Matter Flashcards
(28 cards)
What is matter?
Anything that has mass and takes up space.
True or False: Matter can exist in solid, liquid, and gas states.
True
What is an atom?
The basic unit of matter.
Fill in the blank: Atoms are made up of protons, neutrons, and ____.
electrons
What is the atomic number of an element?
The number of protons in the nucleus of an atom.
What is a molecule?
A group of atoms bonded together.
What is the difference between an element and a compound?
An element is made of only one type of atom, while a compound is made of two or more different types of atoms bonded together.
True or False: A mixture is a combination of two or more pure substances.
True
What is a physical change?
A change in the form of matter without changing its chemical composition.
What is a chemical change?
A change that results in the formation of new substances with new properties.
Fill in the blank: The law of conservation of ____ states that matter cannot be created or destroyed in a chemical reaction.
mass
What is density?
The mass of a substance per unit volume.
True or False: Density is a physical property of matter.
True
What is a physical property of matter?
A characteristic that can be observed or measured without changing the identity of the substance.
What is a chemical property of matter?
A characteristic that describes the ability of a substance to undergo a chemical change.
Fill in the blank: The ____ of matter refers to its resistance to change in motion.
inertia
What is the law of definite proportions?
A compound always contains the same elements in certain definite proportions by mass.
What is the law of multiple proportions?
When two elements form more than one compound, the ratios of the masses of the second element that combine with a fixed mass of the first element can be reduced to small whole numbers.
True or False: Matter can be classified as pure substances or mixtures.
True
What is an example of a pure substance?
Element or compound
What is an example of a mixture?
Saltwater
What is the difference between a homogeneous and a heterogeneous mixture?
A homogeneous mixture has uniform composition throughout, while a heterogeneous mixture does not.
What is a solution?
A homogeneous mixture of two or more substances.
What is a suspension?
A heterogeneous mixture in which particles settle out upon standing.
