Auburn University

Rocks brought back from the Moon were estimated to have 8% of the ⁴⁰K (Potassium) that it initially had. (It turns into ⁴⁰Ar.) How long ago were these rocks formed? This indicates how long it has been since the Moon was hot and molten.
a. After 10,00

Physics

Radioactivity Solutions

Rocks brought back from the Moon were estimated to have 8% of the ⁴⁰K (Potassium) that it initially had. (It turns into ⁴⁰Ar.) How long ago were these rocks formed? This indicates how long it has been since the Moon was hot and molten. a. After 10,000 years, what fraction of a sample of 40K is left over? b. After 1,000 years, what fraction of a sample of 40K is left over?

Hydrochloric acid is usually purchased in a concentrated form that is 37.0% HCl by mass and has a density of 1.20 g/mL. How much concentrated solution would it take to prepare 3.05 L of 0.505 M HCl upon dilution with water?

Physical Chemistry

Solutions Solutions

Hydrochloric acid is usually purchased in a concentrated form that is 37.0% HCl by mass and has a density of 1.20 g/mL. How much concentrated solution would it take to prepare 3.05 L of 0.505 M HCl upon dilution with water?

An aqueous solution containing 18.1 g of an unknown molecular (nonelectrolyte) compound in 106.0 g of water was found to have a freezing point of -1.5 °C. Calculate the molar mass of the unknown compound. (Use Kf = 1.86 °C/m). Express your answer usi

Physical Chemistry

Solutions Solutions

An aqueous solution containing 18.1 g of an unknown molecular (nonelectrolyte) compound in 106.0 g of water was found to have a freezing point of -1.5 °C. Calculate the molar mass of the unknown compound. (Use Kf = 1.86 °C/m). Express your answer using two significant figures.

Calculate the osmotic pressure of a solution containing 23.1 g of glycerin (C3H8O₂) in 261.0 mL of solution at 290 K. Express your answer in atmospheres to three significant figures.

Physical Chemistry

Surface chemistry Solutions

Calculate the osmotic pressure of a solution containing 23.1 g of glycerin (C3H8O₂) in 261.0 mL of solution at 290 K. Express your answer in atmospheres to three significant figures.

An aqueous solution contains 5.0% hydrogen peroxide by mass. What is the molarity of this solution? (Assume a density of 1.02 g/mL.) Express your answer in moles per liter to two significant figures.

Physical Chemistry

General Solutions

An aqueous solution contains 5.0% hydrogen peroxide by mass. What is the molarity of this solution? (Assume a density of 1.02 g/mL.) Express your answer in moles per liter to two significant figures.

A rare decay mode has been observed in which ²²²Ra emits a ¹⁴C nucleus.
(A) The decay equation is ²²²Ra → AX +¹⁴C.
Identify Nuclide AX (element and number of nucleons) and explain your
answer in a sentence.

Physics

Radioactivity Solutions

A rare decay mode has been observed in which ²²²Ra emits a ¹⁴C nucleus. (A) The decay equation is ²²²Ra → AX +¹⁴C. Identify Nuclide AX (element and number of nucleons) and explain your answer in a sentence.

A group of students at a high school took a
standardized test. The number of students
who passed or failed the exam is broken
down by gender in the following table.
Determine whether gender and passing
the test are independent by filling out the
blanks in

Math

Probability Solutions

A group of students at a high school took a standardized test. The number of students who passed or failed the exam is broken down by gender in the following table. Determine whether gender and passing the test are independent by filling out the blanks in the sentence below, rounding all probabilities to the nearest thousandth. Passed Failed Male 52 37 Female 81 30 Since P(male)*P(fail) = and P(male and fail) the two results are so the events are

91
91
1
r
1/r2
F12
(uC)
(uC)
(cm)
(m)
(m)
(N)
10 C
10 uC
10 cm
0.1 m
100
89.876
10 C10 uc
9 cm
0.09 m
123.45679
110.957
10 C
10 uC
8 cm
0.08 m
156.25
140.430
10 uC
10uC
7 cm
0.07 m
204.08163
183.419
10 uC
10 uC
6 cm
0.06 m
277.77777
249.654
10 uC 10 uc
5 c

Physics

Electric Field and Potential Solutions

91 91 1 r 1/r2 F12 (uC) (uC) (cm) (m) (m) (N) 10 C 10 uC 10 cm 0.1 m 100 89.876 10 C10 uc 9 cm 0.09 m 123.45679 110.957 10 C 10 uC 8 cm 0.08 m 156.25 140.430 10 uC 10uC 7 cm 0.07 m 204.08163 183.419 10 uC 10 uC 6 cm 0.06 m 277.77777 249.654 10 uC 10 uc 5 cm 0.05 m 400 359.502

Two functions f and g are defined in the figure below.
0
0
g
he
8
Domain of
Range of s
Domain of g
Range of g
Find the domain and range of the composition gºf. Write your answers in set notatin.
(a)
Domain of gof: 0]
OD
(b)
Range of gof:
X
$
?

Math

Basic Math Solutions

Two functions f and g are defined in the figure below. 0 0 g he 8 Domain of Range of s Domain of g Range of g Find the domain and range of the composition gºf. Write your answers in set notatin. (a) Domain of gof: 0] OD (b) Range of gof: X $ ?

Submit
Is it possible to omit any numbers or hints in the KenKen puzzle below yet still solve the puzzle?
1
N
3
4
A
4
2
8
B
8+
1
3
1
11
1
1 -
C
2
7+
D
1
Choose the correct answer below
O O OLO
A. Yes, because the KenKen puzzle can still be solved if and on

Math

Mathematical Reasoning Solutions

Submit Is it possible to omit any numbers or hints in the KenKen puzzle below yet still solve the puzzle? 1 N 3 4 A 4 2 8 B 8+ 1 3 1 11 1 1 - C 2 7+ D 1 Choose the correct answer below O O OLO A. Yes, because the KenKen puzzle can still be solved if and only if exactly one number is removed and no hints are removed. B. Yes, because the KenKen puzzle can still be solved if and only if no numbers are removed and exactly one hint is removed. C. No, because the Kenken puzzle is designed such that all numbers and hints are required to solve the puzzle. OD. Yes, because there are many ways the KenKen puzzle can be solved with various numbers and hints missing

(1) are the following statements true or false
1. The direction of the electric field in all cases away from the positive charge and towards
the negative charge. T
2. An electric dipole consists of two charges Q, equal in magnitude and opposite in sign,
se

Physics

Electric Field and Potential Solutions

(1) are the following statements true or false 1. The direction of the electric field in all cases away from the positive charge and towards the negative charge. T 2. An electric dipole consists of two charges Q, equal in magnitude and opposite in sign, separated by a distance d. T 3. The electric flux is a maximum when the surface is parallel to the field. F 4. The flux through any surface enclosing a single point charge depends on the shape and size of the surface. 5. Dielectric decreases the capacitance. F

Kim, a small business owner, decides to withdraw $1,000 from her business
for personal expenses. This transaction would be recorded as
A. a debit to Drawing
B. a debit to Cash
C. a credit to Drawing
O D. a credit to Capital
SUBMIT

Math

Basic Math Solutions

Kim, a small business owner, decides to withdraw $1,000 from her business for personal expenses. This transaction would be recorded as A. a debit to Drawing B. a debit to Cash C. a credit to Drawing O D. a credit to Capital SUBMIT

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