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What does John Dalton’s atomic theory propose?
Matter is made of molecules.
Matter is made of energy.
Matter is made of tiny pieces called atoms.
Matter is made of light.
How many different types of atoms are currently known?
150
100
118
50
What does the chemical formula C6H12O2 represent?
Carbon dioxide
Water
Ethyl butyrate
Isovaleric acid
Why does ethyl butyrate smell pleasant like oranges?
It is found naturally in many fruits.
It is a processed compound made in a lab.
It is made of carbon and hydrogen atoms.
It has the same atomic structure as oxygen.
What makes Isovaleric acid smell unpleasant?
It has a slightly different atomic structure than ethyl buty
It is colorless.
It is a solid at room temperature.
It is made of sulfur atoms.
What are diamonds made of?
Hydrogen and oxygen atoms
Zirconium and oxygen atoms
Nitrogen atoms
Carbon atoms
What is cubic zirconia made of?
Pure carbon
Groups of zirconium and oxygen atoms
Molecules of gold
Carbon and hydrogen atoms
Why are diamonds harder than cubic zirconia?
Cubic zirconia contains impurities.
Diamonds are made of pure carbon atoms packed tightly.
Cubic zirconia is a liquid at high temperatures.
Diamonds are heavier.
What is the difference between molecules and extended structures?
Molecules contain more oxygen than extended structures.
Molecules are larger than extended structures.
Molecules are always solid; extended structures are liquid.
Molecules are separate units; extended structures are interc
Which substance is an example of an extended structure?
Diamond
Ethyl butyrate
Air
Water
How do chemists determine if a gemstone is a real diamond?
By testing if it can dissolve in water.
By looking for the presence of carbon atoms.
By checking if it contains zirconium.
By examining its price.
What makes substances have different properties?
Their atomic weight.
Their shape and size.
The number and type of atoms that repeat in their structure.
The temperature at which they are found.
