Question

Помогите пожалуйста, очень срочно!!! Почему прокаленная на огне кость становится хрупкой, а выдержанную в 10%-ном растворе соляной кислоты можно завязать узлом? А) потому, что в первом случае разрушаются органические вещества, а во втором – неорганические В) потому, что в первом случае разрушаются неорганические вещества, а во втором – органические С) потому, что нарушаются молекулярные связи D) потому, что и в первом, и во втором случае разрушаются поверхностные ткани кости

Answer 1

Ответ (B). Потому что когда разрушается неорганические кость может почернетью  органика не горит.

Answer 2

Why does bone become brittle when heated and can be tied in a knot when soaked in a 10% solution of hydrochloric acid?

When bone is heated, it becomes brittle because the organic components of the bone, such as collagen, are destroyed. On the other hand, when bone is soaked in a 10% solution of hydrochloric acid, it can be tied in a knot because the acid dissolves the inorganic components of the bone, such as calcium phosphate, leaving behind a flexible organic matrix.

The organic components of bone, primarily collagen, provide flexibility and strength to the bone structure. When bone is heated, the high temperature causes the organic components to break down, leading to the loss of their structural integrity. This results in the bone becoming brittle and more prone to fractures [[1]].

On the other hand, when bone is soaked in a 10% solution of hydrochloric acid, the acid reacts with and dissolves the inorganic components of the bone, primarily calcium phosphate. This process is known as decalcification. The acid removes the calcium phosphate, leaving behind a flexible organic matrix. This organic matrix can be manipulated and tied in a knot because it retains its structural integrity despite the loss of the inorganic components [[2]].

In summary, the brittleness of bone when heated is due to the destruction of the organic components, while the ability to tie bone in a knot when soaked in a 10% solution of hydrochloric acid is due to the removal of the inorganic components by the acid.