CHEMISTRY HIGH SCHOOL

For cells in which oxygen gas (O2) crosses the membrane by simple diffusion, what determines the rate at which oxygen enters the cell?

Answers

Answer 1
Answer:

Explanation:

The diffusion phenomenon is generated by the difference of concentration of a gas between two reference points.

In this case, the two points are: the inside of the cell and the surroundings of it.

The diffusion of oxygen will depend then of the concentration of it in the cell and the concentration in the outside:

\Delta O_2= Oxygen_(outside) - Oxygen_(cell)

The bigger this difference, the higher the diffusion rate of oxygen entering the cell.

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A farmer had an accident and spilled a chemical into his pond. Several days later, he notices many dead frogs around the pond. That summer, the number of gnats around the pond was higher than ever. This is becausea. the chemical is good for the gnats. b. the frogs are a limiting factor for the gnats. c. the gnats are a limiting factor for the frogs. d. the chemical is a limiting factor for the gnats.

According to the Arrhenius theory, when a basedissolves in water it produces
(1) CO3 2– as the only negative ion in solution
(2) OH– as the only negative ion in solution
(3) NH4 + as the only positive ion in solution
(4) H+ as the only positive ion in solution

Answers

According to Arrhenius Theory of acids and bases, when a base dissolves in water, the only negative ion produced is OH-.

Therefore, (2) OH– as the only negative ion in solution is the correct answer.

Hope this would help~

The apparent westward movement of a planet against the background of stars is called ____. (1 point)retrograde motion
revolution
rotation
universal gravitation

Answers

Answer:

retrograde motion  

Explanation:

All the planets have direct motion or progade motion i.e. they move in eastward direction around the Sun. The exceptions are Venus and Uranus which apparently move westwards. This is type of motion is known as retrograde motion. Venus and Uranus move opposite to the other planets motion against the background of stars.

Answer:

retrograde motion

Explanation:

Eugen Goldstein discovered in 1886 that atoms also have _________ charges.a. neutral
b. positive
c. negative

Answers

The correct answer for the question that is being presented above is this one: "b. positive" Eugen Goldstein discovered in 1886 that atoms also have positive charges. He was a German physicist and an early investigator of discharge tubes. He also discovered the anode rays.

A solution of ammonia has a pH of 11.8. What is the concentration of OH– ions in the solution? Useful formulas..

Answers

The concentration of hydroxideions in the given aqueous solution is equal to  6.3 ×10⁻³ M.

What is the pOH?

pOH can be calculated from the negative logarithm of the concentration of hydroxideions in the given aqueous solution.

Mathematically, the formula of the pOH can be represented as shown below:

pOH = - log ([OH⁻ ])                                                

and pH  +  pOH  =  14                                                       ..............(1)

Where [OH⁻] is representing the concentration of hydroxide ions in an aqueous solution.

Given, the value of the pH of the ammonia solution, pH = 11.8

Substitute the value of the pH in equation (1):

pH + pOH  =  14    

11.8  - log [OH⁻] = 14

- log [OH⁻] = 14 -11.8

log [OH⁻] = - 2.2

[OH⁻] = 6.3 × 10⁻³ M

Therefore, the concentration of the hydroxideions is equal to 6.3 ×10⁻³ M.

Learn more about pOH, here:

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They are asking you for OH- ions concentration, which is why you have to find the pOH of the solution. You can easily do this with this formula:

pH + pOH = 14

Solve for pOH and you get:

pOH = 14 - pH

Replace the pH with it's value:

pOH = 14 - 11.8
pOH = 2.2

Now that you have the pOH you can find the concentration of OH- ions with this formula:

pOH = -log[OH-]

Solve the formula for [OH-] and you get:

[OH-] = 10^(-pOH)

Now replace pOH with it's value:

[OH-] = 10^(-2.2)
[OH-] = 0.006309 M

The concentration of OH- atoms is 0.006309M or in the scientific notation 6.309×10^(-3)M

How do hydrogen atoms make a covalent bond?

Answers

The hydrogen compound is a combination of equally matched atoms. The atoms will share each other's single electron, forming the bond.
Hydrogen atoms only need two electrons in their outer level. The covalent bond holds the two atoms together.

Why graphite can rub off the pencil onto the paper

Answers

Graphite is an extremely soft material and is formed in layers as well.This combination of traits allows for the graphite to scrape off of the pencil tip and onto the paper.
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