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30 Cards in this Set

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  • Back
"Groups" or "families" of elements are found in the periodic table in
columns
If an atom of an elelment has 12 protons, how many electrons does it have?
6 electrons
An example of a compound is
salt
Oxygen and iron can combine to form
air
If John described the melting point of water , he described a
physical property
When a piece of paper is folded, the prperty that has been changed is its
shape
Changing stat is an example of a
physical change
An ice cube is what state of matter?
solid
What something acts like, how the atoms of two or more substances react with one another, and what happens when a substance changes what is this describing?
chemical property
In the expression H2O the "2" represents
2 atoms of hydrogen
Matter has mass and takes up
space
The smallest unit of a compound is a
molecule
A combination of iron fillings and powdered sulfur is a
mixture
A mixture in which the basic parts of substances are spread evenly through wnother substance is a
solution
A property of wood is that it can burn in
oxygen
Rust results when exygen combines with
iron
Describe the particles in the nucleus of an atoma dn their electrical charge.
The nucleus contains particles with positive electrical charges called protons. It also contains particles with no electrical charges called neutrons.
Explain how the knowledge of chemical reactions can distinguish between real gold and fool's gold.
If you put fool's gold into nitric acid, it will produce a chemical reaction and give off hydrogen sufide gas. Real gold won't react with nitric acid.
The number of elelments are
just over 100
The particle in the atom that is found outside the nucleus is the
electron
When tow or more atoms join together, they form a
molecule
Sodium and chlorine can combine to form
salt
Lemonade is an example of
solution
The physical property that describes how much a substance will stretch or bend is
elasticity
Ash is a new substance formed when
wood is burned
knowing about chemical properties can help in identifying
elements and compounds
A chart that classifies elements by their properties is a
periodic table
When the atoms of different elements combine to make a new substance the substance is called a
compound
A puddle of water is what state of matter?
liquid
A substance that can be combined with baking soda to produce carbon dioxide is
vinegar