chem

WHat is the correct balanced hydration equation for (NH4)2CO3?

(NH4)2CO3(s)-----> 2Nh4+(aq)+CO32-(aq)

What is the molarity of a solution prepared by dissolving 5.00g of MgCl2 in water to give a total volume of 500 mL?(Atomic mass of Mg: 24.31; Cl: 35.45)

0.105M

A Ringer's solution for intravenous fluid replacement has a concentration of 155 mEq Cl per liter of solution. If a patient receives 1250 mL of Ringer's solution, how many equivalents of Cl were given?

0.194

What is the concentration in ppb of a water sample that contains 28 ug of lead in 44 L?

0.64 ppb

What is the concentration in parts per million (ppm)of a solution that contains 15 mg lead in 1250 mL of solution?

12 ppm

Consider the following system at equilibrium: N2(g)+3H2(g)<---> 2NH3(g)+ 92.94 kJ Which of the following changes will shift the equilibrium to the right? 1 Increasing temperature 2 decreasing temperature 3 removing some NH3 4 adding some NH3 5removing some N2 6 adding some N2

2,3,6

How much water must be added when 125 ml of a 2.00M solution of HCl is diluted to a final concentration of 0.400 M?

500L

What is the percent mass/volume (%m/v) of a solution that is made from putting 25.0 g of NaCl in water to make 275 mL of a solution?

9.09%m/v

Which of the following is correct balanced equation for the neutralization reaction that occurs between AL(OH)3 and HCl (aq)?

Al(OH)3+3HCl(aq)----->AlCl3+3H2O

Which of the following compounds will be most soluble in water?

CH3OH

Which of the following cannot act as a Bronsted-Lowry acid?

CO32−

In the following equation which is the proton donor and which is the proton acceptor? CO32-(aq)+H2O(l)----->Hco3-(aq) +OH-(aq)

Donor:H2O; Acceptor : CO32-

Which of the following does not represent a conjugate acid-base pair?

HC2H3O2/OH-

Which of the following is the strongest weak acid?

HF (Ka=6.5 x 10-4)

Which of the following is a typical chemical equation that represents a hydration reaction?

K2CO3(s)----->2k+(aq)+CO32-(aq)

You have been given an unknown liquid that is soluble in water but not in benzene (a nonpolar solvent). Which type of intermolecular forces does this unknown have?

Polar

Given the following reaction, the equilibrium expression will be:CaCo3(s) = CO2(g)+ 2H2O(g)

[CO2]

The following reaction is exothermic. Which of the following will drive the reaction to the right (towards the prpducts)?

a decrease in temperature

Which of the following properties is not characteristic of an acid?

has slippery feel

How does add SO3 affecting the equilibrium of the reaction shown?

the equilibrium shifts to the left

In a solution, the solute is:

the substance that is dissolved

A homogenous mixture consists of 12% ethanol, 28% methanol and 60 % water. Which of these is a solvent for the mixture?

water