Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
25 Cards in this Set
- Front
- Back
|
CHEMISTRY
|
is the science that deals with matter: the structure and properties of matter and the transformations from one form of matter to another (page 2)
|
|
|
Transformations
|
are known as chemical reactions
|
|
|
Matter
|
anything that has mass and takes up space
|
|
|
Examples of matter:
|
water, iron, wood, milk, oxygen, food, and air
|
|
|
Matter can be
|
visible and invisible
|
|
|
Examples that are not matter:
|
(These have no mass and do not take of space)
light, gravity, electricity, and heat |
|
|
Things that take up space is known
|
to have volume
|
|
|
Volume
|
amount of space taken up by an object
|
|
|
Mass
|
amount of matter in object is independent of locations
|
|
|
Weight
|
Force due to the gravity of an object
|
|
|
Democritus
|
He believed that all matter is made of very small particles too small to see. These particles are called atoms. He believed that atoms were indivisible and indestructible.
|
|
|
Zeno
|
He did not believe in atoms. He believed that matter is infinitely divisible.
He believes you could take a piece of paper and divide it. |
|
|
Matter can be divided into two classes:
|
Pure substances and mixtures
|
|
|
Name 3 types of matter?
|
Elements, compounds, and mixtures
|
|
|
What can a pure substance be?
|
Element or a compound
|
|
|
What can a mixture be?
|
Homogeneous or heterogeneous
|
|
|
What is a pure substance?
|
Fixed composition; cannot be further purified
|
|
|
What is a mixture?
|
A combination of two or more pure substances () that are physically combined (These mixtures can be separated by physical means) blood butter gas air earth
Example: Na and sand is a mixture. When dissolve in water you can filter out the sand and when the water evaporate you can recover the salt |
|
|
Element
|
A substance that consists of identical atoms (They Cannot be subdivided by chemical or physical means)
|
|
|
What does elements form when they are chemically combine?
|
Compounds
|
|
|
Compound
|
pure substance made up of two or more elements that chemically react together
|
|
|
Compounds
|
can be separated into elements by chemical means
|
|
|
Atoms
|
Smallest particle of elements
|
|
|
Element
|
made up of only one kind of atom
|
|
|
What happens if 2 elements do not react together?
|
They become a mixture
|
