Elements, Compounds and Experimental Techniques

A Solution consisting of a Soluble Solid and a particular Solvent can be separated by:

• Simple Distillation.

• Fractional Distillation.

• Evaporation.

• Centrifuging.

What was the name of the Scientist responsible for defining Atoms?

• John Dalton.

• Robert Boyle.

What was the name of the Scientist responsible for defining Elements?

• Robert Boyle.

• John Dalton.

What is the relationship between molecules and atoms?

• Molecules are combinations of two or more atoms.

• Molecules are the parts that make up atoms

• Molecules are the gaseous parts of atoms

• Molecules are atoms that have a positive charge

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Mixtures are different than pure substances because mixtures-

• have lower boiling points

• can be separated physically

• are less dense than pure substances

• contain only one type of atom

Which of the following is true of oxygen?

• Oxygen is an element because its most basic unit is a single type of atom

• Oxygen is a compound because its most basic unit is a single type of atom.

• Oxygen is a mixture because its most basic unit contains more than one particle.

• Oxygen is a compound because its most basic unit contains more than one type of particle.

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Humans absorb oxygen from the air they breathe in and exhale carbon dioxide gas, CO2. Carbon dioxide gas is

• an element made of carbon and oxygen atoms.

• a solution made of carbon and oxygen atoms.

• a compound of carbon and oxygen atoms.

• a mixture of carbon and oxygen atoms.

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Sam's mother is cooking breakfast in a cast-iron frying pan. If the pan is made only of iron, what can Sam conclude?

• The pan is a pure substance with the chemical symbol Ir.

• The pan is a pure substance with the chemical symbol I.

• The pan is a pure substance with the chemical symbol F.

• The pan is a pure substance with the chemical symbol Fe.

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contains 2 or more substances that are physically combined

• element

• compound

• mixture

Classify the picture with the correct label.

• Element
• Compound
• Mixture of Elements
• Mixture of Compounds

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NGSS.MS-PS1-1