Module 3

Question 1

atomic model of substances

Answer 1

Shows how particles in our universe have different atomic structures

Question 2

elementary substances

Answer 2

Substances that cannot be composed into simpler states with any known chemical procedures
- These substances cannot be split into simpler stable substances
- Only made of one type of atom

Question 3

chemical compounds

Answer 3

Substances that can be split into simpler stable substances (elementary substances)

Question 4

reading the periodic table

Answer 4

Elements in the same column are considered to be in the same “group” while elements in the same row belong to the same “period”

Question 5

characteristics of metals

Answer 5

• Usually solid at room temperature
• Conduct heat and electricity well

Question 6

characteristics of nonmetals

Answer 6

• Usually gases at room temperature
• Conduct heat and electricity poorly

Question 7

characteristics of metalloids / semimetal elements

Answer 7

• ## share characteristics with both metals & nonmetals

Question 8

ionic compounds

Answer 8

• Typically solids with high melting points
• Conduct electricity while dissolved in water or while in molten state
• Result from the chemical combination of metallic and nonmetallic elements
• Not composed on individual molecules but of crystalline structures of electrically charged particles

Question 9

molecular compounds

Answer 9

• Exist in different states of matter
• Generally conduct electricity poorly
• Often result from the chemical combination of nonmetallic elements

Question 10

ions

Answer 10

molecules or atoms with net electrical charges

Question 11

cations

Answer 11

positively charged ions

Question 12

anions

Answer 12

negatively charged ions

Question 13

How to find out the number of particles in a container?

Answer 13

• Because particles are so small, we use mass