Science chemistry Periodic table and energetics Flashcards
What does the periodic table of elements show?
All the elements arranged in rows (periods) and column (groups)
Which side of the periodic table
contains metals?
Left side of staircase line
Which side of the periodic table
contains non-metals?
Right side of staircase line
The modern periodic table is arranged
in order of ?
Atomic number
Early periodic tables were arranged in
order of?
Atomic weight
Why did Mendeleev leave gaps in his
periodic table?
Mendeleev left gaps for undiscovered elements
Elements in the same group have
Similar chemical properties
What is a property of a substance?
A characteristic of a substance
List four properties of metals
Good conductors of electricity and heat, high, melting point, malleable and ductile
List three properties of non-metals
Poor conductors of electricity and heat, low
melting point and brittle
Exothermic reaction
It is a reaction in which energy is given out to the surroundings
During an exothermic reaction, the
temperature of the surroundings
Increases
endothermic reaction
It is a reaction in which energy is taken in from the surroundings
During an endothermic reaction, the
temperature of the surroundings
Decreases
Describe how to calculate a change in
temperature.
final temp (°C) – initial temp (°C) = change in temp(°C)
