Chemical Reactions
A substance that enters into a chemical reaction is called what?
A substance that enters into a Chemical reaction is called an reactant.
The number of moles of water present in 90 grams of water is what?
5
The amount of solute in a given solution is called the what?
concentration of a solution
Which represents a bronsted acid-base reaction?3O2(g)⇌2O3(g)
OH−+H3O+⇌2H2O
OH−+H3O+⇌2H2O
Generally solvent is present in major proportion compared to the
Solute
To balance a chemical equation, it is necessary to adjust what?
The coefficients
What is the mass in grams of 3 moles of nitrogen gas?
84g
A homogeneous mixture of two or more components in which the particle size is smaller than 1 nm is called a
solution
Process in which acids (H+) and bases (OH−) react to form salts and water is called
neutralization
Why are acids called proton donors?
Acids have the tendency to lose H+ atoms, which are also referred to as protons because of their positive charge.
What kind of reaction does one element replace a similar element in a compound?
a displacement reaction.
Calculate the number of moles of helium present in 52g of Helium
13
The molar mass of an element is equal to what?
Relative atomic mass
Identify the conjugate acids and bases in the equation
NH3+H2O--->NH+4+OH-
(H2O,OH−)and(NH4+,NH3)
What is the molarity of the mixture of two solution, first solution 4 M and 10 liter and second solution 2 M and 40 liter?
2.4g
List the different types of chemical reactions and give a brief description
Synthesis, decomposition, single displacement, and double displacement.
What is the amount of H2SO4 (in grams) present in 0.2 moles of sulphuric acid?
19.6g
25 mL of a solution of barium hydroxide on titration with 0.1 molar solution of hydrochloric acid gave a value of 35 mL. The molarity of barium hydroxide solution was
0.07
In the reaction,HCO3−+H2O→OH−+H2CO3, the conjugate acid - base pair is
H2CO3,HCO3−
The number of molecules of CO2 present in 44g of CO2 is
6.0×10^23
Which equation is not balanced
H2+H2+O2--->H2O+H2O
2H2+O2--->H2O
2H2+O2--->H2O
A number of moles of hydrogen atoms required to get one mole of hydrazobenzene (C12H12N2) from nitrobenzene (C₆H₅NO₂) are what?
10
Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 mL of 1.5 M first solution + 520 mL of 1.2 M second solution. What is the molarity of the final mixture?
1.344 M
The ionisation constant of an acid - base indicator (a weak acid) is 1.0×10−6. The ionised form of the indicator is red, where as the unionised form is blue. The pH change required to alter the colour of the indicator from 80% blue to 80% red is
1.20
A bimolecular reaction is the one in which
Two reactant molecules produce product(s)