a shorter easier way to show chemical reactions, using symbols instead of words.
ions that are made of more than one atom.
the amount of one material in a given amount of another material.
A reaction that absorbs energy
When electrons are shared equally then a covalent bond is ________.
The cells in our bodies are equipped with _______ which are biological catalysts.
matter is not created or destroyed.
the attraction between two oppositely charged ions.
The minimum amount of energy needed to start a chemical reaction is called the ________.
are numbers place in front of a chemical formula in an equation.
a material that increases the rate of a reaction by lowering the activation energy.
Down
Ions in ionic compounds form an orderly, three-dimensional arrangement called a ________.
A reaction that releases energy
________ consist of molecules having covalently bonded atoms.
the materials that you have at the end of a reaction.
the process of breaking more complex molecules into its simpler parts.
when one element replaces another in a compound, or when two elements in different
compounds trade places.
a bond formed when two atoms share electrons.
A material used to decrease the rate of a reaction is called an ________.
2 pairs of electrons are shared between the oxygen atoms – this is a __________.
show the ratio of the atoms of different elements in a formula.
We say a covalent bond is ______
when electrons are shared unequally.
the solid that forms from a solution during a chemical reaction.
when two or more substances (elements or compounds) combine to make a more complex
substance.
the materials you have at the beginning of a reaction.
an atom or group of atoms that has become electrically charged.
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It prints on two pages.
Big puzzles won’t always print on one page — the clues and grid are the smallest we could make them while keeping them readable for everyone.
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