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
Kipish [7]
3 years ago
5

If the half life of iridium-182 is 15 years, how much of a 3 gram sample is left after 2 half-lives?

Chemistry
1 answer:
padilas [110]3 years ago
4 0

Answer:

D. 0.75 grams

Explanation:

The data given on the iridium 182 are;

The half life of the iridium 182, t_{(1/2)} = 15 years

The mass of the sample of iridium, N₀ = 3 grams

The amount left, N(t) after two half lives is given as follows;

N(t) = N_0 \left (\dfrac{1}{2} \right )^{\dfrac{t}{t_{1/2}} }

For two half lives, t = 2 × t_{(1/2)}

∴ t = 2 × 15 = 30

\dfrac{t}{t_{(1/2)}} = \dfrac{30}{15} = 2

\therefore N(t) = 3 \times\left (\dfrac{1}{2} \right )^2 = 0.75

∴ The amount left, N(t) = 0.75 grams

You might be interested in
What is thermodynamics?
Pavel [41]

Answer:

The answer to your question is B

6 0
3 years ago
PLEASE HELP!! :')
hichkok12 [17]

box cooker: I'd cook something small like a chicken since it takes longer to cook things with a box cooker (3 hours oh lord)

Parabolic cooker: I would cook something like hot dogs or steak since it's great for grilling at high temperatures

Concentrator cooker: same answer for the parabolic cooker since they are kind of the same thing, they cook fast :)

3 0
3 years ago
From your solubility curve determine the solubility of ammonium chloride in g/100 mL of H2O at 60 Degrees Celsius.
Natasha_Volkova [10]
To determine the solubility of ammonium chloride, we first find the curve for ammonium chloride in the chart for solubility measured in grams of solute per 100 mL of water solvent. Reading the chart at 60 degrees Celsius, approximately 55 grams of ammonium chloride will dissolve in 100 mL of water. Therefore, the solubility of ammonium chloride is 55 grams NH4Cl/100mL H2O at 60°C.
4 0
3 years ago
Which of the following chemical agents is used for sterilization? Which of the following chemical agents is used for sterilizati
lozanna [386]

Answer:

The correct answer is super critical fluids.

Explanation:

Supercritical fluids are the fluids which are compressed below their critical temperature, kept in liquid state and used above their boiling point.The most common example of this are : liquid carbon dioxide gas and water.

  • They have properties of gas and liquid.
  • They can easily effuse through solids like gas and dissolves other substance in them like liquid.
3 0
3 years ago
Define the following:
Advocard [28]

Answer:

A. Passive Transport is migration of a molecule from one side of the cell membrane to the other, from an area of high electrochemical potential to a region of lower electrochemical potential.

B. Diffusion is an individual molecule of a material moving from a high-concentration location to a low-concentration area over a semipermeable barrier

C. Osmosis is the movement of molecules of water through a cell's partly permeable membrane from a liquid with a large concentration of water molecules to a solution with a lower concentration of water molecules.

D. Facilitated Diffusion are molecules that diffuse across the plasma membrane with assistance from membrane proteins, such as channels and carriers.

E. Active transport is the transport of molecules across a cell membrane against a concentration gradient from a low-concentration region to a high-concentration region.

F. Selectively permeable is when some chemicals or ions pass across the membrane, while others are blocked.

G. Cellular respiration are organisms mix oxygen with food molecules, directing the chemical energy in these substances into life-sustaining processes while eliminating carbon dioxide and water as waste material.

Explanation:

8 0
3 years ago
Other questions:
  • A substance that is dissolved in a solution is called a(n) __________________.
    5·2 answers
  • What is the H+ if the pH of a solution is 1.65?
    11·1 answer
  • Consider a cloudless day on which the sun shines down across the United States. If 2014 kJ of energy reaches a square meter( m 2
    6·1 answer
  • The conversion of co2 and h2o into organic compounds using energy from light is called what?your answer
    14·1 answer
  • How many molecules of NH3 are produced from 8.01x10-4g of H2
    9·1 answer
  • Look at the diagram of an electrolytic cell below.
    8·1 answer
  • Propane is used as a fuel for camp stoves. It undergoes combustion to form carbon dioxide and water.
    6·1 answer
  • Can someone please help me ? Click the picture
    10·1 answer
  • Investigation: Cells are the basic unit of life.
    9·2 answers
  • An ion from a given element has 20 protons and 18 electrons.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!