정답이 있는 간호학 입학 시험 대비 화학 학습지

What is absolute zero?

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

What is the melting point of a substance?

1. AThe temperature at which its solid turns into a liquid
2. BThe temperature at which it catches fire
3. CThe temperature at which its liquid turns into a gas
4. DThe temperature at which it dissolves in water

What is radioactivity?

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

A reaction is at equilibrium. More of one reactant is added. According to Le Chatelier's principle, what happens?

1. AThe reaction stops completely
2. BNothing changes
3. CThe equilibrium shifts toward the reactants
4. DThe equilibrium shifts toward the products

A room is at 25 °C. What is this temperature in kelvin?

1. A−248 K
2. B248 K
3. C77 K
4. D298 K

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

1. ACu
2. BZn²⁺
3. CCu²⁺
4. DZn

Which list puts fluorine, chlorine and bromine in order of increasing electronegativity?

1. AF < Cl < Br
2. BCl < Br < F
3. CBr < F < Cl
4. DBr < Cl < F

A strip of magnesium is burned in air and the white ash weighs more than the original strip. Why?

1. AMagnesium atoms became heavier when heated
2. BMass was created during the reaction
3. COxygen from the air has combined with the magnesium
4. DThe ash absorbed water from the flame