Though helium doesn't usually react with other substances due to its full electron shell, it doesn't mean it lacks chemical properties. Properties like atomic number, atomic mass, density, and reactivity are its chemical properties.
The statement that helium does not usually react with other substances is correct. This is due to helium being a noble gas with a complete set of electrons in its outer shell, making it stable and unlikely to participate in chemical reactions. However, this does not mean it has no chemical properties. Properties such as atomic number, atomic mass, density, and the inability to react or bond with other elements are indeed chemical properties.
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B. from ice to water
C. from a vacuum to air
D. from glass to air
Answer:
Option (C) from a vacuum to air
Explanation:
Speed of light in any media depends on the refractive index(n) of the medium in which light is travelling.The medium having least refractive index have the fastest speed of the light.As the refractive index of the vacuum is less(1.0000) than that of the air(1.0003), so the speed of light will slows down while moving from vacuum to air.The refractive index 'n' is the ratio between speed of light in vacuum(c) to the speed at which the light is travelling i.e v, (n = c / v).
-atoms splitting to make heat which in turn turns a generator to make electricity
-car battery turning a car on
-food making you run
Answer:
A car battery turning a car on.
For precipitation to happen, first tiny water droplets must condense on even tinier dust, salt, or smoke particles, which act as a nucleus. Water droplets may grow as a result of additional condensation of water vapor when the particles collide. If enough collisions occur to produce a droplet with a fall velocity which exceeds the cloud updraft speed, then it will fall out of the cloud as precipitation.