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chemistry
The reagent shelf in a general chemistry lab contains aqueous solutions of the following substances: silver nitrate, sodium chloride, acetic acid, nitric acid, sulfuric acid, potassium chromate, barium nitrate, phosphoric acid, hydrochloric acid, lead nitrate, sodium hydroxide, and sodium carbonate. Suggest how you might prepare the following pure substances using these reagents and any normal laboratory equipment. If it is not possible to prepare a substance using these reagents, indicate why. $$ \mathrm{Na}_2 \mathrm{SO}_4(s) $$
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A, B, C, D
(Childhood communicable diseases requiring strict transmission-based precautions (Contact, Airborne, and Droplet Precautions) include diphtheria, chickenpox, measles, mumps, tuberculosis, adenovirus, Haemophilus influenzae type B, mumps, pertussis, plague, streptococcal pharyngitis, and scarlet fever. Strict isolation is not required for parvovirus B19.)
A, B, D
(To promote imaginative play for a 3-year-old child, the nurse should provide: dress-up clothes, dolls and dollhouses, housekeeping toys, play-store toys, telephones, farm animals and equipment, village sets, trains, trucks, cars, planes, hand puppets, and medical kits. A 100-piece jigsaw puzzle and a jump rope would be appropriate for a young, school-age child but not a 3-year-old child.)
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(2-7 y/o)
predominant characteristic is egocentrism (inability to put self in place of another)
-Interpret objects, events in terms of relationships or use to them
-Unable to see things from any perspective other than own, cant see other POV (or any reason to do so)
-Thinking = concrete + tangible
-Can't reason beyond observable, lack ability to make deductions/ generalizations
-Thought dominated by what they see, hear, otherwise experience
-Increasingly able to use language, symbols to represent objects in environment
-Elaborate concepts, make simple associations btw ideas through imaginative play, questioning, other interactions
-Latter stage of period = intuitive (ie stars go to bed like the child does), beginning to deal w/ problems of weight, length, size, time
-Also transductive reasoning→ bc 2 events occur together- they cause e/o or knowledge of one characteristic is transferred to another (ie all women w/ big bellies are pregnant)