Matter composition Flashcards
(27 cards)
What is matter?
Matter is anything that has mass and occupies space.
What are the three main classifications of matter based on composition?
Elements, compounds, and mixtures.
True or False: An element can be broken down into simpler substances.
False.
What defines an element?
An element is a pure substance that cannot be broken down into simpler substances by chemical means.
Give an example of an element.
Oxygen (O).
What is a compound?
A compound is a substance formed when two or more elements chemically bond together.
True or False: Compounds can be separated into their elements by physical means.
False.
What is the chemical formula for water?
H2O.
Fill in the blank: A mixture is a combination of two or more substances that are ______ combined.
Physically.
What is a homogeneous mixture?
A homogeneous mixture has a uniform composition throughout.
Give an example of a heterogeneous mixture.
Salad.
True or False: In a homogeneous mixture, the individual components can be easily distinguished.
False.
What is the difference between an element and a compound?
An element is a pure substance made of one type of atom, while a compound is made of two or more different elements chemically bonded.
What is the process called to separate a mixture into its components?
Separation techniques.
Which of the following is a characteristic of compounds? A) Variable composition B) Fixed composition C) Physical separation
B) Fixed composition.
Fill in the blank: Elements are represented by ______ in the periodic table.
Symbols.
What is an example of a chemical reaction that forms a compound?
The reaction of hydrogen and oxygen to form water.
What type of mixture is air considered?
Homogeneous mixture.
True or False: Mixtures can have variable compositions.
True.
What is the term for the simplest form of a substance that retains its properties?
Element.
Which of the following is a compound: A) NaCl B) O2 C) Fe
A) NaCl.
What is a key characteristic of a heterogeneous mixture?
The components can be seen and separated physically.
Fill in the blank: A ______ is a substance that can be broken down into simpler substances by chemical means.
Compound.
What is the main difference between a pure substance and a mixture?
A pure substance has a constant composition, while a mixture can vary in composition.
