Structure of Atom and Periodic Table
Melting point of Rubidium is ____ than that of Potassium
Less than
What type of reaction occurs when a more reactive metal replaces a less reactive metal from its compound?
Displacement reaction
A substance lowers activation energy without changing the overall energy difference between reactants and products. What is it?
Catalyst
Noble gases ( Group VIII elements ) are ____atomic.
Monoatomic
The tendency of an element to participate in chemical reactions?
Reactivity
The rate of reaction can be found out from the _____ of the graph.
Slope
Cl- has __ electrons in the last shell.
8
Which metal is commonly used to extract iron from iron oxide in thermite welding?
Aluminium
Rate of a reaction ________ upon dilution ( adding more water )
Decreases
An element has electronic structure 2,8,2. What is its period?
3
Galvanisation is a process of coating ____ over ____, and gives protection through an electrical contact.
Zinc over Iron
What is the term for the minimum successful collision energy?
Activation energy
Which subatomic particle determines the mass number but not the atomic number?
Neutron
What is the chemical formula of rust?
Hydrated Iron (III) Oxide
A reaction graph becomes progressively less steep. What happens to the reaction rate?
Decreases