classification of matter (pure substances vs. mixtures) Flashcards
classification of matter (pure substances vs. mixtures)
What are the two main categories of matter?
Pure substances and mixtures.
True or False: A pure substance has a uniform and definite composition.
True.
Fill in the blank: Mixtures can be classified into ______ and ______ mixtures.
homogeneous and heterogeneous.
What is a homogeneous mixture?
A mixture that has a uniform composition throughout.
Give an example of a pure substance.
Water (H2O).
What distinguishes a heterogeneous mixture?
It consists of visibly different substances or phases.
Multiple Choice: Which of the following is a characteristic of pure substances? A) Variable composition B) Fixed composition C) Mixture of elements
B) Fixed composition.
What is an example of a heterogeneous mixture?
Salad.
True or False: All elements are considered pure substances.
True.
Fill in the blank: A ________ is a physical blend of two or more components.
mixture.
What type of mixture is air classified as?
Homogeneous mixture.
Short Answer: How can mixtures be separated?
By physical means such as filtration, distillation, or centrifugation.
Multiple Choice: Which of the following is NOT a pure substance? A) Gold B) Saltwater C) Oxygen
B) Saltwater.
True or False: A solution is another term for a homogeneous mixture.
True.
What is the difference between a compound and a mixture?
A compound is a substance formed from two or more elements chemically bonded, while a mixture is a physical combination of substances.
Fill in the blank: The components of a ________ mixture can be easily distinguished.
heterogeneous.
Short Answer: What is an example of a compound?
Sodium chloride (NaCl).
Multiple Choice: Which of the following is a characteristic of mixtures? A) Fixed boiling point B) Variable composition C) Uniform composition
B) Variable composition.
True or False: All mixtures can be separated by chemical means.
False.
What is the simplest form of matter that retains its properties?
An element.
