[PLEASE ANSWER ASAP, ON TIME LIMIT!] The pH level of a substance can be determined by the formula pH = –log[H+], where [H+] is the hydrogen ion concentration in moles per liter. An alkaline substance has a pH level between 7 and 14. Which ion concentration corresponds to an alkaline substance?
Answer choices in picture.
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Answers
Answer:
Option (2)
Step-by-step explanation:
pH level of a substance is determined by the formula,
pH = - log[H+}
where [H+] is the hydrogen ion concentration
Let the [H+] ion concentration = a
a = -log[H+]
log[H+] = -a
[H+] = 1 × [tex]10^{-a}[/tex]
Here 'a' is between 7 and 14.
Which means an alkaline substance must have the concentration between [tex]1\times 10^{-7}[/tex] to [tex]1\times 10^{-14}[/tex].
From the given options, [tex]5\times 10^{-12}[/tex] moles per liter lies in the given range.
Therefore, Option (2) will be the answer.
Answer:
B
Step-by-step explanation:
Edg2020
Related Questions
what are the common factors of 24 and 36
Answers
Answer:
12
Step-by-step explanation:
24 - 1,2,3,4,6,8,12,24
36 - 1,2,3,4,6,9,12,36
common factors are - 1,2,3,4,6,12
gcf - 12
t - 6 1/3 = - 9 3/4
solve this !
Answers
Answer: T=-3 5/12
Step-by-step explanation: 6 1/3-6 /13
6 1/3-9 3/4= -3 5/12
T= -3 5/12
Answer:
[tex]t=-2\frac{1}{12}[/tex]
Step-by-step explanation:
Imagine that you are doing an exhaustive study on the children in all of the daycares in your school district. You are particularly interested in how much time children spend in active play on weekends. You find that for this population of 2,431 children, the average number of minutes spent in active play on weekends is μ = 65.87, with a standard deviation of σ = 87.08. You select a random sample of 25 children of daycare age in this same school district. In this sample, you find that the average number of minutes the children spend in active play on weekends is M = 59.28, with a standard deviation of s = 95.79.
The difference between M and mu is due to the sampling error is ______.
Answers
Answer: The difference between M and mu is due to the sampling error is -6.59 .
Step-by-step explanation:
As per given:
in population, the average number of minutes spent in active play on weekends is μ = 65.87
In sample, the average number of minutes the children spend in active play on weekends is M = 59.28
Now, the difference between M and μ is due to the sampling error is M- μ
= 59.28 - 65.87
= -6.59
So, the difference between M and mu is due to the sampling error is -6.59 .
Find the slope of a line through the given points.
(3-7), (5,5)
Answers
Answer:
11/2
Step-by-step explanation:
Answer: m = 6
Step-by-step explanation: Start by writing down the slope formula.
m = y₂ - y₁ / x₂ - x₁
We take the second y minus the first y over the second x minus the first x.
m = 5 - (-7) / 5 - 3
m = 12 / 2
m = 6
So the slope of our line is 6.
the graph of the absolute value parent function, f(x) = |x|, is stretched horizontally by a factor of 5 to create the graph of g(x). what is the function of g(x)?
a. g(x) = |x+5|
b. g(x) = |1/5 x|
c. g(x) = |5x|
d. g(x) = 5 |x|
Answers
Answer: I’m thinking the answer is B
Step-by-step explanation:
Transformations are used to move a function from one position to another. The function of g(x) is [tex]g(x) = |\frac x5|[/tex]
Given that:
[tex]f(x) = |x|[/tex]
The rule of a horizontal stretch by factor k is:
[tex](x,y) \to (\frac xk,y)[/tex]
This means that:
[tex]g(x) = f(\frac xk)[/tex]
In this case, [tex]k = 5[/tex]
So, we have:
[tex]g(x) = f(\frac x5)[/tex]
Calculate [tex]f(\frac x5)[/tex]
[tex]f(\frac x5) = |\frac x5|[/tex]
Hence, the function of g(x) is
[tex]g(x) = |\frac x5|[/tex]
Read more about function transformation at:
brainly.com/question/12865301
A sweater that costs $35.98 has a 25% markdown. What is the FINAL price of the sweater? Round to the nearest cent/hundredths place.
