MATTER Chapter 2 1 Matter Anything that has

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MATTER Chapter 2. 1

MATTER Chapter 2. 1

Matter Anything that has mass and occupies space. Chemistry is the study of matter

Matter Anything that has mass and occupies space. Chemistry is the study of matter and how it

Pure Substances Uniform and definite composition Formed and separated chemically 2 types Elements &

Pure Substances Uniform and definite composition Formed and separated chemically 2 types Elements & compounds

Pure Substance Elements – a substance that cannot be broken down into smaller substances.

Pure Substance Elements – a substance that cannot be broken down into smaller substances. Atoms – smallest particle that has properties of an element. Both expressed by symbols

Compounds – a substance formed when two or more elements chemically combine together.

Compounds – a substance formed when two or more elements chemically combine together.

Molecules The smallest unit of a substance that exhibits all of the properties characteristic

Molecules The smallest unit of a substance that exhibits all of the properties characteristic of that substance (compound). Two or more atoms chemically combined

Chemical Formulas Ex. C 16 H 10 N 2 O 2

Chemical Formulas Ex. C 16 H 10 N 2 O 2

Mixtures A physical combination of more than one substance. (Two Types)

Mixtures A physical combination of more than one substance. (Two Types)

Homogeneous Mixtures Solutions Same throughout (miscible) ex: flat soda, salt water, black coffee

Homogeneous Mixtures Solutions Same throughout (miscible) ex: flat soda, salt water, black coffee

Heterogeneous Mixtures Not uniformly mixed, different parts Substances that need to be shaken ex:

Heterogeneous Mixtures Not uniformly mixed, different parts Substances that need to be shaken ex: noodle soup, granite

Classifying Liquid Mixtures: miscible-dissolve into each other immiscible-don’t mix into each other. You can

Classifying Liquid Mixtures: miscible-dissolve into each other immiscible-don’t mix into each other. You can see layers ex: oil and water.

Liquids Mix with Gas Can you think of a very common example? ? ?

Liquids Mix with Gas Can you think of a very common example? ? ?

MATTER AND ENERGY 2. 2

MATTER AND ENERGY 2. 2

Kinetic Theory 1. All matter is made of atoms and molecules that act like

Kinetic Theory 1. All matter is made of atoms and molecules that act like tiny particles.

Kinetic Theory 2. These tiny particles are always in motion. The higher the temperature,

Kinetic Theory 2. These tiny particles are always in motion. The higher the temperature, the faster the particles move.

Kinetic Theory 3. At the same temperature, heavier particles move slower than lighter particles.

Kinetic Theory 3. At the same temperature, heavier particles move slower than lighter particles.

Phases/States of Matter Gas liquid solid plasma

Phases/States of Matter Gas liquid solid plasma

States of Matter - Gases no definite shape. no definite volume. easy to compress.

States of Matter - Gases no definite shape. no definite volume. easy to compress. most random arrangement of particles. Most spread out.

Gases Property of gases is called pressure. the force exerted per unit area of

Gases Property of gases is called pressure. the force exerted per unit area of a surface

Liquids Definite volume no definite shape (takes shape of container) Difficult to compress disorderly

Liquids Definite volume no definite shape (takes shape of container) Difficult to compress disorderly arrangement on particles Close together

Liquids Property of Liquids is called viscosity. the resistance of a fluid to flow

Liquids Property of Liquids is called viscosity. the resistance of a fluid to flow

Solids Definite shape Definite volume Difficult to compress Orderly arrangement of particles close together

Solids Definite shape Definite volume Difficult to compress Orderly arrangement of particles close together Smallest amount of movement of particles.

Energy The ability to change state or move matter. Changing state does not change

Energy The ability to change state or move matter. Changing state does not change composition of the substance

Changes of State solid liquid gas

Changes of State solid liquid gas

Law of conservation of matter (mass) Matter (mass) cannot be created or destroyed. It

Law of conservation of matter (mass) Matter (mass) cannot be created or destroyed. It only changes its state or rearranges its atoms.

Law of conservation of energy Energy cannot be created or destroyed. It converts from

Law of conservation of energy Energy cannot be created or destroyed. It converts from one form to another during chemical or physica changes.

PROPERTIES OF MATTER 2. 3

PROPERTIES OF MATTER 2. 3

Physical Property A characteristic of a substance that can be observed or measured without

Physical Property A characteristic of a substance that can be observed or measured without changing the composition of the substance.

Physical Property Melting and freezing points. Solubility Dissolving of a solid into a liquid.

Physical Property Melting and freezing points. Solubility Dissolving of a solid into a liquid. Density

Why do some things float while others sink?

Why do some things float while others sink?

Density mass/volume (D=m/V) UNITS: mass – (g) 3 Volume – (m. L) or (cm

Density mass/volume (D=m/V) UNITS: mass – (g) 3 Volume – (m. L) or (cm ) density – (g/m. L) or (g/cm 3)

Density Buoyancy. The force with which a more dense fluid pushes a less dense

Density Buoyancy. The force with which a more dense fluid pushes a less dense substance upward. ex. floating ice.

Example An unknown metal is measured to be 36 grams. What is it’s density

Example An unknown metal is measured to be 36 grams. What is it’s density if it has a volume of 15. 5 cm 3? 3 D=m/v d= 36 g/ 15. 5 cm +1 +1 D = 2. 322 g/cm 3 +1 +1 Last point is sig. figs. 2. 3 g/cm 3 +1

Chemical Properties The way a substance reacts with others to form new substances with

Chemical Properties The way a substance reacts with others to form new substances with different properties.

Chemical Properties Flamability Reactivity corrosion

Chemical Properties Flamability Reactivity corrosion

Physical Changes A change in the physical form or properties of a substance that

Physical Changes A change in the physical form or properties of a substance that occurs without a change in composition.

Chemical Change A change that occurs when a substance changes composition by forming one

Chemical Change A change that occurs when a substance changes composition by forming one or more new substances.

Chemical Change 4 signs: Evolution heat or light Color change Formation of gas Formation

Chemical Change 4 signs: Evolution heat or light Color change Formation of gas Formation of a precipitate (solid residue)