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mamaluj [8]
3 years ago
6

When temperature increases, the random movement of molecules increases which subsequently increases diffusion rate. If you have

the same concentration of each of the following substances and they all have the same molecular weight, predict which substance will have the greatest diffusion rate?
a. substance #3 in aliquid at 64' F
b. substance 14 in a gas at 32 F
c. substance #2 in aliquid at a 32°F
d. substance #5 in a gas at 78' F
e. substance in a semisolid at 78' F
Chemistry
1 answer:
Degger [83]3 years ago
5 0

Answer:

d. substance #5 in a gas at 78' F

Explanation:

Diffusion in substances simply has to do with the movement of the particles of a substance from one point to another.

The rate of diffusion varies in gases, liquids and solids. Gas molecules are usually more energetic than molecules of solids and liquids. Gases and are also in constant random motion at high velocities.

Therefore, substance #5 in a gas at 78' F will have the greatest diffusion rate.

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Answer:

122 forenhieght

Explanation:

(50°C × 9/5) + 32 = 122°F

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4 years ago
Which of the following will produce a precipitate?
Marta_Voda [28]

The correct answer is: c) Co2+(aq) + Zn(NO3)2 (aq)

Precipitation reaction can be defined as the process of the formation of an insoluble salt. An insoluble salt is formed when two solutions containing soluble salts are combined (from its aqueous ions). precipitation reaction refers to the. The insoluble salt that falls out of solution is called precipitate


5 0
4 years ago
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Freezing point depression is:
CaHeK987 [17]
The answer to this question is D
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4 years ago
What is the half-life of a pharmaceutical if the initial dose is 500 mg and only 31 mg remains after 6 hours?
Sergeu [11.5K]

Answer:

\large \boxed{\text{b. 1.5 h}}

Explanation:

1. Calculate the rate constant

The integrated rate law for first order decay is

\ln \left (\dfrac{A_{0}}{A_{t}}\right ) = kt

where

A₀ and A_t are the amounts at t = 0 and t

k is the rate constant

\begin{array}{rcl}\ln \left (\dfrac{500}{31}\right) & = & k \times 6\\\\\ln 16.1 & = & 6k\\2.78& =& 6k\\k & = & \dfrac{2.78}{6}\\\\& = & 0.463 \text{ h}^{-1}\\\end{array}

2. Calculate the half-life

t_{\frac{1}{2}} = \dfrac{\ln2}{k} = \dfrac{\ln2}{\text{0.463  h}^{-1}} = \textbf{1.5 h}\\\\ \text{The half-life is $\large \boxed{\textbf{1.5 h}}$}

4 0
3 years ago
The representative particle for zinc is the
balandron [24]

Answer: Option B) Atom

Explanation:

An atom is the simplest particle of an element that can retain all the chemical properties of the element, and therefore take part in a chemical reaction.

Thus, an atom of zinc (Zn) represent fully the entire properties of elemental Zinc. For instance: an atom of zinc has a mass of 65.38g.

3 0
3 years ago
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