depends on the amount of alcohol that the beverage contains. There are various types of alcoholic beverages as listed in the question.

The amount of alcohol contained in each of the listed beverages can be compared as follows; 1/2 oz of 80 proof liquor > 5 oz of wine (12% alcohol) > 12 oz of wine cooler (5%alcohol) = 12 oz of beer  (5%alcohol) .

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One group of students is investigating the properties of the bar magnet shown below.
Bar magnet

The students' observations are listed below.

When an iron nail is taken near the North Pole (N) of the bar magnet, it is pulled towards the magnet.
When an iron nail is taken near the South Pole (S) of the bar magnet, it is pulled towards the magnet.
The experiment was repeated by several students using different bar magnets. Based on the investigations, which of these theories would the students most likely propose?

Group of answer choices

magnets attract iron nails

the poles of a magnet attract all materials

iron nails are attracted towards all materials

iron nails have the same properties as magnets

Answers

magnets attract everything with metal inside of it

Answer: magnets attract everything with metal inside of it

Explanation:

plizzz helpppp
consider the photo

Answers

C. Trout
Explanation: the others are all options listed are in a group separate from the trout which is a fish. So the only one diffeeent technically is trout.

Which force holds protons and neutrons together in the nucleus of an atom?

Answers

Answer:

D

Explanation:

What is the word equation for atoms of magnesium reacting with molecules of oxygen to produce magnesium oxide? magnesium magnesium oxide Right arrow. Oxygen magnesium oxygen Right arrow. Magnesium oxide magnesium oxide oxygen Right arrow. Magnesium magnesium oxygen Right arrow. Magnesium oxygen.

Answers

The word equation for atoms of magnesium reacting with molecules of oxygen to produce magnesium oxide is:

Magnesium and oxygen right arrow Magnesium oxide

Chemical equations basically has two sides

Reactant Product

The reactants are located on the left hand side while the products are located on the right hand side. The reactants and products are separated by an arrow symbol as shown below:

Reactant —> product

With the above information in mind, we can obtain the answer to the question as follow:

Reactant = Magnesium and oxygen Product = Magnesium oxide

Reactant —> product

Magnesium + oxygen —> Magnesium oxide

Magnesium and oxygen right arrow Magnesium oxide

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Answer:

B

Explanation:

i think this is right :)

how many atp are produced in the electron transport chain

Answers

Answer:

34 ATP

Explanation:

what is the osmotic pressure of a 0.850 m solution of glucose in water at 35 °c?

Answers

The osmotic pressure of the glucose solution is 21.49 atm.

From the question given above, the following data were obtained:

Molarity (M) = 0.85 MTemperature (T) = 35 °C = 35 + 273 = 308 KVan't Hoff's factor (i) = 1 (non-electrolyte)Gas constant (R) = 0.0821 atm.L/KmolOsmotic pressure (π) =?

π = iMRT

π = 1 × 0.85 × 0.0821 × 308

π = 21.49 atm

Therefore, the osmotic pressure is 21.49 atm

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which is the correct formula for the compound dinitrogen monoxide?

Answers

Answer: Dinitrogen Monoxide ( also called nitrous oxide )

is an inorganic ( not made from living matter) compound with the chemical formula of N2O.

Explanation:

Read above

Each cart below is pushed across a room with the same amount of force. Which cart will result in the greatest change in speed?

F.A 75 kg cart being pushed with a 200 N force
G.A 125 kg box being pushed with a 200 N force
H.A 350 kg box being pushed with a 200 N force
J.A 450 kg cart being pushed with a 200 N force

Answers

The cart with the greatest change in speed is the cart with a mass of 75 Kg

Acceleration is defined as the change in velocity of an object with time. Also, acceleration is related to the force and mass according to the following equation:

Acceleration (a) = Force (F) / mass (m)

a = F / m

To answer the question, we shall determine the acceleration of each cart.

