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3 years ago

1. Brandon is flying to the Western United States. His plane manages to cover 700 miles

Chemistry

1 answer:

torisob [31]3 years ago

4 0

Answer:

a. Bradon was flying at the speed rate of 350 miles/hour.

b. His velocity is 350 miles/hour due west.

Explanation:

The speed of an object is the ratio of distance moved to the time taken, while velocity is the ratio of displacement to time taken. The major difference between speed and velocity is that speed is a scalar quantity, while velocity is a vector quantity.

Vector quantities are described by both magnitude and direction, while scalar have only magnitude.

From the question,

distance = 700 miles and time taken = 2 hours

a. speed = $\frac{distance}{time}$

= $\frac{700}{2}$

= 350 miles/hour

∴ Bradon was flying at the speed rate of 350 miles/hour.

b. velocity = $\frac{displacement}{time}$

displacement = 700 miles of west, time taken = 2 hours

velocity = $\frac{700}{2}$

= 350 miles/hour due west

His velocity is 350 miles/hour due west.

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Answer:

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Explanation:

The borax (Na₂borate) in water is in equilibrium, thus:

Na₂borate(s) ⇄ borate²⁻(aq) + 2Na⁺(aq)

When you add just borax, the moles of Na²⁺ are twice the moles of borate²⁻, that means 2borate²⁻=Na⁺ (1)

The ksp is defined as:

ksp = [borate²⁻] [Na⁺]²

Then, borate²⁻(B₄O₇²⁻) reacts with HCl thus:

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The moles of HCl that reacts with B₄O₇²⁻ are:

0,500M×0,01200L = 6,00x10⁻³ mol of HCl

As two moles of HCl react with 1 mol of B₄O₇²⁻, the moles of B₄O₇²⁻ are:

6,00x10⁻³ mol of HCl× $\frac{1molB_{4}O_{7}^{2-}}{2molHCl}$ = 3,00x10⁻³ mol of B₄O₇²⁻

For (1), moles of Na⁺ are 3,00x10⁻³ mol ×2 = 6,00x10⁻³ mol of Na⁺

The [borate²⁻] is 3,00x10⁻³ mol of B₄O₇²⁻/0,00850L = 0,353M

And [Na⁺] is 6,00x10⁻³ mol of Na⁺ / 0,00850L = 0,706M

Replacing in the expression of ksp:

ksp = [0,353] [0,706]²

ksp = 0,176

I hope it helps!

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2 years ago

How many kilojoules of heat are released when 0.72 mole of oxygen gas are used to combust methane?

KonstantinChe [14]

0.72 mole of oxygen would produce 320.4 kJ of heat.

Explanation:

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According to the equation,

2 moles of O₂ produces 890 kJ of heat

So, 0.72 moles of O₂ will produce:

$= \frac{890}{2} X 0.72\\\\= 445 X 0.72\\\\= 320.4 kJ$

Therefore, 0.72 mole of oxygen would produce 320.4 kJ of heat.

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3 years ago

The data table below shows four different chemical reactions, the temperature change of each, and the duration of the change in

mestny [16]

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Answer:

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3 years ago