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Which three elements make up carbohydrates?

1. ACarbon, hydrogen and oxygen
2. BCarbon, nitrogen and sulfur
3. CHydrogen, nitrogen and phosphorus
4. DCarbon, hydrogen and nitrogen

Which group contains the alkaline earth metals, such as magnesium and calcium?

1. AGroup 17
2. BGroup 1
3. CGroup 2
4. DGroup 18

What does the prefix "milli-" mean?

1. AOne-millionth (10⁻⁶)
2. BOne-thousandth (10⁻³)
3. COne-hundredth (10⁻²)
4. DOne thousand (10³)

In a closed container, 10 g of substance A reacts completely with 5 g of substance B. What is the total mass of the products?

1. A10 g
2. B5 g
3. C50 g
4. D15 g

Pernyataan mana yang menggambarkan asam kuat?

1. AHanya sebagian melepaskan ion hidrogen
2. BSelalu sangat pekat
3. CMemiliki pH di atas 7
4. DTerionisasi sempurna dalam air

How should the volume of water in a graduated cylinder be read?

1. AAt any angle, from the middle of the cylinder
2. BFrom above the cylinder, at the top edge of the curved surface
3. CFrom below, at the highest point the water touches the glass
4. DAt eye level, from the bottom of the curved surface (meniscus)

Olive oil is liquid at room temperature, while butter is solid. Which explanation is correct?

1. AOlive oil molecules are ionic, while butter molecules are covalent
2. BButter contains more water, which freezes at room temperature
3. COlive oil has no C=C double bonds, so its chains stay straight and pack tightly
4. DOlive oil has more C=C double bonds, which kink the chains so they cannot pack closely

Which compound contains both ionic and covalent bonds?

1. AWater, H₂O
2. BMethane, CH₄
3. CSodium sulfate, Na₂SO₄
4. DSodium chloride, NaCl