The safest method for diluting concentrated sulfuric acid with water is to add acid to water. This way, when spill occurs, the acid is already diluted and less harmful than adding water to acid.
Answer:
Noble gas
Explanation:
With the exception of helium, all elements in Group 18 contain 8 electrons in the outermost shell; these are the noble gases.
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Answer:
Cobalt is indeed a metal, and its atoms exhibit certain characteristics and interactions with other cobalt atoms. Here are some key features:
Atomic Structure: The cobalt atom has an atomic number of 27, meaning it has 27 protons in its nucleus. It also typically contains 27 electrons, arranged in energy levels or shells around the nucleus. The electron configuration of cobalt is [Ar] 3d^7 4s^2.
Magnetic Properties: Cobalt is known for its magnetic properties. At room temperature, it is ferromagnetic, meaning it can be permanently magnetized. This is due to the arrangement of electrons in its outermost energy levels.
Metallic Bonding: In solid cobalt, metallic bonding occurs. Metallic bonding involves the sharing of electrons between atoms within a metal lattice. In cobalt, the outermost electrons are relatively free to move throughout the metal structure, forming a "sea" of delocalized electrons. This contributes to the metal's electrical and thermal conductivity.
Alloy Formation: Cobalt readily forms alloys with other metals. Common examples include cobalt-chromium (Co-Cr) and cobalt-nickel (Co-Ni) alloys. These alloys often exhibit enhanced strength, hardness, and resistance to corrosion.
Coordination Chemistry: Cobalt is known to form coordination complexes due to its ability to act as a Lewis acid. It can form bonds with ligands, which are typically molecules or ions with lone pairs of electrons. These complexes play a crucial role in various chemical reactions, including catalysis.
Oxidation States: Cobalt can exist in different oxidation states, including +2, +3, and +4. The +2 oxidation state is the most common for cobalt and is stable in many compounds. Cobalt compounds with different oxidation states exhibit diverse chemical and physical properties.
Overall, cobalt atoms in metallic cobalt interact through metallic bonding, while cobalt in compounds can participate in coordination chemistry and exhibit different oxidation states, leading to a wide range of applications and reactivity.
Explanation:
Light absorbed by objects, enters the eyes, and is refracted by the optic nerve in the retina.
B.
Light reflects off objects, enters the eyes, and is detected by the optic nerve in the retina.
C.
Light refracts off objects, enters the eyes, and is captured as a photograph by the lenses.
D.
Light reflects off objects, enters the eyes, and is detected by light-sensitive cells in the retina.
The human eye see objects through light reflects off objects, enters the eyes, and is detected by the optic nerve in the retina. The answer is letter B. The rest of the choices do not answer the question above.
Answer: you cannot find its new volume by using these known values and Boyle's law because the temperature does not remain constant.
Explanation:
Boyle's law states that the volume of a fixed amount of gas, at a constant temperature, varies inversely with the pressure.
So, it is a condition that the temperature does not change.
For the wheater ballon case, as it travels through the atmosphere, the temperature at different altitudes will be different.
So, you might use other equation of states, such as the combined law, which does deal with changes in the three variables: volume, pressure, and temperature.
The mathematical formulation of Boyle's law is:
pV = constanjt ⇒ p₁ V₁ = p₂ V₂, at constant T.
The mathematical formulation of the combined law of gases is:
pV/T = constant ⇒ p₁ V₁ / T₁ = p₂ V₂ / T₂, for a fixed amount of gas, then it might work for the weather ballon (if you know the initial and end temperatures).
You cannot find the new volume by using initial volume of the weather balloon and air pressure ai its initial and final altitudes and Boyle’s law because the given values are not the same. Boyle’s law holds for the pressure and volume of the GAS at constant temperature. Here you are given the air pressure outside the weather balloon not the inside of the balloon. They have different gases and so it would not apply.