Which statement best summarizes the importance of Ernest Rutherford’s gold foil experiment?
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Ernest Rutherford discovered the half – life of an atom and the plum pudding model of an atom.
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What is the hydronium ion concentration of a solution whose pH is 12.40?
The missing components in the table to the rightare indicated with orange letters. Use the periodictable in the tools bar to fill in the correspondingvalues.ElementElectronaffinity(kJ/mol)Electro-negativityABromine324.62.96BBChlorineА00СMagnesium0СDSodium52.8
Atoms are:O A. One of the 4 elements that matter is composed of.B. Connected by bonds to form compounds.OC. The basic building blocks of matter.O D. Heterogeneous and refer to color, texture, and appearance.Reset Selection
How does litmus paper identify a base?A base turns red litmus blue.A base turns blue litmus red.A base turns orange litmus red.A base turns yellow litmus blue.
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The two factors that affect the magnitude of the force are magnitude of force and distance of line of action of force.
What is force?
Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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Answer : The partial pressure of is, 66 Kpa
Solution :
According to the Dalton's law, the total pressure of the gas is equal to the sum of the partial pressure of the mixture of gasses.
where,
= total partial pressure = 282 Kpa
= partial pressure of nitrogen = ?
= partial pressure of oxygen = 110 Kpa
= partial pressure of hydrogen = 106 Kpa
Now put all the given values is expression, we get the partial pressure of the nitrogen gas.
Therefore, the partial pressure of is, 66 Kpa
110 Kpa + 106 Kpa = 216 Kpa
Partial pressure:
total pressure - exerted by nitrogen:
282 Kpa - 216 Kpa
= 66 Kpa
hope this helps!
b. silicon
c. aluminum
d. phosphorus. Why?
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Atoms dont "lose" or "gain" protons, if they did, they'd be completely different elements. So basically, anything with 13 protons is a form of Aluminum.
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6 (1.00728 amu) + 6 (1.00866 amu) = x
6.04368 amu + 6.05196 amu = x
12.09564 amu = x
Then subtract it with 12 amu to get the defect mass
12.09564 amu - 12.00000 amu = y
0.09564 amu = y
So the defect mass would be 0.09564 amu.
1) The number of protons in an element defines its atomic number, and for carbon, it is 6. 2) Number of neutrons in a carbon-12 atom is 6. 3) The mass defect of a carbon-12 atom is 0.09564 amu.
To determine the number of protons and neutrons in a carbon-12 atom and the mass defect, we need to use the given atomic masses of a proton and a neutron.
Number of protons in a carbon-12 atom:
Carbon-12 is the most common isotope of carbon, and it contains 6 protons. The number of protons in an element defines its atomic number, and for carbon, it is 6.
Number of neutrons in a carbon-12 atom:
The mass number of an isotope will be the sum of protons as well as neutrons in its nucleus. For carbon-12, the mass number is 12 amu. Since we already know it has 6 protons, the number of neutrons can be calculated as follows:
Number of neutrons = Mass number-Number of protons
Number of neutrons = 12 amu-6 protons
Number of neutrons = 6 neutrons
Mass defect of a carbon-12 atom:
The mass defect is the difference between the actual mass of a nucleus and the sum of the masses of its individual protons and neutrons.
Mass defect = (Mass of protons + Mass of neutrons) - Actual mass of carbon-12
Mass of protons = 6 protons × 1.00728 amu/proton = 6.04368 amu
Mass of neutrons = 6 neutrons × 1.00866 amu/neutron = 6.05196 amu
Actual mass of carbon-12 = 12.00000 amu
Mass defect = (6.04368 amu + 6.05196 amu) - 12.00000 amu
Mass defect = 12.09564 amu - 12.00000 amu
Mass defect = 0.09564 amu
So, the mass defect of a carbon-12 atom is 0.09564 amu.
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Hydrocarbons contain only hydrogen and carbon.
(2) the total number of protons in the atom, only
(3) the total number of protons and the total number of neutrons in the atom
(4) the total number of protons and the total number of electrons in the atom
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Answer;
(4) the total number of protons and the total number of electrons in the atom
Explanation;
-Atomic number is the number of protons in the nucleus of an atom. An atom is made up of energy shells and the central nucleus. The energy shells contains electrons that are negatively charged while the nucleus contains protons (positively charged) and neutrons (neutral).
-In a neutral atom, the number of protons and electrons are equal, thus the atomic number would indicate the number of electron and protons in an atom. The sum of protons and neutrons on the other hand gives the mass number.