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Answers for I-Practice Science

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Write the chemical formulas for each of these gases and select whether the gas is heavier, lighter or about the same as air

Gas Chemical Formula Heavier, lighter or about the same as air
Ammonia NH3 Lighter than air
Carbon dioxide CO2 Heavier than air
Carbon monoxide CO About the same as air
Chlorine Cl2 Heavier than air
Helium He Lighter than air
Hydrogen sulfide H2S Heavier than air
Methane CH4 Lighter than air
Nitrogen N2 About the same as air
Oxygen O2 Heavier than air
Ozone O3 Heavier than air
Sulfur dioxide SO2 Heavier than air

 

Write the chemical reactions for denitrification starting with nitrate in chemical symbols and their chemical names

NO3- → NO2- → N2↑

 

Nitrate → Nitrite → Nitrogen gas

 

Write the chemical reactions for nitrification starting with ammonia in chemical symbols and their chemical names

NH3 → NO2- → NO3-

 

Ammonia → Nitrite → Nitrate

 

ORP stands for

  1. Orthophophate

  2. Oxidation reduction potential

  3. Oxidizing reductng potential

  4. Oxygen replacement probability

ORP stands for B.  Oxidation reduction potential

 

Which of the following pHs is most basic?

  1. 4

  2. 6

  3. 8

  4. 10

The most acidic pH is D.  10

 

Which of the following pHs is most acidic?

  1. 4

  2. 6

  3. 8

  4. 10

The most acidic pH is A.  4

 

OH-, Cl-, SO4-2, and HCO3- are called

    Anions

 

H+, Ca+2, Mn+4, and Fe+3 are called

    Cations

 

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