Physical and Chemical Change Flashcards

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1
Q

What is physical change?

A

physical change is being a change in which no new substance is formed.

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2
Q

What is melting?

A

Melting ice is known as a physical change as it only involves a change in the physical state of water, from ice to water in the liquid state.

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3
Q

What is freezing?

A

Freezing of water is a physical change because only the physical state of water is changed; i.e. water is converted into ice.

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4
Q

What is evaporation?

A

The process of change of state from liquid to a gas is ​called evaporation.​ It is a physical change as no new substance is formed. When water evaporates, it changes from liquid state to gas state, ​but it is still the same water H2O chemically.​

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5
Q

what is condensation?

A

Condensation is a physical change. In condensation, a gas turns into a liquid. The molecules of the gas do not change when they turn into the liquid, indicating it is just a physical change.

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6
Q

Examples of changing shape

A

Bending, cutting, twisting.

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7
Q

What is expansion?

A

Inlarging or making bigger

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8
Q

What are some examples of expansion?

A

Water has the unusual property in that it also expands when it freezes. This makes ice float.
Thermal expansion can be anything that is heated so it expands or the opposite cooled so it expands.
Metal expands in the heat.

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9
Q

What is contraction?

A

Thermal contraction, or shrinking of materials, occurs when materials are subjected to a decrease in temperature. It occurs in all types of matter, whether it is solid, liquid, or gas.

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10
Q

What are some examples of contraction?

A

1) snapping of taut power lines during winter; (2) deflation of balloon when placed in ice-cold water; and (3) breakage of an initially hot glass placed under cold running water.

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11
Q

What is changing states?

A

When the matter changes from one state to another.

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12
Q

What are some examples of changing states?

A

Evaporation, melting, freezing, condensation

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13
Q

What is mixing?

A

In chemistry, when two or more substances mix with each other without participating in a chemical change, the resulting substance is called a Mixture. The result formed due to the combination of substances does not lose its individuality nor are they combined chemically.

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14
Q

What are some examples of mixing?

A

Examples include blood, milk, salt and water, sand and water

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15
Q

What are some ways to detect the presence of a new substance?

A

Chemical reactions are also known as chemical changes. There are many different ways to spot a chemical change. Five different signs include odor, temperature change, precipitate formation, production of gas bubbles, and a color change.

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16
Q

What are some examples of colour change that indicate chemical change

A

For example,the rusting of metal over time, the metal has changed color and turned orange. This change in color is evidence of a chemical change.
Vinegar is an acid, so when you poured the indicator solution into the second flask, it turned red.

17
Q

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A
18
Q

What is the structure of solids?

A

Solids are characterized by an extended three-dimensional arrangement of atoms, ions, or molecules in which the components are generally locked into their positions

19
Q

What is the structure of liquid?

A

The structure of liquid molecules is that they are free to move about, but there is some order because they remain relatively close to one another.

20
Q

What is the structure of gas?

A

The structure of gas will consist of a large number of atoms or molecules that have continuous motion in a random fashion.

21
Q

Describe particle behaviour when substances expand and contract.

A

When solids are heated, the vibratory motion of their particles (atoms and molecules) becomes fast and they begin to push each other farther apart. This results into expansion of solids. Similarly, when solids are cooled, particles slow down and solids contract.

22
Q

Explain how melting, freezing, evaporation and condensation can be explained using the particle model

A
  • Freezing is when liquid water freezes into ice cubes.
  • Melting is when those ice cubes melt.
  • Condensation is when dew forms on grass in the morning.
  • Evaporation is when water boils and turns into steam.
  • Boiling is the rapid phase transition from liquid to gas or vapour.
23
Q

Describe the application of the particle theory of matter using everyday examples

A

An example of the particle model of matter in real life is how water can go from a solid to a liquid and then to a gas. If water is cold enough it can become ice, and if it is boiled to a high enough temperature it becomes steam.