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Physical Science

Study Guide; Chapter 19

QuestionAnswer
What happens during a chemical reaction? A new material is formed by the rearrangement of atoms.
What is used to represent a chemical reaction? A chemical equation.
Materials about to react are called and are located Materials about to react are called reactants and are located to the left of an arrow.
Newly formed materials are called what? They are located where? They are called products and they are located after the arrow in a chemical equation.
List the 4 phases represent in a chemical equation and give their symbol (s) solid; (g) gas; (l) liquid; (ag) aqueous
Materials dissolved in water are designated for what? (aq) aqueous
The numbers placed in front of a chemical equation are called what? Their purpose is what? Coefficients and they show ratio.
State the Principle of Conservation of Mass Matter is neither created nor destroyed during a chemical reaction.
Are atoms gained or lost during a chemical reaction? Neither gained nor lost, they just switch partnert to form new molecules.
What is meant by saying a chemical equation must be balanced? Each atom in it must appear on both sides of the arrow the same number of times.
A coefficient tells us the number of times a ________ must be _______. chemical ; counted
How many H atoms are in 2H2O? How many O atoms? 4 ; 1
Equations can be balanced by changing what? To produce correct what? Coefficients ; Proportions
Why is it important not to change subscripts? (subscripts are the numbers that appear lower than and after Because it changes the chemical's idenity.
Balance the equaqtion: ___Fe (s) + ___O2 (9) ——^ ___F62O2 (s) ___Fe (s) + ___O2 (9) ——^ ___F62O2 (s)
Balance the equation: __H2(g) + __N2(g) ——+» __NH3(g) __H2(g) + __N2(g) ——+» __NH3(g)
Balance the equation: _Cl2 (g) + __KBr (aq) —>- _____Br2 (I) + ___KCI (aq) _Cl2 (g) + __KBr (aq) —>- _____Br2 (I) + ___KCI (aq)
Created by: jeni25
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