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) ↓

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

1. they vary with a higher number because boiling is way hotter than melting