A substance has a melting point of 49 deg. Celsius and a boiling point of 457 deg. Celsius. It has fixed composition and cannot be seperated into simpler component substance by physical means. It conducts elctricity and is not transparent or translucent. At room temperature, the substance can be best described as:
a) a pure substance in the liquid state.
b)a mixture in the liquid state.
c)a pure substance in the solid state.
d)A mixture in the solid state.
e)A pure substance in the gaseous state.
2007-02-20 16:12:21 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Letter C
It does not melt until well above room temperature so it must be a solid. It cannot be separated by physical means so it must be and element or a compound. It has a fixed composition so it must be an element or a compound. It is not transparent or translucent so it is not a mixture. An element or a compound is known as a "pure" substance. It will have a definite melting and boiling point.
2007-02-20 16:35:58 · answer #1 · answered by physandchemteach 7 · 1⤊ 0⤋
Since it melts at 49 degrees, and 49 degrees is much higher than room temp, it must be solid. Since it cannot be separated into simpler component substances, it must be pure.
c)a pure substance in the solid state.
2007-02-20 16:28:50 · answer #2 · answered by extton 5 · 0⤊ 0⤋