What is the freezing point of a solution that has 5.0 moles of Nal in 1250 g of water? (K = 1.86°C/m; molar
mass of water = 18.0 g)

Answer:

has a highly ordered microscopic structure

Answer:

Mushroom and algae are part of the fungi group

Answer:

3 moles of CaO

Explanation:

The chemical balanced equation is;

2Ca + O₂ → 2CaO

The ratio of calcium(Ca) to Calcium Oxide(Cao) in this equation is 2:2.

Now, when 3 moles of calcium react with oxygen, Cao produced will be;

3 moles of O₂ × 2 moles of CaO/2 moles of Cao = 3 moles of CaO

Answer:

-what color is the tube: Transparent

-is the reaction reversible: what reaction

-has the reaction reached equilibrium: I don't see a reaction

BTW you didn't provide all the information.

Answer:

600k

Explanation:

6300j//390j/g

=600k

Answer: The given reaction is a double displacement reaction.

Explanation:

A chemical reaction equation in which both positive and negative ions of two different reactants are exchanged then it is called a double displacement reaction.

For example, [tex]Na_{2}SO_{4} + H_{2}O \rightarrow H_{2}SO_{4} + Na_{2}O[/tex]

Here, hydrogen ions of [tex]H_{2}O[/tex] are replaced by the sodium ions of [tex]Na_{2}SO_{4}[/tex]. Also, sulfate ion of [tex]Na_{2}SO_{4}[/tex] are replaced by oxygen ion of [tex]H_{2}O[/tex].

Thus, we can conclude that the given reaction is a double displacement reaction.

Answer:

Hydrogen

Explanation:

BECAUSE IT HAS NO NEURTONS!!

Answer:

2.13 Kg/cm².

Explanation:

We'll begin by calculating the constant that exist between the pressure and the volume. This can be obtained by using the Boyle's law equation as shown below.

Boyle's law states that

PV = K

Where

P is the pressure.

V is the volume.

K is the constant.

We shall determine the value of K as follow:

Pressure (P) = 1.15 Kg/cm²

Volume (V) = 44.8 mL

Constant (K) =?

PV = K

1.15 × 44.8 = K

K = 51.52 Kg/cm²•mL

Finally, we shall determine pressure, when the volume is 24.2 mL. This can be obtained as follow:

Volume (V) = 24.2 mL

Constant (K) = 51.52 Kg/cm²•mL

Pressure (P) =?

PV = K

P × 24.2 = 51.52

Divide both side by 24.2

P = 51.52 / 24.2

P = 2.13 Kg/cm²

Therefore, the pressure is 2.13 Kg/cm².

Answer:

In this earthquake-resistant building, two steel supports in the shape of an X (A) help to reinforce walls. Concrete walls with steel bars in them (B) lessen any rocking movements. Shock absorbers (C) take up some of the building’s kinetic energy during a quake. I could use the toothpicks as the two steel in the shape of an X. The concrete walls and the shock absorbers would be the marshmallows.

Features shown by points A, B & C are reinforce walls, concrete walls and shock absorbers respectively.

Earthquake is a kind of natural disaster in which an intense shaing of the earth's outermost layer takes place.

According to the image following points we will consider as:

We can use the toothpicks in the shape of X as the two steel and concrete walls & the shock absorbers as the marshmallows.

Hence, marshmallows are used as the concrete walls and toothpicks are used as two steel rods.

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Answer: Positive tropism, negative tropism

Explanation:

Stimulus can be define as external and internal agent which generate a response in an organism. If the growth and action is towards the stimulus it is called as positive tropism. If the growth and action is away from the stimulus it is called as negative tropism. Example, the growth of the stem towards the sunlight is called positive tropism whereas the growth of the root away from the sunlight is called negative tropism. Here, sunlight is the stimulus.

Answer:

See the explanation below

Explanation:

Both the cup of coffee and drop of coffee have the Same temperature of 95°C.

Although the difference is the cup of coffee has more heat contained in it than the drop of coffee. An explanation is when we heat a cup of coffee it will take more time to Attain in 95°C while the drop of coffee will take less time

Answer:

B) 0.6M

Explanation:

               I apologize in advance if it is not correct :l

The (M1V1= M2V2) is given for you to plug in the correct numbers so let's jot this down.

