Significant Figures and Matter

How many significant figures are in 0.980?

• Five significant figures

• Four significant figures

• Three significant figures

• Two significant figures

How many significant figures are in 1.023?

• Five significant figures

• Four significant figures

• Two significant figures

• Three significant figures

How many significant figures are in 0.0000405?

• Four significant figures

• Three significant figures

• Two significant figures

• Five significant figures

How many significant figures are in 100.?

• Four significant figures

• Three significant figures

• Two significant figures

• One significant figure

What is the molar mass of carbon to two significant figures?

• 10 g/mol

• 14 g/mol

• 12 g/mol

• 16 g/mol

Match each mixture type with its correct description of uniformity.

• Mixture type with unchanging composition

• Solutions are uniform; heterogeneous are not uniform

• Mixture type with changing composition

• Solutions are not uniform; heterogeneous are uniform

• Mixture type where all parts look the same throughout

• Solutions are constant; heterogeneous are variable

• Mixture type where different parts can be seen

• Solutions are variable; heterogeneous are constant

Melting a piece of chocolate is best classified as which type of change?

• Biological change

• Nuclear change

• Physical change

• Chemical change

Burning sugar is best classified as which type of change?

• Phase change

• Chemical change

• Mechanical change

• Physical change

Which separation method would you use to separate dissolved salt from seawater efficiently?

• Chromatography on silica

• Magnetic separation of ions

• Evaporation then crystallization

• Filtration through fine mesh

Accuracy in measurements refers to which idea?

• Closeness to the true value

• Consistency among repeated trials

• Ability to avoid systematic error

• Number of significant figures used