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3 years ago

Search blue bottle experiment, read over the reaction, and explain why the colorless solution turns blue

Chemistry

1 answer:

katrin [286]3 years ago

4 0

Answer:

An alkaline solution of glucose acts as a reducing agent and reduces added methylene blue from a blue to a colourless form.

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A simplified version of the Periodic Table of the Elements is provided. What type of elements would you most likely find in the

vesna_86 [32]

Answer:

Transition elements are present in this region.

Explanation:

5 0

2 years ago

A 0.2121g sample of an organic compound was burned in a stream of oxygen and the carbon dioxide produced was collected in a stre

pav-90 [236]

Answer:

The answer to your question is: 17.26% of carbon

Explanation:

Data

CxHy = 0.2121 g

BaCO₃ = 0.6006 g

Molecular mass BaCO₃ = 137 + 12 + 48 = 197 g

Reaction

CO₂ + Ba(OH)₂ ⇒ BaCO₃ + H₂O

Process

1.- Find the amount of carbon in BaCO₃

197 g of BaCO₃ --------------- 12 g of Carbon

0.6006 g ---------------- x

x = (0.6006 x 12) / 197

x = 0.0366 g of carbon

2.- Calculate the percentage of carbon in the organic compound

0.2121 g of organic compound --------------- 100%

0.0366g -------------- x

x = (0.0366 x 100) / 0.2121

x = 17.26%

4 0

2 years ago

Iodine-131 is a beta emitter used as a tracer in radio immunoassays in biological systems. It follows first order kinetics. The

allsm [11]

<u>Answer:</u> The amount of Iodine-131 remain after 39 days is 0.278 grams

<u>Explanation:</u>

The equation used to calculate rate constant from given half life for first order kinetics:

$t_{1/2}=\frac{0.693}{k}$

where,

$t_{1/2}$ = half life of the reaction = 8.04 days

Putting values in above equation, we get:

$k=\frac{0.693}{8.04days}=0.0862days^{-1}$

Rate law expression for first order kinetics is given by the equation:

$k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}$

where,

k = rate constant = $0.0862days^{-1}$

t = time taken for decay process = 39 days

$[A_o]$ = initial amount of the sample = 8.0 grams

[A] = amount left after decay process = ?

Putting values in above equation, we get:

$0.0862=\frac{2.303}{39}\log\frac{8.0}{[A]}$

$[A]=0.278g$

Hence, the amount of Iodine-131 remain after 39 days is 0.278 grams

3 0

2 years ago

A car is traveling at a speed of 65 mi/h. How long does it take to cover a distance of 235 m?

fgiga [73]

Answer:

It will take 8.09 seconds to cover 235 meters by car with speed of 65 mile/h.

Explanation:

Speed of the car = 65 mile/h = 65 1609.34 m/h = 104,607.1 m/h

1 mile = 1609.34 m

Distance covered by the car in t time = 235 m = mile

$Speed-\frac{Distance}{Time}$

$104,607.1 m/h=\frac{\frac{235}{1609.34} mile}{t}$

$t=\frac{235 m}{104,607.1 m/h}$

t = 0.002246 h

1 hour = 3600 seconds

0.002246 h = 0.002246 h × 3600 seconds = 8.09 seconds

It will take 8.09 seconds to cover 235 meters by car with speed of 65 mile/h.

5 0

2 years ago

You have 0.5 L of air at a pressure of 203 kPa and -70 degrees C in a rigid, sealed container. What is the absolute temperature

horrorfan [7]

2) 273k is your answer. You're welcome.

7 0

3 years ago