Chemistry - Scientific Process, Measurement & Calculations Quiz

SI unit, purpose and tool for mass

SI Unit = kilograms (kg)

Measures amount of matter

Tool = scale/triple beam balance

SI unit, purpose and tool for weight

SI Unit = pounds (lbs)

Measures the pull of gravity on matter

Tool = balance/scale

SI unit, purpose and tool for length

SI unit = meters (m)

Measures the distance between two points

Tool = meter stick

SI unit, purpose and tool for time

SI unit = seconds (s)

Measures continuous existence or passing events

Tool = stopwatch/timer

SI unit, purpose and tool for temperature

SI unit = Kelvin (K)

Measures the amount of heat

Tool = thermometer

SI unit, purpose and tool for area (derived unit)

SI unit = meters squared (m²)

Measures the amount of space on a surface (2D)

Tool = various measuring tools

SI unit, purpose and tool for volume (derived unit)

SI unit = meters cubed (m³)

Measures the amount of space an object/substance occupies (3D)

Tool = graduated cylinders, beakers, pipettes

SI unit, purpose and tool for density (derived unit)

SI unit = kilograms per meter cubed (kg/m³)

Measures the amount of matter in a given volume

Tool = Balance, graduated cylinders

Accuracy

How close a measurement comes to the actual value of what is measured (ex: how close are the darts to bullseye?)

Precision

1. In a data set, how close measurements are to each other.

2. In a single measurement, specific range of value or distance between two values.

(ex: how close are the darts to each other?)

How many sig figs are in 12.300?

5 sig figs (nonzero digits and zeroes after decimal point & after a nonzero digit)

How many sig figs are in 2030?

3 sig figs (nonzero digits, zero between nonzero digits, last zero only for placement)

How many sig figs are in 0.0517?

3 sig figs (zeroes before decimal point and nonzero numbers)

Hypothesis

A proposed explanation for a phenomenon that can be tested.

Law

A description of observed phenomenon (what, supported by math)

Theory

A repeatedly tested explanation of the natural world (why)

Independent variable

Part of experiment that is changed by experimenter, it affects another part

Dependent variable

Part of experiment that changes due to IV. (what is measured/observed)

1 base unit = ___ centi-

100

1 base unit = ____ mili-

1000

1 base unit = _____ micro

1,000,000

____ base unit = 1 kilo-

1000

____ base unit = 1 mega-

1,000,000

Beaker use

Holding, mixing, and heating liquids

Erlenmeyer flask use

Mixing, holding, heating liquids

Test tube use

Used to hold small amounts of substances

Graduated cylinder use

Measuring liquids

Pipette

Transferring liquids

Balance/scale

Measures mass

Thermometer

Measures temperature

Density =

mass/volume

Formula for percent error

|(Measured Value - Actual Value) / Actual Value| × 100%.