Unit 3 Quiz

1. How are elements organized in the periodic table?

• by density and date of discovery

• by atomic mass and melting point

• by atomic number and their properties

• by abundance in nature and usefulness to humans

Which are compunds?

• helium (He)

• water (H2O)

• ammonia (NH3)

• nitrogen gas (N2)

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The diagram represents a chemical reaction. Reactant A and reactant B react to form product C. What type of substance is product C?

• an atom

• a mixture

• an element

• a compound

Tags

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Which two elements are most likely to have similar physical properties?

• Gallium

• Zinc

• Indium

• Silver

Can be observed without changing the identity of the material

• Atom

• Element

• Pure substance

• Physical property

The atomic mass of Chlorine is

• Cl

• 35.45

• 17

• 18.45

If you were to look at grains of table salt (sodium chloride, NaCl) with a magnifying glass, you would see that each grain is a little cube. Why are salt grains cubical?

• In the extended structure of NaCl, atoms are arranged in a cubical pattern.

• Sodium and chlorine atoms both have cubical shapes.

• One particle of NaCl contains eight atoms, each at one of the corners of a cube.

• All extended structure compounds form cubes.

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What information does this model show?

• Shows the type of atoms/elements in the molecule.

• Shows the type of bonds between the atoms.

• Shows the relative size of the atoms.

• Shows the shape of the molecule.

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What information does this model show?

• Shows the relative sizes of atoms.

• Shows the shape of the molecule.

• Shows the type of bonds between atoms.

• Shows the type of atoms in the molecule.

Tags

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Which of these is true about elements and compounds?

• Elements and compounds are both pure substances.

• Elements and compounds are both listed on the periodic table.

• Elements and compounds are both made up of different kinds of atoms.

• Elements and compounds can both be broken down by physical changes.