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3 years ago

Which action would reduce the activation energy of a chemical reaction?

Chemistry

1 answer:

zalisa [80]3 years ago

6 0

Answer: Option (A) is the correct answer.

Explanation:

A catalyst is a substance which helps in increasing the rate of a reaction without itself getting consumed in the reaction.

A catalyst lowers the activation energy of a reaction so that reactant molecules with less energy can easily participate into the chemical reaction and thus, product formation becomes faster.

Thus, we can conclude that adding a catalyst to the reaction would reduce the activation energy of a chemical reaction.

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A 1.450 g sample of an unknown organic compound , X, is dissolved in 15.0 g of toluene

muminat

Answer:

Molecular weight of the compound = 372.13 g/mol

Explanation:

Depression in freezing point is related with molality of the solution as:

$\Delta T_f = K_f \times m$

Where,

$\Delta T_f$ = Depression in freezing point

$K_f$ = Molal depression constant

m = Molality

$\Delta T_f = K_f \times m$

$1.33 = 5.12 \times m$

m = 0.26

Molality = $\frac{Moles\ of\ solute}{Mass\ of\ solvent\ in\ kg}$

Mass of solvent (toluene) = 15.0 g = 0.015 kg

$0.26 = \frac{Mole\ of\ compound}{0.015}$

Moles of compound = 0.015 × 0.26 = 0.00389 mol

$Mol = \frac{Mass\ in\ g}{Molecular\ weight}$

Mass of the compound = 1.450 g

$Molecular\ weight = \frac{Mass\ in\ g}{Moles}$

Molecular weight = $\frac{1.450}{0.00389} = 372.13\ g/mol$

4 0

3 years ago

What is the osmotic pressure of a solution made by dissolving 55.0 g of glucose, C6H12O6, in enough water to form 800.0 mL of so

Stels [109]

Answer:

The osmotic pressure is 8.85 atm

Explanation:

Step : Data given

Mass of glucose = 55.0 grams

Volume of water =800.0 mL

Temperature = 10.0 °C

Step 2: Calculate moles glucose

Moles glucose = mass glucose / molar mass glucose

Moles glucose = 55.0 grams / 180.156 g/mol

Moles glucose = 0.305 moles

Step 3: Calculate osmotic pressure

π = iMRT

⇒ with π = the osmotic pressure = TO BE DETERMINED

⇒ with i = the van't Hoff factor for glucose = 1

⇒ with M = the concentration = moles / volume = 0.305 moles / 0.800 L =0.381 M

⇒ with R = the gas constant = 0.08206 L*atm*mol¨K

⇒ with T = the temperature = 10.0 °C = 283 K

π = 1* 0.381 *0.08206 * 283

π = 8.85 atm

The osmotic pressure is 8.85 atm

3 0

3 years ago

A consequence of "yo-yo dieting is that A. cholesterol levels will increase. B. A person will develop allergies to certain foods

Tju [1.3M]

the correct option is C.

Weight cycling refers to the repeated process of loosing and gaining weight. When weight cycling is caused by dieting it is called yo-yo dieting. Yo-yo dieting has many potential negative effects and one of them is increases in body fat percentage. Other negative consequences include: diabetes, fatty liver, high blood pressure, etc.

5 0

3 years ago

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Vinil7 [7]

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3 years ago

A process in which one or more substances change to make one or more new substances is called a

svetlana [45]

The answer to your question is: Chemical Reaction.

8 0

3 years ago