Answers
Answer:
$26.99
Step-by-step explanation:
25% of 35.98 is 8.995
What is the measure of
Answers
Answer:
∠ RST = 72°
Step-by-step explanation:
∠ RST and 4x - 24 are alternate exterior angles and congruent, thus
4x - 24 = 3x ( subtract 3x from both sides )
x - 24 = 0 ( add 24 to both sides )
x = 24
Thus
∠ RST = 3x = 3 × 24 = 72°
To solve -3 = -19 + , what steps would you use? 19 5
Answers
Answer:
add divide
Step-by-step explanation:
Answer:
add divide
Step-by-step explanation:
.Rotating 180 degrees clockwise is the same as rotating 180 degrees counterclockwise. true or false
Answers
Answer:
False.
Step-by-step explanation:
Counterclockwise is different from Clockwise.
Answer:
False
Step-by-step explanation:
They are rotating a different direction
Find the average rate of change from a table.
Answers
Answer:
C. 1/2 (1 foot every 2 seconds)
plz help
What is the solution set for the inequality
2x + 5 ≥ 15
Answers
Answer:
[tex]x\geq 5[/tex]
Step-by-step explanation:
Answer:
X [tex]\geq[/tex] 5
What is equivalent to ³√27a³b⁷
Answers
Answer:uu
Step-by-step explanation:
THIS IS THE 3RD TIME I SAY THIS, PLZ HELP ME I WILL MARK BRAINLIEST
Answers
Answer:
1/4
Step-by-step explanation:
Sorry you had to wait sso long to get an answer, but here it is:
If you count out any of the cubes in a side of the original polygon, and then count the cubes in the same side of the smaller copy, you will see that there is a ratio. That ratio is 4 : 1, meaning that the scale factor is 1/4.
Hope this helps :)
Answer:
4:1
Step-by-step explanation:
first figure has 4 among the colomuns
second one has 1 so the differance is first one is 4 times as big as the second one
If someone answers I'll give them brainliest but pls help me
Answers
Answer: She forgot to change the mixed number into a fraction.
Step-by-step explanation:
Your class of 32 students is divided into fourths to create groups to answer a set of questions together Testigo to the front of the classroom and read off the groups answers how many students go to the classroom classroom. A) 2. B) 4. C) 6. D) 8.
Answers
Answer: D
Step-by-step explanation: 32 divided by 4 = 8
hellllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllppppppppppppppppppppppppp
Answers
Answer:
A has 25 yd on each side and B has 16 ft each side. Please mark Brainliest since I was the first one to respond
Step-by-step explanation:
Answer: (a) 25yd.
(b) 8 ft
Step-by-step explanation:
(a) Since each side of the square are equivalent and there are four sides of a square. So you do 100÷4=25
(b)The formula for a square is A=bh.
Since 8x8=64.
Is -20 solution x/-10=2?
Answers
Answer:
Yes
Step-by-step explanation:
Multiply -10 on both sides so x=-20
2/7(x+4)=−6 help
x=−35
x=−25
x = 25
x =35
Answers
Answer:
x= -25
Step-by-step explanation:
(3x 2)*7* _ x 12 x 7)
Answers
3528x^3
when you look it up remove the bar at the bottom or its weird right?
A jar contains chocolate chip cookies and Anzac
biscuits. If Jim makes a selection at random from the
jar, he has a probability of selecting an Anzac
biscuit. If there are 10 chocolate chip cookies, how
many Anzac biscuits are there?
Answers
Answer:
0.20
Step-by-step explanation:
there are 4 + 6 + 10 = 20 biscuits in the jar
probability of picking a chocolate chip biscuit = 4/20 = 1/5 = 0.20
-2(6+s) Greater than or equal to -15 - 2s
A. No solution
B. All real numbers
C. s is greater than or equal to 5
D. s is greater than or equal to negative 12
Answers
Answer:
I'm leaning mostly towards C Because there is a solution, None of them are real numbers and if they were, S would = 5 Especially positive S
~ Zachary
What would the equation be
Answers
Answer:
B= x + 5
C= 3x + 7
D= 5 * 7 =35 or 7 + 5= 12
A?= 3x^2 or 3x + x =4x
Step-by-step explanation:
Examine triangle ABC.
Triangle A B C. Angle B is 79 degrees. Exterior angle to A is (x + 5) degrees and the exterior angle to C is x degrees. What is the value of x?
