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What is an empirical formula?

1. AThe mass of one mole of a compound
2. BA drawing of how the atoms are bonded
3. CThe actual number of each atom in one molecule
4. DThe simplest whole-number ratio of atoms in a compound

Berapa pH air murni pada 25 °C?

1. A14
2. B0
3. C7
4. D1

What is the half-life of a radioactive isotope?

1. AThe time taken for half of the radioactive atoms in a sample to decay
2. BHalf the number of protons in the nucleus
3. CThe time taken for the mass of a sample to double in size
4. DHalf the time it takes for all the atoms to decay

Senyawa apa yang terbentuk antara kalsium (Ca²⁺) dan klorin (Cl⁻)?

1. ACaCl
2. BCa₂Cl
3. CCaCl₂
4. DCa₂Cl₃

What is the name of the molecular compound CO?

1. ACarbon oxide
2. BCarbon dioxide
3. CMonocarbon oxide
4. DCarbon monoxide

Which measurement has three significant figures?

1. A56
2. B5,0006
3. C0,0056
4. D0,00560

CO₂ in blood forms carbonic acid: CO₂ + H₂O ⇌ H₂CO₃ ⇌ H⁺ + HCO₃⁻. An anxious patient hyperventilates and breathes off extra CO₂. What happens to blood pH?

1. AIt falls, because less CO₂ means more H⁺ ions
2. BIt stays exactly 7,40, because CO₂ does not affect pH
3. CIt rises, because less CO₂ means fewer H⁺ ions
4. DIt falls, because oxygen is an acid

Suatu zat meleleh pada 801 °C, tidak menghantarkan listrik sebagai padatan tetapi menghantarkan saat lebur. Zat jenis apa yang paling mungkin?

1. AGas mulia
2. BZat kovalen sederhana (molekuler)
3. CLogam
4. DSenyawa ionik