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In the equation,          2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O
• MgO
• Mg and MgO
• O and MgO

What is the definition of a chemical change?

• Characteristics that describe how a substance behaves under different conditions
• Alteration in the physical state of matter without changing its chemical composition
• Transformation that results in the creation of new substances
• Inherent characteristics that help us identify and describe matter

Which of the following is a chemical property?

• odor
• flammability
• boiling point
• conductivity

Which of the following is a physical property?

• Ability to react with oxygen
• Ability to rust
• Ability to burn
• Ability to conduct electricity

What type of properties can be observed or measured without changing the substance's chemical composition?

• Both physical and chemical properties
• Physical properties
• Neither physical nor chemical properties
• Chemical properties

Which of the following is an example of a chemical property?

• Melting point
• Density
• Color
• Ability to react with acid

What is the definition of physical changes?

• changes that describe how a substance behaves under different conditions
• characteristics that describe how a substance interacts with other substances
• changes that alter the form or appearance of a substance, but not its chemical composition
• changes that lead to the formation of new substances with different chemical properties

What is the definition of a physical change?

• Alteration in the physical state of matter without changing its chemical composition
• Inherent characteristics that help us identify and describe matter
• Characteristics that describe how a substance behaves under different conditions
• Transformation that results in the creation of new substances

What type of change occurs when a substance reacts with an acid?

• physical change
• neither physical nor chemical change
• chemical change
• both physical and chemical change

What happens to the fundamental particles during a physical change?

• They remain the same
• They break and form new chemical bonds
• They become completely different substances
• They disappear