For x y chart 19.36.2.27.13
Answer:
B
Step-by-step explanation:
<u>A substance is tested and has a </u><u>Ph of 7.0</u><u>. It would be </u><u> a weak acid. </u>
<u>The correct option is </u><u>(c) a weak acid .</u>
<u></u>
What is the nature of substance if the pH is less than 7?
- Acidity is defined as pH below 7. More than 7 pH is considered basic.
- Each whole pH number below 7 is ten times more acidic than the next higher value since the pH scale is logarithmic.
- For instance, pH 4 is 100 times (10 times 10) more acidic than pH 6, while pH 5 is ten times (10 times) more acidic than pH 4.
What is pH?
- The pH scale determines how acidic or basic water is.
- The range is 0 to 14, with 7 representing neutrality.
- Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7.
- In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.
Learn more about pH
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Answer:
<u>-289 degrees</u>
Step-by-step explanation:
You are looking for what is called <u>Coterminal Angles</u>.
To find a coterminal angle between 0 and 360 you <u>add or subtract</u> 360.
- In this case, we subtracted 360 from 71
- 71 - 360 = -289
- tan(-289) = 2.90
- If TAN 71 = 2.90 and TAN -289 = 2.90, you know -289 is your answer.
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Answer:114 red marbles
Step-by-step explanation:
19r + 1b = 20
120/20=6 black marbles
19 x 6 = 114 red marbles