37
48
127
138
Answers
Answer:
x=127
Step-by-step explanation:
total sum of all angle of triangle is 180 degree
Now,
taking angle A let interior angle be Y
taking angle C let interior angle be Z
Again, In angle A
the sum of interior angle and exterior angle is 180 degree being staright line
Or, y+(x+5)=180
or,x+y=180-5
or, x+y=175
or,y=175-x --------eqn 1
In angle C
the sum of interior angle and exterior angle is 180 degree being staright line
or, x+z=180
or, z=180-x ----------eqn2
Again, In triangle ABC
total sum of all angle of triangle is 180 degree.
Angle A+ Angle B + AngleC=180
Or, y+79+z=180 -------eqn3
putting the value of eqn-1 and eqn-2 in eqn-3
Or, 175-x+79+180-x=180
Or, 431-180= 2x
Or, 254÷2=x
hence X= 127 degree
Answer:
c127
Step-by-step explanation:
pls help me with this i will give crown
Answers
Answer:
C
Step-by-step explanation:
The easiest way to solve this would be to find the difference between the numbers. We can do [tex]-3-(-9)[/tex] to find the difference of [tex]6[/tex]. We can then make sure this is true for the rest of the sequence by adding 6 to each number.
[tex]-9+6=-3[/tex]
[tex]-3+6=3[/tex]
[tex]3+6=9[/tex]
[tex]9+6=15[/tex]
Now that we've verified that this is true, we know the answer is C
Answer:
u on go to padlet now
Step-by-step explanation:
Please help I have no clue how to do this
Answers
Answer:
D
Step-by-step explanation:
The Correct Answer Is D, You Will Estimate All Of Your Answers Up, And One Down.
The runners on a cross country team need to buy bottles of water for their next meet. Each runner will buy four bottles, and the coach will buy extra bottles. Which equation best describes the total number of bottles, b, the runners and coach will buy in terms of n, the number of runners on the team?
Answers
Answer:
b = n + n
Step-by-step explanation:
is the answer infinite, zero, or indefinite
2x - 1 = 1 - 2x
Answers
Answer:
x = 1/2
General Formulas and Concepts:
Pre-Algebra
Equality Properties
Multiplication Property of Equality Division Property of Equality Addition Property of Equality Subtraction Property of EqualityAlgebra I
Terms/CoefficientsStep-by-step explanation:
Step 1: Define
Identify
2x - 1 = 1 - 2x
Step 2: Solve for x
[Addition Property of Equality] Add 2x on both sides: 4x - 1 = 1[Addition Property of Equality] Add 1 on both sides: 4x = 2[Division Property of Equality] Divide 4 on both sides: x = 2/4Simplify: x = 1/2Which is the graph of f(x) = 3 - 2x?
Answers
Answer:
Step-by-step explanation:
It is estimated % of all adults in United States invest in stocks and that % of U.S. adults have investments in fixed income instruments (savings accounts, bonds, etc.). It is also estimated that % of U.S. adults have investments in both stocks and fixed income instruments. (a) What is the probability that a randomly chosen stock investor also invests in fixed income instruments? Round your answer to decimal places. (b) What is the probability that a randomly chosen U.S. adult invests in stocks, given that s/he invests in fixed income instruments?
Answers
Complete question :
It is estimated 28% of all adults in United States invest in stocks and that 85% of U.S. adults have investments in fixed income instruments (savings accounts, bonds, etc.). It is also estimated that 26% of U.S. adults have investments in both stocks and fixed income instruments. (a) What is the probability that a randomly chosen stock investor also invests in fixed income instruments? Round your answer to decimal places. (b) What is the probability that a randomly chosen U.S. adult invests in stocks, given that s/he invests in fixed income instruments?
Answer:
0.929 ; 0.306
Step-by-step explanation:
Using the information:
P(stock) = P(s) = 28% = 0.28
P(fixed income) = P(f) = 0.85
P(stock and fixed income) = p(SnF) = 26%
a) What is the probability that a randomly chosen stock investor also invests in fixed income instruments? Round your answer to decimal places.
P(F|S) = p(FnS) / p(s)
= 0.26 / 0.28
= 0.9285
= 0.929
(b) What is the probability that a randomly chosen U.S. adult invests in stocks, given that s/he invests in fixed income instruments?
P(s|f) = p(SnF) / p(f)
P(S|F) = 0.26 / 0.85 = 0.3058823
P(S¦F) = 0.306 (to 3 decimal places)
1/6 = 5/12 + p
Solving Equations.