elements, compounds, and mixtures

Question 1

what are elements?

Answer 1

1. pure substance
2. can’t be separated into simpler substances by chemical or physical means
3. each has a unique set of properties
4. classifies by their properties

Question 2

what are metals?

Answer 2

-shiny
-good conductors
-malleable
-ductile

Question 3

what are nonmetals?

Answer 3

-dull(no shine)
-poor conductors
-at room temp, only a few are solids that are brittle
-most are gases

Question 4

what are metalloids

Answer 4

-characteristics of metals and nonmetals
-semiconductors

Question 5

what are compounds?

Answer 5

1. Found in nature more often than pure elements
2. Have more than one element
3. Elements are chemically bonded to each other
   - Mg + 02 makes MgO
4. Pure substances that occur in fixed ratios by mass
   - 1g H to 8g of O in every water molecule
5. Can’t be separated by physical means
6. Have their own unique set of properties

Question 6

what are mixtures?

Answer 6

-two or more substances that are not chemically bonded

Question 7

mixtures can be separated by?

Answer 7

1. distillation
2. magnet
3. centrifuge
4. filtration
5. evaporation

Question 8

Homogeneous mixtures are called ____

Answer 8

solutions

Question 9

Heterogeneous mixtures include ____

Answer 9

suspensions

Question 10

____ are classified as heterogeneous in some books and homogeneous in others

Answer 10

Colloids

Question 11

meaning of solution

Answer 11

-Don’t scatter light/ light passes right thru
-Smallest solute particles

Question 12

meaning of suspension

Answer 12

-Settle out on standing
-Separate w/filter paper
-Largest particle size (seen)

Question 13

meaning of colloid

Answer 13

-Medium particle size
-Don’t easily pour