b. The mass of the Carbon-14 sample is greater than the Carbon-12 sample, but the reactivity of both samples was the same .
c. The reactivity of the Carbon-14 sample is less than the Carbon-12 sample, but the mass of both samples was the same.
d. The reactivity of the Carbon-14 sample is greater than the Carbon-12 sample, but the mass of both samples was the same.
Answer:
B.
Explanation:
Correct: b. The mass of the Carbon-14 sample is greater than the Carbon-12 sample, but the reactivity of both samples was the same .
- C-14 has two additional neutrons, so is heavier than C-12. The chemical properties will be the same, however.
Answer: Option (d) is the correct answer.
Explanation:
At high temperature, there will be more collision between the molecules as a result more energy will generate. Thus, a wave can move quickly.
In case of solids, the particles are held more closely with each other. Therefore, when temperature is high then solid particles being closer can pass on the energy more quickly as compared to gases.
Thus, we can conclude that waves move fastest in high-temperature solids.
In Physics, waves move fastest in high-temperature solids due to the close proximity of particles which facilitates faster wave transmission and the increased kinetic energy at high temperatures.
In the study of Physics, the speed of sound waves varies depending on the properties of the medium through which they are traveling. Solids have tightly packed particles which facilitate faster wave transmission. Conversely, gases have loosely packed particles which slow down wave travel. Temperature, while affecting speed at some level, doesn't have as significant an influence as the state of matter itself.
Therefore, among the options you provided: low-temperature gases, low-temperature solids, high-temperature gases, and high-temperature solids, waves move fastest in high-temperature solids.
This is due to the increased kinetic energy of the particles in a high-temperature solid as compared to a low-temperature solid; and the closer proximity of particles in a solid as compared to a gas.
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The correct answer is (4) highly mobile electrons in the valence shell
The explanation:
-A metal consists of a lattice of atoms, each with a shell of electrons. This is also known as a positive ionic lattice.
- The outer electrons are free todissociate from their parent atoms and travel through the lattice, creating a sea of electrons, his valence electrons are what freely move around making the metal a conductor.
-When an electrical potential difference is applied across the metal, the electrons drift from one end of the conductor to the other under the influence of the electric field.
Answer: The water is highly corrosive when the saturation index < - 0.5 and
> 0.5
Explanation:
If the saturation index for a pool measures the balance between the acid level and the amount of minerals in pool water. Considering its balanced water has an index value of 0.
The water is highly corrosive when the saturation index < - 0.5 and
> 0.5
The attachment below shows the calculations.
B) neutrons
C) positrons
D) protons
Answer is B) - neutrons.
Both protons and neutrons contribute to the mass of an atom. But ₈¹⁷O atom has atomic number as 8. Hence, number of protons is 8. Atomic mass of the given atom is 17.
Atomic mass = number of protons + number of neutrons
Hence, number of neutrons in the given atom is 17 - 8 = 9.
So, the number of neutrons is greater than the number of protons. Hence the greatest composition of ₈¹⁷O atom is neutrons by mass.