Answer:1. Ethanol + Dioxygen = Carbon Dioxide + Water
Explanation:
Answer : Option B) <span>The oxygen in the air forms ozone in presence of UV rays
Explanation : The other given options for the chemical change seems to be irrelevant as the option A which converts water into different forms can be called as physical change, option C only dust and soot particle are released in air where no new substance is formed And in option D sulfur dioxide is getting released into air which is also a form of a physical process.
So in option B we can see a new compound getting formed which is ozone in presence of UV rays hence it is a chemical change.</span>
Answer: An X-ray has a wavelength of 1.15 x 10-10 m. What is its frequency? 1.15 x 10-10 m 2.61 x 1018 1/s = ν Page 16 What is the speed of an electromagnetic wave that has a frequency of 7.8 x 106 Hz? classical physics assumed that radiating energy was continuous, due to its wavelike nature
Answer: 0.0826mol
PV=nRT
n=PV/RT
n=(1atm)(2.1L)/(310K)(0.082057L*atm/mol*K)=0.0826mol
Answer:
Sand - A network
Dry Ice - Molecule
Lime - Ionic
Gold bar - Metallic
Explanation:
The items are;
dry ice (CO2)
lime (CaO)
gold bar (Au)
sand (SiO2)
The options are;
molecular,
an ionic,
a network,
or a metallic solid
Among the items, the only metal present is the gold bar. So it makes sense that the gold bar is matched with 'Metallic solid'.
The Calcium oxide is an 'ionic' compound as it contains the calcium ion and the oxygen ion bonded by an electrovalent bond.
Dry Ice, CO2 is a molecule composed of one carbon atom bonded to two oxygen atoms via two double bonds. So it is matched with 'Molecular'
The only option left is 'A network' and it is matched with Sand (SiO2).
The result is given as;
Sand - A network
Dry Ice - Molecule
Lime - Ionic
Gold bar - Metallic