ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is radioactivity?

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

Apart from mercury, which element is a liquid at room temperature?

1. AIodine
2. BSodium
3. CChlorine
4. DBromine

เลขอะตอมของธาตุบอกอะไร

1. Aจำนวนนิวตรอนในแต่ละอะตอม
2. Bจำนวนอะตอมในธาตุหนึ่งโมล
3. Cจำนวนโปรตอนในแต่ละอะตอม
4. Dจำนวนรวมของโปรตอนและนิวตรอนในนิวเคลียส

What percentage of the mass of water (H₂O, 18 g/mol) is hydrogen (H = 1 g/mol)?

1. AAbout 5.6%
2. BAbout 11%
3. CAbout 89%
4. DAbout 67%

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

1. AHypotonic
2. BSaturated
3. CHypertonic
4. DIsotonic

When diluting a concentrated acid, which method is safe?

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

A salt is dissolved in water in an insulated cup, and the water temperature falls from 25 °C to 20 °C. Which statement is correct?

1. ADissolving is exothermic; the dissolving salt released heat into the water
2. BNo energy change occurred, because the temperature fell
3. CDissolving is endothermic; the water took heat from the salt
4. DDissolving is endothermic; the dissolving salt took heat from the water

แก๊สอยู่ที่ 1 atm ในภาชนะ 6 L ที่อุณหภูมิเดิม อัดให้เหลือ 2 L ความดันใหม่คือเท่าใด

1. A0.33 atm
2. B3 atm
3. C4 atm
4. D12 atm