The reaction for the decomposition of ammonia can be written as shown below. If a student starts with 21.7 g of ammonia how many grams of hydrogen gas will be produced by the reactions?Why

2NH3 = N2 + 3H2

A. 1.28g
B. 2.55g
C. 3.85g
D. 32.5g

Final answer:

The vampire squid's lights are powered by bacteria called Vibrio fischeri.

Explanation:

The vampire squid possesses bioluminescent organs called photophores that enable it to produce light. These photophores are powered by bacteria called Vibrio fischeri which live symbiotically within the squid's light organs. The bacteria produce an enzyme called luciferase that acts on a substrate called luciferin, resulting in the emission of light.

Answer:

The number of mole is 0.04167mole

Explanation:

To convert gram to mole, we need to calculate the molecular weight of the compound

C6H12O6

C - 12

H - 1

O - 16

Molecular weight = 6 * 12 + 1 *12 + 6 * 16

= 72 + 12 + 96

= 180g/mol

To covert gram to mole

Therefore,

= 7.50g/ 180g/mol

= 0.04167 mole of glucose

Answer:

Sodium has 496KJ/mol ionization energy.

Explanation:

Ionization energy is the process in which electron which is present in the outermost shell is removed with the absorption of energy by the electron. Different atoms have different ionization energies. When we go from left to the right in the periodic table, ionization energy increases due to atomic size decrease. When we go from top to bottom in the periodic table, ionization energies decreases due to increase the atomic size. Sodium has 496KJ/mol ionization energy which means the outermost electron needs 496KJ/mol energy for removal.

Final answer:

Sodium, with atomic number 11, has 11 ionization energies, each corresponding to one of its 11 electrons. The first ionization energy involves removing the loosely held valence electron, resulting in the formation of a sodium ion (Na+). Each subsequent ionization energy is higher due to greater electrostatic attraction after each electron removal.

Explanation:

For an element such as sodium, the number of ionization energies corresponds to the number of electrons an atom has, which is 11 for sodium. Each removal of an electron from an atom requires more energy than the last due to the increased electrostatic attraction between the remaining electrons and the nucleus. This means for sodium there are 11 ionization energies, each removal corresponding to one of sodium's electrons - starting with the outermost electron, which is in the 3s orbital.

The first ionization energy is typically the smallest because it involves removing the most loosely held electron. As you proceed to remove more electrons, the ion becomes more positively charged and the remaining electrons are more strongly attracted to the nucleus. Hence, each successive ionization energy is greater than the previous one, often with a significant jump observed when starting to remove core electrons that are closer to the nucleus and more tightly bound.

The alkali metal sodium, with atomic number 11, has an electronic configuration of [Ne]3s¹. This 3s electron is the valence electron and is the easiest to remove. Once this electron is removed, sodium becomes a sodium ion (Na+) with a +1 charge.

The absolute pressure inside the ball is 1.25atm.

Explanation:

Given-

Volume, V = 5..27L

Temperature, T = 27°C

Gauge Pressure, Pg = 0.25 atm

Atmospheric pressure, Patm = 1 atm

Absolute pressure, Pabs = ?

We know,

[tex]Pabs = Pg + Patm\\\\\\Pabs = 0.25 + 1 atm\\\\Pabs = 1.25atm[/tex]

Therefore, absolute pressure inside the ball is 1.25atm.

Answer:

The absolute pressure inside the ball is 1.25 atmospheres.

The ball contains 0.267 mole of air.

Explanation:

im typing this to trick the algorithm but yeah that's right lol

Answer:

0.48L of NaOH

Explanation:

Data obtained from the question include:

Number of mole of NaOH = 0.725mol

Molarity of NaOH = 1.50M

Volume of NaOH =?

Molarity = mole /Volume

Volume = mole /Molarity

Volume = 0.725/1.5

Volume = 0.48L

Therefore, 0.48L of NaOH is needed for the reaction

Answer:

Choice A

Explanation:

Solvation describes the surrounding of solute ions by solvent molecules.

Final answer:

Solvation involves the intermolecular interactions of a solute with the surrounding solvent. In the case of ionic solutes, solvent molecules surround each ion and separate it from the rest of the solid. In the case of molecular solutes, each particle of the solute is surrounded by solvent particles, forming a solution. The correct option is A.

Explanation:

Chemically, a solvent will dissolve or "solvate" a solute. Solvation describes the intermolecular interactions of a molecule or ion in solution with the surrounding solvent. In the case of solvation in polar solvents, such as water, solvent molecules surround each ion of the ionic solute and separate it from the rest of the solid. This process is also referred to as hydration. On the other hand, in the case of solvation of a molecular solute like sucrose, each particle of the solute is surrounded by particles of the solvent, forming a solution.

Answer:

A measuring balance can be used to find the mass of a wooden block.

Mass can simply be defined as the amount of matter which is present in an object. The mass of wooden objects is measured with a measuring balance such as the triple beam balance.

The object to be measured is placed in the left side of the balance. Then the mass is leveled off.

