Rutherford’s gold foil experiment provided evidence for which of the following statements?a. Negative and positive charges are spread evenly throughout an atom.
b. Alpha particles have a positive charge.
c. Gold is not as dense as previously thought.
d. There is a dense, positively charged mass in the center of an atom. Reset Selection
Answers
In 1899, Ernest Rutherford, a British physicist conducted a study of the absorption of radioactivity by thin sheets of metal foil. On this experiment, he concluded that all the positive charge and the mass of the atom is concentrated in a small fraction of the total volume of the atom which is called the Nucleus.
Related Questions
25) Which of these pH numbers indicates the highest level of acidity?A) 5B) 8C) 10D) 1226) Which pH indicates a basic solution?A) 1B) 5C) 7D) 1227) Given the following solutions:Solution A: pH of 10Solution B: pH of 7Solution C: pH of 5Which list has the solutions placed in order of increasing H+ concentration?A) A, B, CB) B, A, CC) C, A, BD) C, B, A28) Which of the following pH values indicates the highest concentration of hydronium ions in a solution?A) pH = 1B) pH = 2C) pH = 3D) pH = 429) As HCl(g) is added to water, the pH of the water solutionA) decreasesB) increasesC) remains the same30) What is the pH of a 0.0001 M aqueous solution of HCl?A) 1B) 2C) 3D) 431) What is the pH of a 0.001 M HNO3 solution?A) 1B) 2C) 3D) 1132) The [H3O+] of a solution is 1 × 10–8. This solution has a pH ofA) 6, which is acidicB) 8, which is basicC) 6, which is basicD) 8, which is acidic33) The H3O+ ion concentration of a solution is 1 × 10–4 mole per liter. This solution isA) acidic and has a pH of 4B) acidic and has a pH of 10C) basic and has a pH of 4D) basic and has a pH of 1034) The pH of 0.001M HCl isA) 1B) 2C) 3D) 435) Phenolphthalein is pink in an aqueous solution having a pH ofA) 5B) 2C) 7D) 1236) What is the color of the indicator thymol blue in a solution that has a pH of 11?A) redB) blueC) pinkD) yellow37) Three samples of the same solution are tested, each with a different indicator. All three indicators, bromthymol blue, bromcresol green and thymol blue, appear blue if the pH of the solution isA) 4.7B) 6.0C) 7.8D) 9.938) Based on the results of testing colorless solutions with indicators, which solution is most acidic?A) a solution in which bromthymol blue is blueB) a solution in which bromcresol green is blueC) a solution in which phenolphthalein is pinkD) a solution in which methyl orange is red39) Which indicator would best distinguish between a solution with a pH of 3.5 and a solution with a pH of 5.5A) bromthymol blueB) bromcresol greenC) litmusD) thymol blue40) Which indicator is blue in a solution that has a pH of 5.6?A) bromcresol greenB) bromthymol blueC) methyl orangeD) thymol blue41) Which indicator, when added to a solution, changes color from yellow to blue as the pH of the solution is changed from 5.5 to 8.0?A) bromcresol greenB) bromthymol blueC) litmusD) methyl orange42) The table below shows the color of the indicators methyl orange and litmus in two samples of the same solution.Which pH value is consistent with the indicator results?A) 1B) 5C) 3D) 1043) In which 0.01 M solution is phenolphthalein pink?A) CH3OH(aq)B) Ca(OH)2(aq)C) CH3COOH(aq)D) HNO3(aq)44) Which indicator is yellow in a solution with a pH of 9.8?A) methyl orangeB) bromthymol blueC) bromcresol greenD) thymol blue45) In which solution will thymol blue indicator appear blue?A) 0.1 M CH3COOHB) 0.1 M KOHC) 0.1 M HClD) 0.1 M H2SO446) According to Reference Table M, what is the color of the indicator methyl orange in a solution that has a pH of 2?A) blueB) yellowC) orangeD) red47) Which solution when mixed with a drop of bromthymol blue will cause the indicator to change from blue to yellow?A) 0.1 M HClB) 0.1 M NH3C) 0.1 M CH3OHD) 0.1 M NaOH48) According to one acid-base theory, NH3 acts as a base when an NH3 moleculeA) accepts an ionB) donates an ionC) accepts an ionD) donates an ion49) Given the diagram representing a reaction:According to one acid-base theory, the water acts asA) a base because it accepts an H+B) a base because it donates an H+C) an acid because it accepts an H+D) an acid because it donates an H+50) Given the balanced equation representing a reaction:According to one acid-base theory, the H2O() molecules act asA) a base because they accept H+ ionsB) a base because they donate H+ ionsC) an acid because they accept H+ ionsD) an acid because they donate H+ ions
Research about the reaction of baking soda and vinegar
Is there a relationship between an elements atomic number and its first ionization energy (IE)?
