Unit 6: Elements & Compounds

Which of the following is not a compound?

• O

• CHO

• NaCl

• CHLi

Which of the following is a compound from the chemical reaction listed above?

• Oxygen

• Hydrogen

• Water

• Carbon

Which substance represented in this equation is classified as an element?

• CO

• H₂O

• CO₂

• H₂

What is an example of a physical property?

• Color change

• Bubbling

• Boiling point

• Formation of a gas

Which of the following diagrams illustrates a compound?

• 
• 
• 
• None of the above

Which of the following best describes the difference between elements & compounds?

• Elements and compounds are so similar in chemical nature that they are virtually the same thing.

• Elements and pure substances composed of one kind of particles whereas compounds are substances that contain two or more elements that have chemically combined.

• Elements can be found naturally whereas compounds have to be created by scientist.

• Elements are substances that contain two or more particles that have chemically combined whereas compounds are pure substances composed of one kind of particle.

Which of the following list contains an element followed by a compound that contains that element?

• NH₃ He

• H H₂O

• CO₂ C

• NaCl Co

Ms. Holmes had a beaker with a small amount of baking soda. She added a few drops of vinegar to the baking soda and observed fizzing and bubbling. Based on her observation, which of these can Ms. Holmes determine about the new substance formed by mixing baking soda and vinegar?

• A chemical reaction produced a solid.

• A chemical reaction produced a gas.

• No chemical reaction occurred.

• Only a physical change happened.

Tags

NGSS.MS-PS1-2

Which list contains chemical changes only?

• 
• 
• 
• 

A chemical change is?

• Reversible.

• Permanent.

• A phase change.

• A temperature change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5