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hoa [83]
3 years ago
6

What is the volume of a salt crystal measuring 5.44 x 10-2m by 2.5 x10-3m by 7.9 x 10-3 m?

Chemistry
1 answer:
vivado [14]3 years ago
4 0
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What is the relative rate of diffusion of hydrogen and nitrogen ​
vredina [299]

Answer:

2.645

Explanation:

Rate of diffusion formula:

Sqrt(mass2/mass1)

>>sqrt(14/2)

(Note:Hydrogen must exist in dwiatomic, [H2])

3 0
2 years ago
If 12.5 grams of strontium hydroxide is reacted with 150 mL of 3.5 M carbonic acid, identify the limiting reactant.
vesna_86 [32]

Answer:

Sr(OH)2

Explanation:

We'll begin by calculating the number of mole of carbonic acid in 150mL of 3.5 M carbonic acid solution. This is illustrated below:

Molarity = 3.5M

Volume = 150mL = 150/1000 = 0.15L

Mole of carbonic acid, H2CO3 =..?

Mole = Molarity x Volume

Mole of carbonic acid, H2CO3 = 3.5 x 0.15 = 0.525 mole.

Next, we shall convert 0.525 mole of carbonic acid, H2CO3 to grams.

Mole of H2CO3 = 0.525 mole

Molar mass of H2CO3 = (2x1) + 12 + (16x3) = 62g/mol.

Mass of H2CO3 =..?

Mass = mole x molar mass

Mass of H2CO3 = 0.525 x 62 = 32.55g

Next, we shall write the balanced equation for the reaction. This is given below:

Sr(OH)2 + H2CO3 → SrCO3 + 2H2O

Next, we shall determine the mass of Sr(OH)2 and H2CO3 that reacted from the balanced equation. This is illustrated below:

Molar mass of Sr(OH)2 = 88 + 2(16 + 1) = 88 + 2(17) = 122g/mol

Mass of Sr(OH)2 from the balanced equation = 1 x 122 = 122g

Molar mass of H2CO3 = (2x1) + 12 + (16x3) = 62g/mol.

Mass of H2CO3 from the balanced equation = 1 x 62 = 62g.

From the balanced equation above, 122g of Sr(OH)2 reacted with 62g of H2CO3.

Finally, we shall determine the limiting reactant as follow:

From the balanced equation above, 122g of Sr(OH)2 reacted with 62g of H2CO3.

Therefore, 12.5g of Sr(OH)2 will react with = (12.5 x 62)/122 = 6.35g.

We can see evidently from the calculations made above that it will take 6.35g out 32.55g of H2CO3 to react with 12.5g of Sr(OH)2. Therefore, Sr(OH)2 is the limiting reactant and H2CO3 is the excess reactant

5 0
3 years ago
Read 2 more answers
Which of the following is the method that incorporates designing sustainable living environments with agriculture?
sergey [27]

Answer:

what are the answers?????????

8 0
3 years ago
4.1 shows a plant cell. g For Examiner's Use n. C D Fig. 4.1 (i) Name the type of plant cell shown in Fig. 4.1. [1]​
Vinil7 [7]

Answer:

palisade cell due to presence of chloroplasts

7 0
3 years ago
HELP i need the answer to this science question:
S_A_V [24]

Answer:

1. Convection: c. Transfer of energy by movement of matter.

2. Radiation: e. Transfer of energy by waves, often through empty space.

3. Thermal Energy: a. The total energy an object has. The more stuff you have the higher this will be.

4. Conduction: d. Transfer of energy by contact between two things.

5. Heat: b. Any transfer of thermal energy

______________________

<h2>Explanation(s):</h2>

<u>Explanation of #1</u>:

Convection is one of the three ways thermal energy is transferred. Convection is usually defined as the transfer of heat by the circulation or movement of the heated parts of a liquid or gas. An example of convection on earth is convection currents. Convection currents are the movement of fluid as a result of differential heating or convection. In the case of the Earth, convection currents refer to the motion of molten rock in the mantle as radioactive decay heats up magma, causing it to rise and riving the global-scale flow of magma.

<u>Explanation for #2:</u>

Electromagnetic waves are waves produced the acceleration of an electric charge and propagated by the periodic variation of intensities of, usually, perpendicular electric and magnetic fields. This transfer of energy by waves is known as radiation. Or in other words, this kind of transfer is done through the propagation of electromagnetic waves, that carry energy, without need of a material medium, in empty space. Radiation is usually defined as the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and absorbed by another body.

<u>Explanation for #3</u>:

Thermal energy can be defined in 3 different ways. First, it can be defined as the internal energy of a system in thermodynamic equilibrium due to its temperature. Second, A form of energy; sensible energy; heat. Third and last, the energy released by an explosion. Thermal energy is produced through the movement of particles within a system or object, it can be referred to as kinetic energy. Kinetic energy is usually defined as the energy of a body or a system with respect to the motion of the body or of the particles in the system.

<u>Explanation of #4</u>:

Conduction is usually defined as the transfer of heat between two parts of a stationary system, caused by a temperature difference between the parts.  Conduction is the transfer of heat through direct touch of molecules. Conduction is the transfer of thermal energy with no transfer of manner. It occurs when two materials touch. The heat movement in conduction is within and via the body itself. In contrast, heat transmission through thermal radiation frequently occurs between entities that are geographically separated. Heat can also be transferred by a mix of conduction and thermal radiation.

<u>Explanation of #5</u>:

As a noun, heat is usually defined as the state of a body perceived as having or generating a relatively high degree of warmth. There are 3 types of ways heat can be transferred which is via conduction, convection, or radiation. Heat produces thermal energy which is transmission through these 3 different processes. Thermal energy is the internal energy of a system in thermodynamic equilibrium due to it's temperature. Thermal energy is produced through heat and is transmission through the 3 processes in different ways (mentioned above obviously).

___________

<h3>additional comment:</h3>

Definitions:

Radiation is simply the energy that is emitted by a body that has energy. Even human beings radiate energy (infra red radiation).

Convection is the transfer of heat through fluid (liquid or gas). It probably relates to astronomy in that due to gravity, a star's core is much hotter than the rest of it. The heated plasma rises to the surface like boiling water, where the heat is absorbed by the surrounding plasma through convection , then it cools and sinks down to the core again.

In the atmosphere conduction is the transfer of heat by direct contact. The best example would be the heating of the atmosphere that is directly in contact with the Earth (first few feet).

On a particle level this is energy transferred by the particles colliding with and passing energy into adjacent particles.

5 0
2 years ago
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