How many particles are in one mole of copper (II) sulfate, CuSO4?

A buffer can be prepared by mixing two solutions. Determine if each of the following mixtures will result in a buffer solution o

GenaCL600 [577]

Answer:

The answers are in the explanation

Explanation:

A buffer is the mixture of a weak acid with its conjugate base or vice versa. Thus:

1) Mixing 100.0 mL of 0.1 M HF with 100.0 mL of 0.05 M mol KF. Will result in a buffer because HF is a weak acid and KF is its conjugate base.

2) Mixing 100.0 mL of 0.1 M NH₃ with 100.0 mL of 0.1 M NH₄Br. Will not result in a buffer because NH₃ is a strong base.

3) Mixing 100.0 mL of 0.1 M HCN with 100.0 mL of 0.05 M KOH. Will result in a buffer because HCN is a weak acid and its reaction with KOH will produce CN⁻ that is its conjugate base.

4) Mixing 100.0 mL of 0.1 M HCl with 100.0 mL of 0.1 M KCl Will not result in a buffer because HCl is a strong acid.

5) Mixing 100.0 mL of 0.1 M HCN with 100.0 mL of 0.1 M KOH Will not result in a buffer because each HCN will react with KOH producing CN⁻, that means that you will have just CN⁻ (Conjugate base) without HCN (Weak acid).

I hope it helps!

6 0

3 years ago

Bomb calorimetry is a poor choice to determine the number of nutritional Calories in food; it consistently overestimates the Cal

maw [93]

Answer:

A) dietary fiber isn't used by the body.

Explanation:

The food we eat contains certain nutritional contents that provides energy, measured in calories (CAL) to the body. A procedure called BOMB CALORIMETRY can be used to determine the energy contents of these foods. The energy-supplying macromolecules contained in food substances we eat are carbohydrate, protein, fats etc.

Bomb calorimetry uses the method of burning the food substance in a device called bomb calorimeter, and measure the caloric content of the burnt food. Bomb calorimetry measures all the present calories in a food substance, which can include dietary fibers. Due to this reason, it is considered a poor choice in determining the number of nutritional calories in a food substance.

Dietary fibers are indigestible carbohydrates that cannot be broken down and used by the body. They pass along the alimentary canal until they are egested. Hence, they are no source of nutrients to the body. Since bomb calorimetry measures all calories including dietary fibers, it is said to overestimate the caloric content of food substances.

8 0

2 years ago

A scientist collects 0.24 mole of hydrogen gas in a balloon. The temperature of the hydrogen is 35°C, and the pressure in the ba

Delicious77 [7]

Answer:

24.082 liters

Explanation:

You can solve this question using ideal gas formula. There are a few factors that will determine the volume(V) of gas, the number of the gas molecules (n), pressure(P), and temperature(T). You also need coefficient (R) which will depend on the unit used in pressure. We will use R= 0,08206 L atm K-1 mol-1 here. Don't forget to change the Celcius temperature into Kelvin.

PV=nRT

V= nRT/P

V = 0.08206 L atm/Kmol * (35+273.15) K /1.05 atm

V= 24.082 L

5 0

3 years ago

1. Jack consumes two slices of pizza and drinks two large glasses of soda. Half an hour later, he complains of a stomachache. Wh

schepotkina [342]

Answer 1) Option D) Soda lowered the pH in his stomach and slowed digestive enzyme activity.

Explanation : Consuming soda after eating pizza lowered the pH of the stomach which consequently, slowed the digestive enzyme activity in the stomach. The enzymes actively digest the food only in highly acidic environment.

Answer 2) Option A) An inhibitor

Explanation : An inhibitor is a substance usually added to a progressing chemical reaction to decrease the rate of reaction and finally stop the reaction.

Answer 3) Option B) Presence of an enzyme

Explanation : When an enzyme is added to a chemical reaction it is often seen that it lowers the energy of activation and catalyzes the reaction. So, enzyme acts as a catalyst and increases the reaction rate.

Answer 4) Option A) The vitamins will bond to the enzymes and increase their reactivity with the substrates.

Explanation : When the biologists adds a vitamin solution to an enzyme or a substrate solution the bonding will take place between vitamins and enzymes and as a result it will increase the reactivity of the substrates.

Answer 5) Option C) The enzymes in the peaches have denatured.

Explanation : When enzymes are stewed or rather boiled they become denatured and the bonds between them breaks, which makes the enzyme useless. Hence, proteins should be eaten raw without boiling at higher temperatures.

Answer 6) Option A) The enzyme breaks the substrate apart to prepare for the reaction.

Explanation : In a catalytic reaction the enzymes usually break the substrate and create more surface area for the reaction to occur.

6 0

3 years ago

Read 2 more answers

Describe the classification of electromagnetic radiation.

Otrada [13]

Answer:

The EM spectrum

Explanation:

The EM spectrum is generally divided into seven regions, in order of decreasing wavelength and increasing energy and frequency. The common designations are: radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV), X-rays and gamma rays.

7 0

2 years ago