Cevaplı Hemşirelik giriş sınavları için kimya çalışma kâğıdı

Which electrons take part in chemical bonding?

1. AAll electrons take part equally
2. BThe valence (outermost) electrons
3. COnly the electrons in the first shell
4. DThe electrons closest to the nucleus

In a chemical reaction, what is the limiting reactant?

1. AThe reactant that runs out first and stops the reaction
2. BThe reactant that is left over at the end
3. CThe catalyst that controls the speed
4. DThe reactant with the largest mass

How does increasing the concentration of a reactant in solution usually affect the reaction rate?

1. AThe rate stays the same
2. BThe reaction stops
3. CThe rate decreases
4. DThe rate increases

Radioactive iodine (iodine-131) is used to treat some thyroid conditions. Why does it reach the thyroid?

1. AIodine is strongly attracted to the metal ions stored in the neck
2. BRadiation is always drawn toward the head
3. CThe thyroid gland takes up iodine to make its hormones
4. DIodine-131 is not radioactive inside the body

What charge do group 16 elements such as oxygen and sulfur usually have as ions?

1. A6+
2. B2+
3. C2−
4. D1−

In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which species loses electrons?

1. ACu²⁺
2. BCu
3. CZn
4. DZn²⁺

How many atoms in total are in 0,5 mol of water, H₂O?

1. A6,02 × 10²³
2. B1,81 × 10²⁴
3. C9,03 × 10²³
4. D3,01 × 10²³

Equal masses of sand and water sit in the sun and absorb the same amount of heat. Which warms up more, and why?

1. ABoth warm equally, because they absorbed the same heat
2. BWater, because it has a higher specific heat capacity than sand
3. CSand, because it has a higher specific heat capacity than water
4. DSand, because it has a lower specific heat capacity than water