Chemical Reactions

Question 1

What’s a chemical reaction

Answer 1

a chemical change where one or more substances are destroyed and one or more new substances are created

Question 2

What’s a synthesis reaction

Answer 2

2 or more reactants combine to form a complex substance/product

Question 3

What are the different types of synthesis?

Answer 3

1) two elements form a binary compound (ex. Na + Cl –> NaCl)
2) two non-metals form a molecular compound (ex. C + O2 –> CO2)
3) non-metal oxide and water form an oxyacid (CO2 + H2O –> H2CO3)
4) metal oxide and water form a base (Na2O + H2O –> NaOH)

Question 4

What’s a decomposition reaction

Answer 4

the compound (product) breaks down into its elements or substances (the reactants)

Question 5

What are the different types of decomposition reactions

Answer 5

1) binary compounds break down into their elements (NaCl –> Na + Cl2)
2) metal nitrate breaks down (–>) into the metal nitrite and oxygen gas (ex. NaN03 –> NaNO2 + O2)
3) metal carbonate breaks down into the metal oxide and carbon dioxide (ex CaCO3 –> CaO + CO2)
4) metal hydroxide breaks down into the metal oxide and water (ex. NAOH –> Na2O + H20)

Question 6

What’s a combustion reaction

Answer 6

reaction that involves oxygen gas as a reactant and a hydrocarbon (CxHy)

Question 7

What’s complete combustion and what does it produce?

Answer 7

complete combustion is where there is abundant/excess oxygen gas
~ only produces water (H20) and carbon dioxide (CO2)

Question 8

What’s incomplete combustion and what does it produce?

Answer 8

incomplete combustion is where there is limited oxygen gas
~ produces water (H20), carbon dioxide (CO2), carbon monoxide (CO) and carbon (C)
* this carbon can be soot

Question 9

In what order do you have to balance a combustion reaction?

Answer 9

balance carbon first, balance hydrogen second, balance oxygen third