13.122 When salt is spread on snow-covered roads at - 2 °C, the snow melts. When salt is spread on snow-covered roads at - 30 °C, nothing happens. Explain.

Video transcript

Hello everyone today. We have the following problem explain what happens to snow on snow covered roads. When salt is spread at negative 1.5°C and -29°C. Well When salt is spread at negative 1.5°C, the snow melts so the snow is going to melt. And so why is this? This is because reasonable amounts of snow can lower the freezing point, the freezing point at only a small deviation from the normal freezing point of pure water, Which is 0°C, so from the freezing point of water Which is 0°C, so it's only by a small margin. And so when we have salt that is spread on snow at -29°C, nothing will actually happen. So nothing happens. And so why is this? That is because a reasonable amount of snow is not capable of lowering the freezing point 2 29 or -29°C. And the answer choice that best correlates that's answer choice D the snow melts when salt is spread on snow covered roads at negative 1.5 degrees Celsius, but it is not affected when salt is used at negative 29 degrees Celsius. And with that we've answered the question overall, I hope that this helped and until next time