Electric!
Which of the following gives the correct numbers of protons, neutrons, and electrons, respectively, in a neutral atom of Cu with an atomic 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⁻
C) 29 p, 35 n, 29 e⁻
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
3 only
What is 8,570,000,000,000 in scientific notation?
8.57 * 10^12
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
A) Na > Mg > Si > P > Ar
Au^197 has a mass of 197 amu and is 70% abundance of Au average atomic mass. Au^198 has a mass of 198 amu and is 30% abundance of Au. What is the average atomic mass?
197.3 amu
The maximum number of electrons that may occupy the fourth energy level is
A) 8
B) 10
C) 18
D) 32
E) 2
D) 32
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.
E (Gasoline is actually a homogeneous mixture).
What is 0.0000290 in scientific notation?
2.90 * 10^-5
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
B) Kr > Br > Se > Ge > Ga
Carbon^13 is an isotope of Carbon. How many protons, neutrons, and electrons does C^13 have?
protons: 6
neutrons: 7
electrons: 6
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
C) 4
Which of the following is an example of a physical change?
1) Rusting iron
2) Burning wood
3) Baking bread
4) Melting ice
4) melting ice
What is 8.5 * 10^3 in standard notation?
8500
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
D) F > O > N > C > B
Mn has two isotopes: Mn^55 at 51% abundance and Mn^56 at 49% abundance. What is the average atomic mass of Mn?
55.49 amu.