Atomic Structure and electron configuration
How many electrons can completely fill the 3d subshell?
10
Which of the following elements is an alkaline earth metal?
A) Na
B) Ca
C) Al
D) N
Ca
Identify which are examples of a pure substance. Select all that apply.
A) Saltwater
B) Copper wire
C) Oxygen gas
D) Soil
B) Copper wire
C) Oxygen gas
Solve for x: x/3 + 4 = 7
9
Which state of matter takes the shape of its container but has a definite volume?
liquid
Which orbital does the first electron of sodium occupy?
1s
What element is found in period 3, group 5A (15)?
P
Which of the following is a heterogeneous mixture?
A) Salt water
B) Air
C) Oil and water
D) Vinegar
oil and water
What is 3,600 in scientific notation?
3.6 × 10³
Which state of matter has particles that move very fast?
gas
Which element has the electron configuration [Ne]3s²3p⁵?
Cl
What is the correct number of protons, neutrons, and electrons, in a neutral atom of Cu with an atomic mass of 64?
29 p, 35 n, 29 e
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 8.2 x 10-2 in standard notation
0.082
Which of the following is NOT a physical property?
A) Density
B) Melting point
C) Flammability
D) Color
C) Flammability
How many unpaired electrons are in an oxygen atom (ground state)?
2
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
A brass sample has the following composition:
Copper 70.0 %
Zinc 30.0 %
If the sample has a mass of 15.0 g, what is the mass of zinc in the sample?
4.50 g
A laptop weighs 16 kg. If 30% of the weight is removed, how heavy is the laptop now?
11.2 kg
Which of the following is a chemical change?
A) crushing a soda can
B) freezing water
C) rusting iron
D) tearing paper
E) melting wax
C) rusting iron
What is the number of valence electrons for an element that has the electron configuration
[Ar]4s2 3d10 4p2?
4
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
Magnesium has three isotopes:
Mg-24: 23.99 amu, 78.7%
Mg-25: 24.99 amu, 10.1%
Mg-26: 25.98 amu, 11.2%
What is the average atomic mass of magnesium?
24.31 amu
Based on the following equations, solve for x and y.
3x+8=y+1
y=4x−5
x= 12
y= 43
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
C) 3 only