7. Which of the following has to happen before the eardrum begins to vibrate with the same frequency as the source of the sound waves? A. Vibrations have to be transmitted to the fibers of the auditory nerve.
B. Impulses have to be sent to the brain through the auditory nerve.
C. The brain has to interpret the direction from which the sounds are being delivered.
D. The outer ear has to collect the sound waves and lead them to the middle ear.
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Answer : Option D) The outer ear has to collect the sound waves and lead them to the middle ear.
Explanation : Hearing is dependent on a series of complex steps that change vibrations of sound waves in the air into electrical signals. At first the vibrations of sound waves gets collected by the outer ear and from there sound waves travel through a narrow passageway called the ear canal, which leads to the eardrum. The eardrum vibrates from the incoming sound waves and sends these vibrations to three tiny bones in the middle ear. The auditory nerve then carries these signals to the brain.
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Answers
Final answer:
The type of chemical bonding in sodium phosphate (Na3PO4) is ionic bonding. This is due to the transfer of electrons from sodium atoms to a phosphate group, forming ions which then attract one another to create a balanced, electrically neutral compound.
Explanation:
The chemical bonding in sodium phosphate (Na3PO4) is classified as ionic bonding. Ionic bonding involves the transfer of electrons from one atom to another, resulting in the formation of ions. This occurs between atoms of different electronegativities, typically a metal and a non-metal. Atoms lose or gain electrons to attain a stable, full outer electron shell.
In sodium phosphate, three sodium (Na) atoms each donate an electron to become positively charged ions (cations). The phosphate (PO4) group accepts these electrons to become a negatively charged ion (anion). The electrostatic attraction between the positive sodium ions and the negative phosphate ion forms the ionic bond. These discrete units assemble in a three-dimensional lattice structure in a way that ensures the overall compound is electrically neutral.
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Density = 1.504 g/mL⁻¹
Molar mass HNO₃ =63.01 g/mol
M = 1000 * T* D / mm
M = 1000 * 0.68 * 1.504 / 63.01
M = 1022.72 / 63.01
M = 16.23 mol/L
hope this helps!
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Particulate matter
Contaminated groundwater
Carbon monoxide
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Carbon monoxide is an air pollutant that can contribute to asthma. Therefore, option D is correct.
Carbon monoxide (CO) is a colorless and odorless gas produced by the incomplete combustion of fossilfuels, such as gasoline, coal, and wood. It is primarily emitted by vehicles, industrial processes, and the burning of biomass.
When inhaled, carbon monoxide reduces the blood's ability to carry oxygen, leading to oxygen deprivation in the body. Prolonged exposure to carbon monoxide can worsen asthma symptoms and potentially trigger asthma attacks.
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b. triple point.
c. lambda point.
d. freezing point.
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Answers
Answer: Reducing agent in the given reaction is Sn.
Explanation: Reducing agents are defined as the reagents which reduces the other substance and itself gets oxidized.
Oxidation reactions are defined as the reactions in which loss of electrons occur. the oxidation state of the substance is increased in this type of reaction.
For a given chemical reaction:
On reactant side:
Oxidation state of Hydrogen = +1
Oxidation state of oxygen = -2
Oxidation state of Nitrogen = +5
Oxidation state of Sn = 0
On product side:
Oxidation state of Hydrogen = +1
Oxidation state of oxygen = -2
Oxidation state of Nitrogen = +4
Oxidation state of Sn = +4
From above, the oxidation state of Sn is increasing. So, this element will undergo oxidation reaction and hence, is considered as a reducing agent.