hydrogeochemistry

What two minerals are primarily responsible for producing hard water?

• Magnesium and potassium

• Calcium and magnesium

• Calcium and iron

• Magnesium and iron

Which of the following types of water is most likely to contain the highest amount of dissolved minerals?

• Rainwater that has just reached the Earth's surface

• Rainwater before it reaches the Earth'ssurface

• Groundwater located in a deep aquifer

• Groundwater located within shallow soil

What is the most common element in the continental crust?

• Si

• O

• Fe

• Ca

What is the meaning of "Electroneutrality"

• There are no any cations or anions in a solution

• sum of positive charges = sum of negative charge

• mole of anions = mole of cations

• all are correct

what is the definition of "neutral solution" ?

• deionized water

• pH = 7

• concentration of hydrogen ion =hydroxide ion

• all are correct

what is the oxidation number of "S" in SO₄

• -2

• -4

• +6

• +2

Stalactites and stalagmites in caves are mostly composed of

• halite

• alkali feldspar

• calcite

• quartz

Which of the following can contaminate an aquifer?

• gas stations

• landfills

• agricultural regions

• all of these

What can happen when CO₂ is removed from "soda water" ?

• pH increase

• precipitation of some metals

• The water will be more basic

• all are correct

If water temperature goes UP, what happens to the level of Dissolved oxygen?

• It goes up

• It stays the same

• It goes down

• It increases exponentially