Elements and Compounds Retest

Which of the following statements is NOT true regarding elements and compounds?

• Compounds are made of two or more elements.

  
  

• Compounds are represented by formulas.

• Elements are represented with multiple chemical symbols.

  
  

• An element is a pure substance made of only one kind of atom.

  
  

Which of the following is used to represent an element on the periodic table?

• The element's density

  
  

• The element's smell

  
  

• The element's color

  
  

• The element's chemical symbol

  
  

Match each statement with whether it describes an element or a compound.

• Describes how compounds and elements are identified incorrectly.

  
  

• An element indicates the type of molecule found in a substance, while a compound refers to the type of atom found in a substance.

  
  

• Describes a correct difference between elements and compounds.

  
  

• Compounds are made up of one type of atom, while elements are not.

  
  

• Describes a compound incorrectly.

  
  

• Compounds can be identified by chemical symbols, while elements can be identified by chemical formulas.

  
  

• Describes the difference between element and compound incorrectly.

  
  

• Elements are listed on the periodic table, while compounds are not.

  
  

A student classified four different substances in a data table.

Which substance is identified correctly? 

• Substance B

• Substance C

• Substance D

• Substance A

Tags

NGSS.MS-PS1-1

Several substances are classified in each column of the data table.

Which of the following would be the BEST titles for each column on the table? 

• 1 - Compounds
  2 - Molecules

• 1 - Atoms
  2 - Molecules

• 1 - Compounds
  2 - Elements

• 1 - Symbols
  2 - Formulas

Tags

NGSS.MS-PS1-1

Why should Chloroform be classified as a compound?

• It contains at least two elements of different atoms.

• It contains at least two atoms of the same element.

• It contains at least two elements of different compounds.

• It contains at least two atoms of different elements.

Tags

NGSS.MS-PS1-1

Which term BEST describes each statement? Move ONE correct answer to each box.

Represented by a chemical formula and is always a molecule. (a)  

Represented by a chemical symbol and is always one kind of atom. (b)  

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• Element
• Compound

Which of the following is a compound?

• O₂

• NaCl₂

• K

• Fe₂

Tags

NGSS.MS-PS1-1

The picture shows a group of students debated the difference between chemical symbols and formulas. Which student correctly summarizes the difference between chemical symbols and formulas? 

• Student A

• Student B

• Student C

• Student D

The chemical formula Na₂CO₃ contains one atom of...

Tags

NGSS.MS-PS1-1