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What is the name of the polyatomic ion NH₄⁺?

1. AAmmonium
2. BAmmonia
3. CNitride
4. DNitrate

Where do the mole ratios used in stoichiometry come from?

1. AThe subscripts in each formula
2. BThe physical states of the substances
3. CThe molar masses of the reactants
4. DThe coefficients of the balanced equation

Klorin, bromin, dan iodin adalah contoh golongan apa?

1. AGas mulia
2. BHalogen
3. CLogam alkali
4. DLogam transisi

When diluting a concentrated acid, which method is safe?

1. AAdd the water slowly to the acid
2. BAdd the acid slowly to the water
3. CAdd the water quickly to the acid
4. DMix them in any order, as long as it is fast

What is nuclear fission?

1. AThe joining of two light nuclei to form a heavier nucleus
2. BThe loss of electrons from an atom
3. CThe splitting of a heavy nucleus into smaller nuclei
4. DThe burning of uranium in oxygen

When the diaphragm contracts and the chest cavity gets bigger, what happens to the air pressure inside the lungs?

1. AIt does not change
2. BIt falls, so air flows out
3. CIt rises, so air flows in
4. DIt falls, so air flows in

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

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

Mengapa air memiliki titik didih yang luar biasa tinggi untuk molekul sekecil itu?

1. AAir adalah senyawa ionik
2. BIkatan O–H-nya putus saat mendidih
3. CMolekulnya sangat berat
4. DIkatan hidrogen yang kuat antarmolekulnya harus diputus