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51 Cards in this Set
- Front
- Back
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Define Chemistry |
The composition, structure, and properties of matter and the changes they undergo.
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Define Science |
A system of knowledge and the methods you use to find that knowledge.
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Examples of Homogeneous Mixtures |
Sugar water, Salt water, Pool water
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Examples of Heterogeneous Mixtures |
Sand and water, Cookie Dough, Salsa |
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Properties can be observed or measured without changing the composition of the substances in the material. |
Physical |
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Define Mass |
Amount of matter in an object. |
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Define Weight |
The measure of gravity on an object.
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Define Volume |
The amount of space that an object takes up.
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Define Density |
The ratio of a material's mass to its volume.
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What is the density of pure water? |
1 g/cm cubed |
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A(n) __________ is matter that cannot be broken down into simpler substances. |
Element |
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Symbol of Hydrogen |
H |
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Symbol of Oxygen |
O |
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Symbol of Sodium |
Na |
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Symbol of Gold |
Au |
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What two things do you need to know in order to calculate density? |
Mass over Volume |
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We represent and identify elements on the periodic table by their __________ |
Symbols |
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A(n) ________ is made of two or more elements chemically combined in a fixed proportion. |
Compound |
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Properties of a substance can be used to _______ that substances. |
Identify |
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Give an example of a phase change |
Melting and Freezing |
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The building blocks of all matter are _________. |
Atoms |
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The force that holds two atoms together is a _________ bond. |
Chemical |
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If you landed on the moon, your _________ would be different but your _________ would stay the same. |
Weight, Mass. |
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Give examples of Elements |
Gold, Aluminum, Sodium, and Oxygen. |
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Give Examples of Compounds |
Water, Vinegar, and Carbon Dioxide |
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Give examples of Solutions |
Tea, Lemonade, and Syrup |
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Give examples of Suspensions |
Sand and Water, Juices you have to shake, and blood |
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Give examples of Colloids |
Fog and Milk |
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A(n) ___________ retains some of the properties of its original substances. |
Mixture |
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Give example of a chemical change |
Fireworks, and bananas changing in color |
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____________ is a method used to separate the substances n a mixture based on boiling points. |
Distillation |
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Give some examples of physical properties |
Viscosity, Hardness, and Conductivity |
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A compound is made of groups of chemically joined atoms called ___________ |
Molecules |
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An element contains how many different types of atoms? |
One |
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Give some examples of chemical properties |
Flammability and Reactivity |
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Pure substances can be divided into to groups what are they? |
Compounds and Elements |
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How do you know if something will float or sink in water? |
If the object floats it is less then 1 and if it sinks it is more than 1. |
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The properties of a ___________ are NOT fixed and can vary. |
Mixture |
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A ___________ change occurs when some of the properties of a material change, but the substances in the material remain the same. |
Physical |
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__________ is a method used to separate the substances in a mixture based on size of the particles. |
Filteration |
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A(n) __________ does NOT retain some of the properties of its original substances. |
Compound |
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Give an example of a physical change |
Cutting hair, breaking glass, and tearing paper |
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___________ properties can be observed only when the substances in a sample of matter are changing into different substances. |
Chemical |
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In a(n) ___________, atoms are held together by chemical bonds. |
Compound |
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What are 3 indicators that a chemical change has taken place? |
Change in color, production of gas, and formation of a percipatate. |
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Give the SI unit for mass |
Grams |
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Give the SI unit for pounds |
Grams |
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Give the SI unit for volume |
Solid cm cubed Liquid mL |
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Give the SI unit for Density |
g/cm cubed |
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A change that produces a new substance is a ___________ change. |
Chemical |
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Phase changes are a ___________ change. |
Physical |
