ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

ข้อใดต่อไปนี้เป็นการเปลี่ยนแปลงทางกายภาพ

1. Aเหล็กเป็นสนิม
2. Bขนมปังปิ้งจนเป็นสีน้ำตาล
3. Cน้ำเดือดกลายเป็นไอน้ำ
4. Dนมบูด

Which mixture is a suspension?

1. ASand stirred into water
2. BSugar dissolved in water
3. CSalt dissolved in water
4. DOxygen dissolved in water

In a chemical equation, what are the reactants?

1. AThe catalysts written above the arrow
2. BThe numbers written in front of each formula
3. CThe starting substances, written to the left of the arrow
4. DThe new substances formed, written to the right of the arrow

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

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

Zn + 2HCl → ZnCl₂ + H₂ เป็นปฏิกิริยาชนิดใด

1. Aการแทนที่คู่
2. Bการสังเคราะห์
3. Cการแทนที่เดี่ยว
4. Dการสลายตัว

When the diaphragm contracts and the chest cavity gets bigger, what happens to the air pressure inside the lungs?

1. AIt falls, so air flows in
2. BIt does not change
3. CIt falls, so air flows out
4. DIt rises, so air flows in

Why is Dmitri Mendeleev's early periodic table regarded as such a success?

1. AHe proved that the atoms of every element contain electrons
2. BHe discovered the noble gases and placed them in group 18
3. CHe arranged the elements by atomic number, which he had discovered
4. DHe left gaps and correctly predicted the properties of elements not yet discovered

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

1. ABr < F < Cl
2. BF < Cl < Br
3. CBr < Cl < F
4. DCl < Br < F