Question

fill in the blank
complete each statement using a term or terms from the list below. write your answer in the spaces
provided
the air oxide new products oxygen speeds
crumbles underground caves rain water rust carbon dioxide
carbonic acid

1. most chemical weathering is caused by the actions of _

_, and _.

1. chemical weathering always forms _.
2. oxygen links up with iron to form the compound called iron _.
3. another name for iron oxide is _.
4. rust _ easily.
5. the oxygen that rusts iron come from _.
6. carbonic acid is formed when _ dissolves in water.
7. carbon dioxide comes from _.
8. dissolved limestone may form _.
9. hot, moist weather _ chemical weathering.

matching
match each term in column a with its description in column b. write the correct letter in the space
provided
column a column b
_ 1. rust a) form carbonic acid
_ 2. water and carbon dioxide b) dissolves limestone
_ 3. cold, dry climate c) speeds chemical weathering
_ 4. carbonic acid d) iron oxide
_ 5. warm, moist climate e) slows chemical weathering

Explanation:

For fill - in - the - blank questions:

1. Chemical weathering is mainly due to rainwater (which can act as a solvent and reactant), carbonic acid (formed from water and carbon dioxide and is a common agent in chemical weathering).
2. By definition, chemical weathering changes the mineral composition and forms new products.
3. When oxygen reacts with iron, it forms iron oxide.
4. Rust is the common name for iron oxide.
5. Rust is a flaky and weak substance that crumbles easily.
6. The oxygen for rusting iron is from the air.
7. Carbonic acid is formed when carbon dioxide dissolves in water (\(CO_{2}+H_{2}O = H_{2}CO_{3}\)).
8. Carbon dioxide can come from the air.
9. Dissolved limestone (calcium carbonate) can form underground caves through processes like solution in acidic water.
10. Hot and moist conditions provide more energy (from heat) and reactants (water), so they speed chemical weathering.

For matching questions:

1. Rust is iron oxide.
2. Water and carbon dioxide react to form carbonic acid (\(CO_{2}+H_{2}O = H_{2}CO_{3}\)).
3. Cold and dry climates have less water (a key reactant in many chemical weathering processes) and less energy (from heat), so they slow chemical weathering.
4. Carbonic acid can dissolve limestone (\(H_{2}CO_{3}+CaCO_{3}=Ca(HCO_{3})_{2}\)).
5. Warm and moist climates have more water and heat, which speed up chemical reactions involved in weathering.

Answer:

Fill - in - the - blank

1. rain water, carbonic acid
2. new products
3. oxide
4. rust
5. crumbles
6. the air
7. carbon dioxide
8. the air
9. underground caves
10. speeds

Matching

1. d
2. a
3. e
4. b
5. c