For cart of mass 75 kgMass (m) = 75 KgForce (F) = 200 NAcceleration (a) =?

a = F / m

a = 200 / 75

a = 2.67 m/s²

For cart of mass 125 kgMass (m) = 125 KgForce (F) = 200 NAcceleration (a) =?

a = F / m

a = 200 / 125

a = 1.6 m/s²

For cart of mass 350 kgMass (m) = 350 KgForce (F) = 200 NAcceleration (a) =?

a = F / m

a = 200 / 350

a = 0.57 m/s²

For cart of mass 450 kgMass (m) = 450 KgForce (F) = 200 NAcceleration (a) =?

a = F / m

a = 200 / 450

a = 0.44 m/s²

From the above illustrations, we can see that the cart with a mass of 75 K has the greatest change in speed (i.e 2.67 m/s²)

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Answer:

D

Explanation:

F. 200-75=125

G. 20-125=75

H. 350-200=150

J. 450-200=250

250 is the biggest number so it has the biggest change

Which two observations are evidence that a chemical change is happening?
A. A yellow liquid forms as a yellow solid is slowly heated.
I B. Bubbles of gas are released when a solid is combined with a
liquid.
I c. Solid crystals form as the temperature of a liquid is lowered.
D. Light and heat are given off after a spark ignites a substance,

Answers

B. Bubbles are created whether using heat or not at inception of chemical change

what is the speed of a skater who travels a distance of 210 m in a time of 10 seconds

Answers

Answer:

Speed =d/t. 200÷10=21÷1000=0.021 km/h

Explanation:

S=D/T

The amount of energy involved when an electron is acquired by a neutral gaseous atom is what?

Answers

Electron gain enthalpy of the atom - if im not wrong

Can someone please explain the steps to the correct answers?

Answers

Explanation:

1. b is correct because 10^-2 is 1/100. multiplying that by 1.862 is 0.01862

2. 6 feet 10 inches = 82 inches. multiplying 82 by 2.54 we get 208.28. there are only two sig figs so it's 210 cm, not 0.21 cm.

3. 25.2 x 39370 = 992000, which is 9.92 x 10^5.

Which tool would give the most precise measurement of 15 milliliters of water

Answers

A graduated cylinder

_________________

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What is an allotrope?
a) The same atom with a different number of neutrons
b) A radioactive substance
c) An alternative form of an element
d) Diamond

Answers

A I think but idrk I just guess sorry if you get it wrong cause of me just be careful I could be wrong

How much heat is required to warm 50.0 g of ice from -10.0oC to 0.00oC, melt the ice, warm the water from 0.00oC to 100.0oC, boil the water, and heat the steam to
120.0oC ?
a 209,000 J
b 199,000 J
c 1.67 x 106 J
d 152,000 J

Answers

The total heat required to convert the ice to steam is 155,000 J.

The given parameters:

Mass of the ice, m = 50 gInitial temperature of the ice, t = -10 ⁰CFinal temperature of the ice, T = 0⁰C, 100⁰C and 120⁰CSpecific heat capacity of water = 4.184 J/g⁰CHeat of fusion of ice, = 333.55 J/gHeat of vaporization, = 2,230 J/g

The heat required to raise the temperature to 0⁰C is calculated as;

[tex]Q = mc\Delta t\\\\Q_1 = 50 \times 4.184 \times (0 - (-10))\\\\Q_1 = 2092 \ J[/tex]

The  heat required to melt the ice is calculated as follows;

[tex]Q_2 = mL_f\\\\Q_2 = 50 \times 333.55 \\\\Q_2 = 16,677.5 \ J[/tex]

The heat raise the temperature to 100⁰C is calculated as;

[tex]Q_3 = 50 \times 4.184 \times (100 - 0)\\\\Q_3 = 20,920 \ J[/tex]

The  heat required to boil the water is calculated as follows;

[tex]Q_4 = mL_v\\\\Q_4 = 50 \times 2230\\\\4_4 = 111,500 \ J[/tex]

The heat raise the temperature to 120⁰C is calculated as;

[tex]Q_5 = 50 \times 4.184 \times (120 - 100)\\\\Q_5 = 4,184 \ J[/tex]

The total heat required is calculated as follows;

