Робочий аркуш «Хімія для вступних іспитів на медсестринство» з відповідями

In a chemical equation, what does the symbol (aq) after a formula mean?

1. AA solid
2. BDissolved in water
3. CA gas
4. DA pure liquid

What does the coefficient 3 in "3H₂O" mean?

1. AEach water molecule has three oxygen atoms
2. BWater has a charge of 3
3. CThere are three molecules (or moles) of water
4. DEach molecule of water contains three hydrogen atoms

What do the letters STP stand for in gas chemistry?

1. ASpecific temperature and particles
2. BStandard time and pressure
3. CStandard temperature and pressure
4. DStable temperature point

Potassium forms K⁺ ions and sulfur forms S²⁻ ions. What is the name and formula of their compound?

1. APotassium sulfite, KS
2. BPotassium sulfide, K₂S
3. CPotassium sulfate, K₂SO₄
4. DPotassium sulfide, KS₂

What is the oxidation number of an element in its uncombined (elemental) form, such as Fe or O₂?

1. A0
2. B+1
3. C−1
4. DIt equals the group number

Which nuclear process powers the Sun?

1. ACombustion of hydrogen gas with oxygen in its core
2. BAlpha decay of helium
3. CFission of uranium into smaller nuclei
4. DFusion of hydrogen nuclei to form helium

2090 J of heat is added to 50 g of water (specific heat 4,18 J/g·°C). By how much does its temperature rise?

1. A5 °C
2. B41,8 °C
3. C20 °C
4. D10 °C

Many ethene (C₂H₄) molecules join together to form poly(ethene), a plastic. What type of reaction is this?

1. ACondensation polymerisation, in which a water molecule is released at each new link
2. BHydrolysis, in which water breaks each monomer apart
3. CAddition polymerisation, in which the C=C double bonds open up to link the monomers
4. DCombustion, in which ethene reacts with oxygen