Final Honors Chemistry Sem 1

Why is an alpha particle written as a helium (He) nucleus?

• • 
    

    An alpha particle is a stable, non-reactive particle, like the noble gas helium.

• An alpha particle has two protons and two neutrons; it is essentially the nucleus of a helium atom.

• An alpha particle has two electrons; it is essentially an atom of helium.

• Helium is a common element that is often present in small forms; the alpha particle was misidentified in early scientific studies as helium.

Tags

NGSS.HS-PS1-8

Question

Examine the scenario. 
 
The procedures of an experiment state that 1.3 g of copper (Cu) should be produced. However, the scientist’s experiment produces 0.9 g.  
 
What is the absolute error? 

Responses

• 
  

• 30.8%

• 0.3 g

• 0.4 g

• 44.4 g

Tags

CCSS.6.RP.A.3C

Using chemical nomenclature, what is the name for Al₂S₃?

• 
  

• aluminum trisulfide

• • 
    

    dialuminum trisulfide

• • 
    

    aluminum sulfide

• • 
    

    aluminum sulfur

Question

Study the balanced equation. 
 
3O₂ → 2O₃ 
 
When 4.26 x 10¹⁶ mol of oxygen (O) are converted into ozone, how many mol of the pollutant (O₃) are formed? 

• • 
    

    6.39 x 10¹⁴ mol O₂

• 6.39 x 10¹⁶ mol O₂

• 2.84 x 10¹⁶ mol O₂

• 2.84 x 10¹⁵ mol O₂

Tags

NGSS.HS-PS1-7

If SiO₂ undergoes a double-displacement reaction with HF, what is the balanced equation? 

• • 
    

    SiO₂ + HF → HSi + FO₂ 

• SiF₂ + H₂O → SiO₂ + 2HF 

• SiO₂ + 4HF → SiF₄ + 2H₂O

• SiO₂ + 2HF → SiF₂ + 2H₂O 

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

If:

bohrium has 107 protond, 155 neutrons, 107 electrons

uranium has 92 protons, 146 neutrons, 92 electrons

francum has 87 protons, 136 neutrons, 87 electrons

seaborgium has 100 protons, 157 neutrons, 100 electrons

Which element has thegreatest atomic mass?

• Bohrium

• uranium

• seaborgium

• francium

How are the families of the periodic table organized?

(Select all that apply.)

• by the properties the elements share, such as reactivity

  
  

• based on the group of the elements

• by the class of the elements, such as metal or nonmetal

• based on the period of the elements

Which contributions made by scientists played the greatest role in expanding the study of chemistry?

(Select all that apply.)

• 
  

• Dmitri Mendeleev’s table of elements left open spaces to propel further discovery of elements based on chemical properties.

• George Washington Carver promoted the collaboration of chemists with agriculturalists and industrialists in ways that improved society.

  
  

• Marie Curie’s discovery of polonium and radium led to the creation of paints that glowed in the dark.

• • 
    

    Michael Faraday’s development of the electromagnetic rotary device became the foundation of the electric motor.  

Why is a translucent, brittle crystal that conducts electricity only as a solution considered an ionic compound and not a metallic compound?

(Select all that apply)

• • 
    

    A metallic compound must be silver in color, while ionic compounds always form translucent crystals.

• A metallic compound would be able to conduct electricity as a solid, while an ionic compound can only conduct electricity when its ions are dissociated in a solution.

• • 
    

    An ionic compound would break when hit with a hammer, while a metallic compound is malleable and would not shatter.

• • 
    

    An ionic compound forms a crystal structure, while metallic compounds often form shapes based on the bond angles.

Tags

NGSS.HS-PS1-3

How many g are in 6.35 x 10³¹ particles of nickel (Ni) if nickel’s molar mass is 58.693 g/mol? 

• 6.51 x 10⁵³ g Ni

• 1.80 x 10⁶ g Ni

• 1.08 x 10³⁰ g Ni

• 6.19 x 10⁹ g Ni