what are the inputs and outputs of a hydroelectric dam?


(science 7th grade)

Answer:

[tex]m=8.7g[/tex]

Explanation:

Hello,

In this case, it is widely known that when measurements with different significant figures are put under mathematical operations, the final result must be displayed with the same amount of significant figures of the shortest measurement, thus, due to the fact that 5.5 g has two significant figures only the result is consequently shown with two significant figures as well as shown down below:

[tex]m=5.5g+2.27g+0.8995g\\\\m=8.6695g[/tex]

By rounding the first six to seven due to the fact that the next six is greater than five, according to rounding rules, the result is:

[tex]m=8.7g[/tex]

Best regards.

Answer:

your answer is protista

Answer:

Plantae

Explanation:

I think the answer is plantae, beacuse plants are heterotrophs.

Answer:

Metals if you dont beleive me here is a picture to prove it

Explanation:

Most of us are solids, shiny, malleable, ductile, and good conductors of heat and electricity. They are metals. The correct option is A).

Metals are those periodic table elements that are malleable, pliable, and ductile because they have valence electrons in their outermost shells, metals are those periodic table elements that are malleable, pliable, and ductile.

They are also exceedingly reactive. In the middle of the periodic table, they can be found. Examples are magnesium, titanium, iron, zinc, and bronze.

Metals can be used to create a variety of items, including jewelry, via foil paper gates. The world's most practical metal is still steel. Non-metals and metalloids do not have these given characteristics.

Thus, the correct option is A) metals.

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Answer:

Explanation:

There are 2 NH4 in the equation therefore just multiply the molarity of the total solution by 2. Aaaaaaaaaaaaaaaaaaaaaaaaaaaand listen to "She Blinded Me With Science" by Thomas Dolby! ;)

Answer:

volatile

Explanation:

They are also poor conductors of electricity for they tend to form negative ions by gaining or sharing electrons [to be stable] unlike the metals. Hence, they have high ionization energy and high electronegativity values. In addition, nonmetals are usually volatile, which means that they evaporate easily

Answer:

The answer would be 2.000 x 10^-30

Explanation:

I had taken the test and got it correct.

Answer:

C. Mantle

Explanation:

mantle is the inside of the Earth

Answer:

C... i think

Explanation:

Answer:

C

Explanation:

They are stabil and full of valence electron.

Considering the definition and properties of noble gases, a full valence electron configuration causes the noble gases to be unreactive. (option C)

Noble gases or inert gases are known as the set of chemical elements that constitute group 18 (VIIIA) of the Periodic Table of the elements.

Noble gases have a very low chemical reactivity. This is because they have a complete valence shell that gives them a low tendency to capture or release electrons. For this reason they have also received the name of inert gases or rare gases.

In other words, the electronic configuration of the noble gases is that their outermost shell or valence shell is always complete, without the need to accept or give up electrons. Then they are in a state of maximum stability.

Because all chemical transformations involve valence electrons, noble gases do not participate in chemical reactions to form chemical compounds, since they are very stable on their own.

In summary, a full valence electron configuration causes the noble gases to be unreactive. (option C)

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law stating that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature

Answer:

Boyle's law is a pressure versus volume relationship. The law was discovered by Robert Boyle in the 17th century. It states the pressure of a fixed amount of a gas is inversely proportional to its volume at a constant temperature.

Explanation:

pressure versus volume relationship

Answer:

7.28×10¯⁴ L

Explanation:

From the question given above, the following data were obtained:

Volume of Nickel (mL) = 0.728 mL

Volume of Nickel (L) =.?

The volume of nickel in litres (L) can be obtained by converting 0.728 mL to L. This can be obtained as follow:

1000 mL = 1 L

Therefore,

0.728 mL = 0.728 mL × 1 L / 1000 mL

0.728 mL = 7.28×10¯⁴ L

Therefore, 0.728 mL is equivalent to 7.28×10¯⁴ L.

B

i hope this helped!

None of the above are correct.

Albert Einstein supported the use of radioactive elements for medical diagnostic purposes.

I hope this helps, good luck!

