CHEM FINAL

Nitrogen (N2) is an example of a(n)

A) element

How many protons and neutrons are in chlorine-37?

C) 17 protons, 20 neutrons

What is the name of HNO3?

D) nitric acid

The answer to the following addition problem using significant figures is _____________. 0.0161 + 1.24

E) 1.26

What is the mass in milligrams of an object that has a mass of 2.2 kilograms?

2.2 x 10^6 mg

The equilibrium constant gives information about the favored direction of the reaction. If the Kc for a reaction is 2.1 x 104, what is favored?

A) products

How many electrons are unpaired in the orbitals of a carbon atom?

A) 2

How many inches (to the appropriate number of significant figures) are in 7.2 miles (1 mile = 5280 ft)?

A) 460,000 inches

The numbers of protons, neutrons, and electrons in the ion 108Ag+ are respectively

A) 47, 61, 46

Copper has two naturally occurring isotopes. One has a mass number of 62.93 and has 69.09% abundance. The other has a mass number of 64.93 and has a 30.91% abundance. What is the atomic weight of this element?

A) 63.55 amu

Which of the following correctly shows 999.1496679 rounded off to four significant figures?

A) 999.1

Which of the following has an electron configuration that is the same as Argon?

A) Ca+2

Which atom has four valence electrons in the energy level n=2?

A) Carbon

What is the abbreviate electron configuration for Copper?

A) [Ar] 4s13d10

A solution has a pOH of 8.45. The solution is:

A) acidic

Which of the following is correct? A) atoms of elements are electrically neutral B) the charges on a proton and a neutron are both positive C) electrons attract one another D) the mass of an electron equals that of a neutron (1 amu)

A) atoms of elements are electrically neutral

Zirconium ignites spontaneously in air when finely divided. What type of property is this?

A) chemical

Which elements name is incorrectly matched with its symbol?

A) chlorine, C

Which is an example of a chemical change?

A) digestion of food

Hydrochloric acid can be made in the following exothermic reaction: H2 + Cl2 <--> 2 HCl _________________ will cause the equilibrium to shift _________________. Question 12 options: A) increasing the temperature, right B) increasing the temperature, left C) decreasing the temperature, left D) none of the above Save

B) increasing the temperature, left

Report the answer to the following with the correct number of significant figures: 1.00 (1.24 - 1.0161) =

B) .22

What is the electron configuration for Gallium?

B) 1s22s22p63s23p64s23d104p1

What is the [OH-] of a solution that has a pH of 6.3?

B) 2.0 x 10-8 M

You are having a party with some of your friends and you make 11.2 L of homemade root beer. How many gallons of root beer is that? (1 gallon = 4 quarts) (1 L = 1.057 qrts)

B) 2.96 gallons

413 K is equivalent to ______________ Fahrenheit?

B) 284

A newborn baby weighed in at 7 lbs 8 oz. How many grams would that be? (1 kg = 2.205 lbs) ( 1 lb = 16 oz.)

B) 3,400 grams

Acetic acid has a Ka of 1.8 x 10-5. What is the pH of a buffer solution containing 0.659 M acetic acid and 0.877 M sodium acetate?

B) 4.87

How many significant figures are in the number 0.0060210?

B) 5

What is the formula for sulfuric acid?

B) H2SO4

What is the conjugate acid of H2PO4-?

B) H3PO4

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

B) NO3-

Water is an example of

B) a compound

Given an electron configuration of 1s22s22p63s23p64s2, what is this element?

B) alkaline-earth metal

Ions are formed when atoms

B) gain or lose electrons

Group 7A elements are also called

B) halogens

Does the equilibrium for the following reaction favor the products or the reactants? H3PO4 + H2O <--> H3O+ + H2PO4-

B) reactants

What is the density of a substance having a mass of 0.510 kg and a volume of 2250 cm3?

C) 0.227 g/mL

The complete electron configuration for the ion S-2 is:

C) 1s2 2s2 2p6 3s2 3p6

What is the volume of a piece of metal with a mass of 25.4 grams if the density of that metal is 8.87 g/mL?

C) 2.86 mL

Slugs generate mucus in order to move. For every meter travelled, your pet slug generates 0.100 mL of mucus. Express the amount of mucus generated by your slug in miles per gallon. (1 mile = 1609 m) ( 1 L = 1.057 qt) (4 qt = 1 gal)

C) 23.5 miles/gal

Which pair are isotopes of each other?

C) 24Na and 23Na

The result to the following calculation has _______ significant figures? (45.2)(20.254 - 19.24)(0.004567)

C) 3

In class we made a "sugar snake". How much gas was released if we started out with 50 grams of sugar and 75 grams of sulfuric acid and the resulting "sugar snake" weighed 83 grams?

C) 42 g

Which of the following elements has the highest ionization energy? A) Al B) Si C) P D) S E) Mg

C) P

Which best describes a homogenous mixture?

C) a solution of constant composition throughout

When the salt BaCl2 is placed in water, what type of solution is formed?

C) neutral

Fluorine is a

C) nonmetal

Given the following exothermic reaction at equilibrium: 2 CO + O2 <--> 2 CO2 Which change will cause a decrease in the production of CO2? Question 13 options: A) adding CO B) using a catalyst C) increasing the volume D) decreasing the temperature

D) decreasing the temperature

For the following endothermic reaction, which of the following would increase the amount of oxygen? 2CO2 --> 2CO + O2 Question 11 options: A) decrease the volume B) increase CO concentration C) decrease temperature D) none of the above

D) none of the above

How many neutrons are found in a bismuth atom having a mass number of 215?

D) 132

The electron configuration: 1s22s22p63s23p6 is the correct electronic configuration for all the following except? A)S-2 B) Ca+2 C) Cl- D) Al+3 E) Sc+3

D) Al+3

In the following reaction: NH4+ + H2O <--> NH3 + H3O+

D) H2O is a base and H3O+ is its conjugate acid

Which of the following atoms has the smallest atomic radius? A) Li B) B C) O D) Ne

D) Ne

Which of the following alkaline-earth metals has the largest atomic radius? A) Cs B) Fr C) Ba D) Ra

D) Ra

What is the abbreviated electron configuration of bromine?

D) [Ar]4s23d104p5

Which pair includes an example of both a homogenous and a heterogeneous mixture?

D) apple juice and pizza

What is the Bronsted-Lowry definition of a base?

D) proton acceptor

Convert 7.483 x 10-3 from scientific notation.

E) 0.007483

A solution of 0.25 M NaOH is used to neutralize 25.0 mL of H3PO4 solution. If 33.0 mL of NaOH solution is required to reach the endpoint, what is the molarity of the H3PO4 solution? (Don't forget to write a balanced chemical equation)

E) 0.11 M

How many electrons can occupy energy level n=3?

E) 18

Which of the following does not describe an acidic solution? A) the hydronium ion concentration is greater than the hydroxide ion concentration B) the pH is less than 7 C) the hydronium ion concentration is greater than 1.0 x 10-7 D) a strong or weak acid is present E) all of the answers describe acidic solutions

E) all of the answers describe acidic solutions

Which combination of an acid and a base can form a buffer solution?

E.) H2CO3 / NaHCO3