Elements, mixtures and compounds Flashcards
(18 cards)
element
one type of atom
compound
different atoms joined together
mixture
different atoms that are not chemically bonded together.
What is an element?
An element is a pure substance that cannot be broken down into simpler substances by chemical means.
True or False: A mixture contains two or more different substances that are not chemically combined.
True
Fill in the blank: A _____ is a combination of two or more elements that are chemically bonded together.
compound
Which of the following is an example of a compound? a) Oxygen b) Water c) Salt d) Both b and c
d) Both b and c
What is the smallest unit of an element that retains the properties of that element?
Atom
True or False: Mixtures can be separated by physical means.
True
Define a homogeneous mixture.
A homogeneous mixture is a mixture that has a uniform composition and appearance throughout.
What distinguishes a heterogeneous mixture from a homogeneous mixture?
A heterogeneous mixture has a non-uniform composition, where the different components can be visibly distinguished.
Provide an example of an element.
Gold (Au)
What are the two main types of mixtures?
Homogeneous and heterogeneous mixtures.
True or False: Compounds can only be formed by the combination of two or more different elements.
True
What is a chemical formula?
A chemical formula is a symbolic representation of a compound that shows the elements and their proportions.
Fill in the blank: The process of separating a mixture into its components is called _____.
filtration
What is the primary difference between an element and a compound?
An element is a single substance, while a compound is made up of two or more elements chemically bonded together.
Which of the following is NOT a characteristic of compounds? a) Fixed composition b) Variable composition c) Chemical bonds d) New properties
b) Variable composition
