chapter 4: elements, compounds, and mixtures

Question 1

definition of element

Answer 1

a pure substance that cannot be broken down into 2 or more simpler substances by chemical processes

Question 2

definition of atom

Answer 2

the smallest particle of an element that has the chemical properties of that element

Question 3

definition of molecule

Answer 3

a group of 2 or more atoms that are chemically bonded

Question 4

definition of compound

Answer 4

a pure substance that contains 2 or more elements that are chemically bonded in a fixed ratio

Question 5

definition of mixture

Answer 5

mixtures are made up of two or more substances that are not chemically bonded

Question 6

what is a metalloid

Answer 6

an element which has properties of metals and non-metals

Question 7

properties of METAL
-appearance
-physical state at r.t.p.
-melting and boiling points
-heat and electrical conductivity
-ductility and malleability

Answer 7

• shiny (lustrous)
• mostly solids (except mercury)
• high (except for sodium, potassium, and mercury)
• good
• ductile (can be drawn into wires)
• malleable (can be hammered into different shapes without breaking)
• sonorous (makes a ringing sound when struck)