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3 years ago

How do particles in matter change when a substance becomes hotter, cools down, or changes state?

Chemistry

1 answer:

FinnZ [79.3K]3 years ago

7 0

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When a substance becomes hotter or cooler or change in state due to external change in energy, few changes takes place like:

Change in Interparticular force of attraction.
Change in distance between voids.

When Energy is supplied:

A substance becomes more hot and changes it state i.e. Solid to liquid, or liquid to gas in normal conditions.

External energy is supplied.
Average kinetic energy increases.
The particles gets excited.
They start moving farther increasing their Interparticular force of attraction.
They makes some changes in shape & volume.

When Energy is taken away:

A substance becomes colder and changes it state i.e. gas to liquid, or liquid to solid in normal conditions.

Energy is taken away from the matter.
Average kinetic energy decreases.
The particles move closer to each other.
The Interparticular force of attraction now increases because they are near to each other.
This increases the density and make it compact.

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How does salt help melt the road?

QveST [7]

Lower the melting point

Explanation:

Salts helps to melt road by lowering the melting point. It acts as an impurity and generally, impurities low the melting point of substances.

Salts are used as an antifreeze.

Water freezes at 0°C and forms ice/snow which can impede human and vehicular movement.
When salt is added, it causes the depression of the freezing point by lowering it further.
The freezing point is pegged back at -6°C.
This way it takes more low temperature to freeze the water.
The salt acts as an impurity and causes the depression of melting point and widening of the melting range.

learn more:

Matter brainly.com/question/10972073

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4 years ago

Read 2 more answers

A solution containing CaCl2 is mixed with a solution of Li2C2O4 to form a solution that is 3.5 × 10-4 M in calcium ion and 2.33

Burka [1]

Answer:

B. A precipitate will form since Q > Ksp for calcium oxalate

Explanation:

Ksp of CaC₂O₄ is:

CaC₂O₄(s) ⇄ Ca²⁺ + C₂O₄²⁻

Where Ksp is defined as the product of concentrations of Ca²⁺ and C₂O₄²⁻ in equilibrium:

Ksp = [Ca²⁺][C₂O₄²⁻] = 2.27x10⁻⁹

In the solution, the concentration of calcium ion is 3.5x10⁻⁴M and concentration of oxalate ion is 2.33x10⁻⁴M.

Replacing in Ksp formula:

[3.5x10⁻⁴M][2.33x10⁻⁴M] = 8.155x10⁻⁸. This value is reaction quotient, Q.

If Q is higher than Ksp, the ions will produce the precipitate CaC₂O₄ until [Ca²⁺][C₂O₄²⁻] = Ksp.

Thus, right answer is:

B. A precipitate will form since Q > Ksp for calcium oxalate

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3 years ago

The ___________ of the glass of water on the table is its force. A) Mass B) Weight

kirill115 [55]

B.) Weight.

Weight is the combination of gravity on mass, thus it produces a force. (gravity is the force)

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3 years ago

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Explain ways that organisms interact in helpful and harmful ways.

I am Lyosha [343]

Organisms are living things. Us humans are also living things, so we are helpful and harmful to other organisms. For example: we can help another human being with something, or we can help a plant/tree grow if we water it. In return, they also help us by providing us with oxygen. however, we can also be harmful to each other and the environment, for example: we can't hurt each other, or plant or animals by killing them or we can hurt insects by stepping on them. Therefore, organisms are helpful and harmful to each other.

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3 years ago

The movement of one or more from one reactant to another is called

mrs_skeptik [129]

Answer: Redox Reaction

Explanation:

Redox reaction is the key chemical events in an oxidation-reduction also called Redox. It is the net movement of electrons from one reactants to another

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3 years ago