Suppose you are given an unknown solution and you need to test its pH. The pH meter is broken, and all you have is the indicator bromothymol blue to use. You add two drops of bromothymol blue to 10 mL of your unknown, and the solution turns a bright yellow. Which of the following is the best estimate of the pH of the unknown solution?
a. 8.5
b. 11.5
c. 1.5
d. 7.0

Answer: The best estimate of the pH of the unknown solution is 1.5. Option C.

Explanation:

A substance which shows different colours in acidic and basic media is called an indicator. Typical examples of common indicators includes:

--> Litmus: colour in acid ( red), colour in base (blue) and colour in neutral (purple).

--> Methyl orange: Colour in acid (red), colour in base (yellow) and colour in neutral (Orange).

--> Phenolphthalein: Colour in acid (colourless), colour in base (pink) and colour in neutral (colourless).

--> BROMOTHYMOL BLUE: Colour in acid ( yellow), colour in base (blue) and colour in neutral (green).

The indicators are themselves weak organic acids or bases and hence slightly dissociated in solution. The colour of the indicator at any given point depends on the relative proportion of the dissociated ions to the undissociated molecules since they have different colours.

From the question, since the pH meter is broken, and the pH of the unknown solution is to be determined,using an indicator instead. The best estimate of the pH of the unknown solution is 1.5. This is so because BROMOTHYMOL BLUE is blue when the pH is greater than 7.6, green when the pH is between 6-7.6, and yellow when the pH is less than 6. And pH value of 1.5 is less than 6, indicating the solution is very acidic.

Which statement correctly describes an interaction between organelles in the model?
A
Letter U and letter S control the collection and release of waste from the cell.
В.
Letter T and letter R store the genetic material necessary for replication of the cell.
ОООО
C
Letter Q and letter S are responsible for creating and delivering nutrients throughout the cell.
D
Letter U and letter R are involved with the processes of transcription and translation for the cell.

How can a hunter help wildlife conservation efforts? A, By making sure to always obey the rules of firearm safety By making sure to always obey the rules of firearm safety B, By always bagging under the daily limit By always bagging under the daily limit C, By donating to conservation organizations, or helping to build habitats for local wildlife By donating to conservation organizations, or helping to build habitats for local wildlife D, By always bagging over the daily limit By always bagging over the daily limit

Select the correct answer.
Why will a decrease in pH of the stomach affect protein digestion?
OA. Decrease in pH of the stomach will distort the structure of peptides in food, which affects the action of the enzyme pepsin.
O B. Decrease in pH of the stomach will distort the active site of the enzyme pepsin, which affects its
action.
O C. Decrease in DH of the stomach will distort the active site of the enzyme lipase, which affects protein digestion. Yes

please help I don't understand ​

Which of the following rows in the table best compares the function of a plant's xylem and phloem? I Need help ASAP!

Row 1

Xylem

- transports glucose absorbed by the roots to the rest of the plant


- alive at maturity

Phloem

- transports water and nutrients produced by photosynthesis in the leaves to the rest of the plant


- dead at maturity


Row 2

Xylem

- transports glucose produced by photosynthesis in the leaves to the rest of the plant


- dead at maturity

Phloem

- transports water and nutrients absorbed by the roots to the rest of the plant


- alive at maturity


Row 3

Xylem

- transports water and nutrients absorbed by the roots to the rest of the plant


- dead at maturity

Phloem

- transports glucose made during photosynthesis in the leaves to the rest of the plant


- alive at maturity


Row 4

Xylem

- transports water and nutrients produced by photosynthesis in the leaves to the rest of the plant


- alive at maturity

Phloem

- transports glucose absorbed by the roots to the rest of the plant


- dead at maturity

please help me im timed and will give brainiest:(​

Leona drew a diagram to compare ginkgoes and conifers.



Which characteristic belongs in the area marked X?

are deciduous
produce cones
look like palm trees
are the largest group