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

1. ACondensation
2. BFreezing
3. CDeposition
4. DSublimation

Apa sebutan untuk perubahan dari cair menjadi gas?

1. APelelehan
2. BPembekuan
3. CPenguapan
4. DPengembunan

What is the name for the attraction of water molecules to each other?

1. AOsmosis
2. BCohesion
3. CAdhesion
4. DDiffusion

In a reaction at equilibrium, a product is continuously removed. What happens?

1. AThe equilibrium shifts to the left to form more reactants
2. BThe reaction rate drops to zero
3. CMore product keeps forming as the equilibrium shifts to the right
4. DThe reactants run out immediately

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

1. A1 × 10⁻² mol/L
2. B1 × 10⁻¹² mol/L
3. C2 mol/L
4. D1 × 10² mol/L

A reaction is at equilibrium. More of one reactant is added. According to Le Chatelier's principle, what happens?

1. AThe equilibrium shifts toward the products
2. BThe equilibrium shifts toward the reactants
3. CThe reaction stops completely
4. DNothing changes

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

1. ANeutrons push the electrons outward less strongly
2. BEach element adds a new electron shell
3. CMore protons pull the electrons of the same outer shell closer
4. DThe atoms lose electrons across the period

At the top of a high mountain, air still contains about 21% oxygen. Why do climbers still get less oxygen with each breath?

1. AThe percentage of oxygen in the air falls sharply as you climb higher
2. BThe total air pressure is lower, so the partial pressure of oxygen is lower
3. COxygen is heavier, so it all sinks to sea level
4. DCold air contains no oxygen