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Sebuah atom memiliki 6 proton, 6 neutron, dan 6 elektron. Berapa nomor massanya?

1. A18
2. B12
3. C6
4. D0

What is a molecule?

1. ATwo or more atoms held together by covalent bonds
2. BA mixture of two different elements
3. CA single atom with a positive charge
4. DThe nucleus of an atom

Which state of matter has neither a fixed shape nor a fixed volume?

1. ALiquid
2. BSolid
3. CCrystal
4. DGas

Normal saline (0,9% NaCl) is used for IV fluids. How is it described compared with blood?

1. AHypotonic
2. BIsotonic
3. CSaturated
4. DHypertonic

When a nucleus emits a beta particle, how do its mass number and atomic number change?

1. AMass number falls by 4 and atomic number falls by 2
2. BBoth fall by 1
3. CMass number rises by 1 and atomic number stays the same
4. DMass number stays the same and atomic number rises by 1

Why does stirring help a solid dissolve faster?

1. AIt turns the solid into a liquid
2. BIt raises the temperature of the solvent by friction a great deal
3. CIt increases the amount of solute that can dissolve in total
4. DIt brings fresh solvent into contact with the solid's surface

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

What is a triglyceride made of?

1. AOne fatty acid joined to three glycerol molecules
2. BThree amino acids joined by peptide bonds
3. COne glycerol molecule joined to three fatty acids
4. DThree glucose molecules joined together