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MARY > Science Chapter 2 and 3 > Flashcards

Science Chapter 2 and 3 Flashcards

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1
Q

It refers to the amount of matter.

A

mass

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2
Q

True or False: Matter has mass?

A

TRUE

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3
Q

The space occupied by an object is called?

A

volume

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4
Q

The product of the length, width and height of the object, it is expressed in cubic centimer (cm3) or cubic meter (m3) is called?

A

volume

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5
Q

Used to measure the volume of liquids?

A

graduated cylinder

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6
Q

The surface of a liquid in a graduated cylinder is curved, this curve is called?

A

meniscus

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7
Q

The line that corresponds to the meniscus is the?

A

volume of the liquid.

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8
Q

How to determine the volume of a regular object like a box?

A

measure the length of all the sides

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9
Q

How to determine the volume of a irregular objects, like a ring or stone?

A

by water displacement

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10
Q

It describes the amount of particles of matter in a specific space an object takes up?

A

Density

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11
Q

Why does ice float on water?

A

Ice is less dense than water, hence it will float.

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12
Q

Density Formula

A

D = M / V (check your book)

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13
Q

The ability of a liquid to move through a tube (solid). It is caused by the attraction between the liquid molecules and the solid molecules.

A

Capillarity

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14
Q

A process of taking up liquids through minute pores of a substance.

A

Absorption

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15
Q

Materials that absorb liquids are called?

A

absorbent materials

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16
Q

Give 3 examples of absorbent materials?

A

tissue, towel or cloth, paper

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17
Q

Materials that do not absorb liquid are called?

A

nonabsorbent material

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18
Q

Give 3 examples of nonabsorbent materials?

A

cup, saucer, plastic or ceramic basins

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19
Q

Materials that will decay and give a bad smell, and also help make the soil fertile are called?

A

biodegradable materials

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20
Q

Are organisms that cause biodegradable materials to decay, break down biodegradable waste are called?

A

decomposers

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21
Q

Materials that will not decay at all or some it takes a very long time to decay are called?

A

nonbiodegradable materials

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22
Q

True or False: Nonbiodegradable materials may become toxic and may cause pollution if not properly stored or disposed of?

A

True

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23
Q

Review the Decaying time of Materials

A

Page 46 of your book!

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24
Q

True or False: The process of decay is caused by bacteria and fungi?

A

True

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25
True or False: The decay or decomposition process produces bad odor and certain gases, including ammonia and hydrogen sulfide.
True
26
Happens when you eat spoiled food. It may cause vomiting, stomach pain, cramps or diarrhea. It may even cause death.
Food poisoning
27
What are the diseases that rats, cockroaches and mosquitoes carry when decaying wastes are not properly disposed?
leptospirosis, dengue and malaria
28
Give me 8 ways on controlling decay?
Drying, Refrigeration or Freezing, Vacuum packing, Salting or Curing, Smoking, Preservatives, Pickling , Canning
29
One of the most popular food preservation techniques. This reduces water activity to prevent the growth of molds and bacteria.
Drying
30
Freezing preserves food by slowing down the growth of orgranisms which cause food to decay.
Refrigeration
31
Stores food in an airtight bag or bottle? It removes oxygen, which the bacteria need to grow, thus slowing down the process of spoilage.
Vacuum packing
32
Removes moisture from the meat, and it is cured with salt or sugar.
Salting or curing
33
Used for perishable food items like fish. It lengthens the shelf life of food items.
Smoking
34
The amount of time a material may be stored without becoming unfit for consumption.
Shelf life
35
Are food additives that do not allow the growth of bacteria or mold.
Preservatives
36
Example of a preservative like salitre?
nitrates
37
Is a method of preserving food in an edible liquid that inhibits or kills bacteria and other microorganisms.
Pickling
38
Involves sealing foods in sterile cans or jars and boiling the cans to kill or weaken any remaining bacteria.
Canning
39
Things you do not need may be classified as?
waste
40
Things you do not use are classified as?
unused
41
Some people buy extra things as reserve like a pair of sneakers are called?
spare
42
How do you practice Zero Waste Management?
Recycle and reuse materials.
43
True or False: To keep the environment clean, waste materials must be properly disposed of?
True
44
Is a natural process that breaks down organic materials into reusable resource.
composting
45
When a material changes only in size, shape, and form, the material undergoes _________.
physical change
46
When a material involves a change in properties like color, odor, taste and resulted in a new material. Such change is called?
chemical change
47
True or False: Physical change may also be a change in the phase of matter.
True
48
The process of changing a solid into a liquid is called?
melting
49
The process of changing a liquid into a gas is called?
evaporation
50
The process of changing a gas into a liquid is called?
condensation
51
The process of changing liquid into a solid is called?
freezing
52
A solid changes directly to gas. It does not pass through the liquid state. This process is called?
sublimation
53
The particles of gas move freely and rapidly and can directly change into solid particles is called? The opposite of sublimation.
deposition
54
Fire extinguisher, filled with gaseous carbon dioxide that releases a white powder is an example of?
deposition
55
True or False: A chemical change occurs when a new substance with properties different from the original substance is formed.
True
56
True or False: The properties of matter chnages when there is change in temperature.
True
57
Describes how hot or cold an object is.
Temperature
58
Used to measure temperature.
Thermometer
59
Is a combination of two or more substances.
Mixture
60
True or False: Sometimes, mixing tow or more materials together results in a chemical reaction.
True
61
A chemical process by the plant that converts the sun's light and heat energy to chemical energy.
Photosynthesis
62
Is decaying food an example of a harmful chemical change? Yes or No.
Yes

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