The Lewis dot model of a molecule is shown. A visual diagram of a PCl3 molecule is shown. Phosphorous is the central atom with a
horizontal line connecting to each of the three Chlorine atoms around it. Phosphorous has a pair of dots on it. Each of the three chlorine atoms have a pair of three dots on it. Based on the model, which of the following is true? ( a. The electronegativity difference between phosphorous and chlorine is greater than 1.7.
( b. Each chlorine has three non-bonded pairs and one bonded pair of electrons.
( c. Phosphorous has three non-bonded pairs and one bonded pair of electrons.
( d. Phosphorous has three valence electrons in the outermost energy level.
b. Each chlorine has three non-bonded pairs and one bonded pair of electrons.
Explanation:
Chlorine has three valance electrons. Each Cl atom forms a single covalent bond with the central P atom by sharing a pair of electrons. After forming a single covalent bond each Cl atom is left with six electrons that do not participate in any bond formation or there are three pairs of lone electrons.
Calcium is then pumped back into the sarcoplasmic reticulum breaking the link between actin and myosin.
Explanation:
Actin and myosin return to their unbound state causing the muscle to relax. Alternatively relaxation (failure) will also occur when ATP is no longer available.
This impurity is troubling from an economic standpoint because it lead to decrease in the yield of phosphorus
Ferrophosphorus is a byproduct of phosphorus production in submerged-arc furnaces , by their reduction with carbon. It is formed from the iron oxide impurities.
Iron impurities present in the calcium phosphate will be precipitated out as the iron phosphate which eventually will lead to the decrease in the yield of phosphorous during the production of phosphorous.
Thus we can conclude that Fe₂P causes decrease in yield
Cell theory states that all the living organisms are made up of basic structural and functional units, cells. All cells divide and give rise to new cells. All the cells have similar chemical composition. The nuclei acid DNA present in the chromosomes helps in carrying hereditary information from generation to generation. So, in order to sustain life the cells must contain DNA either enclosed in the nucleus or freely floating in the cytoplasm.
