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Sodium belongs to group number _______ on the periodic table.


A) 1
B) 2
C) 7
D) 8

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Mixtures can often be separated into pure substances by taking advantage of differences in the physical properties of the pure substances contained in the mixture.Which one is not a physical property?


A) color
B) boiling point
C) melting point
D) flammability

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The law of constant composition states that


A) the number of atoms in a compound only changes when the compound changes state.
B) a given compound has a fixed and definite number of atoms of each of its constituent elements.
C) compounds react with each other in whole unit ratios.
D) the composition of a compound will be the same before and after a reaction.

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On the periodic table, vertical columns are called


A) periods.
B) groups or families.
C) sets.
D) metals.

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Which one of the following pairs of elements would be most likely to share similar properties?


A) N and F
B) B and Si
C) Cl and Br
D) Br and Kr
E) Li and Be

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What is the best way to reduce the environmental impact of gold mining?


A) Use fewer heavy metals for its extraction.
B) Isolate the mines from fragile ecosystems.
C) Buy and use recycled gold.
D) Raise the price of gold.

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The rainforest in Peru is a hotspot for gold mining.What element is having a large and negative impact on local ecosystems?


A) gold
B) chlorine
C) manganese
D) mercury

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Locard's principle states that


A) when two things come into contact there is always a transfer of material from one object to another.
B) when an atom is energized it always emits light.
C) dog hair always sticks to corduroy pants.
D) a chemical reaction emits less energy than a nuclear reaction.
E) none of the above.

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Write the formula for a compound that contains four hydrogen atoms, two oxygen atoms, and two carbon atoms.


A) 4H2O2C
B) C2H4O2
C) C2O2H4
D) CHHHCOOH

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Which element is present in the greatest quantity in soil?


A) carbon
B) iron
C) calcium
D) oxygen
E) bromine

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Cl can be classified as a


A) metal.
B) metalloid.
C) nonmetal.
D) gas.

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Identify the halogen.


A) K
B) Ni
C) Pb
D) I
E) Ne

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How does gold mining pollute local waterways?


A) The large volume of dirt that is left behind clogs nearby waterways.
B) Mining runoff contains toxic chemicals such as arsenic, which can contaminate nearby lakes and rivers.
C) Heavy metals from the mining process sink to the bottom of streams and rivers, killing off wildlife.
D) Local rivers are dammed to provide water for the mining process.This upsets the local plant and animal life.

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Which three toxic elements are part of e-waste?


A) Na, V, Ti
B) Pb, Ag, Au
C) U, Th, Tc
D) Pb, Hg, Cd

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On the periodic table, horizontal rows are called


A) families.
B) groups.
C) periods.
D) cousins.

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When a substance in the solid phase jumps directly to the gas phase, the process is known as


A) sublimation.
B) vaporization.
C) condensation.
D) melting.

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Which one of the following is not a characteristic of metals?


A) malleable
B) brittle
C) ductile
D) good electrical conductors

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Identify the transition metal.


A) Cs
B) Fe
C) As
D) N
E) H

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Organic substances will always contain what element?


A) iron
B) carbon
C) tin
D) chlorine
E) lead

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According to the following chemical formula, how many atoms of hydrogen does glucose, C6H12O6, contain?


A) 12
B) 6.02 × 1023 × 12
C) 6.02 × 1023
D) 24

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