Užduočių lapas tema Chemija slaugos stojamiesiems egzaminams su atsakymais

DNA belongs to which group of biological molecules?

1. ANucleic acids
2. BCarbohydrates
3. CLipids
4. DProteins

What is absolute zero?

1. A−100 °C, the coldest temperature on Earth
2. B0 K, about −273 °C, the lowest possible temperature
3. C0 °F, the temperature of a salt and ice mixture
4. D0 °C, the point at which pure water freezes into ice

A cleaning solution has a pH of 12. How is it described?

1. AWeakly acidic
2. BStrongly basic
3. CStrongly acidic
4. DNeutral

When mercury(II) oxide is heated, it reacts as 2HgO → 2Hg + O₂. What type of reaction is this?

1. ASynthesis
2. BDecomposition
3. CCombustion
4. DSingle replacement

Which property stays the same whether you have a small sample or a large sample of a pure substance?

1. ADensity
2. BMass
3. CVolume
4. DTotal heat content

Which coefficients balance __Na + __Cl₂ → __NaCl?

1. A2, 2, 1
2. B1, 2, 1
3. C2, 1, 2
4. D1, 1, 1

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

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

Na⁺, Mg²⁺, F⁻ and O²⁻ all have 10 electrons. Which ion is the largest?

1. AO²⁻
2. BMg²⁺
3. CF⁻
4. DNa⁺