T1 - Chemical/Physical Properties Flashcards

1
Q

Four states of matter

A

solid, liquid, gas and plasma

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2
Q

Matter is

A

a term used to describe all objects inthe universe.

It is defined as anything that has mass and takes up space

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3
Q

What are the and examples of combinations of substances ?

A

Example 1: Styrofoam is a solid plastic with trapped air.

Example 2: Bubbles in a bubble bath are liquid films of soap with trapped air inside.

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4
Q

What is a pure substance ? What its unique properties ?

A
  • A pure substance is made of only one kind of particle.
  • It has a unique set of properties, such as colour, hardness, constant boiling point and melting point
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5
Q

What are elements? Ex ?

A

Elements are made of one type of particle and cannot be broken down into simpler substances.
Examples: Gold, oxygen, iron.

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6
Q

What are compounds? Ex ?

A

Compounds are made from two or more elements chemically combined.
Examples: Water (H₂O), carbon dioxide (CO₂), salt (NaCl).

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7
Q

What is a mixture?

A

A mixture is a combination of pure substances that do not combine chemically. The substances remain in their original form.

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8
Q

There are 4 types

Types of mixtures

A

Mechanical, Suspension, Solution and Colloids

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9
Q

What are mechanical mixtures? Ex ?

A

The substances in a mechanical mixture are visible. These mixtures are heterogeneous.
Examples: Soil, chocolate chip cookies.

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10
Q

What are suspensions? Ex ?

A

Tiny particles of one substance are held within another to form a cloudy mixture. The particles can be separated through filtration. Suspensions are heterogeneous mixtures.
Example: Tomato juice.

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11
Q

What are solutions? Ex ?

A

The substances in a solution are not individually visible. One substance is dissolved in another. Solutions are homogeneous mixtures.
Examples: Tea, sugar in coffee, vinegar.

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12
Q

What are colloids? Ex ?

A

Colloids are similar to suspensions, but the suspended particles cannot be easily separated.
Examples: Shaving cream, smoke.

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13
Q

What is the definition of a physical property?

A

A physical property is a characteristic of a substance that can be observed or measured without changing its composition.

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14
Q

What are some examples of physical properties?

Name at list 4

A
  • Colour
  • Melting/freezing point
  • Density
  • Solubility
  • Ductility (ability to stretch)
  • Boiling/condensation point
  • Conductivity
  • Malleability (ability to be beaten into sheets)
  • Crystal formation
  • Magnetism
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15
Q

What is the definition of a chemical property?

A

A chemical property is a characteristic that describes how a substance reacts when it changes into a new substance.

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16
Q

What causes a chemical change to occur?

A

Chemical changes can occur when a substance interacts with other substances or when exposed to heat or light.

17
Q

What are some examples of chemical properties?

Name at least 3

A
  • Behaviour in air
  • Combustibility
  • Reaction to heat
  • Behaviour in water
  • Flash point
  • Reaction with acids
  • Reaction to red/blue litmus paper
18
Q

What is a physical change?

A
  • A physical change affects the form of a substance but does not change its chemical composition.
  • Physical changes often involve a change in physical properties.
19
Q

Can physical changes be reversed?

A

Yes, physical changes can often be reversed.

20
Q

What are examples of physical changes?

Name at least 3

A
  • Melting
  • Transition to a gas
  • Freezing of a liquid
  • Change in shape
  • Change in size
  • Change in volume
21
Q

What is a chemical change?

A

A chemical change always results in the formation of a new substance with different properties.

22
Q

What are the indicators of a chemical change?

Name at least 2

A
  • Energy is released or absorbed
  • Colour change occurs
  • Bubbles of gas are formed
  • Precipitate (solid) forms in a liquid
  • The change is often difficult to reverse