Decomposition and Synthesis Reactions

Answer to 614717
4.4 chem help
Question 1 (Essay)
Write the complete balanced equation for the reaction between barium metal (Ba) and nitrogen gas (N2). You do not need to make the subscripts smaller; just write them out as regular numbers. For example: N2.
3 Ba(s) + N2(g) = Ba3N2(s) Barium nitride
Question 2 (Multiple Choice)
Which of the following is a product formed when NaCl decomposes?
Na2
Cl
NaC
Cl2
The correct answer is Cl2 (fourth option). Third one is a carbide, nascent chlorine does not form (second option) and sodium is not diatomic (first option).
Question 3 (Multiple Choice)
What do all decomposition reactions have in common?
They all produce water (H2O) as one of the products.
They all produce individual elements as the final products.
They start with more active reactants and end with less active products.
They start with one reactant and end with more than one product.
In decomposition reaction, a compound is broken down into two or more simpler products. So the last option is correct.
Question 4 (Multiple Choice)
Which of the following combinations of reactants will result in a synthesis reaction?
Cl2 + HBr
Ca + H2O
MgO + H2O
C2H2 + O2
MgO + H2O = Mg(OH)2
Question 5 (Multiple Choice)
Which of the following is a synthesis reaction?
2H2O yields 2 H2 + O2
H2 + Cl2 yields 2 HCl
2Li + CaO yields Li2O + Ca
CH4 + 2 O2 yields CO2 + 2 H2O
H2 + Cl2 = 2 HCl
Question 6 (Multiple Choice)
Which of the following is a product formed when K reacts with Cl2?
KCl
K2Cl
KCl2
K2
2K+Cl2=2KCl , so the first option
Question 7 (Multiple Choice)
Which of the following compounds will produce H2O as one of the products when it decomposes?
Cu(OH) 2
Hg(ClO3)2
MgCO3
CaO
Cu(OH)2 = CuO2 + H2O , so the answer is the first one.
The second option will give mercuric oxide (HgO) in chloric acid (HClO3). Third option does not give water: MgCO3 = MgO + CO2 (g). And CaO does not decompose.
Question 8 (Essay)
Write the complete balanced equation for the decomposition of Al(ClO3)3. You do not need to make your subscripts smaller; just write them out as regular numbers. For example: Al(ClO3)3.
2 Al(ClO3)3 = 2 AlCl3 + 9 O2
Once you know the products, just apply the principle of balancing an equation which I hope you know!

1) Write the complete balanced equation for the decomposition of Al(ClO3)3. You do not need to make your subscripts smaller; just write them out as regular numbers. For example: Al(ClO3)3.

Chlorates decompose to form O2 and a chloride:
2 Al(ClO3)3 = 2 AlCl3 + 9 O2

2) Write the complete balanced equation for the reaction between aluminum metal (Al) and oxygen gas (O2). You do not need to make the subscripts smaller; just write them out as regular numbers. For example: O2.

It is apparent that an oxide will be formed. To write the correct formula of the oxide, you need to know the valency of Al and O, which are 3 and 2 respectively. And finally you have to balance the equation. So the answer is:
4Al + 3O2 = 2Al2O3

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