CP L- 1.8 Chemical Properties

CP L- 1.8 Chemical Properties

By Ms. Bailey*

​Lesson Objective:

​KWBAT review atomic structure and chemical properties and completing practice STAAR questions.

• KWBAT practice test-taking strategies to help prepare for the end of unit assessment and G8 STAAR

​TEKs:

​TEKS 8.5(A): describe the structure of atoms, including the masses, electrical charges, and locations, of protons and neutrons in the nucleus and electrons in the electron cloud

TEKS 8.5(C): interpret the arrangement of the Periodic Table, including groups and periods, to explain how properties are used to classify elements

TEKS 8.5(B):  identify that protons determine an element’s identity and valence electrons determine its chemical properties, including reactivity

​Welcome back chemist! We’ve learned a lot in the last several lessons about atomic structure, an element’s identity, valence electrons, chemical properties and reactivity.  Today, we will play a game and answer STAAR practice questions to review and apply our new understandings.

Open Ended

Based on what you’ve learned, why do some elements, such as sodium, react explosively in water?

SS: Some elements are highly reactive because...

​STARR Practice Questions

Multiple Choice

A fluorine atom has nine protons.  What identity of fluorine do the nine protons determine?

• The nine protons determine that fluorine has an atomic number of nine.

• The nine protons determine that fluorine has a mass number of nine.

• The nine protons determine that fluorine has nine valence electrons.

• The nine protons determine that fluorine has nine neutrons.

Open Ended

Why was the answer atomic number?

SS: The answer was atomic number because....

Multiple Choice

Where are valence electrons of an element found?

• Within the nucleus of its atom

• In its atoms’ most innermost shell

• Outside of its atoms

• In its atoms’ outermost shell

Open Ended

Where are the valence electrons located in the atom?

SS: The valence electrons are located on the ____ in an atom.

Multiple Choice

What is the correct order, from least to greatest, of the atomic numbers of these elements?

• Hydrogen, carbon, neon, nitrogen

• Neon, nitrogen, carbon, hydrogen

• Hydrogen, carbon, nitrogen, neon

• Carbon, hydrogen, neon, nitrogen

Multiple Choice

Place these elements in order based on their atomic number.

• B, Si, As, Te, I

• Si, Te, B, As,I

• I, As,Te,B,Si

Multiple Choice

Using the same table, what is the correct order, from least to greatest, of the chemical reactivity of the elements?

• Hydrogen, carbon, nitrogen, neon

• Neon, nitrogen, carbon, hydrogen

• Hydrogen, nitrogen, carbon, neon

• Carbon, hydrogen, neon, nitrogen

Multiple Choice

Place these elements in order based on their valence electrons

• H, Ca, Al, Ga

• Ga, Al,Ca,H

• H,Ca,Ga,Al

Multiple Choice

Which two elements have reactivity that is similar to bromine (Br)? (Select two)

• Tennessine, Ts

• Argon, Ar

• Fluorine, F

• Oxygen, O

• Sodium, Na

Multiple Choice

What is the combined total of protons from sodium, Na and magnesium, Mg?

• 25

• 32

• 23

• 18

Multiple Choice

Based on the models, which element is the most reactive?

• Lithium, because it has one electron in the second shell.

• Beryllium, because it has three electrons in the second shell.

• Carbon, because it has four electrons in the second shell.

• Neon, because it has eight electrons in the second shell.

Open Ended

Why is lithium most reactive? What determines the reactivity of an element?

SS: Lithium is most reactive because____. _____ determines how reactive an element is.

Multiple Choice

Based on the models, which element is the least reactive?

• Lithium, because it has one electron in the second shell.

• Beryllium, because it has three electrons in the second shell.

• Carbon, because it has four electrons in the second shell.

• Neon, because it has eight electrons in the second shell.

Open Ended

Why is neon the least reactive? What determines that?

SS: Neon is the least reactive element because____. _____ determines this.

Multiple Choice

What period is Beryllium in?

• 2

• 4

• 3

• 5

Multiple Choice

What period is neon in?

• 2

• 8

• 10

• 4

Multiple Choice

What group is carbon in?

• 4

• 2

• 6

• 8

Multiple Choice

what group is neon in?

• 8

• 10

• 2

• 4

Multiple Choice

What group and period is beryllium in?

• P=2

  G=2

• P=2

  G=4

• P=4

  G=2

​Exit Ticket Time!

Multiple Choice

Which two elements have similar chemical reactivity to strontium, Sr?

• Sodium, Na and Magnesium, Mg

• Beryllium, Be and Calcium, Ca

• Fluorine, F and Lithium, Li

• Rubidium, Rb and Yttrium, Y

Multiple Choice

Based on the table, which statement about chemical reactivity is accurate?

• Nitrogen is the least reactive  because it has the fewest protons.

• Sodium is the least reactive because it has 1 electron in the outer shell.

• Oxygen is the least reactive because it has eight total electrons.

• Argon is the least reactive because it has eight electrons in the outer shell.

Multiple Choice

Which statement best describes the parts of an atom that determines an atom’s identity and chemical properties?

• The neutrons determine the identity of an atom and the electron cloud determines the chemical properties of an atom.

• The protons determine the identity of an atom and the valence electrons determine the chemical properties of an atom.

• The valence electrons determine the identity of an atom and the protons determine the chemical properties of an atom.

• properties of an atom.

  The electron cloud determines the identity of an atom and the neutrons determine the chemical properties of an atom.