ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is plasma, as a state of matter?

1. AA very hot gas in which atoms have lost electrons and become ions
2. BA solid that conducts electricity
3. CThe liquid part of blood
4. DA liquid that has been cooled below its freezing point

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

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

ข้อใดต่อไปนี้เป็นการเปลี่ยนแปลงทางกายภาพ

1. Aเหล็กเป็นสนิม
2. Bนมบูด
3. Cน้ำเดือดกลายเป็นไอน้ำ
4. Dขนมปังปิ้งจนเป็นสีน้ำตาล

When diluting a concentrated acid, which method is safe?

1. AAdd the water slowly to the acid
2. BAdd the water quickly to the acid
3. CMix them in any order, as long as it is fast
4. DAdd the acid slowly to the water

Normal saline (0.9% NaCl) is used for IV fluids. How is it described compared with blood?

1. ASaturated
2. BHypertonic
3. CIsotonic
4. DHypotonic

Rubbing alcohol evaporates faster than water at room temperature. What does this suggest?

1. AIts molecules are heavier than water molecules
2. BIts intermolecular forces are stronger than water's
3. CIt has a higher boiling point than water
4. DIts intermolecular forces are weaker than water's

Vitamin C is water-soluble and vitamin D is fat-soluble. What does this suggest about their molecules?

1. ABoth are ionic compounds
2. BBoth are equally polar
3. CVitamin C is polar, while vitamin D is mostly nonpolar
4. DVitamin C is nonpolar, while vitamin D is strongly polar

Methane burns as CH₄ + 2O₂ → CO₂ + 2H₂O. What mass of CO₂ (44 g/mol) forms from 16 g of CH₄ (16 g/mol)?

1. A88 g
2. B16 g
3. C44 g
4. D22 g