9. If the limits of cow hearing are 23 Hz to 35,000 Hz, what are the sound wavelengths that are
associated with both of these two extremes, assuming the speed of sound is 345 m/s.
Frequency= 23 Hz: Wavelength =
Frequency = 35,000 Hz: Wavelength =

Answer: The ratio of number of hydroxide ions to iodide ions is 2 : 1.

Explanation:

The chemical equation for the oxidation of iodide ion is oxidized to hypoiodite ion by permanganate follows:

[tex]2MnO_4^-+I^-+H_2O\rightarrow 2MnO_2(s)+IO_3^{-}+2OH^{-}[/tex]

According to mole concept:

1 mole of a substance contains [tex]6.022\times 10^{23}[/tex] number of particles

Moles of iodide ions = 1 mole

Number of iodide ions = [tex](1\times 6.022\times 10^{23}[/tex]

Moles of hydroxide ions = 2 mole

Number of hydroxide ions = [tex](2\times 6.022\times 10^{23}[/tex]

Taking the ratio of number of hydroxide ions and number of iodide ions are as follows:

[tex]\frac{\text{Number of hydroxide ions}}{\text{Number of iodide ions}}=\frac{(2\times 6.022\times 10^{23})}{(1\times 6.022\times 10^{23})}\\\\\frac{\text{Number of hydroxide ions}}{\text{Number of iodide ions}}=\frac{2}{1}[/tex]

Hence, the ratio of number of hydroxide ions to iodide ions is 2 : 1.

Answer:

B,C,F

Explanation:

Answer:

b c f

Explanation:

Answer:

D. The model can be observed from the classroom more easily

Explanation:

From the concept of using wire coil to model and the concept of using spring coil to measure, we can come to the conclusion that the correct answer is Option D.

Answer: ENERGY: A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another; the levels in the food chain are producers, primary consumers, higher-level consumers, and finally decomposers. These levels are used to describe ecosystem structure and dynamics.

MATTER: When one organism eats another, the matter, or carbon, nitrogen, and other essential elements, are transferred from one to the other. These elements move from the producers, to the consumers, and eventually to the decomposers, cycling the matter through the ecosystem.

Explanation: look up

Answer:

Explanation:

The answer is 32°F or 0° Celsius.

Hope it helped you.

Answer:

Answers with detail are given below.

Explanation:

C₆H₁₂O₆   →   2C₂H₅OH  + 2CO₂

Anaerobic respiration in plants produced ethanol which if accumulate then cause the harmful effect in plants. It is also occur in some microorganisms such as yeast.

C₆H₁₂O₆    →   2C₃H₆O₃

Anaerobic respiration in animals pyruvate converted into lactic acid and it is not as harmful as ethanol in plant if accumulate. It is produced during exercise. It can produce the cramps which can be cured with massage.

C₆H₁₂ + O₂       →       CO₂ + H₂O

This reaction is the combustion reaction of cyclohexane. Cyclohexane burnt in the presence of oxygen and form water and carbon dioxide.

Explanation:

In fluorine

protons = 9

Neutrons = 10

Electrons = 9

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Explanation:

The tendency of metals to lose electrons is a measure of their electropositivity or metallicity.

Electropositivity is a measure of the tendency of atoms of an element to lose electrons. It is closely related to ionization energy and electronegativity of an element.

Answer:

OH⁻(aq) + H⁺(aq) ⇒ H₂O(l)

Explanation:

Let's consider the molecular equation that occurs when aqueous solutions of lithium hydroxide and hydrobromic acid undergo a neutralization reaction.

LiOH(aq) + HBr(aq) ⇒ LiBr(aq) + H₂O(l)

The complete ionic equation includes all the ions and the molecular species.

Li⁺(aq) + OH⁻(aq) + H⁺(aq) + Br⁻(aq) ⇒ Li⁺(aq) + Br⁻(aq) + H₂O(l)

The net ionic equation includes only the ions that participate in the reaction and the molecular species.

