CHEMICAL INTERACTIONS Inv.1-2 Review Packet

What is the difference between the substances represented by the symbols Co and CO?

• They are two different ways to represent the element cobalt.

• One is the symbol for an element, and one is a formula for a compound

• Co represents the element cobalt, and CO represents the element copper

• They represent two substances, each made up of two elements

Tags

NGSS.MS-PS1-1

What was Mendeleyev's purpose for reorganizing the periodic table?

• He wanted to fit all the elements on one page instead of in a long line

• He wanted to put elements with similar characteristics in the same column

• He wanted to order the elements from the lightest to the heaviest

• He wanted to put all the metals on one side of the table and gases on the other

Which substance from the KEY is Sample B describing?

• Alum

• Citric Acid

• Epsom Salts

• Sodium Chloride

True or False: An element symbol can have TWO capital letters. For example PB is lead

• True

• False

Which of the following is correct when it comes to CO2?

• One Carbon Two Oxygen

• One Carbon One Oxygen

• One Cobalt

• Two Cobalt

Tags

NGSS.MS-PS1-1

A student mixes a white solid and a clear liquid together. Which observations are evidence that a chemical reaction has NOT occurred?

• It turned a different color.

• The solid disappears into the liquid

• it bubbles and fizzes

• It gets warmer

Tags

NGSS.MS-PS1-2

When Mendeleyev changed the layout, there were gaps where no known element fit. How did the gaps NOT help scientists look for undiscovered elements?

• The gaps predicted the mass of new elements

• The gaps predicted the characteristics of new elements.

• The gaps showed scientists what elements could not exist

• The gaps showed scientists what elements could not exist

How many Neutrons are present in the Sodium atom ?

• 12

• 11

• 0

• 23

Tags

NGSS.MS-PS1-1

What is atomic number ?

• Number of Protons

• Number of Electrons

• Number of Protons and Electrons

• Number of Protons and Neutrons

The atomic number of Lithium is

• 3
• 4
• 5
• 6