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1. ### When a 0.0572g strip of Mg is reacted with excess HCl, 52.0 mL of gas is collected over water in a eudiometer...?

... Gas Law: [(755.5 mmHg) (52.0 mL)] / 292 K = [(760.0 mmHg) (x)] / 273 K x = 48.3 mL I'll use...

2 Answers · Science & Mathematics · 24/11/2020

2. ### First, find f '(x) and then find f(x). f ''(x) = x^3 − 4x + 8,  f '(1) = 0,  f(1) = 4?

...25/4)) dx f = (1/20)x⁵ – (2/3)x³ + 4x² – (25/4)x + K   use f(1) = 4 to get K 4 = (1/20)1⁵ – (2/3)1³ + 4•...

2 Answers · Science & Mathematics · 23/11/2020

3. ### Why does the American anti-gun lobby feel human nature different here than in places like the Tigray area of Ethiopia? ?

The U.S. anti-gun lobby IGNORES the Black on Black Genocide in Liberal controlled cities by illegal gun "owning" drug dealing murderers!

2 Answers · Politics & Government · 23/11/2020

4. ### Velocity and total momentum?

... + 0.7632ĵ + 14.1087k) / 5.46 vcm = 1.7737...î + 0.1397...ĵ + 2.5840... k rounding the the three s.d. of the question numerals vcm ≈ 1....

1 Answers · Science & Mathematics · 23/11/2020

5. ### How is Trump currently working to make America great, again?

...empty Diet Coke bottles, cheeseburger wrappers & K .F.C. buckets.  He hopes to keep them...

8 Answers · Politics & Government · 23/11/2020

6. ### The firstorder reaction 3A→2B+C has rateconstant 0.538s−1. If theinitial concentration of A is0.867mol L−1, what is the halflife of reaction?

For first order reaction, the half-life is independent of the initial concentration. Half-life, t½ = ln(2)/ k = ln(2)/(0.538 s⁻¹) = 1.29 s

1 Answers · Science & Mathematics · 23/11/2020

7. ### The rate constant k for the first-order reaction A→3B is 0.527 s−1. After how many seconds will 45.0% of the initial amount of A remain?

Method 1: ln(A/Aₒ) = -kt ln(45%) = -(0.527 s⁻¹)t Time taken, t = -ln(0.45)/0.527 s = 1.52 s ==== Method 2: Let n be the number of half-lives taken. 45% = (1/2)ⁿ ln(0.45) = ln(0.5)ⁿ n ln(0.5) = ln(0.45) n = ln(0.45...

1 Answers · Science & Mathematics · 23/11/2020

8. ### define the slope of the line for the linear plot of a first order reaction: ln[A]=?(t)+ln[A]0?

The slope is the negative of the rate constant, k . So ? = - k

1 Answers · Science & Mathematics · 22/11/2020

9. ### For a 1storder linear plot of ln[A] vs. time, where the ln[A] at 5 hours was −0.742, and the ln[A] at 10 hours was −1.484. What is constant?

Slope = delta y / delta x Slope = -1.484 - (-0.742) / (10-5) = -0.148 hr^-1 k = -slope = 0.148 hr^-1

1 Answers · Science & Mathematics · 22/11/2020

10. ### Chromatography???

You don't need chromatography in this case if the syrup that's being carried is full of cocaine there's a simple field test kit where they will just squirt a little bit of the solution on it if it turns blue then it's got cocaine in it

1 Answers · Science & Mathematics · 23/11/2020