Elements Compounds and Mixtures OL

Which of the following is an example of the formation of a mixture?

• Rust forming on an iron nail.

• Sugar crystals dissolving in water.

• Sodium and chlorine forming table salt.

• Hydrogen and oxygen reacting to produce oxygen.

Which statement identifies why oxygen is classified as a pure substance and air is classified as a mixture?

• Oxygen is more reactive than air.

• Oxygen has a higher density than air.

• Oxygen goes under a phase change, whereas air is always a gas.

• Oxygen contains only one substance, but air contains several substances.

The chemical equation shown below represents a reaction that produces fuel for certain cars.

CO + H₂O------->CO₂ + H₂

_{Which substance in this equation is classified as an element?}

• CO

• O₂

• CO₂

• H₂

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This image is a model of...

• an element

• a compound

• a homogenous mixture

• a heterogeneous mixture

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This picture is a model of...

• an element

• a compound

• a homogenious mixture

• a heterogeneous mixture.

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This picture is a model of a...

• element

• compound

• homogeneous mixture

• heterogeneous mixture

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A pure substance that cannot be separated into simpler substances by chemical or physical means.  

• Element
• Compound
• Mixture
• Chemical

These contain only one kind of atom. 

• element 
• compound 
• mixture 
• water 

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A compound is made of ________ atoms. 

• big 
• similar 
• different 

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Carbon Dioxide is a ______ 

• compound 
• element 
• mixtures 
• Battle of Bunker Hill 

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