Today’s Agenda…10/6 Bellringer: What group of elements are unreactive? What does this mean? Get your clickers! Compounds and Mixtures 1 day until fall break!

What do you think? True or False (Review questions) Elements cannot be broken into simpler substances. Compounds are made up of two or more atoms of the same element. Water is an example of a compound. Salt is an example of an element.

What do you think? True or False (Preview Questions) Mixtures cannot be separated. A physical change occurs when compounds are formed. The elements in a compound keep their original properties. You can see all the parts in a homogeneous mixture.

Compounds vs. Mixtures Compounds and Mixtures are not the same type of substance! Today we will investigate the difference between these two substances. We will investigate… Their composition How they are joined Their properties If and how they can be separated Examples

Composition Mixture Compound Varies You can change the amount of each substance in a mixture Compound Definite You cannot change the amount of each element in a compound

Joined Mixture Compound A physical change occurs when substance come together The substances are NOT chemically joined together Compound A chemical change occurs when substance come together The substances are chemically joined together

Separation Mixture Compound Each substance is easily separated from the mixture Sorting, sifting, filtering, evaporation Compound Can only be separated into elements using chemical reactions

Properties Mixture Compound Each substance keeps its own properties The compound has different properties than the elements it contains

Examples Mixture Compound Air Salt water Soup Water Salt Carbon dioxide

Chex Mix vs. Salt Water What is the difference? Which one is easier to separate? Chex mix is a heterogeneous mixture while salt water is a homogenous mixture or solution

Homogeneous vs. Heterogenous Homogeneous mixture - “the same throughout”, meaning you cannot see the different parts in the mixture, like salt water or air Heterogeneous mixture – you can see the different parts in the mixture, like pizza and vegetable soup

What did you learn? True or False Mixtures cannot be separated. A physical change occurs when compounds are formed. The elements in a compound keep their original properties. You can see all the parts in a homogeneous mixture.