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3 years ago

What is the x-coordinate of the function below when the y-coordinate is 0?(0,5) (2,-5)

Chemistry

1 answer:

maria [59]3 years ago

4 0

The equation of the function is assumed to be a straight line is of the form,

$y= mx+c$ , where $m,c$

are the gradient and the y intercept respectively.

The gradient is computed using the formula for the gradient, i.e

$m=\frac{y_2-y_1}{x_2-x_1} = \frac{-5-5}{2-0} = -5$ .

The equation of the line is,

$y= -5x+c\\=>5=-5(0)+c\\=> c= 5$

The equation of the function is ,

$y = -5x+5.$ .

The value of the x-coordinate when the y coordinate is 0 is found as shown below.

$0=-5x+5\\=>x=1\\$ .

so the x-coordinate is 1.

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2 years ago

What is the Ka of a weak acid (HA) if the initial concentration of weak acid is 4.5 x 10-4 M and the pH is 6.87? (pick one)

rewona [7]

Answer:

Ka = $4.04 \times 10^{-11}$

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$[H^+]=10^{-6.87}=1.35 \times 10^{-7}\ M$

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$Ka = \frac{(1.35 \times 10^{-7})^2}{0.00045 - 0.000000135}$

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2 years ago

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slega [8]

<h3><u>Answer;</u></h3>

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