During chemistry lab, Carl and his lab partner, Mary, mixed four halide salts, one at a time, with silver nitrate. Mary commented that
all but one salt reacted chemically with the silver nitrate. Carl asked her how she knew that a chemical reaction had occurred. What
was Mary's response based on evidence in this activity?
al reaction the corecmented that
A)
A gas formed.
A precipitate formed.
The silver nitrate disappeared.
An exothermic reaction took place

A precipitate formed. The one that does not react is the salt from fluoride because it is soluble

Explanation:

The halide salts are made of:

Cl⁻  → Chloride

F⁻  →Fluoride

Br⁻  → Bromide

I⁻ → Iodide

The solution contains AgNO₃

When the AgNO₃ dissociates in aqueous solution, it produces silver cation and nitrate anion

AgNO₃ (aq) → Ag⁺ (aq) + NO₃⁻(aq)

Ag⁺  can react to the halides and the all make precipitate except for the F⁻

Ag⁺(aq) + Cl⁻(aq)  → AgCl (s) ↓

Ag⁺(aq) + F⁻(aq)  →AgF (aq)

Ag⁺(aq) + Br⁻(aq)  → AgBr (s) ↓

Ag⁺(aq) + I⁻ (aq) → AgI (s) ↓

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.