ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What does the rate of a reaction measure?

1. AHow hot the reaction gets
2. BHow quickly reactants are used up or products are formed
3. CHow much product forms in total by the end
4. DHow much energy the final products contain

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

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

What does the double arrow (⇌) in a chemical equation show?

1. AThe reaction is reversible
2. BThe reaction is very fast
3. CThe reaction needs a catalyst
4. DThe reaction releases heat

For the gas reaction N₂ + 3H₂ ⇌ 2NH₃, what is the effect of increasing the pressure?

1. AThe NH₃ breaks down completely
2. BThe equilibrium shifts to the right, toward NH₃
3. CThere is no effect on the equilibrium
4. DThe equilibrium shifts to the left, toward N₂ and H₂

What is 380 mmHg in atmospheres?

1. A2 atm
2. B380 atm
3. C0.5 atm
4. D0.38 atm

Nitrogen is in group 15 of the periodic table. How many valence electrons does a nitrogen atom have?

1. A7
2. B5
3. C3
4. D15

A nurse wipes a patient's arm with an alcohol swab and the patient says the skin feels cold. What explains this?

1. AThe alcohol absorbs heat from the skin as it evaporates
2. BThe alcohol reacts with the skin in an endothermic chemical reaction
3. CThe alcohol blocks the skin's nerve endings for warmth
4. DThe alcohol is stored at a much lower temperature than the room

What fraction of a radioactive isotope remains after three half-lives?

1. A1/8
2. B1/9
3. C1/6
4. D1/3