1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
alina1380 [7]
3 years ago
9

4. If 175 undecayed nuclei remain from a sample of 2800 nuclei, how many half-

Chemistry
1 answer:
Irina18 [472]3 years ago
8 0

Answer:

X = 4

Explanation:

Start 2800

End 175

175 = 2800x(0.5)^X

175/2800 = 0.5^X

0.0625 = 0.5^X

log(0.5 x) = log(0.0625)

x · log(0.5) = log(0.0625)

-0.301x = -1.204

x = -1.204/-0.301

x = 4

You might be interested in
Which agents cause both chemical and physical weathering?
jeka94

Answer:

iron

Explanation:

4 0
3 years ago
How many grams of sulfur in 4.20 x 1021 atoms of sulfur?
Stolb23 [73]

Answer:

look it up

Explanation:

6 0
2 years ago
Mercury’s atomic emission spectrum is shown below. Estimate the wavelength of the orange line. What is its frequency? What is th
lions [1.4K]

The wavelength of the orange line is 610 nm, the frequency of this emission is 4.92 x 10¹⁴ Hz and the energy of the emitted photon corresponding to this <em>orange line</em> is 3.26 x 10⁻¹⁹ J.

<em>"Your question is not complete, it seems to be missing the diagram of the emission spectrum"</em>

the diagram of the emission spectrum has been added.

<em>From the given</em><em> chart;</em>

The wavelength of the atomic emission corresponding to the orange line is 610 nm = 610 x 10⁻⁹ m

The frequency of this emission is calculated as follows;

c = fλ

where;

  • <em>c is the speed of light = 3 x 10⁸ m/s</em>
  • <em>f is the frequency of the wave</em>
  • <em>λ is the wavelength</em>

f = \frac{c}{\lambda } \\\\f = \frac{3\times 10^8}{610 \times 10^{-9}} \\\\f = 4.92 \times 10^{14} \ Hz

The energy of the emitted photon corresponding to the orange line is calculated as follows;

E = hf

where;

  • <em>h is Planck's constant = 6.626 x 10⁻³⁴ Js</em>

<em />

E = (6.626 x 10⁻³⁴) x (4.92 x 10¹⁴)

E = 3.26 x 10⁻¹⁹ J.

Thus, the wavelength of the orange line is 610 nm, the frequency of this emission is 4.92 x 10¹⁴ Hz and the energy of the emitted photon corresponding to this <em>orange line</em> is 3.26 x 10⁻¹⁹ J.

Learn more here:brainly.com/question/15962928

6 0
2 years ago
A chemist prepares a solution of copper(II) sulfate CuSO4 by measuring out 31.μmol of copper(II) sulfate into a 150.mL volumetri
baherus [9]

Answer:

The concentration of the copper (II) sulfate solution is 2.06 * 10^2 μmol/L or 2.06 * 10^2 μM

Explanation:

The concentration of a solution is the amount of solute dissolved in a given volume of solution. In this case, the concentration of the copper(II) sulfate solution in micromoles per liter (symbol ) is the number of micromoles of copper(II) sulfate dissolved in each liter of solution. To calculate the micromoles of copper(II) sulfate dissolved in each liter of solution you must divide the total micromoles of solute by the number of liters of solution.

Here's that idea written as a formula: c= n/V

where c stands for concentration, n stands for the total micromoles of copper (II) sulfate and V stands for the total volume of the solution.

You're not given the volume of the solution in liters, but rather in milliliters. You can convert milliliters to liters with a unit ratio: V= 150. mL * 10^-3 L/ 1 mL = 0.150 L

Next, plug in μmol and liters into the formula to divide the total micromoles of solute by the number of liters of solution: c= 31 μmol/0.150 L = 206.66 μmol/L

Convert this number into scientific notation: 2.06 * 10^2 μmol/L or 2.06 * 10^2 μM

3 0
2 years ago
How do I know the point which a solid will turn to a liquid?
oee [108]

There is a special temperature for every substance called the melting point. When a solid reaches the temperature of its melting point, it can become a liquid.  

4 0
3 years ago
Read 2 more answers
Other questions:
  • What is the beta decay of uranium-237
    9·1 answer
  • 1) List the number of protons, neutrons, and electrons in Carbon-13.
    11·1 answer
  • 7. If 100.0 grams of Hydrogen burns, how many moles of Water will<br> form?
    13·1 answer
  • The larger oxygen atom, with more protons, is more ____________ than the hydrogen atom and attracts the electron pair closer.
    15·1 answer
  • In a neutral atom, the number of protons _______ the number of electrons.
    5·2 answers
  • Decreases in melatonin result in decreased?
    7·2 answers
  • How many grams of water are frozen if 6,346 Joules of energy was given
    15·1 answer
  • Eyes, nose, mouth would each be an example of a(n)
    15·1 answer
  • What is the molar mass of NaOCI?
    14·1 answer
  • True or False Liquids can be easily poured because liquid molecules can roll or slide over each other.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!