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3 years ago

Ionization of sodium dichromate

Chemistry

1 answer:

inessss [21]3 years ago

5 0

Explanation:

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In a certain industrial process involving a heterogeneous catalyst, the volume of the catalyst (in the shape of a sphere) is 10.

olga nikolaevna [1]

Answer:

a. The second run will be faster.

d. The second run has twice the surface area.

Explanation:

The rate of a reaction is proportional to the surface area of a catalyst. Given the volume (V) of a sphere, we can find its surface area (A) using the following expression.

$A=\pi ^{1/3} (6V)^{2/3}$

The area of the 10.0 cm³-sphere is:

$A=\pi ^{1/3} (6.10.0)^{2/3}=22.4cm^{2}$

The area of each 1.25 cm³-sphere is:

$A=\pi ^{1/3} (6. 1.25)^{2/3}=5.61cm^{2}$

The total area of the 8 1.25cm³-spheres is 8 × 5.61 cm² = 44.9 cm²

The ratio of 8 1.25cm³-sphere to 10.0 cm³-sphere is 44.9 cm²/22.4 cm² = 2.00

Since the surface area is doubled, the second run will be faster.

6 0

3 years ago

A 445N student eats 50g of Pringles. They feel guilty and decide to climb up some stairs to make up for it. How many flights of

krek1111 [17]

Answer:

808

Step-by-step explanation:

One serving of Original Pringles = 28 g = 150 Cal

Pringles ⟶ Cal 50 g × (150 Cal/28 g) = 268 Cal

Cal ⟶ J 268 Cal × (4184 J/1 Cal) = 1.121 × 10⁶ J

J ⟶ N·m 1.121 × 10⁶ J × (1 N·m/1 J) = 1.121 × 10⁶ N·m

N·m ⟶ m 1.126 × 10⁶ N·m/455N = 2460 m

m ⟶ km 2460 m × (1 km/1000 m) = 2.46 km

km ⟶ mi 2.46 km × (0.6214 mi/1 km) = 1.53 mi

mi ⟶ ft 1.53 mi ×(5280 ft/1 mi) = 8080 ft

ft ⟶ flights 8080 ft × (1 flight/10 ft) = 808 flights

The student would have to climb 808 flights of stairs to burn off the energy from 50 g of Pringles [that's equivalent to climbing the stairs in the Salesforce Tower (1070 ft) in San Francisco about 7½ times].

6 0

4 years ago

I have 0.445 L of a 1.8 M NaCl solution. If I boil away some water until the volume of the solution reaches 0.250 L, what will t

solmaris [256]

Answer:

3.2 M

Explanation:

M1V1=M2V2

1.8*.445=.801

.801/.25=3.204

Molarity = M2 = 3.2 M

3 0

3 years ago

A 53. 5 mL ample of an 5. 4 % (m / v) KBr olution i diluted with water o that the final volume i 205. 0 mL Expre your anwer to t

gogolik [260]

The concentration after dilution is 1.4%.

We are aware that concentration and volume are related to each other by the formula -

$C_{1}$ $V_{1}$ = $C_{2}$ $V_{2}$ , where we have initial concentration and volume on Left Hand Side and final concentration and volume on Right Hand Side.