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Ortoclásio (KAλSi3O8) é um mineral da classe do feldspato (aluminosilicatos), com grande importância na formação de rochas ígneas. Ele pode sofrer hidrólise ácida formando o mineral caulinita (Aλ2Si2O5(OH)4) e ácido silícico, representado por X na equação balanceada.
De acordo com a estequiometria da reação apresentada, a fórmula do ácido silícico, representado por X na equação, é:
(A) H4SiO3
(B) H4SiO4
(C) H2SiO3
(D) H2SiO2
(E) H3Si2O3
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Vamos analisar a reação de hidrólise ácida do ortoclásio (KAlSi3O8) formando caulinita (Al2Si2O5(OH)4) e ácido silícico (X). A fórmula do ácido silícico comumente formada em reações de hidrólise de silicatos é H4SiO4. Portanto, a alternativa correta é: (B) H4SiO4

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NASA

In the tranquil city of Naples, Florida, USA, the Otero family recently experienced a heart-stopping moment when a small fragment of space debris crashed through their roof. No one was hurt, but if the debris had struck someone, it could have ended in tragedy.

The object that hit the Otero home was a piece from a discarded battery, originally weighing several tons, once used aboard the International Space Station (ISS). The battery was released from the ISS in 2021, and expected to burn up upon reentry from orbit. But the smartphone-sized portion that struck the Otero residence survived, and, in crashing back to Earth, carried with it the weight of our unsustainable approach to space exploration. Our linear model — where satellites, like single-use plastics, are launched and abandoned — is contributing to the growing threat of space debris.

Proponents of a circular space economy advocate for a transformative departure from this wasteful paradigm. Much like embracing reusable materials on Earth, transitioning to a circular space economy means designing space systems with reuse and recyclability in mind. Satellites should be built to have extended lifespans, favoring upgrades and modifications rather than being discarded after a single mission.

The incident in Naples serves as a wake-up call — a call to action demanding innovation, collaboration and responsibility towards the cosmos. Let us seize this pivotal moment to redefine our relationship with space — a relationship founded on principles of reverence for the awe-inspiring wonders of our universe.

(Moriba Jah. https://edition.cnn.com, 09.05.2024. Adaptado.)

1 space debris are human-made objects in space — principally in Earth orbit — which no longer serve a useful function.
The text mainly
A) points to the risks space debris can bring to satellites currently in the Earth’s orbit.
B) defends the urgent need for a profound move towards sustainable space practices.
C) favors the reproduction of linear models aimed at reuse and recyclability.
D) describes the incident caused by space debris in Naples, USA, which ended in tragedy.
E) raises possibilities about what to do with space debris falling from the surface of our planet.

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