Elements, Compounds And Mixtures Flashcards
What is an element?
An element is made from only one type of atom.
How many known elements are there in the periodic table?
Roughly 100.
What is a compound?
A compound is a substance where two or more atoms (of different elements) are chemically joined.
What is a mixture?
A mixture is a substance that contains two or more elements or compounds that are not chemically joined together.
Identify whether the following are elements or compounds: Iron, Iron Oxide, Nitrogen, Oxygen, Carbon, Aluminium, Hydrochloric Acid, Water.
Elements: Iron, Nitrogen, Oxygen, Carbon, Aluminium. Compounds: Iron Oxide, Hydrochloric Acid, Water.
What is a polymer?
A polymer is a molecule made of thousands of smaller molecules in a long chain.
Give an example of a natural polymer.
Starch or proteins.
Give an example of a man-made polymer.
Plastics.
Fill in the blank: A _______ is a substance where two or more atoms of different elements are chemically joined.
compound.
True or False: A mixture contains elements or compounds that are chemically joined.
False.
What are the components of water in terms of atoms?
Two hydrogen atoms and one oxygen atom.
What is the chemical formula for Hydrochloric Acid?
HCl.
What is the chemical formula for Sodium Hydroxide?
NaOH.
What is the chemical formula for Ammonia?
NH3.
What is the boiling point of a substance indicated in the scale?
-162°C.
