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REY [17]
3 years ago
10

Potassium loses electrons when it reacts with oxygen. Which statement is true of potassium in this reaction? A. It reduces. B. I

t undergoes synthesis. C. It undergoes redox. D. It oxidizes​
Physics
1 answer:
allochka39001 [22]3 years ago
5 0
<h2>Answer:</h2>

[D] It oxidizes.

4K + O2 → 2K2O, <u>potassium oxide</u> is produce.

We have the equation, in which when <u>potassium</u> react with <u>oxygen</u>, as a product it formed <u>Potassium oxide</u> which means <u>adding of oxygen</u> (<u>oxidation</u>).

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Answer:

29.75 revolutions

Explanation:

The kinematic formula for distance, given a uniform acceleration a and an initial velocity v₀, is

d=v_0t+\frac{1}{2}at^2

This car is starting from rest, so v₀ = 0 m/s. Additionally, we have a = 9.2/9.7 m/s² and t = 9.7 s. Plugging these values into our equation:

d=0t+\frac{1}{2}\left(\frac{9.2}{9.7}\right)(9.7)^2\\d=\frac{1}{2}(9.2)(9.7)\\d=4.6(9.7)\\d=44.62

So, the car has travelled 44.62 m in 9.7 seconds - we want to know how many of the tire's <em>circumferences</em> fit into that distance, so we'll first have to calculate that circumference. The formula for the circumference of a circle given its diameter is c=\pi{d}, which in this case is 47.8π cm, or, using π ≈ 3.14, 47.8(3.14) = 150.092 cm.

Before we divide the distance travelled by the circumference, we need to make sure we're using the same units. 1 m = 100 cm, so 105.092 cm ≈ 1.5 m. Dividing 44.62 m by this value, we find the number of revs is

44.62/1.5\approx29.75 revolutions

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What causes plastic flow to occur?
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Explanation:

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