OH⁻(aq) + H⁺(aq) ⇒ H₂O(l)

Answer: B -2.37 -0.34

Explanation: A P E X

The redox reaction consists of the reduction and the oxidation halves and involves the transfer of electrons. The overall voltage for the Mg and Cu is 0.34 - (-2.37). Thus, option C is correct.

A nonspontaneous redox reaction is the loss and gain of the electrons when an external source of voltage is applied to initiate the electrochemical reaction.

The overall voltage of the redox reaction can be given by the oxidation and the reduction of half of the cell as,

Oxidation half: Mg(s) → Mg₂⁺ + 2e⁻  E° = -2.37 v

Reduction half: Cu₂⁺ + 2e⁻ → Cu(s)  E° = + 0.34 v

The overall voltage of the cell (E° cell) is calculated as,

E° cell = E°(reduction) - E°(oxidation)

= +0.34 - (-2.37)

= 2.71 v

Therefore, option C. 0.34 - (-2.37) is the overall voltage for the nonspontaneous redox reaction.

Learn more about redox reaction here:

https://brainly.com/question/14217644

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Your question is incomplete, but most probably your full question was, What is the overall voltage for a redox reaction with the half-reactions Mg(s) → Mg₂⁺ + 2e⁻ and Cu₂⁺ + 2e⁻ → Cu(s)?

A. -2.37 - 0.34

B. 0.34 - 2.37

C. 0.34 - (-2.37)

D. 2.37 - 0.34

Answer:

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Explanation:

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Answer:

Chlorine gas.

Explanation:

Hello!

In this case, the undergoing chemical reaction is:

[tex]2Na+Cl_2\rightarrow 2NaCl[/tex]

Thus, given the moles of reacting both sodium and chlorine, we compute the moles of sodium chloride yielded by each reactant by considering the 2:2 and 1:2 mole ratios:

[tex]n_{NaCl}^{by\ Na}=6.70molNa*\frac{2molNaCl}{2molNa}=6.70molNaCl \\\\n_{NaCl}^{by\ Cl_2}=3.20molCl_2*\frac{2molNaCl}{1molCl_2}=6.40molNaCl[/tex]

Thus, since chlorine yields less moles of sodium chloride, we infer it is the limiting reactant.

Best regards!

Answer:

The periodic table of elements puts all the known elements into groups with similar properties. This makes it an important tool for chemists, nanotechnologists, and other scientists. If you get to understand the periodic table and learn to use it, you'll be able to predict how chemicals will behave.

Answer:

Okayy

Explanation:

The periodic table arranges the chemical elements

All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods

It have many properties. Each column is called a group.

ALSO Metals are placed on the left-hand side of the periodic table , and non-metals on the right.

Metalloids can also be called semimetals. On the periodic table, the elements colored yellow, which generally border the stair-step line, are considered to be metalloids.

Answer:

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Answer:

Yes and her last word was meat

Explanation:

Sasha supremacy

Answer:

air

Explanation:

Vocal folds vibrate when excited by aerodynamic phenomena; they are not plucked like a guitar string. Air pressure from the lungs controls the open phase. The passing air column creates a trailing “Bernoulli effect,” which controls the close phase.

Answer:

Stinging cell, nematocysts.

Explanation:

Corals have tentacles present near the oral opening. The tentacles comprise cells called stinging cells. These cells contain nematocysts used by corals to sting the prey and stun them using the tentacles. These stinging cells present near the mouth which contains nematocysts that is an organelle that produces toxic substances used by the coral to catch their prey.

Answer:

Mass = 2.59 g

Explanation:

Given data:

Mass of AgS = 3.45 g

Mass of silver = ?

Solution:

Number of moles of AgS:

Number of moles = mass/molar mass

Number of moles = 3.45 g/ 139.93 g/mol

Number of moles = 0.024 mol

1 mole of AgS  contain 1 mole of Ag.

0.024 mol contain 0.024 mol of Ag.

Mass of silver:

Mass = number of moles × molar mass

Mass = 0.024 mol × 107.86 g/mol

Mass = 2.59 g

When a liquid changes into a solid, it is called solidification. When a gas changes into a solid, it is called deposition . When a liquid changes into gas, it is called evaporation. Phase changes are usually caused by changes in temperature or pressure.

