Chem Lab Final Study Guide

Precision

Internal agreements of repeated measures

Length

Meter

Temperature

Kelvin

Mass

Kilogram

Energy

Joule

Volume

Cubic Meter

Mixture

Combination of two or more substances

Components

Substances making up a mixture

Homogeneous

Uniform in composition

Heterogeneous

Not uniform in composition

Decantation

Seprating a liquid from a solid by pouring liquid from the solid

Filtration

Separating a solid from a liquid using a filter

Extraction

Separaitng a substance by dissolving the substance

Sublimation

Solid-Gas-Solid without entering the liquid state

NACL

Sodium Chloride

NAOH

Socium Hydroxide

Compound

Composed of molecules

Molecules

single object or unit

Drop of water

2×10²1

Avogadro’s number

6.0210x²3

Solution

Homogeneous mixture of two or more substances

Solvent

Substance present in good amount

Solute

substance in smaller amount

Standardization

Determining the concentration of a solution

Titration

Measuring volume of solution required to react with another solution

what lab instrument is used to measure mass?

balance/scale

Equation for Density?

d=m/v

Molarity Equation

M=n(moles of solute)/l(volume of solution)

Pipet

Glass vessels that are constructed and calibrated to deliver a precisely known volume of liquid at a given temperature

Impure Substance

if substance amounts exceeds the amounts of other substances in mixture

What is the concentration of a solution calculated from

the amount of solute present

Percentage Composition

Number of atoms(AW)/FW of compound x 100

Empirical Formula

formula obtained from percentage composition

Atomic Weight

atomic mass

End Point

Parallax

apparent position of an object changes due to the observer's different viewing angles, leading to inaccurate readings

How do you find the mean?

add all numbers and divide by number of trials