CHEMISTRY
what state of matter is water after it is boiled.
what is gas?
Nonzero digits are always significant figures?
Yes, all nonzero digits are always significant figures. These digits (1-9) are significant because they represent a measured value, and any digit in a measurement that has meaning is considered significant.
what are fundamental forces at different scales.
how is matter held together?
What is the Law of Conservation of Energy?
The law of conservation of energy states that energy cannot be created or destroyed, only transferred or transformed from one form to another. This means the total amount of energy in an isolated system remains constant over time, even as it changes from, for example, chemical to mechanical energy, or kinetic to thermal energy.
Can you light carbon on fire?
Yes.
Yes, gold can be created from other elements through nuclear reactions, a process that has been demonstrated in particle accelerators and is how gold is formed in space. However, it is extremely expensive and not a practical way to produce gold, as the cost is far greater than the value of the gold produced.
NO. While they have the same number of protons, they can differ in the number of neutrons (making them isotopes) or in the energy states of their electrons, making them unique.
Yes, air can make shadows, especially when there are differences in air density or when it contains particles. While clean, uniform air is mostly transparent, variations in temperature or pressure create density gradients that refract (bend) light, causing faint or shimmering shadows. Pollutants, water droplets, or ice crystals in the air can also block and scatter light to cast more visible shadows.
Yes, water can stay liquid below zero degrees Celsius through a phenomenon called supercooling, where pure water is cooled below its freezing point without a solid surface or impurity to start ice crystal formation. Supercooled water is unstable and can flash freeze if disturbed, a principle observed in nature with freezing rain. Another method is adding solutes like salt, which lowers the freezing point of the water.
Is the universe infinite?
No one knows for sure if the universe is infinite; it could be either finite or infinite. While the observable universe is finite (with a radius of about 46.5 billion light-years), the universe as a whole may extend far beyond this, and its total size is unknown. The universe has been expanding since the Big Bang, but whether it will continue expanding forever or eventually curve back on itself (be finite) is still a subject of ongoing research..