Answer:
option D - coking or fouling
Explanation:
Coking (not cocking) is the process involving the deposition of small carbon particles (created by simply putting carbon atoms) on a catalyst's accessible surface, leading in a reduction in the area accessible for catalytic activity. This is also sometimes related to fouling catalysts or merely fouling them.
Answer:
The balanced equation is given below:
SiO2 + 4HF —> SiF4 + 2H2O
The coefficients are 1, 4, 1, 2
Explanation:
The equation for the reaction is given below:
SiO2 + HF —> SiF4 + H2O
The above equation can be balance by as follow:
There are 4 atoms of F on the right side and 1 atom on the left side. It can be balance by putting 4 in front of HF as shown below:
SiO2 + 4HF —> SiF4 + H2O
Therefore are 4 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 2 in front of H2O as shown below:
SiO2 + 4HF —> SiF4 + 2H2O
Now the equation is balanced.
Answer:
B. Quartz represents an element as SiO2
Explanation:
A chemical element is a substance composed of only one kind of atom that determines its own unique properties that are different from that of other elements. An element cannot be broken down further as it represents the simplest form a substance can attain.
Chemical elements are usually labelled using symbols. These symbols contain only one capital letter for each element, which cannot excede two alphabets. For example, Silicon is an element with the symbol, Si while Calcium is an element with symbol Ca.
Note: in this question, Quartz (SiO2) is not an element but rather a compound because it is composed of two elements, forming a compound.