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BJU Physical World 9 Word Scramble

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Science Vocab 147928

Question	Answer
binary compounds	A compound that is composed of two different elements.
chemical equations	An equation that represents the changes that take place in those compositions as the substances react.
chemical formula	A shorthand method of expressing the makeup of a compound (pure substance).
coefficients	A number placed before a formula to balance an equation.
combination reactions	Reactions that combine two or more substances into one more complex compound.
decomposition reactions	Reactions that decompose or take apart the formula units or molecules of a substance.
double-replacement reactions	In this reaction, two ionic compounds swap cations and anions with each other.
electrolysis	A decomposition reaction that decomposes the reactants by an electric current in solution.
endothermic reactions	A reaction that requires thermal energy.
exothermic reactions	A reaction that gives off thermal energy.
oxidation numbers	Symbols that indicate the number of electrons that an element gains or loses as it bonds.
polyatomic ions	A group of several atoms that act as a single charged particle.
precipitates	A solid formed during a reaction; insoluble in water.
products	A substance (on the right hand side of the equation) that is produced by a chemical change.
reactants	A substance (on the left-hand side of the equation) that undergoes a chemical change.
single-replacement reactions	In this reaction, one element in an existing compound is replaced by another element.
subscripts	A small number placed beside the symbol of an element in a formula to indicate the number of atoms of that element contained in the compound represented by that formula.