Consider the solubility curve at right. Which material is a gaseous solute?
Answers
What will happen to the equilibrium as OH- ions are added?
A) H+ will combine with OH- to form water.
B) [CH3COOH] will increase.
C) The acid will dissociate to supply more H+.
D) The reaction will move to the right.
E) The reaction will move to the left.
Answers
The equilibrium as OH- ions are added;
A) H+ will combine with OH- to form water.
C) The acid will dissociate to supply more H+.
D) The reaction will move to the right.
Answer : The correct options are, (A), (C) and (D)
Explanation :
Le-Chatelier's principle : It states that if any change in the variables of the reaction, then the equilibrium will shift in that direction where the effect will be minimum.
The balanced equilibrium reaction will be,
As the concentration of are decreased, the equilibrium will shift in a direction where concentration of
is increasing and thus the dissociation of acid will increase to supply more of
ions. During this process the reaction will move to the right direction.
In the given equilibrium reaction when the are added then the
ion will combine with
ion to form water.
Hence, the correct options are, (A), (C) and (D)
Answers
The Lewis and Langmuir theory of electrovalency (and as well as Kossel's) is dealing with Ionic bonds.
Lewis: electron-pair sharing, octet rule, Lewis Symbols or StructureLangmuir: introduced term "covalent" bond, and popularized Lewis's ideas
The Lewis-Langmuir electron-pair or covalent bond is referred as the homopolar bond, where the complete transfer of electrons give rise to ionic, or electrovalent bond (1) through attraction of opposite charges.
b. transition state
c. rate limiter
d. collision group
Answers
Answer:
Another name for the activated complex is Transition State.
Explanation:
According to Collision Theory for a chemical reaction to occur the reactants must collide with proper orientation and required energy. In this way the old bonds are broken and new bonds are formed. The mid point of highest energy at which both bond formation and breakage is taking place is called activation complex, a complex in between reactant and product.
The energy of this complex is the minimum amount of energy required for a particular reactants to convert into products and is called as Activation Energy.
This activation complex is also termed as Transition State because according to Transition State Theory at transition state the existing bonds tend to increase in length and become weaken while, the new forming bonds tend to decrease in length and start becoming stronger. Hence, the activated complex is in transition between reactants and products.
Answers
Answer:
For 3: The correct answer is Option A.
For 4: The correct answer is Option C.
For 5: The correct answer is Option D.
Explanation:
- For 3:
There are 2 types of solutions on the basis of pH.
An acid is defined as the chemical substance which looses hydrogen ions in a solution.
A weak acid does not completely dissociates into its ions but a strong acid completely dissociates into its ions when dissolved in water.
A base is defined as the chemical substance which looses hydroxide ions in a solution.
A weak base does not completely dissociates into its ions but a strong base completely dissociates into its ions when dissolved in water.
Hence, the correct answer is Option A.
- For 4:
According to the Bronsted Lowry conjugate acid-base theory, an acid is defined as a substance which donates protons and a base is defined as a substance which accepts protons.
For the given chemical equation:
is considered as a bronsted-lowry base because it is accepting hydrogen ion to form hydronium ion
HCl is considered as a bronsted-lowry acid because it is donating hydrogen ion to form chloride ion.
Hence, the correct answer is Option C.
- For 5:
Neutralization reaction is defined as the chemical reaction in which an acid reacts with a base to produce a salt and water molecule.
For the given options:
Option A:
The chemical equation follows:
This is an example of neutralization reaction because ammonia is considered as a base and when it reacts with HCl, it leads to the production of salt.
Option B:
The chemical equation follows:
This is an example of neutralization reaction.
Option C:
The chemical equation follows:
This is an example of neutralization reaction.
Option D:
The chemical equation follows:
This is an example of double displacement reaction.
Hence, the correct answer is Option D.
Strong acid does not conduct electricity. Question 4} A. H30 Question 5 } B. NaOH + CH3COOH
thorns
B.
small leaves
C.
large leaves
D.
brightly colored flowers
Answers
Answer:C.
large leaves
Explanation: I took the test