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MARY > Science Chapter 2 and 3 > Flashcards

Science Chapter 2 and 3 Flashcards

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
Q

True or False: The decay or decomposition process produces bad odor and certain gases, including ammonia and hydrogen sulfide.

A

True

26
Q

Happens when you eat spoiled food. It may cause vomiting, stomach pain, cramps or diarrhea. It may even cause death.

A

Food poisoning

27
Q

What are the diseases that rats, cockroaches and mosquitoes carry when decaying wastes are not properly disposed?

A

leptospirosis, dengue and malaria

28
Q

Give me 8 ways on controlling decay?

A

Drying, Refrigeration or Freezing, Vacuum packing, Salting or Curing, Smoking, Preservatives, Pickling , Canning

29
Q

One of the most popular food preservation techniques. This reduces water activity to prevent the growth of molds and bacteria.

A

Drying

30
Q

Freezing preserves food by slowing down the growth of orgranisms which cause food to decay.

A

Refrigeration

31
Q

Stores food in an airtight bag or bottle? It removes oxygen, which the bacteria need to grow, thus slowing down the process of spoilage.

A

Vacuum packing

32
Q

Removes moisture from the meat, and it is cured with salt or sugar.

A

Salting or curing

33
Q

Used for perishable food items like fish. It lengthens the shelf life of food items.

A

Smoking

34
Q

The amount of time a material may be stored without becoming unfit for consumption.

A

Shelf life

35
Q

Are food additives that do not allow the growth of bacteria or mold.

A

Preservatives

36
Q

Example of a preservative like salitre?

A

nitrates

37
Q

Is a method of preserving food in an edible liquid that inhibits or kills bacteria and other microorganisms.

A

Pickling

38
Q

Involves sealing foods in sterile cans or jars and boiling the cans to kill or weaken any remaining bacteria.

A

Canning

39
Q

Things you do not need may be classified as?

A

waste

40
Q

Things you do not use are classified as?

A

unused

41
Q

Some people buy extra things as reserve like a pair of sneakers are called?

A

spare

42
Q

How do you practice Zero Waste Management?

A

Recycle and reuse materials.

43
Q

True or False: To keep the environment clean, waste materials must be properly disposed of?

A

True

44
Q

Is a natural process that breaks down organic materials into reusable resource.

A

composting

45
Q

When a material changes only in size, shape, and form, the material undergoes _________.

A

physical change

46
Q

When a material involves a change in properties like color, odor, taste and resulted in a new material. Such change is called?

A

chemical change

47
Q

True or False: Physical change may also be a change in the phase of matter.

A

True

48
Q

The process of changing a solid into a liquid is called?

A

melting

49
Q

The process of changing a liquid into a gas is called?

A

evaporation

50
Q

The process of changing a gas into a liquid is called?

A

condensation

51
Q

The process of changing liquid into a solid is called?

A

freezing

52
Q

A solid changes directly to gas. It does not pass through the liquid state. This process is called?

A

sublimation

53
Q

The particles of gas move freely and rapidly and can directly change into solid particles is called? The opposite of sublimation.

A

deposition

54
Q

Fire extinguisher, filled with gaseous carbon dioxide that releases a white powder is an example of?

A

deposition

55
Q

True or False: A chemical change occurs when a new substance with properties different from the original substance is formed.

A

True

56
Q

True or False: The properties of matter chnages when there is change in temperature.

A

True

57
Q

Describes how hot or cold an object is.

A

Temperature

58
Q

Used to measure temperature.

A

Thermometer

59
Q

Is a combination of two or more substances.

A

Mixture

60
Q

True or False: Sometimes, mixing tow or more materials together results in a chemical reaction.

A

True

61
Q

A chemical process by the plant that converts the sun’s light and heat energy to chemical energy.

A

Photosynthesis

62
Q

Is decaying food an example of a harmful chemical change? Yes or No.

A

Yes

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