Chemical Reactions and Bonding

Matter

any material that has mass and takes up space

2 types of matter

Pure substances and Mixtures

Pure substance

Matter with a fixed or definite composition

Element

A substance that contains only one type of matter, Cannot be broken down without changing properties, All atoms are the same

Compound

Two or more different elements bonded together in a set ratio, Can be broken down into simpler substances

Molecule

Atoms bonded together within an element

Are mixtures pure substances, why?

No, because they are not chemically combined

Mixture

Two or more substances that are physically mixed together, Can separate with physical processes

Homogenous

And make sure that stays the same throughout i.e. solutions

Heterogeneous

A mixture you can see the different parts of I.e. chocolate chip cookie

Atom

The smallest particle of an element that retains the characteristics

Physical property

Something that can be observed without changing the identity of a substance, Use five senses

Intrinsive property

Independent of the amount of substance present I.e. scent

Extensive property

Depends on the amount of substance present i.e. mass

Physical change

A change in a physical property ( appearance or state), Identity of the substance is not changed

What are the three states of matter?

Solid, liquid and gas(+ vapor)

Chemical property

The ability or inability of a substance to react with another substance I.e. ability to rust

Chemical change

When a new substance is made( Chemical reaction) I.e. bubbles

Masses neither created nor destroyed in a chemical reaction (Mass of reactants = mass of products)

Law of conservation of mass

Signs of chemical change

Color change, Production of gas, Light emitted, switch forms, Absorb or release heat