Lec 2 - Basic Principles

Question 1

What is meant by accuracy?

Answer 1

Measure of how close an experimental value is to
the true or accepted value

Question 2

What is meant by precision?

Answer 2

Degree of uncertainty in a measurement

Question 3

Define atom

Answer 3

The smallest particle having well-defined chemical
properties

Question 4

Define molecule

Answer 4

Collection of atoms chemically bonded togeth

Question 5

What is an element?

Answer 5

Consists of one or more atoms of the
same type (cannot be broken down into simpler substances
having the same properties)

Question 6

What is a compound?

Answer 6

Molecule containing atoms of, at least, two
different types (chemically separable into its individual
elements)

Question 7

What’s the difference between intensive and extensive properties?

Answer 7

Intensive property: does not depend on the amount of
substance and is not additive (e.g. density, temperature)

Extensive property: depends on the amount of substance
and is additive (e.g. mass, volume)