Again I am here with privious question


I have post this question last time also but no one answers. So can you solve this. I need it.

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Explanation:

a process for separating minerals from gangue by taking advantage of the differences in their hydrophobicity.

I believe that is accurate

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Answer: nHCl = 12/36,5= 0,38(mol)

nZn = 6,5/65 = 0,1(mol)

Ta có pt: Zn + 2HCl --> ZnCl2 + H2

Vì 2n Zn = 0,2 < n HCl = 0,38 nên HCl dư

Theo PTHH :

n H2 = n Zn = 0,1(mol)

V H2 = 0,1.22,4 = 2,24(lít)

Explanation:

Answer:

if wrong sorry ok????

Answer:

The four characrteristics of warm blooded animals are÷

Explanation:

i=They can keep its body temperature the same no matter what the outside temperature .

ii=They can maintain a constant body temperature.

iii=They obtain energy from food consumption.

iv=They maintain their body temperature higher than environment.

Answer:

i) Their body temperature remain constant in any climate.

ii) They obtain energy from food consumption

I only know this much:)

Answer:

B. False

Explanation:

step by step explanation

Answer:

False

Explanation:

Answer:

(A) Amine

Explanation:

Ch3Ch2Nh2 is an Amine.

An amine is often a functional group with a lone pair on the nitrogen atom. Amines structurally mimic ammonia, where nitrogen can link with up to three hydrogen atoms. Here the correct option is A.

Amines are organic substances that have a lone pair of nitrogen atoms in them. In essence, they are produced by replacing one or more hydrogen atoms in ammonia (NH₃) with an alkyl or aryl group, giving them the names alkylamines and arylamines, respectively.

In addition to medicines and treatments, amines are used to create nylon and azodyes. They are frequently employed in the creation of compounds for the filtration of water, and medicinal, and crop protection.

Thus the correct option is A.

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Pulp

distillation

chromatography

Acetone is captured and cooled.

Substance A is rice, and substance B is sugar.

To separate the components of a mixture the substances to be separated must differ in a given physical property.

In chemistry, there are diverse separation techniques used to separate the components of a mixture. Separation depends on differences in a given physical property such as boiling point, solubility in a solvent, difference in particle size etc.

Filtration can be used to separate a solid from a liquid hence it can be used to separate pulp from orange juice.

To separate water and alcohol, distillation is used because such a separation depends on the difference in the boiling points of water and alcohol. Water boils at a higher temperature than alcohol hence the mixture can be separated by distillation.

Chromatography is a method of separation that is dependent on how quickly a the components of a  mixture move through a stationary phase.

Acetone has a lower boiling point than water hence it collected first and cooled before water.

Clearly, substance A must be a solid since it is filtered out after adding water. Substance B must be a water soluble substance which can be recovered from water by evaporation to dryness. Hence substance A is rice, and substance B is sugar.

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Answer: i dont know but yu got it

Explanation:

The balanced equation for the chemical equation given in the question above is: 2Cr(s) + 3Cl₂(aq) → 2CrCl₃(s)

The following data were obtained from the question:

Chemical equations are generally balanced by ensuring that the number of atoms of each element present on both sides of the equation are equal.

Now, we shall balance the equation given from the question as follow:

Cr(s) + Cl₂(aq) → CrCl₃(s)

There are 2 atoms of Cl on the left side and 3 atoms on the right side. It can be balanced by writing 2 before CrCl₃ and 3 before Cl₂ as shown below:

Cr(s) + 3Cl₂(aq) → 2CrCl₃(s)

There are 2 atoms of Cr on the right side and 1 atom on the left side. It can be balanced by writing 2 before Cr as shown below:

2Cr(s) + 3Cl₂(aq) → 2CrCl₃(s)

Thus, the equation is balanced.

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Explanation:

it would have been easier and faster to just look it up on the internet.

this is like in the computer world too (for storage and memory sizes) .

we typically use "kilo", "mega", "giga", "tera", ... to express large quantities.

kilo means 1000

mega means million (1000000)

giga means billion (1000000000)

and so on

so, 5 MW are 5 million Watts. or 5000000 Watts.

Answer:

The correct choice is option C) The reactant that runs out first and limits how much product can be made

Explanation:

The limiting reactant is a reactant in a chemical reaction that gets consumed first and thus limits how much product can be formed.

Answer:

The reactant that runs out first and limits how much product can be made

Explanation:

Answer:

These are compounds.

Explanation:

As it is formed by chemically bonding of two elements C ( carbon) and H (hydrogen) .

Answer:

Butane and benzene are both compounds. They contain multiple elements bonded together in a specific ratio. Kerosene and gasoline are mixtures because they are combinations of several compounds. Oxygen is an element because it is made up of only one type of atom.

Explanation:

Answer:Water contains Oxygen the purified the methane gas

Explanation:

Answer:

write in English bro? can you?

Explanation:

I can't understand your language sorry .

Explanation:

Answer:

A cell wall is a fairly rigid layer surrounding a cell located outside of the plasma membrane that provides additional support and protection. They are found in bacteria, archaea, fungi, plants, and algae. Animals and most other protists have cell membranes without surrounding cell walls.

