ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

In a chemical equation, what are the reactants?

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

According to the kinetic molecular theory, how do gas particles move?

1. AConstantly, randomly and in straight lines between collisions
2. BAlways in a single direction, set by the pull of gravity
3. COnly when heated, and then in neat lines between the walls
4. DSlowly in fixed positions

In a chemical reaction, what is the limiting reactant?

1. AThe reactant that is left over at the end
2. BThe catalyst that controls the speed
3. CThe reactant with the largest mass
4. DThe reactant that runs out first and stops the reaction

สารใดถูกออกซิไดซ์ในปฏิกิริยา 2Mg + O₂ → 2MgO

1. Aไม่มีสารใดเปลี่ยนประจุ
2. Bแมกนีเซียม เพราะสูญเสียอิเล็กตรอน
3. Cออกซิเจน เพราะสูญเสียอิเล็กตรอน
4. Dแมกนีเซียม เพราะรับอิเล็กตรอน

How does atomic radius change going down a group?

1. AIt stays the same
2. BIt decreases, then increases
3. CIt decreases
4. DIt increases

Which statement describes a saturated fat?

1. AIts fatty acid chains have no carbon–carbon double bonds
2. BIt contains no carbon atoms
3. CIts fatty acid chains have many carbon–carbon double bonds
4. DIt is always liquid at room temperature

A scuba diver breathes compressed air deep underwater. Why must the diver breathe out while swimming up to the surface?

1. AThe air in the lungs expands as the outside pressure falls
2. BOxygen turns to liquid at the surface
3. CThe water gets warmer near the surface
4. DThe air in the lungs shrinks as the outside pressure falls

A mixture contains sand, salt and water. Which sequence separates all three?

1. AFilter to remove the sand, then distil the filtrate to collect water and leave salt
2. BDistil first to remove the sand, then filter out the salt
3. CEvaporate all the water first, then filter the salt away from the dry sand
4. DUse a magnet to remove the salt, then filter the sand