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
Which of the following is a heterogeneous mixture?
A) Salt water
B) Air
C) Oil and water
D) Vinegar
oil and water
Which substance will heat up the fastest if 100 J of energy is added to 10 g?
A) Water (4.18 J/g∙°C)
B) Ethanol (2.44 J/g∙°C)
C) Copper (0.385 J/g∙°C)
D) Glass (0.84 J/g∙°C)
C) Copper (0.385 J/g∙°C)
Solve for x: x/3 + 4 = 7
9
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 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).
The specific heat capacity of water is 4.18 J/g∙°C. How many J are required to raise 10.0 g of water from 20.0 °C to 25.0 °C?
209 J
What is 3,600 in scientific notation?
3.6 × 10³
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 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
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?
0.175 J / g °C
What is 8.2 x 10-2 in standard notation
0.082
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
How many grams of ice at 0 °C can be melted if 1.50 × 10³ J of heat is absorbed? (hint: you need the heat of fusion)
4.49 g
Convert 310 K to degrees Celsius.
37 °C
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
A granola bar contains 8 g of fat, 22 g of carbohydrate, and 4 g of protein.
What is the total energy in nutritional Calories (Cal)?
(Fat = 9 kcal/g; Carbohydrate = 4 kcal/g; Protein = 4 kcal/g)
176 Cal
Convert 98.6 °F to Celsius.
37 °C