Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
18 Cards in this Set
- Front
- Back
|
a substance made of two or more elements that are chemically bound together in a set ratio
|
compound
|
|
|
consists of two or more substances in the same place that are not chemically combined
|
mixture
|
|
|
alters the form or appearance of a material but does not convert the material into new substances
|
physical change
|
|
|
a change in matter that forms one or more new substances
|
chemical change
|
|
|
a material that can be pounded into shapes
|
malleable
|
|
|
a substance that cannot be broken down into any other substances by chemical or physical means
|
element
|
|
|
a short simple way to describe a chemical reaction, using symbols and formulas instead of words
|
chemical equation
|
|
|
what are the parts of a chemical equation
|
reactants: the substances you start with in a chemical reaction
products: the substances you end with |
|
|
the force that holds 2 atoms together
|
chemical bond
|
|
|
a combination of 2 or more atoms that are bonded together
|
molecules
|
|
|
the number of protons in the nucleus of an element's atoms. it identifies an element
|
atomic number
|
|
|
an element in group 2 of the periodic table. not as reactive as the metals in Group 1, these elements are more reactive than most metals. never found uncombined in nature. ex. magnesium & calcium
|
alkaline earth metals
|
|
|
the elements found in group 3 through 12
|
transition metals
|
|
|
have some characteristics of metals and some of nonmetals
|
metalloids
|
|
|
what did Mendeleev discover about similar elements by studying chemical and physical properties
|
that he could arrange elements in a chart, or table, based on their physical and chemical properties
|
|
|
what did Mendeleev predict about unknown elements based on the position of the blanks he left
|
he predicted the properties of the unknown elements, based on where the blanks fell in the table
|
|
|
Ex. of physical properties
|
density, color, hardness, melting point, boiling point
|
|
|
Ex. of chemical properties
|
burns, tarnishes, rusts
|
