Answer: sulphur is an element with RAm of 32g/mol
Saturated solution is the solution which do not dissolve more soulute at given temperature
Answer:
molecularity of the rate-determining step
Explanation:
The rate determining step of a sequence of reactions is the slowest step in the sequence of non-elementary reactions.
The molecularity of the slowest step in the reaction mechanism gives us the rate law of reaction.
It is for this cause that the slowest step in the reaction sequence is called ''rate determining step'' since it determines the rate law of reaction.
Answer:
Answer is option D.
The terms vitrification, oxidation, water smoking, and flashing are all associated with firing bricks in a kiln.
Explanation:
Brick is one of the building materials made from the clay. The manufacturing process of brick include;
1) Winning - It is the process of mining of clay and its transportation to the manufacturing site.
2) Preparation - It includes the crushing and grinding of clay and later mixing them into a uniform raw material.
3) Forming/Molding - It is the process of mixing water with the clay mix and mold it into the desired shape. The plasticity of the clay depends on the amount of water used.
4) Drying - The process of removing the moisture from wet clay by drying it through evaporation.
5) Firing and Cooling - Firing is the process of burning the clay in a kiln and it usually requires 40 - 150 hours. The different stages in firing are;
- Water smoking or dehydration stage - It is a process in which free water retained in the pores of the clay after drying gets evaporated under a high temperature of 400-650°C and the clay loses its plasticity. Some of the carbonate minerals are eliminated.
- Oxidation - This process occurs at a very high temperature of 650-900°C in which the ferrous iron is oxidized to the ferric form and the remaining carbon is eliminated.
- Vitrification- This process occurs at a very high temperature of 900- 1100°C for low melting clay and 1000-1250°C for high melting clay, where the clay is transformed into a soft molten mass as a result of an increase in temperature. It gradually loses the shape and transforms into a glassy structure after cooling.
- Flashing - In this process, the fire in the kiln is regulated in such a way that it causes a reduction in the kiln temperature and the cooling process begins which produces color variations in bricks.
6) Drawing - It is the process involving the unloading of the kiln after cooling and packing of the bricks for further shipment.
Answer: genus
Explanation:
Amoebas do not form a single taxonomic group; instead, they are found in every major lineage of eukaryotic organisms. Amoeboid cells occur not only among the protozoa, but also in fungi, algae, and animals.
Answer:
(E) -1835 kJ
Explanation:
Use Hess law to answer this question by manipulating algebraically the equations :
Eq .1 PCl5(s) → PCl3(g) + Cl2(g) ΔH°rxn = +157
Eq.2 P4(g) + 6 Cl2(g) → 4 PCl3(g) ΔH°rxn = -1207 kJ
to arrive to the equation in our problem:
P4(g) + 10 Cl2(g) → 4PCl5(s) ΔH°rxn = ?
Notice PCl₅ is the product in our equation and in Eq. 1 is a reactant so we need to reverse it. We need also to multiply it by 4 since that is the number required in the question.
P₄ in equation 2 is a reactant and is also a reactant in our desired equation also it is 1 mol in both. That is telling us to leave it as it is and we can then proceed to add it the the -4 times Eq1 and check everything is right when we add them together.
4PCl3(g) + 4Cl2(g) → 4PCl5(s) ΔH°rxn = -4 x (157 kJ) (change the sign)
P4(g) + 6 Cl2(g) → 4 PCl3(g) ΔH°rxn = -1207 kJ
___________________________________________
P4(g) + 10 Cl2(g) → 4PCl5(s) ΔH°rxn = -4 x (157 kJ) + -1207 kJ
ΔH°rxn = -1835 kJ
See how the PCl3 cancel and the Cl add correctly.