Ch. 11 Lesson 1

What are properties of

?

elements• basic building blocks of matter

• combine to form all other kinds of matter

elements• can’t be broken into smaller pieces

• more than 100 elements

• most are metals

physical properties of metals

• conduct heat/electricity

• shiny

• bendable

Each element has its own properties.

shiny bendable

conducts heat

properties

physical chemical

can be measured

w/out changing

the material

material changesinto othermaterials

color, mass,volume

rust

Activity-What’s in Ned’s Head?• Some of you will be chosen to be “feelers” as we explore the contents

of “Ned’s head”. • It will be very important that you do not tell the class what is in the box. • Your task is to be the “eyes”, reporting to the “brain” (the class) what

you “see” (feel). • You may only tell the class properties, characteristics. or traits, things

that describe such as texture, size, hardness, etc., of the object inside the box.

• The duties of the class members during no discussion time are: 1. Write down all the clues you get from the feeler about the mystery object today.2. When you have as many clues as you can get, form a hypothesis and draw what you think the mystery object looks like.

• During class discussion time3. Show your picture and tell what you thought the mystery object was.4. Make adjustments to your hypothesis as the need arises during the discussion. 5. Help the class come to a consensus as to what the mystery object really was.

weight• measure of pull of gravity on object

• changes when pull of gravity changes

mass• amount of matter in object

• measured w/ balance in grams, milligrams, kilograms

volume•amount of space that an object takes up

Volume= L x W x H

• measured w/ graduated cylinder

volume

How can you measure the volume of an object with an irregular

shape, such as a rock?

• One way is to put the object in One way is to put the object in a graduated cylinder containing a graduated cylinder containing water and measure the change water and measure the change in the volume of the water.in the volume of the water.

•Answer is in mL not Answer is in mL not cmcm33

density• measure of amount of matter in given volume

•Density= Mass

Volume

densityIf each marble has the same mass,

which box would weigh more? Why?

The box that has more marbles has more mass per unit of volume.

Density= Mass/Volume

Object Mass Length Width Height Volume

science

book

g cm cm cm cm3

10 pennies g cm cm cm mL

block of wood

g cm cm cm cm3

pyrite g cm cm cm cm3

buoyancy•when something floats-

density < (less than) 1

Pumice has a density less than water’s density.

Yen has a density less than water’s density.

Ironwood has a density greater than water’s density.

Canister Contents of

canister

Mass (g)

Volume

(cm3)

Density

(g/cm3)

1

float2

hover3

sink

Activity- Dunkin for Density

Analysis and Results:1. What is the mass of an empty film

canister?

2. Did the mass of the canister change at all? Explain.

3. Did the volume of the canister change at all? Explain.

4. What caused each canister to stay at their level in the water?

5. Write 2-3 sentences on what you learned.

Time to review

more than 100

•How many elements are

there?

How do you calculate density?•Density= Mass

Volume

Most elements in the periodic table are __________.metals

mass•amount of matter in an object

less

•When something floats, it’s density is ______ than the liquid it is floating in.

weight•measure of the pull of gravity on

an object

balance•What tool is used to measure the mass of an object?