QUESTION 1

1. If a measured quantity is written correctly, which digits are certain?

   All the digits are certain

   All but the last two digits

   The first digit only

   All but the very last digit

 

QUESTION 2

1. The balance that is located in the Chemistry Lab measures the mass in:

   Milliliters

   Liters

   Grams

   Kilograms

 

QUESTION 3

1. 42 oC =

   300.15 K

   315.15 K

   273.15 K

   231.15 K

 

QUESTION 4

1. 53.5 mL equals:

   0.535 L

   0.0535 L

   5350 L

   0.00535 L

 

QUESTION 5

1. If a measured quantity is written correctly, which digits are uncertain?

   None of the digits are uncertain

   The last digit only

   The last two digits

   All the digits except for the first one

 

QUESTION 6

1. 21.5 oC =

   726.7 oF

   294.65 oF

   38.7 oF

   70.7 oF

 

QUESTION 7

1. Beakers do not give an accurate reading of volumes.

   True

   False

1 points saved QUESTION 1 Magnesium chloride (MgCl2 dissolves completely in water. What is the molarity of the Mg2+faq) cation in a o.00500 M Mgcl2faq) solution? (3 significant digits, units M0 QUESTION 2 1 points The parts per million (ppm unit can be expressed as mg solute per liter solution (mg/L for dilute aqueous solutions. Convert the Mg2+(aa) concentration from Question 1 into units of ppm. Use the molar mass of the ion in the conversion (3 significant digits, units ppm) 0.0 ppm 1 points saved QUESTION 3 What is the molarity of CI (aq) anion in a 0.00500 M MgCl2(aq) solution (the same solution as Question 1)? (3 significant digits, units M) 00100 M QUESTION 4 1 points Convert the Cl (aq) concentration from Question 3 into units of ppm. Use the molar mass of the ion in the conversion. (3 significant digits, units pp 350 ppm QUESTION 5 1 points What is the by mass of g2+(aq) in the o 00500 M MgCI2(aq) M solution from Question 1? Assume the solution density is 1.0 g/mL, like water. (3 significant digits, unit QUESTION 6 1 points Save Answer what is the molality of the Mg2+faq) in the o.00500 M Mgcl2faq)

The rate of a certain reaction is given by the following rate law: rate-k NH Use this information to answer the questions below. What is the reaction order in N2? x10 What is the reaction order in H2? What is overall reaction order? At a certain concentration of N2 and H2, the initial rate of reaction is 49.0 M s. What would the initial rate of the reaction be if the concentration of N2 were doubled? Round your answer to 3 significant digits. The rate of the reaction is measured to be 7.0 x 104 MIS when [N2] = 0.30 M and [H2] = 1.4 M. Calculate the value of the rate constant. Round your answer to 2 significant digits. k- M

The rate of a certain reaction is given by the following rate law: rate H2NH] Use this information to answer the questions below. What is the reaction order in H2? x10 What is the reaction order in NH3? What is overall reaction order? At a certain concentration of H2 and NH3, the initial rate of reaction is 51.0 M/ s. What would the initial rate of the reaction be if the concentration of H2 were halved? Round your answer to 3 significant digits. The rate of the reaction is measured to be 5.0 x 105 M/s when [H2] = 1.8 M and [NH3] = 0.29 M. Calculate the value of the rate constant. Round your answer to 2 significant digits.