ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

ธาตุในตารางธาตุสมัยใหม่เรียงลำดับตามอะไร

1. Aตัวอักษรของสัญลักษณ์ตามลำดับพจนานุกรม
2. Bเลขอะตอมที่เพิ่มขึ้น
3. Cวันที่ค้นพบ
4. Dจำนวนนิวตรอนที่เพิ่มขึ้น

What is the term for anything that has mass and takes up space?

1. AEnergy
2. BHeat
3. CMatter
4. DForce

What is radioactivity?

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

How does a catalyst speed up a reaction?

1. AIt adds extra reactant to the mixture
2. BIt provides a different pathway with a lower activation energy
3. CIt raises the temperature of the reactants so they move faster
4. DIt makes the reaction more exothermic

A patient's arterial blood pH is 7.25. How is this described?

1. ANeutral
2. BNormal
3. CAlkalosis
4. DAcidosis

Which is larger, a sodium atom (Na) or a sodium ion (Na⁺)?

1. AThe sodium atom
2. BIt depends on the temperature
3. CThey are the same size
4. DThe sodium ion

A piece of copper is placed in zinc sulfate solution. Zinc is more reactive than copper. What happens?

1. ACopper replaces zinc, forming copper sulfate
2. BNo reaction occurs
3. CHydrogen gas is produced
4. DZinc metal coats the copper and the solution turns blue

Diamond is extremely hard and has a very high melting point. Which explanation is correct?

1. AIt contains delocalised electrons like a metal
2. BIt is made of separate small molecules with strong forces between them
3. CIt is held together by ionic bonds between C⁺ and C⁻ ions
4. DEach carbon is covalently bonded to four others in a giant network