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100
What is the product when water is added to lime?
slaked lime
100
What is the product when more water is added to slaked lime?
lime water
100
Between methane and carbon dioxide, which is more potent in trapping heat?
methane
100
Name gaseous pollutant in the atmosphere.
Sulfur dioxide, nitrogen oxides, volatile organic compounds (VOCs), and particulate mater
100
Why is photochemical smog a problem?
can cause difficulty in breathing, irritation in the respiratory system, and reduced lung function
200
What is the gas that can cause acid rain and can combine with other gases in very hot weather to cause photochemical smog.
Nitrogen oxides
200
What gaseous pollutant combines with haemoglobin in the blood and stops it from carrying oxygen?
Carbon monoxide
200
What can be attached to the exhaust systems of cars to convert carbon monoxide and nitrogen dioxide into carbon dioxide and nitrogen?
Catalytic converter
200
What gas enters the air through respiration and burning and it is removed by plants during photosynthesis?
Carbon dioxide
200
What do you call the process of removing salt from water to make it drinkable potable?
Desalination
300
What is the purpose of using ozone in treating a dirty water?
To break disinfect and remove inorganic contaminant such as metals and fertilizers.
300
What is the purpose of filtration in water treatment process?
to remove solid and suspended particles
300
What is the purpose of adding chlorine in the water treatment process?
kills bacteria, viruses, and other microorganisms that cause disease
300
What phase of matter of A,B,C,D, and E?
A - solid, B - solid to liquid, C - liquid, D - liquid to gas, E - gas
300
How can you separate iron filings and sand?
Use magnet
400
How can you separate salt and water?
Evaporate the water
400
How can you separate water and ethanol?
using fractional distillation method
400
What is the meaning of immiscible?
liquids incapable of being mixed or blended together
400
How can you separate immiscible liquids?
decant it
400
What subatomic particle determines the atomic number?
proton
500
What determines the mass or nucleon number?
number of protons and neutrons
500
How will you determine the period of an element?
based on its number of shells/ row in the periodic table
500
How will you determine the group of an element?
based on its number of valence electron/ based on its column in the periodic table
500
What is an isotope?
atoms of the same kind but different numbers of neutrons(different atomic masses)
500
How many electrons are there in the first, second, and third shell?
first 2, second 8, third 8
for transition elements: first 2, second 8, third 18