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Apa itu isotop?

1. AAtom dari unsur yang berbeda dengan jumlah neutron yang sama
2. BIon yang telah menerima elektron
3. CAtom dari unsur yang sama dengan jumlah proton yang berbeda
4. DAtom dari unsur yang sama dengan jumlah neutron yang berbeda

Which property is typical of nonmetals?

1. AThey are poor conductors of heat and electricity
2. BThey easily lose electrons to form positive ions
3. CThey are shiny and easily bent into wires
4. DThey are all solids at room temperature

What does the double arrow (⇌) in a chemical equation show?

1. AThe reaction is very fast
2. BThe reaction is reversible
3. CThe reaction releases heat
4. DThe reaction needs a catalyst

Koefisien mana yang menyetarakan persamaan __H₂ + __O₂ → __H₂O?

1. A2, 2, 2
2. B2, 1, 2
3. C1, 1, 1
4. D1, 2, 1

Why is a carbon dioxide extinguisher effective on many fires?

1. ACO₂ is a liquid that soaks into the fuel
2. BCO₂ is denser than air and pushes oxygen away from the fire
3. CCO₂ reacts chemically with the fuel to make it non-flammable
4. DCO₂ adds oxygen to cool the flames

Ketika gas dipanaskan dalam wadah kaku yang tertutup, apa yang terjadi pada tekanannya?

1. ATetap sama
2. BTurun
3. CTurun menjadi nol
4. DNaik

Which pair of substances could form a buffer solution?

1. AHydrochloric acid (HCl) and chloride (Cl⁻)
2. BCarbonic acid (H₂CO₃) and bicarbonate (HCO₃⁻)
3. CSodium chloride (NaCl) and water
4. DHydrochloric acid (HCl) and sodium hydroxide (NaOH)

In the fission reaction ²³⁵U + ¹n → ¹⁴¹Ba + ⁹²Kr + ? ¹n, how many neutrons are released?

1. A2
2. B1
3. C4
4. D3