1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vlad1618 [11]
3 years ago
13

In 1911, Ernest Rutherford tested the atomic model existing at the time by shooting a beam of alpha particles (42He, helium nucl

ei) at a very thin sheet of gold foil. He found that while most particles went straight through the foil undeflected, a very few were deflected at great angles as they passed through the foil. Why was this discovery a reason to change the atomic model
Chemistry
1 answer:
STatiana [176]3 years ago
5 0

Answer:

At the time of Rutherford's experiment, the accepted model for the atom was the Thomson plum-pudding model of the atom, in which the atom consists of a "sphere" of positive charge distributed all over the sphere, with tiny negative particles (the electrons) inside this sphere.

In his experiment, Rutherford shot alpha particles towards a very thin sheet of gold foil. He observed the following things:

1- Most of the alpha particles went undeflected, but

2- Some of them were scattered at very large angles

3- A few of them were even reflected back to their original directions

Observations 2) and 3) were incompatible with Thomson model of the atom: in fact, if this model was true, all the alpha particle should have gone undeflected, or scattered at very small angles. Instead, due to observations 2) and 3), it was clear that:

- The positive charge of the atom was all concentred in a tiny nucleus

- Most of the mass of the atom was also concentrated in the nucleus

So, Rutherford experiment lead to a change in the atomic model of the atom, as it was clear that the plum-pudding model was no longer adequate to describe the results of Rutherford's experiment.

You might be interested in
You weigh out 0.1183 g of a complex salt to analyze for the percentage of cyanide ion in your complex salt. After dissolving the
Stels [109]

Answer:

25.35%

Explanation:

Again let me restate the the equation of the reaction;

H2O (ℓ) + 2 MnO4 - (aq) + 3 CN- (aq) → 2 MnO2 (s) + 3 CNO- (aq) + 2 OH- (aq)

Amount of potassium permanganate  reacted = 10.2/1000 * 0.08035 = 8.1957 * 10^-4 moles

If 2 moles of MnO4 - reacts with 3 moles of CN-

8.1957 * 10^-4 moles of MnO4 - reacts with 8.1957 * 10^-4 * 3/2

= 1.229 * 10^-3 moles of CN-

Mass of CN- reacted = 1.229 * 10^-3 moles of CN- * 26.02 g/mol

= 0.03 g

Hence, percentage of the cyanide = 0.03 g/0.1183 g * 100

= 25.35%

8 0
2 years ago
What do scientists call a smart guess?
Alexus [3.1K]
An educated guess is called estimation
4 0
3 years ago
Read 2 more answers
Which type of decay has the greatest mass?<br> A.<br> alpha<br> B. beta<br> gamma<br> D.<br> nuclear
coldgirl [10]

Answer:

Alpha has the greatest mass- A.

3 0
2 years ago
Read 2 more answers
In the bohr model of the hydrogen atom, how does the radius of the electron’s orbit depend on the principal quantum number?
wolverine [178]
The radius of the electron's or basically the energy level for which the electron is found orbiting the nucleus of he hydrogen atom, as the principal quantum number tells us primarily the energy level that the electron will be found, is it the 1st, 2nd, and 3rd. The other quantum numbers tells us more specifically as per the subshell of the main shell the electron is in, the spin of the electron etc.
3 0
3 years ago
What type of front in which warm air mass is cut off from the ground by cool air beneath it?
vodomira [7]

Answer:

Occluded Front

Explanation:

"Occluded Front Forms when a warm air mass gets caught between two cold air masses. The warm air mass rises as the cool air masses push and meet in the middle. The temperature drops as the warm air mass is occluded, or “cut off,” from the ground and pushed upward."

  - www.eduplace.com › science › hmxs › pdf

7 0
2 years ago
Other questions:
  • Which description is not a property of an acid?
    13·2 answers
  • What two stereoisomeric alkanes are formed in the catalytic hydrogenation of (Z)-3-methyl-2-hexene? Draw and label the alkanes.
    11·1 answer
  • Which of the following causes a solute to dissolve in a solvent?
    14·1 answer
  • Identify the number and type of atoms in the following molecules.
    12·1 answer
  • PLEASEEEE HELPPP!! Why does one Oxygen atom bond with two Hydrogen atoms to form water? Why don't they bond in a different ratio
    15·1 answer
  • I will give branliest!!!!!! PLEASE ANSWER SOOON! ANSWER ALL QUESTIONS PLEASE EXTRA POINTS TOO
    6·2 answers
  • A weak monoprotic acid is titrated with 0.100 MNaOH. It requires 50.0 mL of the NaOH solution to reach the equivalence point. Af
    5·1 answer
  • You collect a sample of gases from an indoor pool area. The sample contains air and water vapor. The total pressure is 100.18 ki
    6·2 answers
  • 9. How many protons, neutrons, and electrons does 35C1l- have?
    5·1 answer
  • In the following reaction, what element is gaining mass?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!