Cevaplı Hemşirelik giriş sınavları için kimya çalışma kâğıdı

What does the law of conservation of mass state?

1. AThe mass of products is always greater than the mass of reactants
2. BMass is neither created nor destroyed in a chemical reaction
3. CMass is lost as heat in every reaction
4. DGases have no mass

What is a molecule?

1. ATwo or more atoms held together by covalent bonds
2. BA single atom with a positive charge
3. CThe nucleus of an atom
4. DA mixture of two different elements

What is absolute zero?

1. A0 °F, the temperature of a salt and ice mixture
2. B0 K, about −273 °C, the lowest possible temperature
3. C−100 °C, the coldest temperature on Earth
4. D0 °C, the point at which pure water freezes into ice

Which substance is a non-electrolyte when dissolved in water?

1. APotassium chloride
2. BSodium chloride
3. CHydrochloric acid
4. DGlucose

What percentage of the mass of water (H₂O, 18 g/mol) is hydrogen (H = 1 g/mol)?

1. AAbout 67%
2. BAbout 11%
3. CAbout 5,6%
4. DAbout 89%

Soy gazlar neden nadiren tepkime verir?

1. AHepsi radyoaktiftir
2. BAtomları diğer atomlardan çok daha büyüktür
3. CDış elektron kabukları zaten doludur
4. DHiç elektronları yoktur

Why are the radioactive tracers used for medical imaging usually chosen to have short half-lives?

1. AThey stay active for many years, so a single dose can be used for every future scan
2. BThey give a strong signal for imaging but leave the body's tissues exposed only briefly
3. CShort half-life isotopes are not radioactive
4. DThey emit only alpha particles, which are harmless inside the body

Which substance has the lowest boiling point?

1. AHelium
2. BSodium chloride
3. CIron
4. DWater