HELP!
5. From which location in the image would
a concert viewer experience the sound
waves with the greatest intensity?
A. location A
B. location B
C. location C

Answer:

m=0.000107 kg

Explanation:

H=m*cp*change in temperature

0.296=m*4182*0.661

m=0.000107 kg

Using the ideal gas law PV =nRTPV=nRT , we find that the pressure will be P =\frac{nRT}{V}P=

V

nRT

​

 . Then, we'll substitute and find the pressure, using T = -25 °C = 248.15 K and R = 0.0821 \frac{atm\cdot L}{mol \cdot K}

mol⋅K

atm⋅L

​

 :

P =\frac{nRT}{V} = \frac{(0.33\,\cancel{mol})(0.0821\frac{atm\cdot \cancel{L}}{\cancel{mol \cdot K}})(248.15\,\cancel{K})}{15.0\,\cancel{L}} = 0.4482\,atmP=

V

nRT

​

=

15.0

L

​

(0.33

mol

)(0.0821

mol⋅K

atm⋅

L

​

​

)(248.15

K

​

)

​

=0.4482atm

In conclusion, the pressure of this gas is P=0.4482 atm.

Reference:

Chang, R. (2010). Chemistry. McGraw-Hill, New York.

Answer: Milligrams

Explanation:

Vitamins are measured in Milligrams because if used grams, there would be a higher dose.

Answer: 1.14 M

Explanation:

500 mL is equal to 0.5 L.

So, the molarity is (0.570)/(0.5) = 1.14 M

Answer:

B

Explanation:

Answer:

Explanation:

By definition 3 moles of water molecules. Or about 3 * 6.022140E23 water molecules = 1.806642E24 water molecules.

hope this is right..

Answer: Simply multiply Avogadro's number(6.02x10^23) by 3 and that's your answer. Use a scientific calculator

Explanation:

Answer:

It's 1, places that are closer to the equator receive more direct sunlight and have

Explanation:

The partial pressure of carbon dioxide is 75 torr.

Dalton's theory of gas states that total pressure of the mixture of gas sample is equal to the sum of the partial pressure of all the gases present in that sample.

Given that,

On putting values, we get

Partial pressure of carbon dioxide = 825 - (600 + 150) = 75 torr

Hence Partial pressure of carbon dioxide is 75 torr.

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When for a solution concentration of hydroxide ions becomes equal to the concentration of hydronium ions, its pH becomes equal to 7.

pH of any solution is used to define the acidity, basicity or neutrality of the solution.

When the concentration of hydronium ion is equal to the concentration of the hydroxide ion then the resultant solution will be neutral, as they have a pH equals to 0.

Hence, pH of the solution becomes equal to 7.

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Answer:

The answer is B. sound; light

Explanation:

Answer:

False

Bouyant force = volume of displaced fluid * density of fluid

That's correct! When two different air masses meet, the boundary zone between them is called a front. The process of formation of the fronts is known as frontogenesis.

---

Hope this helps! :)

Voltage-gated sodium channels are the ion channels that conduct sodium ions. They are sensitive to the extracellular concentration of calcium ions.

Voltage-gated sodium channels are the signaling ion channels that are responsible for increasing the action potential of the nerve cells. VGSC is the most important resting and action potential of the cell.

These channels are sensitive to the high concentration of calcium ions as these ions cause the channels to open up on the membrane surfaces of the cell. This causes a change in the concentration of the gradient across the membrane.

Therefore, VGSC is sensitive to calcium ions.

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[tex]\huge{\green}\fcolorbox{blue}{cyan}{\bf{\underline{\red{\color{red}Answer}}}} [/tex]

3.745 x [tex]10^{-19}J[/tex] is the minimum energy needed to eject electrons from a metal with a threshold frequency of 5.65 x [tex]10^{14}s^{-1}[/tex]

The minimum frequency needed to cause electron ejection is referred to as the threshold frequency.