Answer:

Exothermic

Explanation:

We as humans do not absorb heat. A good way to think about it is that when we workout we use energy from our body which causes our body temperature to rise. The energy used from food maintains our blood, respiration, and other systems in optimal condition. This requires energy from our body which ends up leaving the body as heat.

Explanation:

Interionic Attractions are when an ion is surrounded by an ionic atmosphere which has a net charge opposite for its own. ... The ionic atmosphere cannot created nor destroyed. In solutions with weak electrolytes the number of ions is not large, therefore the effect of the interionic attraction is small.

Answer:

Na(s) + H₂O (l) → NaOH(aq) + H₂(g).

Explanation:

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Answer:

a) 15.3 mol O₂

b) 10.2 mol CO₂; 13.6 mol H₂O

Explanation:

Step 1: Write the balanced equation

2 C₃H₇OH + 9 O₂ ⇒ 6 CO₂ + 8 H₂O

Step 2: Calculate the moles of O₂ that react with 3.40 moles of C₃H₇OH

The molar ratio of C₃H₇OH to O₂ is 2:9. The moles of O₂ required are 9/2 × 3.40 mol = 15.3 mol

Step 3: Calculate the moles of CO₂ produced from 3.40 moles of C₃H₇OH

The molar ratio of C₃H₇OH to CO₂ is 2:6. The moles of CO₂ produced are 6/2 × 3.40 mol = 10.2 mol

Step 4: Calculate the moles of H₂O produced from 3.40 moles of C₃H₇OH

The molar ratio of C₃H₇OH to H₂O is 2:8. The moles of H₂O produced are 8/2 × 3.40 mol = 13.6 mol

Answer:

60

Explanation:

The formula of the compound is given as:

              HC₂H₃O₂

To find the formula mass we sum up the atomic masses of the component elements;

  Atomic mass:

         H  = 1

         C  = 12

         O = 16

 HC₂H₃O₂  = 1 + 2(12) + 3(1) + 2(16)

                   = 1 + 24 + 3 + 32

                   = 60

Answer:

Mass = 0.44 g

Explanation:

Given data:

Mass of vanadium =  ?

Number of atoms of vanadium = 5.2 × 10²¹ atoms

Solution:

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

5.2 × 10²¹ atoms ×  1mol / 6.022 × 10²³ atoms

0.86× 10⁻²  mol

0.0086 mol

Mass of vanadium:

Mass =  number of moles × molar mass

Mass = 0.0086 mol × 50.9 g/mol

Mass = 0.44 g

Answer:

Over time, the Sun's differential rotation rates cause its magnetic field to become twisted and tangled. The "tangles" in the magnetic field lines can produce very, very strong localized magnetic fields. Places where "ropes" of bundled field lines "break" the surface of the Sun are active regions where sunspots form.

Answer:

Her speed is 1.1 m/s, and her velocity is 0 m/s.

Explanation:

Hello!

In this case, since the speed is the defined as the distance traveled over the elapsed time:

[tex]s=\frac{d}{t}[/tex]

And the velocity is defined as the change in displacement over the time interval:

[tex]v=\frac{\Delta d}{\Delta t}[/tex]

Thus, since the total distance traveled was 400 m and the total time 6 mins (360 s), we compute the speed as:

[tex]s=\frac{400m}{360s}=1.1m/s[/tex]

And the velocity is 0 m/s because the initial point is the very same final point as the track was circular. Therefore the answer is Her speed is 1.1 m/s, and her velocity is 0 m/s.

Best regards!

Answer: 1) chemical change 2) chemical properties 3) ratio? 4) created nor destroyed

Explanation: 1) Matter is composed of exceedingly small particles called atoms. An atom is the smallest unit of an element that can participate in a chemical change. 2) A macroscopic sample of an element contains an incredibly large number of atoms, all of which have identical chemical properties. 3) A compound consists of atoms of two or more elements combined in a small, whole-number ratio. In a given compound, the numbers of atoms of each of its elements are always present in the same ratio. 4) Atoms are neither created nor destroyed during a chemical change, but are instead rearranged to yield substances that are different from those present before the change