Why is andrew lincoln from the walking dead so hot?

Iron-59 has a half-life of 44 days. a radioactive sample has an activity of 0.64 mbq. what is the activity of the sample after 8

myrzilka [38]

Radioactive decay is a pseudo-first order reaction. When you know the half-life of the material, you could use this equation.

A= A₀(1/2)^t/h
where
A is the final activity
A₀ is the initial activity
t is the time
h is the half-life

A = (0.64)(1/2)^88/44 = 0.16 mbq

6 0

4 years ago

How many amino acids will be in the polypeptide produced by the normal dna/mrna sequence?

vichka [17]

The number of amino acids that will be in the polypeptide chain produced by the normal DNA or MRNA sequence is usually 30 amino acids. Although the number of amino acids depends on the function of the generated DNA or RNA. The types of amino acids also differ depending on the function.

7 0

4 years ago

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A sample of oxygen gas has a volume of 36.7 L at 145 kPa and 65. ̊C. What volume will the sample have at STP?

xxTIMURxx [149]

Data Given:

Initial Volume = V₁ = 36.7 L

Initial Pressure = P₁ = 145 kPa

Initial Temperature = T₁ = 65 °C + 273 = 338 K

Final Volume = V₂ = ?

Final Pressure = P₂ = 101.325 kPa (Standard Pressure)

Final Temperature = T₂ = 273 K (Standard Temperature)

Formula used:
As number of moles are constant, so Ideal Gas equation in following form is used,
P₁ V₁ / T₁ = P₂ V₂ / T₂
Solving for V₂,
V₂ = P₁ V₁ T₂ / T₁ P₂
Putting Values,

V₂ = (145 kPa × 36.7 L × 338 K) ÷ (273 K × 101.325 kPa)

V₂ = 1798667 ÷ 27661.25

V₂ = 65.02 L

8 0

3 years ago

Which statement best discribes the usual form and funtion of a plants root system

Misha Larkins [42]

Answer:

The chemical energy is used to form ATP bonds. ... Which statement best describes the relationship between the products of photosynthesis ... Usually sap quickly covers the wound, and then the tree covers the wound with new growth

Explanation:

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3 years ago

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Complete the following paragraph to describe how the electrostatic forces in salt compounds can be overcome by interactions betw

motikmotik

Answer:

The words are: (2) ionic bonds; (3) ion-dipole forces; (4) soluble; (8) higher

Explanation:

-Salts are composed of ions that form a tightly packed and ordered network, which is called a crystal lattice, and it is held together by ionic bonds.

Explanation: salts are ionic compounds, which are composed by oppositely charged ions (cations and anions) which are bonded each other by ionic bonds, in an ordered arrangement, often a crystalline solid.

-When a salt is added to a polar solvent like water, the ions interact with the solvent molecules via ion-dipole forces, which overcome the forces originally holding the ions together.

Explanation: the molecules of a polar solvent are dipoles because they have dipolar momentum (a difference in charge due to a electronegativiy difference). When a salt is dissolved in a polar solvent, it dissociates in ions. So, the resulting interactions between these species are ion-dipole forces.

-The ions are then isolated and stabilized in solution via these interactions, and when this occurs for most of the salt compound, it is considered soluble in that solvent.

Explanation: the ions in solution are surrounded by solvent molecules which stabilizes them. A salt which is enterely dissolved in a solvent is soluble in that solvent.

-Due to the nature of the interaction between ions and solvent molecules, a concentration of ions can be dissolved higher in water than in alcohol.

Explanation: water molecules have unique properties that make water an universal solvent. Due to these properties and its polarity, water can dissolve larger quantities of salt than other polar solvents such as alcohol.

3 0

3 years ago