Answer: Depending on the state of change it can be a physical change. Example: Evaporation is the physical change of a liquid turned into a gas.

That said, I'm pretty sure the answer is (True)

Note: Hope this is correct and it helps. Good luck :)

Answer:

12 is the length with accuracy and correct degree of precision.

Explanation:

Answer:

12 cm

That's your answer!!

Answer:

See the answer beloew, please.

Explanation:

The concepts of heat and temperature are related, but they are not the same. Temperature refers to a physical quantity which indicates the amount of heat. The latter corresponds to the energy that moves from one body to another, thus being able to raise or lower the temperature.

Final answer:

Heat refers to the transfer of thermal energy, measured in joules, while temperature measures the kinetic energy of particles, observed via a thermometer. Temperature influences chemistry by affecting states of matter and reaction rates.

Explanation:

Many often confuse heat with temperature, yet they refer to different aspects of thermal energy. Temperature is a measure of the average kinetic energy of the particles in a substance and is what we measure with a thermometer. On the other hand, heat is the transfer of thermal energy due to a temperature difference between objects. It is a form of energy flow from a warmer object to a cooler one and is measured in joules or calories. A high temperature might make us feel 'hot', but it is the flow of heat to or from our bodies that we truly sense.

Temperature plays a critical role in chemistry; it affects the state of matter and the rate of chemical reactions. For instance, when ice turns into water, it is because of an increase in temperature. Similarly, many chemical reactions speed up with higher temperatures, and keeping unstable materials like enzymes at lower temperatures can prolong their stability.

Answer:

density is defined as the ratio of mass to volume of a object

Answer:

The term density can be defined as the mass per unit volume of a substance.

Explanation:

The term density can be defined as the mass per unit volume of a substance.

The mathematical expression for density;

[tex]{Density P}=\frac{\text{Mass M}}{\text{Volume V}}[/tex]

The symbol for density is P, pronounced as "rho".

Also, the SI unit for measuring density is kg/m³.

The density of a material varies with temperature and pressure. This variation is typically small for solids and liquids but much greater for gases.

Answer:

24.42 J/K

Explanation:

i got it right

Answer:

d

Explanation:

Answer:

The answer is-2168kj/mol

Explanation:

Formula is product-reactant

Product is B2O3+3H2O

B2O3=-1274kj/mol

3H2O=3(-286)=-858kj/mol

Reactant is B2H6

B2H6=36kj/mol

Product-reactant=-858-1274-36

=-2168kj/mol

Answer:

first you subtract then you divide the equation an the you get your ansewe

Explanation:

Answer:

Nitrogen has an atomic number of 7

Explanation:

Answer:

14

Explanation:

nucleon number= number of protons+ number of neutrons

(0.48 gram) x (1mole / 4.0 gram) = 0.48/4.0 = 0.12 mole

Mole measure the number of elementary entities of a given substance that are present in a given sample. The mole of helium gas is 0.115 mole.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. Mole is inversely proportional to the molar mass of a substance and directly proportional to the given mass of that substance.

Mathematically,

mole of helium gas =given mass of helium ÷ molar mass of helium gas

Molar mass of helium=4 g/mol

Mass of helium =  0.46g

Substituting the values in above formula we get

Mole of helium gas  =  0.46g÷ 4 g/mol

Mole of helium gas  = 0.115 mole

Therefore, the mole of helium gas is 0.115 mole.

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Final answer:

In the transformation of electrical energy to sound and light by a television set, some energy is lost as heat due to the inefficiency of the device.

Explanation:

A television set changes electrical energy into sound and light energy. During this energy transformation process, some energy is usually lost as heat. This loss is primarily due to the inefficiency of electrical devices, where not all the incoming electrical energy is converted into the desired forms of energy.

The excess energy frequently dissipates as heat, which is released into the surroundings. This process aligns with the laws of thermodynamics, specifically the second law, which states that energy transformations are never 100% efficient.

Answer:

C,A

Explanation:

Answer:

c and a

Explanation:

Answer: m = 11.2 g C7H16

Explanation: First convert the mass of CO2 to moles. Then do the mole ratio between CO2 and C7H16 which is 7:1. Finally convert the moles of C7H16 to the mass of C7H16.

Solution attached.

The grams of heptane were burned is 88.8 grams .

The balanced reaction equation for the combustion of heptane, C7H16, is:

C7H16 + 11O2 → 7CO2 + 8H2O

To find out how many grams of heptane were burned, we can use the stoichiometry of the reaction. The molar ratio between heptane and CO2 is 1:7. So, we can set up a simple proportion to solve the problem.

Let 'x' be the mass of heptane:

(34.5g CO2) / (44.01g/mol CO2) = x / (114.22g/mol heptane)

Using this formula, we find that x = 88.8g. Therefore, 88.8 grams of heptane were burned.

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Answer:

In an endothermic reaction, products are higher than reactants in potential energy and  less stable

Explanation:

An endothermic reaction is a reaction that needs energy to happen. The energy needed from the endothermic reaction is taken from the system. In this reaction, the reactant will absorb the energy so they will make a product with higher energy.  

