Question was provided via image upload.

Question

Accepted Answer

### 1a)
# Brief Explanations:
Rust is formed by the reaction of iron with oxygen (and water). So the correct pair is iron and oxygen.
# Answer:
a) iron, oxygen

### 1b)
# Brief Explanations:
Oxygen for rusting comes from the air. Rain provides water, but oxygen is from the air.
# Answer:
the air

### 2)
# Brief Explanations:
The chemical formula of rust is iron oxide (Fe₂O₃·nH₂O), so the correct term is iron oxide.
# Answer:
iron oxide

### 3)
# Brief Explanations:
Rusting occurs faster in warm and moist conditions as water and heat accelerate the chemical reaction. Cold and dry conditions slow it down.
# Answer:
warm and moist

### 4)
# Brief Explanations:
Rusting involves a chemical change (formation of new substance, iron oxide) from iron, so it's chemical weathering. Mechanical weathering is physical breakdown.
# Answer:
chemical

### 5)
# Brief Explanations:
Limestone (calcium carbonate) is dissolved by carbonic acid (formed from CO₂ and water). Carbonic acid reacts with CaCO₃ to form soluble compounds.
# Answer:
carbonic acid

### 6)
# Brief Explanations:
Carbonic acid (H₂CO₃) forms when carbon dioxide (CO₂) dissolves in water (H₂O), so CO₂ combines with water.
# Answer:
carbon dioxide, water

### 7)
# Brief Explanations:
Carbon dioxide is present in the air (from respiration, combustion, etc.), so it comes from the air.
# Answer:
the air

### 8)
# Brief Explanations:
Dissolving limestone involves a chemical reaction (with carbonic acid), changing its chemical composition, so it's chemical weathering.
# Answer:
chemical

### 9)
# Brief Explanations:
Chemical weathering is defined as the process that changes the chemical composition of rocks, so it does change the chemicals in rocks.
# Answer:
does

### 10)
# Brief Explanations:
Chemical weathering produces new substances (e.g., rust from iron, soluble salts from limestone dissolution), so it does form new products.
# Answer:
does

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

1a)

Answer:

1b)