2 Elements Compounds and Mixtures Flashcards
(15 cards)
What is an element?
An element is a pure substance that cannot be broken down into simpler substances by chemical means.
True or False: An element can exist in different forms known as allotropes.
True
What is a compound?
A compound is a substance formed when two or more elements are chemically bonded together.
Fill in the blank: A mixture is a combination of two or more substances that are not _____ combined.
chemically
What is the main difference between a compound and a mixture?
In a compound, elements are chemically bonded, while in a mixture, they are physically combined.
True or False: Mixtures can be separated by physical methods.
True
What is a homogeneous mixture?
A homogeneous mixture is a mixture that has a uniform composition throughout.
What is a heterogeneous mixture?
A heterogeneous mixture is a mixture that has a non-uniform composition, with distinct phases or layers.
Multiple Choice: Which of the following is an example of a compound? A) Air B) Water C) Salad
B) Water
What is the smallest unit of an element that retains its properties?
An atom
Fill in the blank: A _____ is made up of two or more different elements bonded together.
compound
True or False: All mixtures are homogeneous.
False
What do we call a substance that can be separated into simpler substances by chemical reactions?
A compound
Multiple Choice: Which of the following is a characteristic of an element? A) It can be broken down B) It is made of atoms C) It has variable composition
B) It is made of atoms
What type of mixture is saltwater?
Homogeneous mixture
