SOLUTIONS
In a solution, the substance doing the dissolving and present in a larger amount is the
what is SOLVENT
Describe an acid according to the Brønsted -Lowery definition
Bases are PROTON ACCEPTORS
71) Which of the following has the correct variable and variable name based on what has been given? A) 98 J - Variable Name: Temperature - Variable Symbol: T B) 4.18J/g℃ - Variable Name: Specific Heat - Variable Symbol: c C) 9851℃ - Variable Name: Heat Energy - Variable Symbol: Q D) 58g- Variable Name: Mass - Variable Symbol: kg
B) 4.18J/g℃ - Variable Name: Specific Heat - Variable Symbol: c
If a graph starts with a potential energy of 45kJ and ends with 10 kJ the reaction is
EXOTHERMIC
If a graph starts with a potential energy of 45kJ and ends with 10 kJ. What is the enthalpy change (∆H) of the reaction?
-35kJ
What is UNIVERSAL SOLVENT
Calculate the pH of a solution of H2S that has an [H+] of 1.0 x 10-9 M
pH is 9
X(s) + Y(s) → Z(g) + heat The reaction above is a(n) ____________ reaction because _________ is being released
exothermic reaction; heat
According to the kinetic-molecular theory, gas particles, liquid particles, and particles of a solid all experience some type of motion. Describes the motion of particles in a gas
Particles can move feely without staying in contact with other particles
Octane (C8H18) is insoluble in water. Which statement best explains this phenomenon in terms of polarity?
Octane is nonpolar, and water is polar
The alloy, sterling silver, is 92.5% silver and 7.5% copper. What is the solute?
What is COPPER
A substance has the following characteristics listed below: contains a very large concentration of + ions, blue litmus paper turns red, corrosive, used in ant venom, give a number on the pH scale where this substance could fall
0-6
The enthalpy change (∆H) of a reaction can be calculated by...? (use reactants and products not final and initial)
taking the energy of the products minus the reactants
A balloon is filled with air at room temperature (300 K). The balloon is then dipped into liquid nitrogen at 50 K, and the balloon shrinks dramatically. What happens to the SPEED and VOLUME of the molecules in the balloon?
slow down, causing the volume to decrease
If an acid completely dissociates is it a strong or weak acid?
STRONG ACID
The polar structure of pure water (H2O) makes it a good
What is SOLVENT
The reading of a pH meter is a measure of___ ions
H+
How much heat energy is needed to heat 125 g of liquid water at 0 oC to 80 oC? (Specific heat of water is 4.18 J/g oC)
41,800 J
A sample of a gas is contained in a closed rigid cylinder. According to the kinetic molecular theory, what occurs to the rate of collisions between molecules when the gas inside the cylinder is cooled?
the rate of collisions between gas molecules decreases
What volume of a 9.00 M HCl solution would you need to prepare 200.0 mL of a 0.500 M HCl?
11.1mL
What is the molarity of an aqueous solution containing 0.22 moles of NaCl in 0.90 L of solution?
0.24 M
Hydrochloric acid (HCl) is an acid which will:
Form hydronium ions when dissolved in water
The temperature of a sample of water increases from 20.8oC to 64.6 oC as it absorbs 8,150 J of heat. What is the mass of the sample? (Specific heat of water is 4.18 J/g oC)
44.5 g
A 2.00 L flask contains 15.00 moles of a gas at 27.0 °(C) What is the pressure of the gas in atm?
185 atm
What volume of 1.50 M NaOH are needed to make 750. mL of a 0.600 M NaOH solution?
300 mL