How do hot air balloons work?

Intro to Matter

Matter- anything with mass and volume Mass- how much matter (stuff) is in an object

Mass vs. Weight Weight- measure of gravitational force Objects with greater mass have a greater gravitational force so they weigh more Weight can change depending on location Mass stays the same Mass vs. Weight Gizmo

Volume Volume- how much space something takes up Regular solids- use math formulas (example- L x W x H) Liquids- use graduated cylinder Gas- volume of the container

Irregular solids- use water displacement Sketch this!

Density How much mass is in a specific space How heavy something is compared to its size Density of a substance is the same no matter how much of the substance you have

Examples D= ? M= 80 g V= 2 cm3 D= 20 g/mL M= 100 g V= ? D= 4 g/cm3 M= ? V= 15 cm3

Properties of Matter

Physical Properties Characteristics that can be observed and measured without changing the identity of a substance Use your 5 senses Describe the substance

Common physical properties Density Electrical conductivity- how electrical current moves through a substance Solubility- ability to dissolve in another substance Thermal conductivity- how well it transfers heat

Malleability- capable of being shaped Color Luster- how shiny it is Magnetic attraction Melting point Boiling point

Identified by changes they produce Chemical properties Describe a substance’s ability to change into another substance with different properties Identified by changes they produce

Common chemical properties Flammability- ability to burn Reactivity with other substances ex: iron and oxygen form rust

Physical & Chemical Properties (Make 1 for each) Definition Examples (at least 3) Picture Explain your picture using complete sentences

Changes in mater

Physical Changes Changes in matter that do not change the identity of the matter Can usually be undone

Signs of a physical change Change in size, shape, state, sometimes color Dissolving, mixing, crushing, bending

Chemical Changes Changes in matter that change the identity of the substance. A substance changes into a different substance Can’t be undone

Signs of a chemical Change Fizzing/foaming Color change (sometimes) Heat, sound, odor, or light produced

Examples Is it physical or chemical? Breaking a pencil in half Campfire Tearing paper Mixing kool-aid Rusty nail Ice melting Digesting food Spoiled milk