Question

Part A

A sample of tap water consists of water, fluoride ions, calcium ions, and several other dissolved ions. The ions are evenly distributed throughout the water.

Which term or terms could be used to describe this sample of tap water?

mixture

heterogeneous mixture

homogenous mixture

solution

pure chemical substance

compound

element

Part B

A silver necklace is made from a pure sample of silver that is free of impurities.

Which term or terms could be used to describe this sample of silver?

mixture

heterogeneous mixture

homogenous mixture

solution

pure chemical substance

compound

element

Part C

A blood sample contains several different types of cells, each of which contains different combinations of specific ions and molecules. The cells are suspended in water, and the water also contains many molecules and ions.

Which term or terms could be used to describe this sample of blood?

mixture

heterogeneous mixture

homogenous mixture

solution

pure chemical substance

compound

element

Part D

A gas turbine is filled with pure methane for use as a fuel.

Which term or terms could be used to describe the contents of this gas turbine?

mixture

heterogeneous mixture

homogenous mixture

solution

pure chemical substance

compound

element

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