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Balancing Chemical Equations Phet Key

This worksheet guides students through a chemistry simulation on balancing chemical equations. It includes questions on molecule and atom counts, reaction types, and helps develop understanding of conservation of mass through interactive exploration.

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    Name: Hr: BALANCING CHEMICAL EQUATIONS Load the simulation Balancing Chemical Equations http://phet.co lorado.ed u /e n /sim ul a tion/ bal ancing-che mi cal-eq ua tions 1. Explore the Balancing Chemical Equations simulation. a) What are rhe different ways that the simulation indicates when an equation is balanced? The arrows turn yellow and a yellow smiley face pops out of nowhere You can also choose a balance and it shows how its balanced There is also a graph where you can see it For each balanced reaction, indicate the total number of molecules in tire table below, it shows a balance above for each element as well as a bar graph Reaction Total Number of Molecules Reactant Side (Left) Product Side (Right) Make Ammonia 4 2 Separate Water 2 3 Combust Methane 3 3 3. Is the number of total molecules on the left side of a balanced equation always equal to the number of total molecules on the right side of the equation? Explain your answer. No, the molecules don't always equal since the atoms combine in different ways to make the molecules. 4. For each balanced reaction, indicate the total number of atoms in the table below. Reaction Total Number of Atoms

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    ■ Reactant ' 1 Product Side (Right) (Left) Make Ammonia 8 8 Separate Water 6 6 Combust Methane 9 9 5. Is the number of total atoms on the left side of a balanced equation always equal to die number of total atoms on the right side of the equation? Yes 6. What is the same on the left and right side of a balanced equation? Explain your answer. The number of atoms of each element. To show that we did not create or destroy any atoms we must always have the same number of atoms of each element on both sides. 7. Play level 1 of the balancing equation game. 8. Start level 2 of the balancing equation game. 9. in the simulation, were you able to use non-integer num be rs (like Vz o r 0.43) for the coefficients in a balanced equation? Why do you think tills is? No, you can't change have a part of a molecule, you can only have whole molecules. a) Which of the following are coefficients you could use in a balanced equation? W V* X I X 2 X 6 X 9 b) If you were balancing an equation containing the Ch molecule, which of the following would be correct representations of Ch and its coefficient? ] /z(JL X Ch X 30, X 6 0 , 3 0 50. 10. What do you have to do to the coefficients of equation I below to get to equation II? You divide them by 2 2 SnOa + 4 IL - 2 Sn + 4LL0 i.

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