                    (M1*V1= M2*V2)

so they give us 6M which would be our (M1), from this we can also conclude that 5mL is also V1; ( if you notice the M1's and V1's are always found next to eachother). This leads us to our 50mL, this would be our V2 because the volume went from 5mL to 50mL. Now lets put this in order based on what we know.

M1= 6M                                (M1*V1= M2*V2)

V1= 5mL

M2= ?

V2= 50mL

now we plug in what we know into the equation to find the unknown (M2)

                   (6M*5mL= M2*50mL)

now we could do the long math, but I don't think your on brainly to do the hard way. so lets keep it simple!

                   We are going to put the 50mL under the (6M*5mL) for division.

                             [tex]\frac{(6M*5mL)}{(50mL)}[/tex] This is honestly MUCH easier, than manually answering. you just put that in the calculator and it'll give you B) 0.6M

   honestly though I might not know what I'm doing cuz im currently doing my test and decided to answer this question ;)

        Good Luck!

The reason behind an increased population of any organism is a lack of predators, favorable habitat, good food source.

Jellyfishes are umbrella-shaped, free-living marine animals.

They have long tentacles which are highly dangerous.

They are not true fishes.

The reasons for the increase in the number of organisms in an area:

Predators are animals who eat another small animal for their survival. If there is less number of predators of any organism, their population increase.

Favorable environmental conditions are another reason for the population increase of a population.

Food availability.

Thus, these are the reason for an increase in population.

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Answer:

I dont understand

Explanation:

818191919

Answer:

107.87 grams

Explanation:

One mole of silver weighs 107.87 grams .

Answer:

Greenhouse Gases

Explanation:

Answer:

at the nuclear reactor site

Explanation:

In the United States, liquid high-level waste is stored in underground tanks pending vitrification. High-level waste is stored at the nuclear reactor site.

Such waste was created by the weapons programs of the cold war and the Manhattan project. This waste can not be vitrified as there were not enough funds for further processing.

Answer:

at the nuclear reactor site

Explanation:

Answer:

Elevated [CO2] increases the availability of carbon in leaves causing greater Rubisco activity and higher rates of photosynthesis. Greater photosynthesis increases the content of non-structural carbohydrates in leaves which can lead to greater starch reserves and increased auxin biosynthesis.

Explanation:

Hope it helps

FOLLOW MY ACCOUNT PLS PLS

Answer:

solution given:

Explanation:

4Fe +3O2------------>2Fe2O3

4mole. 3mole. 2 mole

224g. 96g. 320g

we have

224 g of fe needed to react completely with 96 g of O2

500g of fe needed to react completely with

96 ×500/224=214.3g of O2

214.3g of O2 is a required answer.

"The mass of [tex]O_{2}[/tex]  will be 214.3g to completely react with 500 g of Fe."

What is mass?

A physical body's mass is the amount of matter it contains. It can  also use to measure  moment of inertia, or the resistance to movement when one net force is exerted. The degree of an object's gravitational pull to other bodies is also determined by its mass. The kilogram is the SI base unit of mass.

The reaction between Fe and [tex]O_{2}[/tex] can be written as:

[tex]4Fe+3O_{2}[/tex] → [tex]2Fe_{2}O_{3}[/tex]

It can be see that 4 mole of iron is reacts with 2 mole of oxygen and its form 2 mole of [tex]2Fe_{2}O_{3}[/tex]

So, 224 g of iron is needed in the reacted with oxygen (96 g).

500 g of iron will be needed = 96× 500/224= 214.3g of  [tex]O_{2}[/tex].

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Answer:

A liver

B small intestine

Answer:

0.629 gramos de PH3 es la máxima de cantidad que puede ser producida.

Explanation:

¡Hola!

En este caso, dado que tenemos la siguiente reacción química, la cual se puede balancear directamente:

[tex]Ca_3P_2+6H_2O\rightarrow 3Ca(OH)_2+2PH_3[/tex]

Podemos calcular la masa máxima de cualquier producto, digamos PH3, al comparar la masa de este, que 2 g the Ca3P2 y 1 g de H2O producen por separado y de acuerdo a la estequiometría:

[tex]2gCa_3P_2 *\frac{1molCa_3P_2 }{182.18gCa_3P_2 }*\frac{2molPH_3}{1molCa_3P_2 } *\frac{34gPH_3}{1molPH_3 } =0.747gPH_3\\\\1gH_2O *\frac{1molH_2O }{18.02gH_2O}*\frac{2molPH_3}{6molH_2O} *\frac{34gPH_3}{1molPH_3 } =0.629gPH_3[/tex]

De este modo, infermos que solamente 0.629 gramos the PH3 pueden ser obtenidos al ser el agua el reactivo límite.

