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pashok25 [27]
3 years ago
10

ver time, an iron nail reacts with water to produce iron oxide, or rust. Which of the following is a signal that rusting has tak

en place? A. the release of heat and steam at the area where the mixture occured B. the release of an odor and the presence of bubbles C. the appearance of sparks D. a color change on the nail from silver to reddish-brown
Biology
2 answers:
Rasek [7]3 years ago
8 0
Over time, an iron nail reacts with water to produce iron oxide, or rust. Which of the following is a signal that rusting has taken place?

As rusting makes the color of the iron nail change to reddish-brown or answer is:
D. a color change on the nail from silver to reddish-brown

Hope I helped!
harina [27]3 years ago
8 0

D. a change on the nail from silver to reddish-brown

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A. 9

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Know what makes a solution acidic or basic (the pH number and the ions).
Brrunno [24]

To determine whether an acidic or basic solution, it is first necessary to compare the concentrations of the hydronium (H3O +) and hydroxide (OH-) ions in the solution.

In acidic solution, the concentration of H3O + ions is higher than that of OH- ions.

  • In acidic solution, the concentration of H3O + ions is higher than that of OH- ions. Such a solution can be achieved by adding a small part of the H3O + ions, for example. Acid solutions have a pH below 7, the further away from 7 the pH of the solution is the higher its acidity content.  According to Le Chatelier's principle, when a disturbance is caused to an equilibrium system, it tends to readjust in order to diminish the effects of that force. This means that if an acid is added to water, the H3O + ions will be in excess and the equilibrium will shift in the opposite direction to the left. Then these excess ions will react with the OH- ions. Thus, the concentration of OH- ions will decrease and the solution will become acidic.
  • In basic solutions, the concentration of OH- ions is higher than that of H3O + ions.  If we add a base to the water, it means that we will be adding OH- ions and, as explained in the previous section, by Le Chatelier's principle, the equilibrium of the water selfionization reaction will shift in the opposite direction, and the excess ions will react. with the H3O + ions, decreasing their concentration and making the basic solution.  Basic solutions have a pH greater than 7, the farther from 7 and closer to 14 the pH of the solution, the higher the basification content.

8 0
3 years ago
A group that consists of a common ancestor and all its evolutionary descendants is called a(n)
alisha [4.7K]

Answer: Option A) Clade

Explanation:

A clade refers to a group of animals or other organisms that have evolved from a common ancestor species. It could have taken several millions of years since the first ancestor lived.

Examples of clade include

- all the birds descended from a common ancestor specie

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Also, a clade is best identified using a phylogenetic tree.

7 0
3 years ago
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stepan [7]
<span>A) the presence of sodium potassium pumps.

</span>The other alternatives say about osmosis.
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3 years ago
How has technology changed farming?A.Farms produce less food than they used to.B.Pesticides are no longer used on most farms.C.F
soldi70 [24.7K]

Answer:

i think it would be c

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5 0
4 years ago
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