True or False: Plants don't have brains, but they still adapt to their environments.

Answers

Answer 1

Answer:

True, Plants don't have brains, but they still adapt to their environments.

What is adaptation?

Adaptation is a process where they are changing their nature to suit the environment.

We have seen that plants do adaptation according to the environment, as in the summer season their leaves are hanging down but in the rainy season they show blossoms and green leaves. So, according to the environment for the survival and reproduction they adapt their body.

Hence, plants have no brains, but they still adapt.

To learn more about adaptation, visit the below link:

brainly.com/question/2396978

Answer 2

Answer:

Answer:

True

Explanation:

I just took that last year, and got a100%

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Which solution has the greatest buffer capacity?

Answers

There isn't any scale that directly measures buffering capacity, but as a rule, buffering capacity increases as the concentrations of the acid/base and its conjugate in solution increases. Therefore, the solution with greatest buffering capacity will have the highest concentrations of acid/base pairs.

Buffer capacity is defined as the capacity of a buffer to resist changes in pH upon addition of an acid or a base. The buffer capacity is high when the concentration of the acid and its conjugate base is high, and the pH of the solution is near the pKa value of the weak acid.

The greater the buffer capacity, the better it can resist pH changes upon addition of an acid or base. The buffer capacity of a solution is highest when the pH is near the pKa value of the weak acid.

A buffer is a solution that has the ability to resist changes in pH upon the addition of an acid or base. The buffer capacity is highest when the pH of the buffer is close to the pKa of the weak acid component in the buffer. Therefore, the buffer capacity is the highest when the pH is equal to the pKa value of the weak acid.

Therefore, the solution with the greatest buffer capacity is the one with the highest concentration of both the weak acid and its conjugate base, which can resist the changes in pH with the addition of an acid or base.

Answers

Answer:

0.004 moles

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

$n = (N)/(L) \n$

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

$n = \frac{2.4 * {10}^(21) }{6.02 * {10}^(23) } \n = 0.003986$

We have the final answer as

0.004 moles

Hope this helps you

How many moles of hydrogen are needed to produce 13.78 mol of ethane?

Answers

This is an incomplete question, here is a complete question.

The following balanced equation shows the formation of ethane (C₂H₆).

$C_2H_2+2H_2\rightarrow C_2H_6$

How many moles of hydrogen are needed to produce 13.78 mol of ethane?

1) 3.445 mol

2) 6.890 mol

3) 27.56 mol

4) 55.12 mol

Answer : The number of moles of hydrogen needed are, (3) 27.56 mol

Explanation : Given,

Moles of ethane = 13.78 mol

The given balanced chemical reaction is:

$C_2H_2+2H_2\rightarrow C_2H_6$

From the balanced chemical reaction we conclude that,

As, 1 mole of ethane produced from 2 moles of hydrogen

So, 13.78 mole of ethane produced from $13.78* 2=27.56$ moles of hydrogen

Thus, the number of moles of hydrogen needed are, 27.56 mol

Ethane is an alkane. Methane is also an alkane and is considered to be the simplest alkane. The difference is ethane has only 2 carbon. That carbon has 6 hydrogen attached to it. So what we do is we multiply the moles of ethane by the number of hydrogen (by dimension analysis) resulting to 82.68 moles H.

The ph of a buffer does not depend much on the concentrations of its acid–base conjugate pair because

Answers

Answer:

It could react with the present hydride or hydroxile ions.

Explanation:

Hello,

One the main features of buffers, is that when the acid-base conjugates are formed they could react with the added $H^+$ or $OH^(-1)$ in order to keep the pH as constant as its buffer capacity allows it.

Best regards.

Final answer:

A buffer solution maintains a stable pH primarily through the action of its acid-base conjugate pair reacting to counter changes, a property known as buffer capacity. High concentrations increase buffer capacity, allowing more acid or base to be neutralized. However, exceeding the buffer capacity can lead to pH changes.

Explanation:

The pH of a buffer solution doesn't greatly depend on the concentrations of its acid-base conjugate pair as the buffer's job is to keep the pH relatively constant. This is achieved by having appreciable amounts of its weak acid–base pair in the solution. If a strong acid or base is introduced into the system, the buffer pair reacts to counteract these changes. This is called buffer capacity.

For instance, consider a buffered solution composed of acetic acid and its conjugate base, acetate. The system can resist changes in pH upon addition of small quantities of an acid or base. This is because acetic acid and acetate can consume small additions of hydrogen ions (from an acid) or hydroxyl ions (from a base), keeping the overall pH stable.

When concentrations of the acid-base pair are high, the buffer capacity increases and hence more amounts of acid or base can be neutralized without a significant change in pH. However, there are limits to this capacity. If excessive amounts of acid or base are added, they may exceed the buffer's capacity, and its acid/base pairs will be either largely consumed or overrun, leading to changes in pH.