Answer:

Follows are the solution to this question:

Explanation:

In first point:

Ammonia volumetric flow =   [tex]{105} \frac{m3}{h} = \frac{7}{240} \ \frac{m^3}{ s}[/tex]

Waste gas mole density, dw[tex]= 0.0407 \ \frac{mol}{L} = {40.7} \ \frac{mol}{m^3}[/tex]

Original ammonia mole proportion in receiving waste gas [tex]= 0.120[/tex]

Mole density for ammonia [tex]= 0.120 \times 40.7[/tex]

                                            [tex]= 4.884 \ \ \frac{ \ mol}{ m^3 \text {of its incoming waste}}[/tex]

Therefore, ammonia rate is extracted from its incoming stream

[tex]= NH_3 \text{molecule density} \times \text {Volume flow rate} \\\\ = 4.884\times (\frac{7}{240})\\\\ = 0.14245 \ \ NH_3 \ \ \text{moles per second}[/tex]

As 90 percent ammonia is removed, that ammonia removal rate:

[tex]= 0.9 \times 0.14245 \\\\ = 0.128 \ \ NH_3 \ \text{moles per second} \\\\ = 460.8 \ \ \frac{mol}{h}[/tex]  

In second point:

Ammonia possessing water content [tex]= 0.35\ \ \frac{NH_3}{mole}[/tex]  

Consequently, to maintain 0.128 mol ammonia:

water moles necessary [tex]= \frac{1}{0.35} \times 0.128[/tex]

                                       [tex]= 0.365 \ mol \ water[/tex]

Water atomic weight=[tex]18 g[/tex]

Therefore, mass needed of water [tex]= 18 \times 0.365[/tex]

                                                         [tex]= 6.57 \ g[/tex]  

In this required water range of competencies stream rate:

[tex]= \frac{\text{necessary weight}}{\text{water density}} = \frac{6.57}{0.99} \\\\ = 6.63 \frac{ml}{second} \\\\ = 6.63 \times 10^6 \times 3600 \\\\ = 0.023868 \frac{m^3}{h} \\\\ = 23.868 \frac{L}{h}[/tex]

In third point:

fresh ammonia mol fraction [tex]= \frac{ \text{moles of ammonia from of the outgoing stream} }{\text{maximum moles}}[/tex]

Amino ammonia moles = 10 per cent of the ammonia moles inside an incoming stream = 0.10×initial concentration of the mole:

[tex]= 0.1 \times 4.884\\\\ = 0.484 \ moles[/tex] in an outgoing stream.  

Its total outflow moles = the total ammonia moles at the original ammonia:

[tex]\text{stream moles} = 40.7- (90\% \times 4.884)[/tex]

                     [tex]= 36.3[/tex]

So new ammonina mole fraction:

[tex]= \frac{0.4884}{36.3} \\\\ = 0.01345[/tex]

Answer:

22.2mL de la solución concentrada se requieren

Explanation:

Lo primero que debemos hacer para solucionar este problema es convertir el 5.00% m/v de CaCl₂ a molaridad de Cl⁻:

5g/100mL = 50g/L

Masa molar CaCl₂: 110.98g/mol.

50g * (1mol / 110.98g) = 0.45 moles CaCl₂/L = 0.45M* 2 = 0.90M Cl⁻ (Se multiplica por dos ya que son dos moles de Cl⁻ por mol de CaCl₂

Ahora, si deseas 4.00L de una solución 5.00x10⁻³M, necesitas:

4.00L * (5.00x10⁻³ moles Cl⁻ / L) = 0.02 moles Cl⁻

Como estas moles vienen de la solución 0.90M:

0.02 moles Cl⁻ * (1L / 0.90 moles) = 0.0222L =

Hi There!!

Your best answer choice is:

C. It converts electric energy to another form of energy.

Because, A electric toaster is considered a resistor because it coverts some of it energy into another form which is heat. a resistor is something that limits the flow of an electric current through a circuit.

[tex]GoodLuck!![/tex]

[tex]_{Loserbrazts}[/tex]

An electric toaster is considered a resistor because it converts electric energy to another form of energy. Therefore, the correct option is option C.

A "resistor" is a passive components electric device that is utilized to limit and regulate the electric current that flows in electrical circuits. It also allows us to provide a variable amount of resistance to something like an electrical circuit. Resistors are the most significant and widely utilized components in an electrical circuit.

The primary function of a resistor would be to decrease current flow but also voltage inside a specific area of the circuit. It is constructed of copper wires wound around with a ceramic rod and covered with insulating paint. Toaster  converts electric energy to another form of energy.

Therefore, the correct option is option C.

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Answer:

15 atoms

Explanation:

plz mark as brainliest

Answer:

They are two different objects and they measure things differntly

Explanation:

Answer:

Meters, kilograms, kelvin, candela, mole, ampere, seconds.

