Elements and Compounds Flashcards
What is an element
A pure substance made of one type of atom
How many elements are there
118
Where are all the elements
On the periodic table
What is a compound
Two or more different types of atoms chemically bonded together
What is a mixture
Two or more types of elements or compounds not chemically bonded together
What is a molecule
Two or more atoms chemically bonded together. They can be the same type or different
Evidence of chemical reactions
Temperature change, Light given off, Colour change, Gas produced (bubbling) ,New substance formed
What is effervescence
Another name for bubbling
What is a chemical change
A change that can’t be reversed because the atoms have been arranged into new substances
What is a physical change
A physical change is a change that can be reversed because a new substance hasn’t been created
Is melting chocolate a physical or chemical reaction
It is a physical reaction
Is making toast a physical or chemical reaction
It is a chemical reaction
