Lembar kerja Kimia untuk ujian masuk keperawatan dengan jawaban

Dalam larutan garam, apa sebutan untuk garamnya?

1. AEndapan
2. BPelarut
3. CZat terlarut
4. DKatalis

What is a beta particle?

1. AA wave of visible light
2. BA helium nucleus with two protons and two neutrons
3. CA high-energy electron released from a nucleus
4. DA neutron that leaves the nucleus

Which two substances must be present for iron to rust?

1. AOxygen and water
2. BCarbon dioxide and salt
3. CNitrogen and water
4. DHydrogen and oxygen gas only

What is the molar mass of sodium chloride, NaCl (Na = 23, Cl = 35,5 g/mol)?

1. A81,5 g/mol
2. B12,5 g/mol
3. C58,5 g/mol
4. D23 g/mol

Water has a high specific heat capacity. How does this help the human body?

1. AIt makes water a poor solvent for salts
2. BIt allows oxygen to dissolve in water more easily
3. CIt helps keep body temperature stable
4. DIt makes the blood more acidic

Why does keeping food in a refrigerator slow down spoilage?

1. ALower temperatures slow down chemical and microbial reactions
2. BCold air contains no oxygen
3. CLower temperatures raise the activation energy of every reaction
4. DCold temperatures add preservatives to the food

Why is gamma radiation used to sterilise sealed medical supplies such as syringes?

1. AIt passes through the packaging and kills microbes without making the items radioactive
2. BIt adds a protective chemical coating to the items
3. CIt heats the items to very high temperatures, so the microbes are burned away inside the pack
4. DIt is stopped by the packaging, so it only cleans the outside

Carbon-12 and carbon-14 react in exactly the same way in chemical reactions. Why?

1. ACarbon-14 turns into carbon-12 before reacting
2. BThey have the same mass number
3. CThey have the same number of protons and electrons
4. DThey have the same number of neutrons