Cevaplı Hemşirelik giriş sınavları için kimya çalışma kâğıdı

Which property is typical of bases?

1. AThey feel slippery
2. BThey taste sour
3. CThey have a pH below 7
4. DThey turn blue litmus red

Which element exists naturally as diatomic molecules (two atoms joined together)?

1. AHelium
2. BIron
3. COxygen
4. DSodium

What does the prefix "milli-" mean?

1. AOne thousand (10³)
2. BOne-hundredth (10⁻²)
3. COne-thousandth (10⁻³)
4. DOne-millionth (10⁻⁶)

Why can a very high fever disrupt the body's chemical reactions?

1. AHigh temperatures turn enzymes into fats
2. BHigh temperatures make every enzyme work faster without any limit
3. CHigh temperatures remove the water from blood
4. DHigh temperatures can change the shape of enzymes so they stop working

What is nuclear fission?

1. AThe splitting of a heavy nucleus into smaller nuclei
2. BThe loss of electrons from an atom
3. CThe burning of uranium in oxygen
4. DThe joining of two light nuclei to form a heavier nucleus

Why does water boil at a lower temperature at the top of a high mountain?

1. AGravity is weaker, so the molecules escape more easily
2. BThe air pressure is lower, so less vapour pressure is needed to boil
3. CThere is less oxygen dissolved in the water up there
4. DThe air is colder, so the water loses heat and boils sooner

A reaction at equilibrium has a very large equilibrium constant (K much greater than 1). What does this tell you?

1. AThe reaction is very fast
2. BAt equilibrium, the mixture contains mostly products
3. CAt equilibrium, the mixture contains mostly reactants
4. DThe reaction cannot reach equilibrium

How many grams of NaCl are in 250 mL of 0,9% (w/v) normal saline?

1. A9 g
2. B0,9 g
3. C22,5 g
4. D2,25 g