Chemical Reactions Review

Balance- C2H6 + O2 —> CO2 + H2O

2C2H6 + 7O2 —> 4CO2 + 6H2O

Balance this equation: FeCl3 + MgO ---> Fe2O3 + MgCl2

2FeCl3 + 3MgO ---> Fe2O3 + 3MgCl2

Balance- H2 + O2 —> H2O

2H2 + O2 —> 2H2O

Balance this equation: Li + H3PO4 ---> H2 + Li3PO4

6Li + 2H3PO4 ---> 3H2 + 2Li3PO4

Balance- CO2 + S8 ---> CS2 + SO2

8CO2 + 3S8 ---> 8CS2 + 8SO2

How is K2O+H2O⇾2KOH an example of synthesis A) tt reacts to form one product B) it forms fire C) tne reactive element replaces another The metals of both reactants switch places

A)

On an element reactivity list, if the uncombined element is higher on the list, the Reaction will occur. True or False? A) True B) False

A)

What statement about Chemical Reactions is NOT true? a) A chemical reaction is a process in which no new substances are produced. b) It occurs when bonds between the outermost parts of atoms are formed or broken. c) Involve changes in matter, making new materials.

A)

Decide what combustion reactions release energy as. A) Sound and motion B) Heat and radiation C) Heat and light D) Light and sound

B)

In a decomposition reaction: A) the reactants are generally two ionic compounds in aqueous solution B) energy in the form of heat or light is often produced C) the reactants are usually a metal and a nonmetal D) one of the reactants is often water

B)

In the following chemical reaction, what product is represented by X? AlCl3 + NaOH → X + NaCl A) Al3OH B) Al(OH)3 C) AlOH D) It cannot be determined.

B)

What are the two products of Combustion? A) carbon and hydrogen peroxide B) carbon dioxide and water C) sulfur and water

B)

List how many reactions there are and their names A) 4-Synthesis, combustion, double replacement, single replacement B) 4- Synthesis, decomposition, double replacement, single replacement C) 5- Synthesis, decomposition, double replacement, single replacement, combustion, balancing D) 6- Synthesis, decomposition, double replacement, single replacement, balancing, combustion

C)

Of the reactions below, which one is a double-replacement reaction? A) 2 N2 + 3 H2 → 2 NH3 B) NH4Cl → NH3 + HCl C) Cd(NO3)2 + Na2S → CdS + 2 NaNO3 D) 2 Mg + O2 → 2 MgO

C)

What is the correct definition of a Synthesis Reaction? A)a reaction in which a compound splits up into two or more simpler substances. B) a reaction in which the metals of both reactants switch places. C) two simple substances form a more complex one.

C)

What symbol represents an aqueous solution? a) (s) b) (g) c) (aq)

C)

Which of the following are decomposition reactions? 1. CH4 (g) + O2 (g) → CO2 (g) + H2O (l) 2. CaO (s) + CO2 (g) → CaCO3 (s) 3. Mg (s) + O2 (g) → MgO (s) 4. PbCO3 (s) → PbO (s) + CO2 (g) A) 2 and 3 B) 2,3, and 4 C) 4 only D) All of the above

C)

which one most correctly represents a combustion reaction? A) 2 N2 + 3 H2 → 2 NH3 B) CaO + H2O → Ca(OH)2 C) CH4 + 4 O2 → 2 CO2 + 4 H2O D) 2 Mg + O2 → 2 MgO

C)

Cr + Fe(NO3)2 → Fe + Cr(NO3)3, is an example of which type of reaction? A) Double Replacement B) Decomposition C) Combustion D) Single Replacment

D)

Synthesis reactions always: A) use only one reactant B) involve an element and an ionic compound C) require oxygen gas D) form only one product

D)

The chemical equation, KClO3 → KCl + O2, is an example of which type of reaction? A) combustion B) single-replacement C) double-replacement D) decomposition

D)

What reaction type is this: Ca(C2H3O2)2 + Na2CO3 --> CaCO3 + 2 NaC2H3O2 A) Synthesis reaction B) Decomposition reaction C) Single replacement reaction D)Double replacement reaction

D)

Write the correct formula for Sodium Chloride

NaCl

Give three pieces of evidence for chemical reactions.

Precipitate Gas Temperature