Unit 2 Chemistry

salt

compound

dr pepper

homogeneous

a solution of propanol and water

homogeneous

milk

heterogenous

gold

element

banana

heterogeneous

diamond

element

A shirt scorches when you leave the iron on one spot too long.

chemical

The tires on your car seem to be getting flat in very cold weather.

physical

Your grandmother's silver tea set gets black with tarnish over time.

chemical

Spray

on oven cleaner converts grease in the oven into a soapy material.

An ordinary flashlight battery begins to leak with age and can't be recharged.

chemical

Acids produced by bacteria in plaque cause teeth to decay.

chemical

Sugar will char if overheated while making homemade candy.

chemical

Your snowman melts on a sunny day.

physical

Chlorine laundry bleaches will sometimes change the color of brightly colored clothing.

chemical

Acetone is used to dissolve and remove nail polish.

physical

The substance is a silvery white, lustrous metal.

physical

It melts at 649 oC and boils at 1105 oC.

physical

Its density at 20 oC is 1.738 g/cm3.

physical

The substance burns in air, producing an intense white light.

chemical

It reacts with chlorine to give a brittle white solid.

chemical

The substance can be pounded into thin sheets or drawn into wires.

physical

It is a good conductor of electricity.

physical

the vaporization of solid carbon dioxide.

physical

the explosion of solid TNT

chemical

the aging of an egg with a resultant unpleasant smell

chemical

the formation of a solid when honey is cooled

physical

corrosion of aluminum metal.

chemical

melting of ice

physical

pulverizing (crushing) an aspirin

physical

digesting a candy bar

chemical

explosion of nitroglycerin

chemical

Hydrofluoric acid attack glass, and is used to etch calibration marks on glass laboratory utensils.

chemical

Marble statues deteriorate when attacked by acid rain.

chemical

Soap lathers when you wash your hands.

physical

Grape juice ferments when yeast is added.

chemical

Hydrogen peroxide fizzes when applied to a wound

chemical

Isopropyl alcohol feels cool as it evaporates from the skin.

physical

the mercury used in a thermometer

element

gasses in the air

homogeneous

beach sand

heterogeneous

concrete

heterogeneous

aluminum foil

element

sugar

compound

a solution of ethanol and water

homogeneous

the atmosphere

heterogeneous

a carbonated soft drink (such as Sprite)

homogeneous

iodine crystals

element

salt water

homogeneous

carbon dioxide

compound

gasoline

homogeneous

The density of water is 1.0 g/cm3.

physical

Diamonds are a very hard substance.

physical

The tree is 8 meters high.

physical

Sodium reacts easily with water.

chemical

Copper conducts electricity.

physical

Water is a liquid at 15 oC.

physical

The color of a lemon is yellow.

physical

Gold is non

flammable.

Alka

Seltzer reacts with water to form carbon dioxide gas.

Iron reacts with oxygen to produce rust.

chemical

The color of the ball is green.

physical

Propane is flammable.

chemical

Oxygen is a gas at 0 oC.

physical

Argon is non

reactive.

Silver will tarnish when exposed to air.

chemical

Nitrogen is a colorless gas.

physical

Unzipping a zipper

physical

Burning wood

chemical

Digesting an apple

chemical

Framing a Star Wars poster

physical

Lighting a candle

chemical

Waxing a wooden floor

physical

Melting iron

physical

Breaking glass

physical

Mixing salt and water

physical

Distilling water

physical

Freezing water

physical

Rotting log

chemical

What are diatomic molecules?

Pure elements that contain more than one atom bonded together. (In Twos)

Name the diatomic molecules

H2, N2, O2, F2, Cl2, Br2, I2 *use h7 as the memorization technique

brass

homogeneous (Alloy)

bronze

homogeneous

stainless steel

homogeneous

what is distillation

how easily a substances in a mixture vaporize. (Used in homo)

what is filtration

used when a mixture is made up of a solid and a liquid. (Used for het)

example of distillation

sugar water. evaporating the water and leaving the sugar behind.

example of filtration

rocks and water. filter out the big rocks and have only water left over.

what is density

the amount of matter present in a given volume of a substance (how much stuff is in something and how much space it takes up)

equation for density

mass/volume

What is matter

anything that takes up space and has mass

examples of physical properties (From study guide)

color, density, magnetism, melting point, disolving, conducts electricty, boiling point

example of chemical properties (From study guide)

Reactivity, corrosion, flammability

frying an egg

chemical

fruit rotting

chemical

plants using CO2 and H2O to for O and sugar

chemical

arsenic

element

mud

heterogeneous

ocean

heterogeneous