Explanation:

These are the seven different types of measurements in chemistry. Hope it helps!

Answer:

The body gain the energy through the digestion of the food we eat and when it is breakdown it releases energy.

Explanation:

The food we consumed is digested by the activities of acids and enzymes in the stomach.

Carbohydrates are the primary source of body energy.

When it is eaten, it digestion starts from the mouth when it mixed with the saliva released from the salivary gland and salivary amylase acts on it.

When it's get to the stomach/ intestine, it is further breakdown through the activities of enzymes into glucose.

The stomach and the intestine absorb the glucose and release it into the blood stream. Glucose can be use as energy source or stored later and insulin help to release it.

Answer:

Explanation:

When the food substances (for example carbohydrate) that contain chemical potential energy are broken down, they produce glucose. Carbohydrate is the major source of glucose for the body, the digestion of carbohydrate begins in the mouth in the presence of the enzyme called amylase.

When glucose is produced from carbohydrate breakdown, the glucose is picked up by insulin which allows the glucose enters the cells. In the cells, these glucose molecules undergo glycolysis (glucose breakdown/catabolism) in order to produce ATP (high energy molecules that provides energy for all cell). When ATP is produced, the cells use the ATP to carry out several body and biological functions. These multi-enzyme steps explains how the body gains this energy.

Answer:

D

Explanation:

two different types of elements combine to form an acid

Answer:

Smaller molecules migrate through the gel more quickly and therefore travel further than larger fragments that migrate more slowly and therefore will travel a shorter distance. As a result the molecules are separated by size.

Explanation:

Answer:

Question is incomplete.

Answer:

The molar heat capacity at constant volume is 21.62 JK⁻¹mol⁻¹

The molar heat capacity at constant pressure is 29.93 JK⁻¹mol⁻¹

Explanation:

We can calculate the molar heat capacity at constant pressure from

[tex]C_{p,m} = \frac{C_{p} }{n}[/tex]

Where [tex]C_{p,m}[/tex] is the molar heat capacity at constant pressure

[tex]{C_{p} }[/tex] is the heat capacity at constant pressure

and [tex]n[/tex] is the number of moles

Also [tex]{C_{p} }[/tex] is given by

[tex]{C_{p} } = \frac{\Delta H}{\Delta T}[/tex]

Hence,

[tex]C_{p,m} = \frac{C_{p} }{n}[/tex] becomes

[tex]C_{p,m} = \frac{\Delta H }{n \Delta T}[/tex]

From the question,

[tex]\Delta H[/tex] = 229.0 J

[tex]n[/tex] = 3.00 mol

[tex]\Delta T[/tex] = 2.55 K

Hence,

[tex]C_{p,m} = \frac{\Delta H }{n \Delta T}[/tex] becomes

[tex]C_{p,m} = \frac{229.0}{(3.00) (2.55)}[/tex]

[tex]C_{p,m} =[/tex] 29.93 JK⁻¹mol⁻¹

This is the molar heat capacity at constant pressure

For, the molar heat capacity at constant volume,

From the formula

[tex]C_{p,m} = C_{v,m} + R[/tex]

Where [tex]C_{v,m}[/tex] is the molar heat capacity at constant volume

and [tex]R[/tex] is the gas constant ([tex]R[/tex] = 8.314 JK⁻¹mol⁻¹)

Then,

[tex]C_{v,m} = C_{p,m} - R[/tex]

[tex]C_{v,m} = 29.93 - 8.314[/tex]

[tex]C_{v,m} =[/tex] 21.62 JK⁻¹mol⁻¹

This is the molar heat capacity at constant volume

Answer:It is a mixture

Explanation:

If it is pure sugar it’s neither but if it has water it is a homogeneous mixture

Mixture are produced by the physical combination of two or more components.  A compound is formed by the chemical bonding of atoms. Sugar water is an example of homogeneous mixture.

Compounds are formed by the combination of atoms or molecules through chemical bonding. There are various kinds or compounds based on the type bonding such as ionic, covalent, metallic etc.

Mixtures are formed by the physical combination of two or more components. However, mixture can be chemically bonded particles. There are two types of mixtures. Homogeneous mixtures are formed by uniform distribution of particles.

Homogenous mixtures appear to be one compound since it have only one phase. Heterogenous mixtures are exhibiting separated phases and the particles are randomly distributed here.

