Science Chapter 2 and 3 Flashcards
It refers to the amount of matter.
mass
True or False: Matter has mass?
TRUE
The space occupied by an object is called?
volume
The product of the length, width and height of the object, it is expressed in cubic centimer (cm3) or cubic meter (m3) is called?
volume
Used to measure the volume of liquids?
graduated cylinder
The surface of a liquid in a graduated cylinder is curved, this curve is called?
meniscus
The line that corresponds to the meniscus is the?
volume of the liquid.
How to determine the volume of a regular object like a box?
measure the length of all the sides
How to determine the volume of a irregular objects, like a ring or stone?
by water displacement
It describes the amount of particles of matter in a specific space an object takes up?
Density
Why does ice float on water?
Ice is less dense than water, hence it will float.
Density Formula
D = M / V (check your book)
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.
Capillarity
A process of taking up liquids through minute pores of a substance.
Absorption
Materials that absorb liquids are called?
absorbent materials
Give 3 examples of absorbent materials?
tissue, towel or cloth, paper
Materials that do not absorb liquid are called?
nonabsorbent material
Give 3 examples of nonabsorbent materials?
cup, saucer, plastic or ceramic basins
Materials that will decay and give a bad smell, and also help make the soil fertile are called?
biodegradable materials
Are organisms that cause biodegradable materials to decay, break down biodegradable waste are called?
decomposers
Materials that will not decay at all or some it takes a very long time to decay are called?
nonbiodegradable materials
True or False: Nonbiodegradable materials may become toxic and may cause pollution if not properly stored or disposed of?
True
Review the Decaying time of Materials
Page 46 of your book!
True or False: The process of decay is caused by bacteria and fungi?
True
True or False: The decay or decomposition process produces bad odor and certain gases, including ammonia and hydrogen sulfide.
True
Happens when you eat spoiled food. It may cause vomiting, stomach pain, cramps or diarrhea. It may even cause death.
Food poisoning
What are the diseases that rats, cockroaches and mosquitoes carry when decaying wastes are not properly disposed?
leptospirosis, dengue and malaria
Give me 8 ways on controlling decay?
Drying, Refrigeration or Freezing, Vacuum packing, Salting or Curing, Smoking, Preservatives, Pickling , Canning
One of the most popular food preservation techniques. This reduces water activity to prevent the growth of molds and bacteria.
Drying
Freezing preserves food by slowing down the growth of orgranisms which cause food to decay.
Refrigeration
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
Removes moisture from the meat, and it is cured with salt or sugar.
Salting or curing
Used for perishable food items like fish. It lengthens the shelf life of food items.
Smoking
The amount of time a material may be stored without becoming unfit for consumption.
Shelf life
Are food additives that do not allow the growth of bacteria or mold.
Preservatives
Example of a preservative like salitre?
nitrates
Is a method of preserving food in an edible liquid that inhibits or kills bacteria and other microorganisms.
Pickling
Involves sealing foods in sterile cans or jars and boiling the cans to kill or weaken any remaining bacteria.
Canning
Things you do not need may be classified as?
waste
Things you do not use are classified as?
unused
Some people buy extra things as reserve like a pair of sneakers are called?
spare
How do you practice Zero Waste Management?
Recycle and reuse materials.
True or False: To keep the environment clean, waste materials must be properly disposed of?
True
Is a natural process that breaks down organic materials into reusable resource.
composting
When a material changes only in size, shape, and form, the material undergoes _________.
physical change
When a material involves a change in properties like color, odor, taste and resulted in a new material. Such change is called?
chemical change
True or False: Physical change may also be a change in the phase of matter.
True
The process of changing a solid into a liquid is called?
melting
The process of changing a liquid into a gas is called?
evaporation
The process of changing a gas into a liquid is called?
condensation
The process of changing liquid into a solid is called?
freezing
A solid changes directly to gas. It does not pass through the liquid state. This process is called?
sublimation
The particles of gas move freely and rapidly and can directly change into solid particles is called? The opposite of sublimation.
deposition
Fire extinguisher, filled with gaseous carbon dioxide that releases a white powder is an example of?
deposition
True or False: A chemical change occurs when a new substance with properties different from the original substance is formed.
True
True or False: The properties of matter chnages when there is change in temperature.
True
Describes how hot or cold an object is.
Temperature
Used to measure temperature.
Thermometer
Is a combination of two or more substances.
Mixture
True or False: Sometimes, mixing tow or more materials together results in a chemical reaction.
True
A chemical process by the plant that converts the sun’s light and heat energy to chemical energy.
Photosynthesis
Is decaying food an example of a harmful chemical change? Yes or No.
Yes