G7 ESL Sc. U2

Front

An element has a metallic-gray appearance. It also has the properties of both a metal and a nonmetal.  In which section of the periodic table shown above would the element most likely be found?

Back

3

Front

Which model correctly shows a mixture that is made of an elemental molecule and a compound? 

Back

3

Front

Which experimental results show a mixture?

A.Ruth applies heat to a liquid, and large green crystals are left in the beaker after all the liquid has boiled away.

B.Aria applies heat to an unknown substance.  A gas is produced and an entirely new substance with new properties is left in the beaker.

C.Marcus applies heat to a liquid.  The liquid bubbles and turns into a gas.

D.Simon applies heat to a solid and the solid melts into a puddle.

Back

B

Front

A mystery element is very brittle as a solid, is not shiny, and does not conduct electricity or heat well. This element is not malleable and has a relatively low melting and boiling point. Based on the evidence, which group does the mystery element belong?

Back

4

Front

Based on the number of valence electrons shown for the samples below, place the samples in order from the lowest number of valence electrons to the highest.

Back

A. Na, Mg, C, Cl

Front

Which option contains only compounds?

Back

B. H₂0, H₂O₂, H₃O, CO₂

Front

Examine the models. Choose the model(s) that represent a pure substance.

Back

A and C

Front

A trumpet is a musical instrument made of brass.  Brass is made of both copper and zinc metals. The copper and zinc in brass can be separated when heated. Brass is not on the periodic table of elements and when melted has two distinct melting points.

Back

Which statement is the BEST description of brass?

Brass is a mixture.

Front

Which of these samples represents an element?

Back

2

Front

Baking soda is used to make cookies.  The chemical formula for baking soda is NaHCO₃. Which term describes baking soda?

Back

monoatomic element