Sugar water is formed by dissolving sugar on water where, the sugar is completely dissolved in water and thus is an example  of homogenous mixture.

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Answer:

the nervous system

Explanation:

Answer:

central nervous system

Explanation:The brain and the spinal cord are the central nervous system. The nerves that go through the whole body make up the peripheral nervous system.

Given :

Mass of [tex]H_2SO_4[/tex] is 571.6 g per liter .

Density of solution , [tex]\rho=1.329\ g/cm^3[/tex] .

To Find :

a. Mass percentage

b. Mole fraction

c. Molality

d. molarity of H2SO4 in this solution.

Solution :

Molar mass of [tex]H_2SO_4[/tex] , m = 1329 g/mol .

a ) Mass of [tex]H_2SO_4[/tex] contain in 1 liter is 1329 g .

[tex]mass \ \%=\dfrac{571.6}{1329}\times 100=43.01 \%[/tex]

b ) Moles of [tex]H_2SO_4[/tex] = [tex]\dfrac{571.6\ g}{98\g/mol}=5.83\ mol[/tex] .

Moles of [tex]H_2O[/tex] = [tex]\dfrac{1329-571.6\ g}{18\ g/mol}=42.08\ mol[/tex] .

Mole fraction [tex]=\dfrac{5.83}{5.83+42.08}=0.12[/tex] .

c ) Molarity of [tex]H_2SO_4[/tex]  [tex]=\dfrac{5.83\ mol}{1 \ L}=5.83\ M[/tex] .

Hence , this is the required solution .

Answer:

a. x3 and x4 are the first to agree to two significant figures

b. x4 and x5 are the first to agree to three significant figures

Explanation:

8.30 x 10⁻⁵ = x1(0.100)²

8.30 x 10⁻⁵ = 0.01x1

x1 = 8.30 x 10⁻⁵/0.01 = 0.0083

8.30 x 10⁻⁵ = x2(0.100 + 0.0083)²

8.30 x 10⁻⁵ = (0.01172889)x2

x2 = 8.30 x 10⁻⁵/0.01172889

x2 = 0.007076543475128

8.30 x 10⁻⁵= x3 (0.100 + 0.007076543475128)²

8.30 x 10⁻⁵ = 0.011465386162581)x3

x3 = 8.30 x 10⁻⁵/0.011465386162581

x3 = 0.007239180505832

8.30 x 10⁻⁵ = x4 (0.100 + 0.007239180505832)²

8.30 x 10⁻⁵ = (0.011500241835562) x4

x4 = 8.30 x 10⁻⁵/0.011500241835562

x4 = 0.007217239531723

8.30 x 10⁻⁵ = x5 (0.1 + 0.007217239531723)²

8.30 x 10⁻⁵ = (0.011495536452803) x5

x5 = 8.30 x 10⁻⁵/0.011495536452803

x5 = 0.007220193710904

From the above results;

a. x3 and x4 are the first to agree to two significant figures

b. x4 and x5 are the first to agree to three significant figures

Answer:

187.3mL of 2.65M KOH you must add

Explanation:

The pH of the buffer of acetic acid is obtained as follows:

pH = pKa + log [Acetate] / [Acetic Acid]

Where [] could be moles of acetate and acetic acid

Replacing:

5.24 = 4.76 + log [Acetate] / [Acetic Acid]

0.48 = log [Acetate] / [Acetic Acid]

3.01995 = [Acetate] / [Acetic Acid](1)

As concentration of acetic acid is 0.796M and volume is 830mL, the moles of acetic buffer is:

0.830L * (0.796 moles / L) = 0.6607 moles

Thus:

0.6607 moles = [Acetate] + [Acetic Acid] (2)

Replacing (2) in (1):

3.01995 = 0.6607 moles - [Acetic Acid] / [Acetic Acid]

3.01995 [Acetic Acid] = 0.6607 moles - [Acetic Acid]

4.01995 [Acetic Acid] = 0.6607 moles

[Acetic Acid] = 0.16435 moles

[Acetate] = 0.6607 moles - 0.16435 moles = 0.49635 moles

The reaction of acetic acid with KOH to produce Acetate is:

Acetic acid + KOH → Acetate + Water

That means the moles of KOH you add, are the moles of acetate.

To add 0.49635 moles of 2.65M of KOH you need:

0.49635 moles * (1L / 2.65 moles) = 0.1873L =