Download - Section 1 Composition of Matter
![Page 1: Section 1 Composition of Matter](https://reader031.vdocuments.site/reader031/viewer/2022020619/61e26dcc0dd6666ac92173d5/html5/thumbnails/1.jpg)
Ch 18 Section 1
Composition of Matter
![Page 2: Section 1 Composition of Matter](https://reader031.vdocuments.site/reader031/viewer/2022020619/61e26dcc0dd6666ac92173d5/html5/thumbnails/2.jpg)
Pure Substance Pure substance is a type of matter made with a
fixed composition.
Substance can either be an element or a compound.
Ex: helium, aluminum, water, and salt.
![Page 3: Section 1 Composition of Matter](https://reader031.vdocuments.site/reader031/viewer/2022020619/61e26dcc0dd6666ac92173d5/html5/thumbnails/3.jpg)
Element All substances are built from atoms.
If all the atoms are the same then the substance is an element.
90 elements are found on earth
More than 20 elements have been made in a laboratory.
![Page 4: Section 1 Composition of Matter](https://reader031.vdocuments.site/reader031/viewer/2022020619/61e26dcc0dd6666ac92173d5/html5/thumbnails/4.jpg)
Compounds A pure substance in which two or more elements
are combined in a fixed proportion.
Ex: salt (NaCl), water (H2O)
![Page 5: Section 1 Composition of Matter](https://reader031.vdocuments.site/reader031/viewer/2022020619/61e26dcc0dd6666ac92173d5/html5/thumbnails/5.jpg)
Molecules Particles consisting of two or more atoms that are
bonded together.
![Page 6: Section 1 Composition of Matter](https://reader031.vdocuments.site/reader031/viewer/2022020619/61e26dcc0dd6666ac92173d5/html5/thumbnails/6.jpg)
Mixture Heterogeneous Mixture- a mixture in which
materials can be distinguished easily. Ex: pizza
Homogeneous Mixture- a mixture in which the substances are mixed evenly throughout.
Ex: Unopened soda
![Page 7: Section 1 Composition of Matter](https://reader031.vdocuments.site/reader031/viewer/2022020619/61e26dcc0dd6666ac92173d5/html5/thumbnails/7.jpg)
Solution A homogeneous mixture with particles so small
that they will never settle to the bottom.
![Page 8: Section 1 Composition of Matter](https://reader031.vdocuments.site/reader031/viewer/2022020619/61e26dcc0dd6666ac92173d5/html5/thumbnails/8.jpg)
Colloids A type of mixture with particles that are larger than
those in solutions but not heavy enough to settle out.
Tyndall effect
![Page 9: Section 1 Composition of Matter](https://reader031.vdocuments.site/reader031/viewer/2022020619/61e26dcc0dd6666ac92173d5/html5/thumbnails/9.jpg)
Suspension A heterogeneous mixture containing a liquid in
which visible particles settle. Ex: Pond water
![Page 10: Section 1 Composition of Matter](https://reader031.vdocuments.site/reader031/viewer/2022020619/61e26dcc0dd6666ac92173d5/html5/thumbnails/10.jpg)