The energy carried by the incident light is E=hf

Where h is the Planck constant and f is the frequency of the light. The threshold frequency is the frequency that corresponds to the minimum energy needed to eject the electrons from the metal, so if we substitute the threshold frequency in the formula, we get the minimum energy the light must have to eject the electrons:

E=hf

h=6.63 x [tex]10^{-34}Js[/tex]

f=5.65 x [tex]10^{14}s^{-1}[/tex]

E=6.63 x [tex]10^{-34}Js[/tex] x 5.65 x [tex]10^{14}s^{-1}[/tex]

E= 3.745 x [tex]10^{-19}J[/tex]

Thus, 3.745 x [tex]10^{-19}J[/tex] is the minimum energy needed to eject electrons from a metal with a threshold frequency of 5.65 x [tex]10^{14}s^{-1}[/tex]

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Answer:

all of the above

Explanation:

chlorophyll in found in virtually all photosynthetic organisms

The amount in grams of oxygen are needed to react with 25g of Mg is 16.48 grams.

Mass into moles or vice versa of any substance will be calculated by using the below formula as:

n = W/M, where

W = given mass

M = molar mass

Moles of Magnesium = 25g / 24.3g/mol = 1.028 = 1.03 mol

Chemical reaction will be:
2Mg + O₂ → 2MgO

From the stoichiometry of the reaction it is clear that 1 mole of oxygen is reacts with 2 moles of magnesium, so 1.03 moles of magnesium will reacts with (1/2)(1.03) = 0.515 moles of oxygen.

Mass of oxygen = (0.515mol)(32g/mol) = 16.48g

Hence required mass of oxygen is 16.48 grams.

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The species that is the conjugate acid is HC₂H₃O₂(aq). The correct option is d.

Conjugates acids are those acids which are made when an acid donates a proton to a base according to Bronsted Lowry theory.

In other words, we can say that it is an acid with hydrogen ion. An example is  water (base) reacting with an acid to form the hydronium ion (conjugate acid).

Thus, the correct option is d, HC₂H₃O₂(aq).

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Answer:

the 3 in the middle

Explanation:

There are 5 signs of chemical changes these are odor change,color change, temperature change, production of gas and creation of precipitation.

A car bumper is primarily meant to reduce the impact of damages to the front and rear ends of vehicles in case of collision.

Cars are equipped with bumpers both at the rear and front ends primarily for protective purposes.

The front end bumper reduces the impact of front collisions on the cooling system and the bonnet while the rear end bumper functions to protect the exhaust, the trunk, and several other parts in case of rear-end collisions.

Aside from protective functions, bumpers also serve to add beauty to cars.

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The quantity of carbon tetrachloride, CCl₄ she will use to make her conversion is molar mass

The mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

Mole = mass / molar mass

Mole of CCl₄ = 150 / 154

Mole of CCl₄ = 0.974 mole

Thus, we can see that the molar mass of CCl₄ is needed to obtain the number of mole.

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The time taken by Carbon-14 to decay radioactively from 120g to 112.5g is 22,920 years.

Time required for the whole radioactive decay of any substance will be calculated by using the below link:

T = (n)(t), where

Initial mass of Carbon-14 = 120g

Final mass of Carbon-14 = 112.5g

Left mass = 120 - 112 = 7.5g

Number of required half life for this will be:

4 half lives are required, now on putting values we get

T = (4)(5730) = 22,920 years

Hence required time for the decay is 22,920 years.

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Answer:

b

Explanation:

b is the answer to your question

Answer:

When chlorine (Cl 2 ) gas is passed through an aqueous solution of potassium iodide (KI), the products formed are solid iodine (I2) and potassium chloride (KCl). This is a displacement reaction in which the less reactive iodine in potassium iodide is displaced by the more reactive chlorine. The equation can be written as:

2KI(aq)+Cl2(g)→2KCl(aq)+I2 (s)

An aqueous solution contains the following ions Cl⁻, Ag⁺, Pb²⁺, NO₃⁻ & SO₄²⁻ and more than one precipitate will form are AgCl, PbCl₂, PbSO₄ & Ag₂SO₄.

Precipitate is the insoluble compound which is present at the bottom of any chemical reaction in the solid state.

If in an aqueous solution Cl⁻, Ag⁺, Pb²⁺, NO₃⁻ & SO₄²⁻ ions are present then:

Hence precipitates are AgCl, PbCl₂, PbSO₄ & Ag₂SO₄.

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Answer:

it looks smaller for sure ^_^

The molarity of solution which is prepared by dissolving 7. 31 g of Na₂SO₄ in enough water to make 225 ml of solution is 0.22M

Molarity of the solution will be calculated by using the below equation as:

M = n/V, where

n = W/M, where

n = 7.31/142 = 0.05 mol

On puttig values, we get

M = 0.05 / 0.225 = 0.22M

Hence required molarity is 0.22M.

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