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What does the octet rule state?

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

Jenis ikatan apa yang terbentuk bila elektron dipakai bersama antaratom?

1. AIkatan logam
2. BIkatan ion
3. CIkatan kovalen
4. DIkatan nuklir

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

1. ASublimation
2. BFreezing
3. CDeposition
4. DCondensation

Magnesium forms Mg²⁺ ions and oxygen forms O²⁻ ions. What is the formula of magnesium oxide?

1. AMg₂O₂
2. BMgO₂
3. CMg₂O
4. DMgO

What does Avogadro's law state?

1. AEqual volumes of gases at the same temperature and pressure contain equal numbers of molecules
2. BOne mole of any gas has a mass of 22,4 g
3. CThe pressure of a gas doubles when its temperature is halved
4. DEqual masses of all gases contain equal numbers of molecules under any conditions

Apa yang terjadi pada suhu air es selama es mencair?

1. ALangsung naik sampai 100 °C
2. BTurun di bawah 0 °C
3. CTetap pada 0 °C sampai semua es mencair
4. DNaik terus-menerus selama itu

Which phrase best describes a 0,001 M solution of hydrochloric acid?

1. AA dilute solution of a weak acid
2. BA dilute solution of a strong acid
3. CA concentrated solution of a weak acid
4. DA concentrated solution of a strong acid

Why does atomic radius decrease from left to right across a period?

1. AMore protons pull the electrons of the same outer shell closer
2. BThe atoms lose electrons across the period
3. CEach element adds a new electron shell
4. DNeutrons push the electrons outward less strongly