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Air garam adalah contoh jenis materi apa?

1. ACampuran heterogen
2. BUnsur murni
3. CSenyawa
4. DCampuran homogen (larutan)

About what percentage of dry air is oxygen?

1. A1%
2. B78%
3. C50%
4. D21%

What is the change from a gas directly to a solid, skipping the liquid state, called?

1. ACondensation
2. BFreezing
3. CSublimation
4. DDeposition

A reaction has ΔH = −890 kJ/mol. What does the negative sign tell you?

1. AThe reaction is at equilibrium
2. BThe reaction is endothermic
3. CThe reaction needs a catalyst
4. DThe reaction is exothermic

A solution has a pH of 2. What is its hydrogen ion concentration?

1. A2 mol/L
2. B1 × 10² mol/L
3. C1 × 10⁻¹² mol/L
4. D1 × 10⁻² mol/L

When a nucleus emits a beta particle, how do its mass number and atomic number change?

1. ABoth fall by 1
2. BMass number falls by 4 and atomic number falls by 2
3. CMass number stays the same and atomic number rises by 1
4. DMass number rises by 1 and atomic number stays the same

Which statement correctly distinguishes a scientific law from a scientific theory?

1. AA law is only a guess, while a theory is a proven fact
2. BA law describes what happens; a theory explains why it happens
3. CLaws apply only to chemistry, theories only to biology
4. DA theory becomes a law once it is proved

Which element has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁵?

1. AFluorine
2. BChlorine
3. CArgon
4. DSulfur