Answer:the second one
Explanation:,Hydrogen bonding is a special type of dipole-dipole attraction between molecules ,not a covalent bond to a hydrogen atom. It results from the attractive force between a hydrogen atom covalently bonded to a very electronegative atom such as a N, O, or F atom and another very electronegative atom.
Answer:
23 L
Explanation:
We'll begin by converting celsius temperature to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T₁) = 100 °C
Initial temperature (T₁) = 100 °C + 273
Initial temperature (T₁) = 373 K
Final temperature (T₂) = 50.5 °C
Final temperature (T₂) = 50.5 °C + 273
Final temperature (T₂) = 323.5 K
Finally, we shall determine the initial volume of gas. This can be obtained as follow:
Initial temperature (T₁) = 373 K
Final temperature (T₂) = 323.5 K
Final volume (V₂) = 20 L
Initial volume (V₁) =?
V₁/T₁ = V₂/T₂
V₁ / 373 = 20 / 323.5
Cross multiply
V₁ × 323.5 = 373 × 20
V₁ × 323.5 = 7460
Divide both side by 323.5
V₁ = 7460 / 323.5
V₁ = 23 L
Thus, the original volume of the gas is 23 L
Answer:
Rotting vegetation and erupting volcanoes release some chemicals that can cause acid rain, but most acid rain is a product of human activities. The biggest sources are coal-burning power plants, factories, and automobiles.
Explanation:
Calcium hydroxide is produced commercially by treating lime with water: CaO + H2O → Ca(OH) In the laboratory it can be prepared by mixing aqueous solutions of calcium chloride and sodium hydroxide.
Quicklime is used for whitewashing as it produces calcium hydroxide (CaOH) when it reacts with water (H2O) and absorbs carbon dioxide (CO2) from the environment, as a result, it produces calcium carbonate (CaCO3) which creates a hard coating on the walls.
