Chemia na egzaminy wstępne na pielęgniarstwo: karta pracy z odpowiedziami

What does the octet rule state?

1. AAn atom can form a maximum of 8 covalent bonds
2. BEvery stable molecule contains exactly 8 atoms
3. CAtoms tend to gain, lose or share electrons to get 8 outer electrons
4. DEvery stable atom has exactly 8 protons in its nucleus

What is gamma radiation?

1. AA slow-moving electron
2. BA fast stream of protons from the nucleus
3. CHigh-energy electromagnetic radiation with no mass or charge
4. DA stream of helium nuclei with a positive charge

What is the chemical formula of carbon dioxide?

1. ACO
2. BC₂O
3. CCO₃
4. DCO₂

Which assumption is made about an ideal gas?

1. AIts particles lose energy in every collision
2. BIts particles are large, closely packed and strongly attracted
3. CIts particles stay still at room temperature
4. DIts particles have no attraction to each other

What is the formula of sodium sulfate, made from Na⁺ and SO₄²⁻ ions?

1. ANaSO₄
2. BNa₄SO₂
3. CNa(SO₄)₂
4. DNa₂SO₄

A reaction is at equilibrium. More of one reactant is added. According to Le Chatelier's principle, what happens?

1. AThe equilibrium shifts toward the products
2. BThe equilibrium shifts toward the reactants
3. CThe reaction stops completely
4. DNothing changes

Which phase change absorbs energy from the surroundings (is endothermic)?

1. ADeposition
2. BSublimation
3. CFreezing
4. DCondensation

A gas occupies 4 L at 2 atm and 200 K. What is its volume at 1 atm and 400 K?

1. A1 L
2. B4 L
3. C8 L
4. D16 L