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

What is radioactivity?

1. AThe release of radiation by unstable atomic nuclei
2. BThe glow produced by any hot object
3. CThe flow of electrons through a metal wire
4. DThe release of heat and light when fuels burn in air

Що з наведеного є сполукою?

1. AВуглекислий газ (CO₂)
2. BГелій (He)
3. CЗалізо (Fe)
4. DГазоподібний кисень (O₂)

What does the octet rule state?

1. AAn atom can form a maximum of 8 covalent bonds
2. BEvery stable molecule contains exactly 8 atoms
3. CAtoms tend to gain, lose or share electrons to get 8 outer electrons
4. DEvery stable atom has exactly 8 protons in its nucleus

A plastic block has a density of 0,8 g/cm³. What happens when it is placed in water (density 1,0 g/cm³)?

1. AIt sinks
2. BIt dissolves
3. CIt stays suspended halfway down
4. DIt floats

Which halogen is the most reactive?

1. AFluorine
2. BIodine
3. CBromine
4. DChlorine

Uranium-235 and uranium-238 both have 92 protons. How many more neutrons does an atom of uranium-238 have?

1. A146
2. B0
3. C3
4. D92

Why does a sodium ion (Na⁺) have almost the same mass as a sodium atom?

1. AThe ion has one fewer proton, which has a tiny mass
2. BIons and atoms always have exactly the same mass
3. CThe ion gains a neutron that balances the loss
4. DThe only difference is one electron, which has a tiny mass

Vitamin C is water-soluble and vitamin D is fat-soluble. What does this suggest about their molecules?

1. AVitamin C is nonpolar, while vitamin D is strongly polar
2. BBoth are equally polar
3. CVitamin C is polar, while vitamin D is mostly nonpolar
4. DBoth are ionic compounds