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3 years ago

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Chemistry

2 answers:

Alenkasestr [34]3 years ago

3 0

Answer : As I understand this is question of matching the correct pairs.
So here are the correct pairs.

1) The attraction between molecules at the surface of a liquid column

---->Surface tension

Surface tension is a phenomenon observed at the <span>surface film of a liquid which is usually caused by the attraction of the particles on the surface layer by the bulk moiety of the liquid, and which tends to minimize its surface area.</span>

2) The energy of motion

----> Kinetic energy

Kinetic energy is the energy which is possessed by an object due to motion.

3) The movement of liquids through the spaces of materials

----> Capillary action

Capillary action is defined as<span> the ability of any liquid to flow through the narrow spaces without any of the assistance, or even in opposition to, external force like gravitational force.</span>

4) The overall movement of suspended or dissolved particles resulting from the random movements of individual particles

----> Diffusion

Diffusion in liquids can be defined as the random movement of particles which are dissolved or are in suspended state in liquid.

5) Attraction of one particle in a material for another

----> Cohesion

Cohesion is defined as the attraction between two different particles in a state of matter

6) The attraction between unlike substances

----> Adhesion

Adhesion is a property of attraction between two unlike substances.

7) A measure oof the resistance of a liquid to flow

----> Viscosity

Viscosity is the term used to define as the resistivity of liquid to flow.

shepuryov [24]3 years ago

3 0

Answer:

We can match the closest meaning with the definition of each term as follows:

1) Attraction between molecules at the surface of a liquid column -> Surface Tension

2) The energy of motion -> Kinetic Energy

3) The movement of liquids through the spaces of materials ->Capillary action

4) The overall movement of suspended or dissolved particles resulting from the random movements of individual particles -> Diffusion.

5) Attraction of one particle in a material for another -> Cohesion,

6) The attraction between unlike substances -> Adhesion

7) A measure oof the resistance of a liquid to flow -> Viscosity

Explanation:

We have seven definitions and seven terms. we have to match them using the adequate definition. The first step is to describe briefly each word. After that, we can match them.

Surface Tension: Surface tension is a phenomenon observed at the surface film of a liquid.

Kinetic Energy: Energy caused mainly due to the velocity.

Capillary action: the ability of any liquid to flow through the narrow spaces.

Diffusion: random movements inside fluids.

Cohesion: the attraction between two particles in different materials.

Adhesion: the attraction between two, unlike materials.

Viscosity: Tem which measures the resistance of fluid material to flow.

Now, we can match the closest meaning with the definition of each term as follows:

1) Attraction between molecules at the surface of a liquid column -> Surface Tension

2) The energy of motion -> Kinetic Energy

3) The movement of liquids through the spaces of materials ->Capillary action

4) The overall movement of suspended or dissolved particles resulting from the random movements of individual particles -> Diffusion.

5) Attraction of one particle in a material for another -> Cohesion,

6) The attraction between unlike substances -> Adhesion

7) A measure oof the resistance of a liquid to flow -> Viscosity

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The volume of ethyne, C₂H₂ required to produce 12 moles of CO₂ assuming the reaction is at STP is 134.4 L

<h3>Balanced equation</h3>

2C₂H₂(g) + 5O₂(g) --> 4CO₂(g) + 2H₂O(g)

From the balanced equation above,

4 moles of CO₂ were produced by 2 moles of C₂H₂

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From the balanced equation above,

4 moles of CO₂ were produced by 2 moles of C₂H₂

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At standard temperature and pressure (STP),

1 mole of C₂H₂ = 22.4 L

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STatiana [176]

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The sum of first 30 terms of the arithmetic progression is <u>2160.</u>

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For an arithmetic progression, the sum of first $n$ terms with first term as $a$ and common difference $d$ is given as:

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Now, it is given that:

$For\ n=10,S_n=120\\For\ n=20,S_n=840$

Now, plug in these values and frame two equations in $a\ and\ d$

$S_{10}=\frac{10}{2}(2a+(10-1)d)\\120=5(2a+9d)\\2a+9d=\frac{120}{5}\\2a+9d=24------------1$

$S_{20}=\frac{20}{2}(2a+(20-1)d)\\840=10(2a+19d)\\2a+19d=\frac{840}{10}\\2a+19d=84-----------2$

Now, we solve equations (1) and (2) for $a\ and\ d$ . Subtract equation (1) from equation (2). This gives,

$2a+19d-2a-9d=84-24\\19d-9d=60\\10d=60\\d=\frac{60}{10}=6$

Now, plug in the value of $d=6$ in equation (1) and solve for $a$ .

$2a+9(6)=24\\2a+54=24\\2a=24-54\\2a=-30\\a=\frac{-30}{2}=-15$

Plug in the values of $a=-15,\ n=30\ and\ d=6$ in the sum formula to find the sum of first 30 terms.

Now, the sum of first 30 terms is given as:

$S_{30}=\frac{30}{2}(2(-15)+(30-1)(6))\\S_{30}=15(-30+29(6))\\S_{30}=15(-30+174)\\S_{30}=15(144)=2160$

Therefore, the sum of first 30 terms of the arithmetic progression is 2160.

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