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1. Makkelijk
Which of these is a polyatomic ion?
A Sulfate, SO₄²⁻ B Sodium, Na⁺ C Oxide, O²⁻ D Chloride, Cl⁻ 2. Makkelijk
What does the rule "like dissolves like" mean?
A Every substance dissolves in water B Solids dissolve only in other solids C Polar solvents dissolve polar substances, and nonpolar solvents dissolve nonpolar ones D Only substances with identical formulas can ever dissolve in each other 3. Makkelijk
How does increasing the concentration of a reactant in solution usually affect the reaction rate?
A The rate decreases B The rate increases C The rate stays the same D The reaction stops 4. Gemiddeld
Welke coëfficiënten maken de vergelijking __H₂ + __O₂ → __H₂O kloppend?
A 2, 2, 2 B 2, 1, 2 C 1, 2, 1 D 1, 1, 1 5. Gemiddeld
How should the volume of water in a graduated cylinder be read?
A From above the cylinder, at the top edge of the curved surface B At eye level, from the bottom of the curved surface (meniscus) C At any angle, from the middle of the cylinder D From below, at the highest point the water touches the glass 6. Gemiddeld
Which statement describes a saturated fat?
A Its fatty acid chains have no carbon–carbon double bonds B It is always liquid at room temperature C It contains no carbon atoms D Its fatty acid chains have many carbon–carbon double bonds 7. Moeilijk
An element in period 3 forms an oxide with the formula X₂O₃. Which element is X?
A Magnesium B Aluminium C Sodium D Phosphorus 8. Moeilijk
A sealed rigid can holds gas at 2 atm and 27 °C. It is heated to 327 °C. What is the new pressure?
A 2,4 atm B 24 atm C 1 atm D 4 atm
Antwoordenblad 1. A · Sulfate, SO₄²⁻2. C · Polar solvents dissolve polar substances, and nonpolar solvents dissolve nonpolar ones3. B · The rate increases4. B · 2, 1, 25. B · At eye level, from the bottom of the curved surface (meniscus)6. A · Its fatty acid chains have no carbon–carbon double bonds7. B · Aluminium8. D · 4 atmVolledige stapsgewijze oplossingen: oefen dit onderwerp op examproblems.com.