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51 Cards in this Set

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Define Chemistry

The composition, structure, and properties of matter and the changes they undergo.


Define Science

A system of knowledge and the methods you use to find that knowledge.


Examples of Homogeneous Mixtures

Sugar water, Salt water, Pool water


Examples of Heterogeneous Mixtures

Sand and water, Cookie Dough, Salsa

Properties can be observed or measured without changing the composition of the substances in the material.

Physical

Define Mass

Amount of matter in an object.

Define Weight

The measure of gravity on an object.


Define Volume

The amount of space that an object takes up.


Define Density

The ratio of a material's mass to its volume.


What is the density of pure water?

1 g/cm cubed

A(n) __________ is matter that cannot be broken down into simpler substances.

Element

Symbol of Hydrogen

H

Symbol of Oxygen

O

Symbol of Sodium

Na

Symbol of Gold

Au

What two things do you need to know in order to calculate density?

Mass over Volume

We represent and identify elements on the periodic table by their __________

Symbols

A(n) ________ is made of two or more elements chemically combined in a fixed proportion.

Compound

Properties of a substance can be used to _______ that substances.

Identify

Give an example of a phase change

Melting and Freezing

The building blocks of all matter are _________.

Atoms

The force that holds two atoms together is a _________ bond.

Chemical

If you landed on the moon, your _________ would be different but your _________ would stay the same.

Weight, Mass.

Give examples of Elements

Gold, Aluminum, Sodium, and Oxygen.

Give Examples of Compounds

Water, Vinegar, and Carbon Dioxide

Give examples of Solutions

Tea, Lemonade, and Syrup

Give examples of Suspensions

Sand and Water, Juices you have to shake, and blood

Give examples of Colloids

Fog and Milk

A(n) ___________ retains some of the properties of its original substances.

Mixture

Give example of a chemical change

Fireworks, and bananas changing in color

____________ is a method used to separate the substances n a mixture based on boiling points.

Distillation

Give some examples of physical properties

Viscosity, Hardness, and Conductivity

A compound is made of groups of chemically joined atoms called ___________

Molecules

An element contains how many different types of atoms?

One

Give some examples of chemical properties

Flammability and Reactivity

Pure substances can be divided into to groups what are they?

Compounds and Elements

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.

The properties of a ___________ are NOT fixed and can vary.

Mixture

A ___________ change occurs when some of the properties of a material change, but the substances in the material remain the same.

Physical

__________ is a method used to separate the substances in a mixture based on size of the particles.

Filteration

A(n) __________ does NOT retain some of the properties of its original substances.

Compound

Give an example of a physical change

Cutting hair, breaking glass, and tearing paper

___________ properties can be observed only when the substances in a sample of matter are changing into different substances.

Chemical

In a(n) ___________, atoms are held together by chemical bonds.

Compound

What are 3 indicators that a chemical change has taken place?

Change in color, production of gas, and formation of a percipatate.

Give the SI unit for mass

Grams

Give the SI unit for pounds

Grams

Give the SI unit for volume

Solid cm cubed Liquid mL

Give the SI unit for Density

g/cm cubed

A change that produces a new substance is a ___________ change.

Chemical

Phase changes are a ___________ change.

Physical