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What is radioactivity?

1. AThe glow produced by any hot object
2. BThe release of heat and light when fuels burn in air
3. CThe release of radiation by unstable atomic nuclei
4. DThe flow of electrons through a metal wire

Which method separates two liquids with different boiling points, such as alcohol and water?

1. ADistillation
2. BFiltration
3. CUsing a magnet
4. DSieving

What is an acid–base indicator?

1. AA gas given off by acids
2. BA substance that neutralises every acid
3. CA substance that changes colour depending on pH
4. DA device that measures temperature

Sebuah atom magnesium melepaskan dua elektron. Ion apa yang terbentuk?

1. AMg⁻
2. BMg²⁻
3. CMg⁺
4. DMg²⁺

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 reactants run out immediately
3. CThe reaction rate drops to zero
4. DMore product keeps forming as the equilibrium shifts to the right

How does dissolving salt in water affect the water's boiling point?

1. AIt lowers the boiling point slightly
2. BIt makes the water boil at room temperature
3. CIt raises the boiling point slightly
4. DIt has no effect on the boiling point

A solution of a strong acid has pH 2. It is diluted with water to 10 times its original volume. What is the new pH?

1. A1
2. B20
3. C3
4. D0,2

The true volume in a flask is 10,0 mL. A student measures it three times and gets 8,1 mL, 8,1 mL and 8,2 mL. How are these results best described?

1. AAccurate but not precise
2. BBoth accurate and precise
3. CPrecise but not accurate
4. DNeither accurate nor precise