Explanation:

Answer:

337.5kPa ~ 338kPa

Explanation:

Using the ideal gas law PV=nRT we have the following definitions from the problem:

V(initial) = 20cm³

P(initial) = ?kPa

V(final) = 75cm³

P(final) = 90kPa

Since we know that the number of moles of the sample did not change, nor did the temperature, nor does the ideal gas constant (R) we can rewrite this equation to state:

P(initial)V(initial) = nRT =P(final)V(final) ~  P(initial)V(initial) = P(final)V(final)

Rearranging this equation as we are solving for the initial pressure we find that:

P(initial) = (P(final)V(final))/V(initial)

P(initial) = ((90kPa)(75cm³))/20cm³

P(initial) = 337.5kPa ~ 338kPA

Answer:

the number of crickets in each container

Explanation:

to participate in the experiment you will have to know the crickets in the container

Answer:

for this question i think the answer is 1.35 atm

Las diferencias entre el consumo de agua existen debido a que varios factores externos inciden en este proceso de ingesta de agua.

El agua es un compuesto químico que es vital para la vida de los seres vivos. En el caso de los humanos es necesario tomar agua para evitar la deshidratación y activar muchos procesos naturales del cuerpo.

La cantidad de agua que debe tomar un humano depende de varios factores como:

Incluso la cantidad de agua de agua puede variar dependiendo del peso de cada persona, aquellas personas que pesan más deben beber más agua, que aquellas que tienen menor peso debido a que la cantidad de agua debe ser proporcional a su peso.

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[tex]\\ \rm\Rrightarrow Sodium\:Hydrogen\:carbonate=NaHCO_3[/tex]

[tex]\\ \rm\Rrightarrow Calcium\:Hydroxide=Ca(OH)_2[/tex]

[tex]\\ \rm\Rrightarrow Silver\:Nitrate=Ag(NO_3)_2[/tex]

[tex]\\ \rm\Rrightarrow Ammonium\:Sulphate=(NH_4)_2SO_4[/tex]

[tex]\\ \rm\Rrightarrow Ferric\:oxide=Fe_2O_3[/tex]

Answer:

Volcanic eruptions release gases into the air.

Explanation:

This is because the atmosphere collects the gas from the volcano, the volcano is apart of the geosphere because it is a part of the earth's surfaces.

Answer:

the correct answer is option ( A )

Both A and R are true and R is the correct explanation of A.

Explanation:

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Answer:1) It is due to large cohesive force acting between the molecules of mercury that the droplets of mercury when brought in contact pulled together to form a bigger drop in order to make potential energy minimum. The temperature of this bigger drop increases since the total surface area decreases.  

2) A spherical shape has the minimum surface area to volume ratio of all geometric forms. When two drops of a liquid are brought in contact, the cohesive forces between their molecules coalesce the drops into a single larger drop. This is because, the volume of the liquid remaining the same, the surface area of the resulting single drop is less than the combined surface area of the smaller drops. The resulting decrease in surface energy is released into the environment as heat.  

Answer:

D

Explanation:

water changes

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According to the phase diagram for H[tex]_2[/tex]O, Water changes from a solid to a gas to a liquid at  at 1 atm pressure as the temperature is increased from-10°C to 110°C. Thus, the correct option is option D.

A phase diagram is a type of graph used to display the conditions during which thermochemical distinct phases occur as well as coexist at equilibrium in physical chemistry, technology, mineralogy, as well as materials science.

Phase changes take place along equilibration lines. According to the phase diagram for H[tex]_2[/tex]O, Water changes from a solid to a gas to a liquid at  at 1 atm pressure as the temperature is increased from-10°C to 110°C.

Therefore, the correct option is option D.

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The correct statement that describes the relationship between thermal energy and particle movement is "As thermal energy increases, there is more particle movement".

WHAT IS THERMAL ENERGY?

Hence, as thermal energy of substance increases, there is more particle movement of that substance.

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Solution:-1

[tex]\\ \sf\longmapsto E=hv[/tex]

Solution:-2

[tex]\boxed{\sf \lambda=\dfrac{c}{v}}[/tex]

[tex]\\ \sf\longmapsto v=\dfrac{c}{\lambda}[/tex]

[tex]\\ \sf\longmapsto v=\dfrac{3\times 10^8m/s}{3000\times 10^{-10}m}[/tex]

[tex]\\ \sf\longmapsto v=0.001\times 10^{18}s^{-1}[/tex]

[tex]\\ \sf\longmapsto v=1.0\times 10^{15}s^{-1}[/tex]

Now

[tex]\\ \sf\longmapsto E=hv[/tex]

[tex]\\ \sf\longmapsto E=6.626\times 10^{-34}Js\times 1.0\times 10^{15}s^{-1}[/tex]

[tex]\\ \sf\longmapsto E=6.6\times 10^{-19}J[/tex]

Force = The external energy that changes or tends to change the state of any body or object is called force.

Speed = The rate of distance is called speed.

Answer:

Force is a push or pull which changes or tend to change the position of a body.

The rate of change its position with time or magnitude is called speed.