¡Saludos!

Answer:

5.B 6.A

Explanation:

(sorry if this is short)

Answer:

C. Rockets need only upward thrust as a force for flight.

Explanation:

This is correct

Answer:

c

Explanation:

Answer:

Barium

Explanation:

The specific heat of a material is a property defined as the amount of energy required to increase the temperature of 1g of this material in 1°C = 1K

In this way, the metal that takes the least amount of energy to increase its temperature is the metal that has the lowest specific heat.

In the problem, this metal is Barium (Ba = 0.201J/gK)

Answer:

Given,

P1=760 torr

T1=21°C

T2=250°C

P2=?

Solution,

According to Gay-Lussac's Law or Third Gas Law,

P1T2=P2T1

760×250=21×P2

P2=9047 torr

9047 is the pressure of the gas at 250 degree Celsius.

Answer:

9,047.62 torr

Explanation:

The given parameters are pressure (P1) = 760 torr, Temperature at which the gas exerts pressure, P1, called the initial temperature (T1) = 21-celsius degrees, a second temperature(T2) = 250 Celsius degrees, and the pressure(P2) which such gas would exert at T2 is unknown [P2=?]. Notice that the temperature difference.

Gay Lussac's Law states that the pressure of a given amount of gas held at constant volume is directly proportional to the kelvin temperature.

If you heat a gas, the molecule gains kinetic energy and they move about in their container. As the temperature increase, the energy each particle gains would increase as well. Thus, allowing them to move faster and in all directions. Because they are confined to the boundary of the container, the gas particles bounce off the wall of the container. The energy allows continuous movement of the particle. Hence, the pressure each particle would exert on the wall of the container is equal to its momentum. Remember that the velocity, V, a particle is traveling with is promotional to the energy, E, that it obtains from the increase in temperature.

Using the Gay Lussac's Law equation: P1T2=P2T1 [Notice here that P=T].

Making P2 the mathematical subject, P2= P1T2/T1. ----Formula for the condition of this problem.

Substituting the known values;

P2= (760 torr x 250°C)/ 21 °C

P2= (190,000 °C torr)/21 °C

Cancel like terms in the numerator and denominator.

P2= (190,000 torr)/21

P2= 9,047.62 torr

[Notice that the pressure increase with the increase in temperature. The pressure increase from 760 torr to 9,047.62 torr with an increase in temperature from 21 Celsius degrees to 250 Celsius degrees.]

i thank its B my big brother helped me we thank its b

Answer:

[tex]\boxed {\boxed {\sf 146 \ g \ NaNO_3}}[/tex]

Explanation:

To convert from moles to mass, the molar mass is used. This tells us the grams in 1 mole of a substance.

We know the compound is sodium nitrate.

Sodium has an oxidation state of +1 and nitrate's is -1. When they bond, sodium gives an electron to nitrate and the charges balance out. We don't need to add any additional subscripts.

The molar mass is found on the Periodic Table. It is the same as the atomic mass, but the units are grams per mole. Look up the values for the individual elements.

Notice that in the formula, oxygen has a subscript of 3. We must multiply oxygen's molar mass by 3 before adding the other molar masses.

Use the molar mass as a ratio.

[tex]\frac {84.9937693 \ g \ NaNO_3}{1 \ mol \ NaNO_3}[/tex]

Multiply by the given number of moles: 1.72

[tex]1.72 \ mol \ NaNO_3 *\frac {84.9937693 \ g \ NaNO_3}{1 \ mol \ NaNO_3}[/tex]

The units of moles of sodium nitrate cancel.

[tex]1.72*\frac {84.9937693 \ g \ NaNO_3}{1}[/tex]

[tex]146.1892832 \ g \ NaNO_3[/tex]

The original measurement of moles has 3 significant figures, so our answer must have the same. For the number we found, that is the ones place.

The 1 in the tenths place tells us to leave the 6.

[tex]146 \ g \ NaNO_3[/tex]

1.72 moles of sodium nitrate has a mass of approximately 146 grams.