Chemistry Review 2023

Cindy is developing a simple atomic model to illustrate the basic components.

 Which of the following models is correct?

• A

• B

• C

• D

Below are four models of atoms.

 Which two locations, indicated by the arrows, would be where electrons are found?

• 1 and 2

• 3 and 4

• 2 and 4

• 1 and 3

Which of the following best represents the nucleus in a model of an atom?

• a positively charged nucleus consisting of protons and neutrons

• a positively charged nucleus consisting of electrons and neutrons

• a neutral nucleus consisting of protons and neutrons

• a neutral nucleus consisting of electrons and neutrons

Use the table to answer the following question.

 Which two elements share the most similar chemical properties?

• Nitrogen (N) and Sulfur (S)

• Nitrogen (N) and Phosphorus (P)

• Nitrogen (N) and Carbon (C)

• Nitrogen (N) and Silicon (Si)

Based on its position in the periodic table, how is the element with 16 protons best described?

• Brittle

• Ductile

• Malleable

• Good Conductor

Attached is a diagram that shows sections of the periodic table.

 In which section of the periodic table would an element with properties of both metals and nonmetals be found?

• 1

• 2

• 3

• 4

A student observed two substances labeled substance A and substance B. She then mixed them together and made a third substance labeled substance C. Below are her observations of the three substances.

 How would you classify substance C?

• homogeneous mixture

• element

• heterogeneous mixture

• compound

A chemist needed to identify a sample of an unknown material. She determined the following from her investigation:

The material cannot be broken down into simpler substances by physical means.

The material can be broken down into simpler substances by a chemical reaction.

The products that are produced when the material is broken down have unique properties.

 

How can the chemist best classify the unknown material?

• a heterogeneous mixture

• a homogeneous mixture

• a compound

• an element

Which of the following is a mixture?

• 
• 
• 
• 

Use the periodic table below to answer the question.

  Which of the following compounds has an ionic bond?

• C₆H₁₂O₆

• H₂O

•  CO₂ 

• NaCl