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Elements in the same period of the periodic table have the same number of what?

1. AOccupied electron shells
2. BValence electrons
3. CProtons
4. DNeutrons

Manakah berikut ini yang merupakan perubahan kimia?

1. AEs mencair
2. BKaca pecah
3. CKayu terbakar
4. DGula larut dalam teh

Where are the metalloids found on the periodic table?

1. AIn the two separate rows at the bottom of the table
2. BIn group 1, at the far left edge of the table
3. CAlong the staircase line between the metals and the nonmetals
4. DIn group 18, at the far right edge of the table

Which statement describes a saturated fat?

1. AIts fatty acid chains have many carbon–carbon double bonds
2. BIt is always liquid at room temperature
3. CIts fatty acid chains have no carbon–carbon double bonds
4. DIt contains no carbon atoms

How many grams are in 2,5 kg?

1. A2500 g
2. B0,0025 g
3. C250 g
4. D25 g

How many oxygen atoms are in one formula unit of calcium nitrate, Ca(NO₃)₂?

1. A2
2. B6
3. C3
4. D5

A sealed bag of crisps (potato chips) packed at sea level looks puffed up when it is carried to a high mountain. Why?

1. AThe outside air pressure is lower, so the gas inside expands
2. BThe bag becomes thinner and weaker at altitude
3. CThe gas inside the bag is heated strongly by the mountain sunlight
4. DMore gas is produced by the crisps at altitude

Glucose (C₆H₁₂O₆) and fructose (C₆H₁₂O₆) join by a condensation reaction to form sucrose. What is the formula of sucrose?

1. AC₁₂H₂₀O₁₀
2. BC₁₂H₂₄O₁₂
3. CC₁₂H₂₂O₁₁
4. DC₆H₁₂O₆