Chemical Reactions

Chemical Reactions

By llanham summitt

Multiple Choice

Molecules like CuSO4*5H2O that have a specific number of water molecules linked to them are known as ____________

• .  Chlorates

• Hydroxides

• Hydrates

• Carboxylate

   

Multiple Choice

The activity series and the solubility charts help predict products in chemical reactions.  Which one tells which elements replace the others in a chemical reaction?

• . the activity series

• the Solubility Charts

• Neither

• both

Multiple Choice

A reaction of an acid and a base that produces salt and water is known as a(n) _________________ reaction

• Haber reaction

• oxidation reduction reaction

• Dehydration reaction

• Neutralization Reaction. 

Multiple Choice

Decomposition reactions that occur in the presence of oxygen are known as _______ reactions

• double replacement reactions,

• combustion reactions

• oxidation reactions

• hydration reactions

Multiple Choice

Arrows can be used in chemical reaction to indicate _________( $$\uparrow$$   ) and __________( $$\downarrow$$   )

• liquids and gases

• precipitates and gases

• heat in and heat out

• adding materials and decanting materials

Multiple Choice

The symbol (aq) in a chemical equation means:

• Aquarena

• Silver

• Aqueous

• None of these

Multiple Choice

New substances formed at the end of a chemical reaction are Known as___________

• Reducers

• Electrolytes

• Products

• Reactants

Multiple Choice

Beginning substances of a chemical are called _________

• Reactants

• catalysts

• Products

• oxidizers

Multiple Choice

A chemical equation should:

• include all reactants and products

• include balanced formulas for reactants and products

• observe the law of conservation of mass of matter

• all of these

Multiple Choice

Endothermic reactions_______

• absorb heat

• give off heat

Multiple Choice

Exothermic reactions_______

• absorb heat

• give off heat

Multiple Choice

Which equation is a balanced chemical equation ?

• $$2NaOH\ +\ CaBr_3\ \rightarrow\ Ca\left(OH\right)n+NaBr$$  

• $$NO\ +\ Cl_2\ \rightarrow\ NOCl$$  

• $$CaCO_{3\ }\rightarrow\ CaO\ +2CO_2$$  

• $$2AlCl_3\ +\ 3Mg\ \rightarrow3MgCl_2\ \ +\ 2A1\ _{\Delta}$$  

Multiple Choice

Which equation is correctly balanced for hydrogen and oxygen reacting to form water?

• $$H_2\ +\ O_2\ \rightarrow\ H_2O$$  

• $$2H_2\ +\ O_2\ \ \rightarrow\ \ 2H_2O\$$  

• $$4H\ +\ O_2\ \ \rightarrow\ 2H_2O$$  

• $$H_2\ +\ O\ \ \rightarrow\ \ \ H_2O$$  

Multiple Choice

Which set of coefficients willm balance this chemical equation?

$$\left(\ \right)C_2H_4\left(g\right)+\left(\ \right)O_2\left(g\right)\ \ \rightarrow\ \ 2CO_2\left(g\right)+2H_2O\left(g\right)\ \$$  

• 1 , 2

• 1, 3

• 2 , 3

• 2 , 5

Multiple Choice

What type of reaction is shown below?

$$2KClO_3\ \left(s\right)\rightarrow\ \ 2KCl\ \left(s\right)\ \ +\ 3O_2\ \left(g\right)$$  

• synthesis

• combustion

• decomposition

• single replacement

Multiple Choice

Which of these is a decomposition reaction?

• $$2KClO_3\ \rightarrow\ 2KCl\ +\ 3O_2\$$  

• $$2H_2\ +\ O_2\ \rightarrow\ 2H_2O$$  

• $$Fe\ +\ CuCl_2\ \ \rightarrow\ FeCl_2\ \ +\ Cu$$  

• $$NaOH\ \ +\ HCl\ \ \rightarrow\ \ NaCl\ \ +\ HCl$$  

Multiple Choice

What type of reaction occurs when potassium iodide combines with lead II nitrate?

• combustion

• synthesis

• single replacement

• double replacement

Multiple Choice

Which equation is a balanced equation?

• 2NaOH + CaBr2=> Ca(OH)2 +NaBr

• NO + Cl2 => NOCl

• 2AlCl3 + 3Mg +3MgCl2 +2Al

• CaCO3 => 2CO2 + CaO

Multiple Choice

Hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) to produce a salt water solution. Water are the products of the reaction?

• $$NaCl\ +\ H_2O$$  

• NaOH + HCl

• HCl + NaOH

• $$NaOH\ \&\ H_2O$$  

Multiple Choice

Which equation for the complete combustion of propane is correctly balanced?

• $$C_3H_8\ +3O_2\ \rightarrow\ 2CO_2\ +4H_2$$  

• $$C_3H_8\ +7O_2\ \rightarrow\ 3CO_2\ +4H_2O$$  

• $$2C_3H_8\ +10O_2\ \rightarrow\ 6CO_2\ +8H_2O$$  

• $$C_3H_8\ +5O_2\ \rightarrow\ 3CO_2\ +4H_2O$$  

Multiple Choice

What compound is formed when the soft putty-like metal sodium (Na) reacts with the green-colored poisonous gas chlorine (Cl)?

• sugar

• table salt

• sulfuric acid

• sodium hydroxide

Multiple Choice

What is the molar mass of $$H_2CO_3?\ \ \left(atomic\ mass:\ C\ =\ 12.01\ \ H=\ 1.01\ \ \ O=\ 15.99\right)$$  

• 23.00 g/mol

• 24.00 g/mol

• 61.00 g/mol

• 62.00 g/mol

Multiple Choice

Which of the following is the balanced chemical reaction for the chemical reaction of postassium and oxygen to produce potassium oxide?

• $$K\ +\ O\ \rightarrow\ KO$$  

• $$4K\ +\ O_2\ \rightarrow\ 2K_2O$$  

• $$4P\ +3O_2\ \rightarrow\ 2P_2O_3$$  

• $$K\ +\ O_2\ \rightarrow\ KO_2$$  

Multiple Choice

Which set of coefficients will balance this chemical equation?

$$\ \left(\ \right)PbS\left(s\right)\ +\left(\ \right)O_2\left(g\right)\rightarrow\ 2PbO\left(s\right)\ +\ 2SO_2\left(g\right)$$  

• 1, 2

• 1, 3

• 2, 2

• 2, 3

Multiple Choice

How does the concept of conservation of mass apply to balancing chemical reactions?

• reactions and products have exactly the same molecules

• the change in the amount of matter is equal to the change in energy

• reactants and products have exactly the same number and kind of atoms

• the change in amount of matter is only a small percent of the total mass

Multiple Choice

Examine the activity series of metals in the table. Based on the activity series, which metal could X replace in the reaction below? $$X\left(s\right)\ +Ca\left(NO_3\right)_2\left(aq\right)\rightarrow Ca\left(s\right)\ +X\left(NO_3\right)_2\left(aq\right)$$  

• Ba

• Fe

• Mg

• Zn

Multiple Choice

What type of reaction is this? $$Mg\ \ +\ Zn\left(NO_3\right)_2\rightarrow\ \ Zn\ \ +\ Mg\left(NO_3\right)_2$$  

• decomposition

• single replacement

• synthesis

• double replacement