6.6

A streak test used to identify minerals requires —

• studying crystals with a magnifying glass

• scratching the mineral with an iron nail

• identifying the color of the powdered mineral

• observing how it reflects light from its surface

Which two physical properties of minerals can be observed without touching the minerals?

• Color and streak

• Luster and color

• Streak and hardness

• Hardness and luster

Where are the nonmetals located?

Tags

6.6C

Where are the metalloids located?

Tags

6.6C

Where are the metals located?

Tags

6.6C

Which layers are less dense than 1 g/cm? Click all that apply.

Tags

NGSS.MS-PS1-2

The maximum number of individuals of one species that an environment can support is called...

• limiting factor

• carrying capacity

• competition

Choose examples of changes to the environment that affect population size...

• forest fire

• drought

• harsh weather

• new competition

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

What is the pH value of a neutral solution at 25°C?

• 4.0

• 6.6

• 7.0

• 9.0

Which of the following pH values indicates a basic solution?

• 3.5

• 6.6

• 7.0

• 8.5