Electronics
Which of the following gives the correct numbers of protons, neutrons, and electrons, respectively, in a neutral atom of Cu with an automic mass of 64?
A) 29 p, 35 n, 28 e⁻
B) 35 p, 29 n, 35 e⁻
C) 29 p, 35 n, 29 e⁻
D) 64 p, 35 n, 29 e⁻
E) 29 p, 64 n, 29 e⁻
Answer: C) 29 p, 35 n, 29 e⁻
When 17.0 grams of butter is burned, it produces 122 kcal of energy. What is this energy in joules?
A) 2.93 × 10^4 J
B) 1.22 × 10^3 J
C) 3.61 × 10^4 J
D) 5.10 × 10^5 J
E) 2.06 × 10^3 J
Correct Answer: D) 5.10 × 10^5 J
Which of the following is/are a chemical change?
1. dissolving sugar in a glass of water
2. chopping an onion into small pieces
3. burning natural gas
4. freezing orange juice
A) 1 only
B) 4 only
C) 3 only
D) both 2 and 4
E) both 1 and 3
Correct Answer: C) 3 only
Which of the following correctly lists the elements in order of decreasing atomic size (i.e.,
largest to smallest size from left to right)?
A) Na > Mg > Si > P > Ar
B) Ar > P > Si > Mg > Na
C) Mg > Na > P > Si > Ar
D) Si > P > Ar > Na > Mg
E) Ar > Si > P > Na > Mg
Correct Answer: A) Na > Mg > Si > P > Ar
The maximum number of electrons that may occupy the fourth energy level is
A) 8
B) 10
C) 18
D) 32
E) 2
Answer: D) 32
To a sample of liquid water, 155 kJ of heat is added to vaporize all the liquid to vapor at 100 °C. What is the mass of the water sample?
A) 68.6 g of water
B) 0.0146 g of water
C) 350. g of water
D) 14.6 g of water
E) 0.0686 g of water
Correct Answer: A) 68.6 g of water
Which of the following statements regarding mixtures is FALSE?
A) Apple juice is an example of a homogeneous mixture.
B) Chocolate chip cookie batter is an example of a heterogeneous mixture.
C) A mixture is a combination of two or more substances in which each substance retains its own chemical identity.
D) A homogeneous mixture has a uniform composition thus its components are evenly distributed.
E) Gasoline is an example of a heterogeneous mixture.
Correct Answer: E (Gasoline is actually a homogeneous mixture).
Which of the following correctly lists the elements in order of decreasing ionization energy
(i.e. highest to lowest ionization energy from left to right)?
A) Br > Se > Ga > Kr > Ge
B) Kr > Br > Se > Ge > Ga
C) Kr > Se > Br > Ga > Ge
D) Ga > Ge > Se > Br > Kr
E) Ga > Br > Ge > Kr > Se
Correct Answer: B) Kr > Br > Se > Ge > Ga
What is the number of valence electrons for an element that has the electron configuration
[Ar]4s^2 3d^10 4p^2?
A) 2
B) 3
C) 4
D) 5
E) 6
Answer: C) 4
When 722. J of heat is applied to a 152 g sample of an unknown metal, the temperature went from 22.4 °C to 49.6 °C. What is the specific heat of the metal sample?
A) 0.850 J / g °C
B) 0.132 J /g °C
C) 0.175 J / g °C
D) 0.307 J / g °C
E) 0.367 J / g ℃
Answer: C) 0.175 J / g °C
The prescribed dosage of amoxicillin for the treatment of a moderate case of
bronchitis in an average adult is 500 mg/8 hours. If the patient is told to continue the
medication for a total of 6 days, what is the total mass, in grams, of amoxicillin taken?
90g
700g
7g
9g
Correct Answer: 9g
Which of the following correctly lists the elements in order of decreasing electronegativity from left to right?
A) C > B > O > N > F
B) B > C > N > O > F
C) O > F > N > C > B
D) F > O > N > C > B
E) F > N > O > B > C
Correct Answer: D) F > O > N > C > B
Which of the following elements has the electron configuration 1s2 2s2 2p6 3s2 3p1?
A) Na B) Si C) Al D) Mg E) Ga
Al
When 6,750 J of heat is added to a 250 g piece of aluminum, its temperature increases from 25.0 °C to 55.0 °C. What is the specific heat capacity of aluminum in this experiment?
0.900 J / g °C
An element has two isotopes. Isotope 1 has a mass of 68.9256 amu and an abundance of 60.11%. Isotope 2 has a mass of 70.9247 amu and an abundance of 39.89%. What is the average atomic mass of the element?
69.72 amu
Which of the following correctly lists the elements in order of decreasing ionization energy?
A) Ne > F > O > N > C
B) F > Ne > O > C > N
C) Ne > F > N > O > C
D) O > N > C > F > Ne
E) C > N > O > F > Ne
A
A 150 g block of copper at 95.0 °C is dropped into 300 g of water at 20.0 °C. The system reaches an equilibrium temperature of 23.0 °C. Assuming no heat is lost to the surroundings, what is the specific heat capacity of copper? (Specific heat of water = 4.184 J/g °C)
0.349 J / g °C