Chemistry Quiz 09/08/2025

Beaker

An open cylindrical container with a pouring lip; used for mixing larger amounts of substances

Bunsen Burner

Uses fire for heating

Test Tube

Container for reactions

Test Tube Rack

Holds test tubes

Graduated Cylinder

Used to measure volumes

Mortar and Pestle

For crushing solids

Forceps

used to pick up or hold small items

Ring Stand with ring

Used as a support; Rings and clamps attach to the stand

Spatula or Scoopula

Used to transfer solids

Tongs/Crucible Tongs

Used to pick up and hold substances; For moving materials; For use with crucibles

Evaporating Dish

Used to evaporate liquids from a mixture

Funnel

Liquid transfer; Separation techniques

Beaker Tongs

For moving hot beakers

Watch Glass

Used as a cover or sample plate

Stirring Rod

Used to agitate liquids or mixtures

Test Tube Brush

Used to clean glassware

Wire screen/wire gauze

Support used to hold glassware when being heated

Test Tube Clamp/Tongs

Used to hold a test tube while heating

Striker

Used to light a Bunsen Burner

Erlenmeyer Flask

For heating and holding reactions. Has tapered sides

pipet

Used to transfer small amounts of liquid

hot plate

An electrical device used to heat things up.

electronic balance

used to measure mass

Ruler

used to measure length

Weighing dish

holds solids while weighing

Chemical Properties

Properties that indicate how a substance reacts with other substances. These properties are only observed when the substance undergoes a chemical change. (flammable combustible burnable.” reacts with”.)

Physical Properties

Properties that can be measured or observed without changing the identity (or composition) of a substance. The chemical make up is not changing when these properties are observed. (color, odor, texture, taste, freezing point.)

Physical Changes

Changes an appearance without changing composition (cutting, breaking, pulverizing.) changes in state, such as melting, freezing, boiling, subliming (going from solid to gas)

Chemical changes

One or more substances react to form new substances with different chemical and physical properties. The beginning substance is different than the ending substance.(resting, burning, core, digesting, respiration, decaying.)

Signifcant figures

digits on the number that contribute to its precision, including all non-zero digits, any zeros between them, and any trailing zeros in a decimal.

Significant figure rules

1. All non-zero digits are significant

2. Leading zeros are never significant (zeros to the left)

3. Captive zeros are always significant (zeros in the middle)

4. Trailing zeros are sometimes significant (zeros at the end), they are significant if the number contains a decimal point. They are not significant if the number does not contain a decimal point.

Volume by displacement

A method for measuring the volume of an irregularly shaped object by submerging it in water and calculating the volume of the water displaced.

Reading a meniscus

Observing the curve of a liquid surface and a graduated cylinder to accurately measure liquid volume.

Constructing a data table

Organizing data and rows and columns to systematically display and analyze information.

Heterogeneous mixture

does not have a uniform composition. Parts of the mixture can be physically seen and picked out. (cereal, pizza, salad.)

Homogeneous mixture

has a uniform composition. Parts of the mixture cannot be picked out of the mixture. (sugar, water, milk.)

Compound

formed one elements chemically combine (H2O, CO2, and O2.)

Element

found on the periodic table (approx. 118)

Data taking examples

1. Accurate, precise = 50.00g,50.00g,50.00g

2. Not accurate, precise = 32.18g,32.18g,32.18.

3. Accurate, precise = 50.00g,49.99g,50.0g

Important formulas

1. % error = I R - E I / R x 100

2. D = M / V