ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is the change from a gas directly to a solid, skipping the liquid state, called?

1. ACondensation
2. BDeposition
3. CSublimation
4. DFreezing

What is radioactivity?

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

What is the smallest particle of an element that still has the chemical properties of that element?

1. AAn electron
2. BA proton
3. CA nucleus
4. DAn atom

What feature makes a hydrocarbon an alkene?

1. AOnly carbon–carbon single bonds
2. BAt least one carbon–carbon double bond
3. CA ring of six carbon atoms with no hydrogen
4. DAn –OH group

เมื่อให้ความร้อนแก๊สในภาชนะปิดแข็ง ความดันของแก๊สจะเป็นอย่างไร

1. Aลดลงเป็นศูนย์
2. Bเพิ่มขึ้น
3. Cคงเดิม
4. Dลดลง

A reaction has a theoretical yield of 20 g, but only 15 g of product is collected. What is the percent yield?

1. A133%
2. B25%
3. C5%
4. D75%

Magnesium burns as 2Mg + O₂ → 2MgO. What mass of MgO (40 g/mol) forms from 48 g of Mg (24 g/mol)?

1. A48 g
2. B80 g
3. C160 g
4. D40 g

A sealed rigid can holds gas at 2 atm and 27 °C. It is heated to 327 °C. What is the new pressure?

1. A4 atm
2. B2.4 atm
3. C1 atm
4. D24 atm