Unit 9: Chemical Matter

What is the chemical compound known as salt to chemists?

• Sodium bicarbonate

• Sodium chloride

• Chlorine dioxide

• Sodium hydroxide

What are the chemical symbols for sodium and chlorine, the elements that make up salt?

• Na and Cl

• S and C

• Na and Ci

• So and Ch

How was salt traditionally obtained from seawater in ancient times?

• By filtering the seawater

• By chemical reactions

• By letting the water evaporate

• By mining underground

What is the main source of salt mentioned in the text?

• River water

• Seawater

• Underground mines

• Salt lakes

Why do we hardly think twice when using salt according to the text?

• Because it is difficult to find

• Because it is expensive

• Because it is rare

• Because it is plentiful and inexpensive

What is the traditional method of harvesting salt from the ocean called?

• Ocean salt extraction

• Solar salt production

• Seawater evaporation technique

• Salt crystal harvesting

Why is the Great Salt Lake much saltier than the ocean?

• It has no outlet for water to flow out.

• It is smaller than the ocean.

• It is a man-made lake.

• It receives less rainfall.

Which of the following is true about the Great Salt Lake?

• It is suitable for fish and most other types of living things.

• It is less salty than the ocean.

• It is home to tiny brine shrimp.

• It is the largest body of water on Earth.

When did commercial solar salt-making around the Great Salt Lake begin?

• Before 1847

• In 1847

• In 1900

• After 1900

What is the estimated amount of salt in the Great Salt Lake?

• Nearly 5 million tons

• Nearly 5 billion tons

• Nearly 2.5 million tons

• Nearly 2.5 billion tons