Flashcards for Unit 1

Matter Anything that has mass & occupies space.

7 How many fundamental units in the SI system?

Fundamental or Base Unit Physical quantity that must be measured. It cannot be calculated.

Derived Unit A unit defined as a combination of fundamental units.

Unit of mass Kilogram Fundamental Unit

Unit of time Second Fundamental Unit

Unit of length Meter Fundamental Unit

Unit of temperature Kelvin Fundamental Unit

Space or Capacity Volume Derived Unit

Metric Unit of Volume 10 cm X 10 cm 10 cm Liter Derived Unit

1000 cm3 = 1 Liter ? cm3 = 1 Liter Derived Unit

1000 mL = 1 Liter ? milliliter = 1 Liter Derived Unit

1 mL = 1 cm3 ? milliliter = 1 cm3 Derived Unit

What is the mass of 1 liter of pure H2O? 1 kilogram What is the mass of 1 liter of pure H2O? Mass/Volume relationship

What is the mass of 1 cm3 of pure H2O? 1 gram What is the mass of 1 cm3 of pure H2O? Mass/Volume relationship

Freezing Point of water in the Kelvin scale. Physical Constant

Boiling Point of water in the Kelvin scale. Physical Constant

Freezing Point of water in the centigrade scale. Physical Constant

Boiling Point of water in the centigrade scale. Physical Constant

Another name for freezing point. Ice / water equilibrium

Another name for boiling point. Steam / water equilibrium

100 cm = 1 meter ? cm in 1 meter Conversion Fact

1000 mm = 1 meter ? mm in 1 meter Conversion Fact

1000 m = 1 kilometer ? m in 1 km Conversion Fact

Mass / Volume Density

Describes how matter is packed into space. Density

grams / cm3 Units of Density

M D V Density

How close a measured value is to an accepted value. Accuracy

How close a series of measurements are to one another. Precision

Measured value – Accepted value x 100% Percent Error Table T, reference tables

K = C + 273 C to K Table T, reference tables

Scientific Notation The number is written as a product of 2 numbers: - a number between 1 & 10 - a power of 10 Scientific Notation

Negative exponent so the number is between 0 and 1: 0.002 2 X 10-3

Positive exponent so the number is greater than 1: 500 5 X 102

All known digits plus 1 estimated digit. Significant Figures

5400.145 cm Decimal Present – Pacific side Start counting at 1st nonzero # 5400.145 cm 7 sig figs

0.0175 g Decimal Present – Pacific side Start counting at 1st nonzero # 0.0175 g 3 sig figs

4855 g Decimal Absent – Atlantic side Start counting at 1st nonzero # 4 sig figs

4000 mm Decimal Absent – Atlantic side Start counting at 1st nonzero # 1 sig fig

Significant Figures & Addition and Subtraction Answer has same number of decimal places as the addend with the least number of decimal places. Significant Figures & Addition and Subtraction

77.2 cm is correct! 28.0 cm 23.538 cm 25.68 cm But what do you report? + 77.218 cm

Significant Figures & Multiplication & Division Answer has same number of significant figures as the factor with the least number of significant figures. Significant Figures & Multiplication & Division

78 m2 is correct! 24 m X 3.26 m = 78.24 m2 But what do you report?