Answer:
Expose the paper to the atmosphere or moisture
Explanation:
An interesting experiment that demonstrates the equilibrium of complexes is that of the invisible ink.
The invisible ink is pink colored [Co(H2O)6]Cl2 which is essentially colorless and pale when it is used to write on paper. This complex is almost colorless when dilute. Therefore, when it is used in writing, the writing can not be seen.
However, if the paper is left to stand or allowed to absorb moisture; the following equilibrium is set up:
[Co(H2O)6]Cl2 ⇄ [CoCl2(H2O)2] + 4H2O
The formation of blue [CoCl2(H2O)2] on standing or exposure to moisture enables the colored writing to be easily read.
Answer:
A double displacement reaction is a type of reaction in which two reactants exchange ions to form two new compounds. Double displacement reactions typically result in the formation of a product that is a precipitate.
Explanation:
Answer:
1728 kg is the mass of air for the room
Explanation:
An exercise of unit conversion.
The volume of the room will be:
24 m . 15 m . 4m = 1440 m³
Density of air is 1.20 g/L which means that in 1L, there is contained 1.20 g of air.
1L = 1dm³
1m³ = 1000 dm³
1440 m³ . 1000 = 1440000 dm³ ⇒ 1.44x10⁶ L
Density of air = 1.20 g/L = mass of air / volume of air
1.20 g/L = mass of air / 1.44x10⁶ L
1.20 g/L . 1.44x10⁶ L = mass of air → 1728000 grams
1 g = 1x10⁻³ kg
1728000 g / 1000 = 1728 kg
Answer:
The correct answer is option (B) Two molecules of H2 and a molecule of O2 must collide at one time
Explanation:
2H2(g) + O2(g) → 2 H2O(g)
2 1 2
Considering the given reaction, for water molecule to be form, two molecules of hydrogen and one molecule of oxygen must collide at the same time. The product obtained from the collision is two molecules of water as steam. 2 H2O(g)
