ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

Which type of radiation is the most penetrating?

1. AAlpha particles
2. BBeta particles
3. CThey are all equally penetrating
4. DGamma rays

What is the half-life of a radioactive isotope?

1. AHalf the time it takes for all the atoms to decay
2. BHalf the number of protons in the nucleus
3. CThe time taken for half of the radioactive atoms in a sample to decay
4. DThe time taken for the mass of a sample to double in size

Which gas is needed for a fuel to burn (combustion)?

1. ACarbon dioxide
2. BOxygen
3. CNitrogen
4. DHelium

Which of these is a colloid?

1. AMilk
2. BSalt water
3. CSand in water
4. DPure water

Nitrogen is in group 15 of the periodic table. How many valence electrons does a nitrogen atom have?

1. A7
2. B3
3. C5
4. D15

Which halogen is the most reactive?

1. AChlorine
2. BIodine
3. CFluorine
4. DBromine

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

Which compound contains both ionic and covalent bonds?

1. AWater, H₂O
2. BSodium sulfate, Na₂SO₄
3. CMethane, CH₄
4. DSodium chloride, NaCl