Робочий аркуш «Хімія для вступних іспитів на медсестринство» з відповідями

Що показує атомний номер елемента?

1. AЗагальну кількість протонів і нейтронів у ядрі
2. BКількість протонів у кожному атомі
3. CКількість нейтронів у кожному атомі
4. DКількість атомів в одному молі елемента

What are the units of molarity?

1. AGrams of solute per litre of solution (g/L)
2. BMoles of solute per litre of solution (mol/L)
3. CMoles of solute per kilogram of the solvent used
4. DGrams of solute per 100 g of solution

What is the half-life of a radioactive isotope?

1. AThe time taken for the mass of a sample to double in size
2. BHalf the number of protons in the nucleus
3. CHalf the time it takes for all the atoms to decay
4. DThe time taken for half of the radioactive atoms in a sample to decay

What is the oxidation number of an element in its uncombined (elemental) form, such as Fe or O₂?

1. A+1
2. B0
3. CIt equals the group number
4. D−1

When two monomers join to form a larger molecule and a water molecule is released, what is the reaction called?

1. ANeutralisation
2. BHydrolysis (splitting with water)
3. CCondensation (dehydration synthesis)
4. DCombustion

Why does stirring help a solid dissolve faster?

1. AIt raises the temperature of the solvent by friction a great deal
2. BIt increases the amount of solute that can dissolve in total
3. CIt turns the solid into a liquid
4. DIt brings fresh solvent into contact with the solid's surface

Which list puts 0,1 M solutions of HCl, acetic acid (CH₃COOH) and NaCl in order of increasing pH?

1. ANaCl < CH₃COOH < HCl
2. BCH₃COOH < HCl < NaCl
3. CHCl < NaCl < CH₃COOH
4. DHCl < CH₃COOH < NaCl

Which statement correctly distinguishes a scientific law from a scientific theory?

1. AA law is only a guess, while a theory is a proven fact
2. BA law describes what happens; a theory explains why it happens
3. CA theory becomes a law once it is proved
4. DLaws apply only to chemistry, theories only to biology