Intro to Chemical Concepts Bellwork Review

Intro to Chemical Concepts:

Bellwork Review

​Subatomic Particles Charge

​1. Protons - positive charge (+)

2. Neutrons - neutral charge/ no charge (0)

3. Electrons​ - negative charge (-)

*Protons & electrons are in

the nucleus

*Electrons are located in energy

levels outside thenucleus

Match

Match the following.

• Proton

• Electron

• Neutron

Positive (+)

Negative (-)

Neutral (0)

• Positive (+)

• Negative (-)

• Neutral (0)

​Parts of Periodic Table Square

Multiple Choice

Identify number 15 on the periodic table square below.

• atomic number

• element name

• atomic mass

• chemical symbol

Multiple Choice

Identify number 14 on the periodic table square below.

• atomic mass

• chemical symbol

• atomic number

• element name

Multiple Choice

Identify number 16 on the periodic table square below.

• atomic mass

• element name

• chemical symbol

• atomic number

Multiple Choice

Identify number 17 on the periodic table square below.

• atomic mass

• atomic number

• chemical symbol

• element name

Reactivity

• ability of a substance to react

• decreases left ➡️ to right ⬅️

• Group 1 Alkali Metals are most reactive

• Group 18 Noble Gases are least reactive, inert

Multiple Choice

Which group is the most stable (least reactive)?

• 17

• 1

• 2

• 18

Multiple Choice

On the periodic table, reactivity increases as you move ______________.

• from right to left

• from left to right

Match

Match the following

• Periodic Table

• Family/Group

• Period

• Atomic Mass

• Metal

All known elements arranged in order by atomic number.

Vertical columns of elements that have the same amount of valence electrons.

Horizontal rows of elements that have the same number of electron shells. 

The average number of protons and neutrons in one atom of an element.

Elements that are malleable, ductile, and good conductors; typically shiny.

• All known elements arranged in order by atomic number.

• Vertical columns of elements that have the same amount of valence electrons.

• Horizontal rows of elements that have the same number of electron shells. 

• The average number of protons and neutrons in one atom of an element.

• Elements that are malleable, ductile, and good conductors; typically shiny.

Metals, Nonmetals, Metalloids

• Metals: ductile, malleable, luster, solids

• Metalloids: properties of metals & nonmetals

• Nonmetals: brittle & dull

Physical Properties of Metals

• Luster - Shines, reflects light

• Great Conductivity - How well electricity and heat travels through the element

• Malleable - Can be beaten into different shapes without breaking

• Ductile - Turned into wires

• Solid at room temperature - Except for Mercury

Metalloids

• Found in the "staircase" separating metals and nonmetals. Starting at B (boron)

• The smallest amount of elements on the table

• Examples: Boron, Silicon, Arsenic

Properties of Nonmetals

• Essentially, they are the opposite of metals

• Dull, not shiny

• Brittle when solid

• Some are gasses

• NOT malleable, conductive, or ductile

Multiple Choice

Students in Mrs. Clark's science class are investigating a substance that has the following properties

-shiny

-bends easily

-hard, not easily broken

Based on these properties how would you classify the substance?

• metal

• nonmetal

• metalloid

Multiple Choice

The elements along zig zag line on the periodic table of elements are:

• metals

• nonmetals

• metalloids

Multiple Choice

Based on its position in the Periodic Table, at room temperature, cadmium is most likely a

• metal

• nonmetal

• metalloid

Multiple Choice

If the substance is neutral, what would the pH be?

• 3

• 5

• 7

• 9

• 11

Multiple Choice

Which of the following pH values represents a base?

• 2.1

• 4.6

• 6.8

• 8.1

Multiple Choice

The strongest bases have pH values close to

• 0

• 14

• 7

• 5

Multiple Choice

Milk is a very weak acid. What might its pH value be?

• 6.5

• 7.8

• 4.2

• 12.2

Multiple Choice

Which of these pH values represent an acid?

• 4

• 8

• 10

• 12

Multiple Choice

Which is the stronger acid?

• pH 1

• pH 4

• pH 8

• pH 13

Open Ended

What are two examples of a chemical change that was stated in the video?

Use complete sentences and correct punctuation and grammar.

Multiple Choice

what is an example of a physical change?

• brownies

• Cutting paper

• cupcakes

• cookies

Multiple Choice

Is it a physical or chemical change?

• Physical

• Chemical

Multiple Choice

Is it a physical or chemical change?

• physical

• chemical

Multiple Choice

Vinegar + baking soda reaction.

Is it a physical or chemical change?

• Physical

• Chemical

Multiple Choice

Rotting banana

Is it a physical or chemical change?

• Physical

• Chemical

Multiple Choice

Water + Kool-aid Powder.

Is it a physical or chemical change?

• Physical

• Chemical