952 grams of ammonium carbonate are dissolved to make 1750 mL of solution

Answers

Answer 1

Answer: (%m/v) =mass of solute (in g) / volume of solution (in mL) x 100

= 952 g (NH4)2CO3 / 1750 mL x 100

= 0.544 x 100

(%m/v) = 54.4 g /mL or 54.4% concentration of ammonium carbonate
solution

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Which molecule is a source of energy, a store of energy, and can mix with water?
2Mg + O2 --> 2MgO Magnesium is the oxidizing agent and is reduced oxidizing agent and is oxidized reducing agent and is reduced reducing agent and is oxidized
Which substance is a molecule?A. water B. sodium C. salt water D. sand and salt
Mark's uncle is about to have a procedure to treat his prostate cancer. The treatment involves placement of smallpellets close to the tumor to deliver a localized dose of radiation. What type of nuclear therapy is this?a. external beam radiationb. brachytherapyc. radiopharmaceuticalsd. internal X-rays

23 Which term identifies the half-reaction that occurs at the anode of an operating electrochemical cell?(1) oxidation (3) neutralization
(2) reduction (4) transmutation

Answers

Answer: The correct answer is Option 1.

Explanation:

Electrochemical cell is defined as the device that is used for the conversion of the chemical energy produced in a redox reaction into the electrical energy. In this cell, oxidation reaction occurs at anode and reduction reaction occurs at cathode.

For the given options:

Option 1: Oxidation reaction

Oxidation reaction is defined as the chemical reaction where a substance looses its electrons. The oxidation state of this substance gets increased and the substance gets oxidized.

$X\rightarrow X^(n+)+ne^-$

Option 2: Reduction reaction

Reduction reaction is defined as the chemical reaction where a substance gains electrons. The oxidation state of this substance gets reduced and the substance gets reduced.

$X^(n+)+ne^-\rightarrow X$

Option 3: Neutralization reaction

Neutralization reaction is defined as the chemical reaction where an acid reacts with a base to produce a salt and water molecule.

$HX+BOH\rightarrow BX+H_2O$

Option 4: Transmutation

This is defined as the process in which a nucleus is converted to another nucleus.

From the above information, at anode, oxidation reaction occurs. Thus, the correct answer is option 1.

Which pair will react with each other?sodium bromide and chlorine
sodium bromide and iodine
sodium chloride and bromine
sodium chloride and iodine

Answers

Sodium bromide and iodine

It has been determined that the body can generate 5500 kJ of energy during one hour of strenuous exercise. Perspiration is the body’s mechanism for eliminating this heat. What mass of water would have to be evaporated through perspiration to rid the body of the heat generated during 2 hours of exercise? (The heat of vaporization of water is 40.6 kJ/mol.)

Answers

Answer:

4.88 kg

Explanation:

Amount of energy generated in 1 hour of exercise = 5500 kJ

Thus,

Amount of energy generated in 2 hours of exercise = 5500*2 kJ

So,

Amount of energy generated in 2 hours of exercise = 11000 kJ

Heat of vaporization of water = 40.6 kJ/mol

40.6 kJ of energy is required to vaporize 1 mole of water

Also,

11000 kJ of energy is required to vaporize (1/40.6) * 11000 mole of water

Moles of water = 270.936 moles

Molar mass of water = 18 g/mol

Mass = Moles * Molar mass = 270.936 * 18 g = 4876.8473 g

Also,

1 g = 0.001 kg

So, mass of water = 4.88 kg

Fill the 25-ml graduated cylinder with 11.5 mL
of water, what’s the volume?

Answers

Answer:

The volume of the water is 11.5 ml

Explanation:

Volume refers to the space occupied by a fluid.

Usually, a graduated cylinder is used to measure the volume of a fliud. Hence, the volume of the fluid as measured by the graduated cylinder in this case is 11.5 no.

Explain why hydrogen and oxygen are considered elements whereas water is not considered an element.

Answers

Elements are the simplest building blocks you can break matter down into using purely chemical methods. They are a pure substance made up from only one type of atom.

When you mix elements together these form compounds. The important difference is that as they are a mixture of more than one type of element, they CAN be broken down into more simple substances using chemical means!

As such Hydrogen or Oxygen cannot be simplified chemically (they are therefore elements), however dihydrogen monoxide (H2O or water) is a mixture of these elements that can be broken down using chemical means and so is a compound.

Water is a type of compound . when two elements combine with each other ( hydrogen &oxygen) they forms a compound

Which term describes the point when two objects reach the same temperature and there is no longer a transfer of energy through heat?1. Latent Heat
2.specific Heat
3.thermal equilibrium
4.Heat of Fusion

Answers

Answer: Option (3) is the correct answer.

Explanation:

When two substances or objects at the same temperature do not exchange heat with each other then this state is known as thermal equilibrium.

Whereas latent heat is the release or absorption of energy at a constant temperature.

Specific heat is the amount of heat per unit mass necessary to increase the temperature by one degree Celsius.

Heat of fusion is the amount of energy required to change the state of matter or substance.

Thus, we can conclude that out of the given options, thermal equilibrium describes the point when two objects reach the same temperature and there is no longer a transfer of energy through heat.

C. Thermal Equilibrium

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Describe the structure of the water molecule and indicate how this structure is responsible for many of the unique properties of this vital compound.

The atom in a sample of an element must contain nuclei with the same number of?