Which of the following is the best description of an element.

• a substance that cannot be broken down into simpler substances

• a naturally occurring mineral made of more than one substance

• a small particle made with a specific chemical composition

• a collection of atoms that have different abilities when joined together

How many of these substances are elements

NaOH Cu H2O N2 H2

• 2

• 3

• 4

• 5

Which of the following characteristics is shared by all chemical reaction

• produce a precipitate

• show a color change

• release heat energy

• form new substance

Tags

NGSS.MS-PS1-2

unlike non-metals, most metals tend to-

• conduct electricity and heat well

• be gases at room temperature

• break easily when hammared

• have less luster and shine

Density is calculated by dividing the mass of a substance by its-

• volume

• weight

• lenght

• temperature

How would you write 4.3756 x 10⁴ in standard form?

• 437,560,000
• 0.00043756
• 43,756
• 4,3756

How would you write 0.0005 in scientific notation?

• 50 x 10⁵
• 5 x 10^-4 
• 5 x 10³
• .5 x 10³

How many electrons can be held in the first energy level ?

• 1
• 2
• 8
• 16

How many electrons can the 2nd energy level hold ?

• 2
• 4
• 8
• 16

____________ can move from one energy level to another when they gain or lose energy.

• electrons
• protons
• neutrons
• atoms

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2