Chapter 1 Flashcards
(18 cards)
Matter
Anything that occupies space and has a mass
Chemistry
Chemistry focuses on composition, structure, properties and changes of matter
Sólida
• Have a definite volume and shape
• Will not take the shape of a container
• Will not completely fill a container
Liquids
• Does not have a definite volume or shape
• Can take the shape of its container
• Does not completely fill a container
Gases
• Does not have a definite volume or definite shape
• Can take the shape of a container
• Can completely fill a container
States of matter
Gas, liquid, solid
The closer atoms and molecules are to each other, the more attracted they are to each other which leads to a solid
True or false?
True
States of matter exist as a pure substance or a mixture
True or false?
True
Homogenous mixture
A single phase combination of solids, liquids, or gases with a uniform distribution of its constituents throughout the substance.
Ex: sugar & water, the sugar dissolves in the water, making it one substance
Heterogeneous mixture
A combination of solids, liquids, or gases that are not uniformly distributed throughout the substance
Ex: sand, it has a whole bunch of noticeable particles
Mixtures
Can be homogenous or heterogenous
Atom
Smallest unit of an element that can exist as a stable independent entity
Element
One of the 100 pure substances in our world from which compounds are formed.
Elements contain only 1 atom
Compound
Pure substance made of 2 or more different types of atoms in a fixed, characteristic chemical combination
Most elements are solids at room temperature
True or false?
True
Molecules
2 or more atoms held together by chemical bonds in a certain spatial agreement (nonmetal atoms)
Groups
Elements in the periodic table organized in vertical columns
Chemical Reaction
A chemical reaction is a process where one or more substances (reactants) are transformed into one or more different substances (products) by rearranging the atoms within the molecules, resulting in new chemical bonds being formed and old ones broken; essentially, the composition of the substances changes during the reaction
