I think the answer is: D) The reaction could spend more time in the reverse direction than in the forward direction.
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KI-starch paper allows the detection of strong oxidizers such as nitrite. It is used here to control diazotization of 4-nitroaniline. Nitrite oxidizes potassium iodide in order to form elemental iodine which reacts with starch to a blue-violet complex. With KI-starch paper, enough sodium nitrite is added to produce nitrous acid, which <span>then will react with 4-nitroaniline to form a diazonium salt.</span>
Answer:
magnesium + hydrochloride -> magnesium chloride + hydroxide
Explanation:
The displacement is 6.7 km to the northeast.
Displacement = 5 km + 1 km = 6 km to the east and 3 km to the north.
The net displacement is the <em>hypotenuse of a right-angled triangle</em> with sides
6 km and 3 km.
According to <em>Pythagoras’ Theorem</em>,
<em>a</em>^2 + <em>b</em>^2 = <em>c</em>^2, where <em>c</em> is the hypotenuse and <em>a</em> and <em>b</em> are the other two sides.
<em>c</em>^2 = (6 km)^2 + (3km)^2 = 36 km^2 + 9 km^2 = 45 km^2
<em>c</em> = √(45 km^2) = <em>6.7 km NE
</em>