[tex]Q_t = Q_1 + Q_2 + Q_3 + Q_4 + Q _5 \\\\Q_t = 2092 + 16,677.5 + 20,920 + 111,500 + 4,184\\\\Q_t = 155,373.5 \ J\\\\Q_t \approx 155,000 \ J[/tex]

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What type of energy does a person experience when jumping on a trampoline?
A.) elastic potential
B.)all of these
C.) gravitational potential
D.)kinetic

Answers

Answer:

Knetic

Explanation:

When you jump on a trampoline, your body has kinetic energy that changes over time. As you jump up and down, your kinetic energy increases and decreases with your velocity. Your kinetic energy is greatest, just before you hit the trampoline on the way down and when you leave the trampoline surface on the way up.

What is the process that results in the formation of an ion

Answers

The answer is ionization

the wind pushes a paper cup along the sand at a beach. the cup has a mass of 0.025 kg and accelerates at a rate of 5 m/s2. how much force is the wind exerting on the cup

Answers

To find the force,

 ⇒ must know the force's formula ⇒ F = MA

M: mass of the objectA: acceleration of the object

Let's consider the information given:

cup has a mass of 0.025kg --> 'M'accelerates at a rate of 5 m/s^2 --> 'A'

Let's solve:

  [tex]F=MA=0.025kg*5m/s^2=0.125N[/tex]

Thus the force is 0.125N

Answer: 0.125N

Hope that helps!

Describe what a reversible reaction is.

Answers

A reversible reaction is a reaction in which the conversion of reactants to products and the conversion of products to reactants occur simultaneously.

[tex] \large \sf \pink{hopefully ♡♡}[/tex]

The ribosomes of plant cells are sites for the synthesis of
(a) ATP (b) nucleic acids (c) sugars (d) proteins

Answers

Answer:

Proteins

Explanation:

Their Function Formation Encoded in mRNA into polypeptide chains of amino acids that produces protein

The ribosome of plant cells are sites for the synthesis of proteins. The correct option is (d).

What are ribosomes?

Ribosomes are organelles that take part in the synthesis of proteins. The prokaryotic cell's ribosomes are smaller than the eukaryotic cell's ribosomes.

Currently, ribosomal RNA is a component of the cell's ribosome or protein-building machinery. The process of making proteins, or translation, is carried out by ribosomes.

The ribosome, which translates the genetic code generated in mRNA into an amino acid sequence, is universally responsible for protein synthesis. The two ribosomal subunits, small and big, come together to form the full ribosome, which is used to produce proteins.

Therefore, the correct option is (d) proteins.

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What are the base units the SI units are based on?
A-10
B-100
C-1,000
D-1

Answers

Answer:

A-10

Explanation:

In the SI, designations of multiples and subdivision of any unit may be arrived at by combining with the name of the unit the prefixes deka, hecto, and kilo meaning, respectively, 10, 100, and 1000, and deci, centi, and milli, meaning, respectively, one-tenth, one-hundredth, and one-thousandth.

IM NOT SURE PO

Andrea is making a solution of sweet tea, with 20 grams of sugar dissolved in 180
grams of water. Determine the mass percentage of sugar in the sweet tea.

Answers

The mass percentage of sugar in the sweet tea is 10%

From the question,

We are to determine the mass percentage of sugar in the sweet tea

[tex]Mass\ percentage\ of\ sugar\ in\ the\ sweet\ tea = \frac{Mass\ of\ sugar\ in\ the\ solution}{Mass\ of\ the\ solution} \times 100\%[/tex]

Mass of sugar in the solution = 20 g

Mass of the solution = 20g + 180g = 200g

[tex]Mass\ percentage\ of\ sugar\ in\ the\ sweet\ tea = \frac{20}{200} \times 100\%[/tex]

[tex]Mass\ percentage\ of\ sugar\ in\ the\ sweet\ tea = \frac{20}{2} \%[/tex]

∴ Mass percentage of sugar in the sweet tea = 10%

Hence, the mass percentage of sugar in the sweet tea is 10%

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