Since energy moves from a higher potential to lower potential, the product of the endothermic reaction is less stable.

97.22 grams of magnesium is needed.

Explanation:

The molar ratio of Mg to O2  to make MgO is 2:1

Here, we have 2 moles of O2, therefore we need 4 moles of Mg.

1 mol of Mg = 24.305 g

Therefore

4 moles of Mg = 4 [tex]\times[/tex] 24.305 g

                        = 97.22 g

Hence we need 97.22grams of magnesium are needed to completely reactwith 2.00 mol of O2 in the synthesis reaction that producesmagnesium oxide.

Answer:

well, through the process of cellular respiration, the energy in food is converted into energy that can be used by the body's cells. During cellular respiration, glucose and oxygen are converted into carbon dioxide and water, and the energy is transferred to ATP

Answer:

Oxygen is mixed with certain chemicals in a plant to make Carbon Dioxide and then the plant uses that to eat. So even if humans disappeared plants could still survive.

Explanation:

Answer: M = 2.08 M

Explanation: Molarity is expressed as the number of moles per unit volume in liters. First convert the mass of HCl to moles using its molar mass. Then substitute the variables to the formula for molarity.

75.00 g HCl x 1 mole HCl / 36 g HCl

= 2.08 moles HCl

For Molarity.

M = n / L

= 2.08 moles HCl / 1.000 L

= 2.08 M

The balanced equation is given as, 1 CS₂ + 3 O₂ → 1 CO₂ + 2 SO₂

Explanation:

CS₂ + O₂ → CO₂+ SO₂

Atoms       Before balancing          After balancing

                  LHS        RHS              LHS          RHS

C                 1               1                    1                1

S                  2              1                     2                2  

O                  2              4                    6                2+4=6

First we have to put 2 in front of SO₂, so the number of S atoms becomes equal on both sides, but the number of O- atoms gets increased as 6 on RHS, to balance that we have to put 3 infront of O₂, so that every atom on both sides of the equation gets balanced.

So the balanced equation is

1 CS₂ + 3 O₂ → 1 CO₂ + 2 SO₂

The correct answer is 50% of her eggs will carry the allele B, and the remaining 50% will carry the allele b.

If a woman has the genotype Bb for eye color, where B represents the dominant allele for brown eyes and b represents the recessive allele for blue eyes, each of her sex cells (eggs or ova) will have one of the two possible alleles, either B or b.

During the process of meiosis, which is the cell division that produces gametes (sex cells) in humans, the two alleles for a particular gene separate and end up in different gametes.

Specifically, in the case of this woman with the genotype Bb:

1. During meiosis, the homologous chromosomes carrying the alleles for eye color will separate, resulting in two different types of gametes (eggs).

2. Half of her eggs will contain the allele B (for brown eyes), and the other half will contain the allele b (for blue eyes).

Therefore, if a woman has the genotype Bb (brown eyes with the recessive allele for blue eyes), each of her sex cells (eggs) will have either the allele B or the allele b, but not both.

In other words, 50% of her eggs will carry the allele B, and the remaining 50% will carry the allele b.

This is known as the law of segregation, which states that during gamete formation, the two alleles for a particular gene separate, and each gamete receives only one of the two alleles.

Answer:

1. See explanation below

2. Density

3. Masses

Explanation:

1. Your picture is a bit too small to see the values but maybe this will help you.

To determine the maximum maximum mass in grams that triple beam balance can measure all you have to do is add up the maximum of each beam. So all you need to do is see the value at the last notch of each beam.

However, if you are referring to the picture that is attached in the bottom: The answer would be 610g. Because the last notches of each beam are as follows:

100 g

500 g

10 g

So we add that we get 610g.

2. density can be computed using the formula:

D = M/V

where:

D = density

M = mass

V = volume

As you can see in the both figures A and B measure 20 g, this means that their masses are the same. The density of objects can be different when either their masses, or their volumes are different. So even if they have the same mass, they can have different densities because they have different volumes.

3. Force of gravitational attraction between two objects is dependent on the masses of the two objects and the distance. The larger the mass, the stronger the gravitational force of attraction. This means that they have a direct relationship. Now when it comes to distance, the further apart they are the weaker the gravitational force of attraction, or in other words, they are indirectly related.

Answer:

0.67mol/Kg

Explanation:

The following were obtained from the question:

Mole of solute = 0.50mol

Mass of solvent = 750g = 750/1000 = 0.75Kg

Molality =?

Molality = mole of solute /mass of solvent

Molality = 0.5/0.75

Molality = 0.67mol/Kg

Answer:

B. The atoms of the reactants have combined to form a new substance.

Explanation:

When hydrogen and oxygen gas combined they form hydrogen peroxide. This is happen through chemical reaction so a new substance is formed. The state of reactant is also different, reactants are present in gaseous form while product is present in liquid form. So option b is correct.

Chemical change:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

These changes are irreversible

These changes occur due to chemical reactions

These may not be observed with naked eye

Example:

Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood

Boiling of egg: that change the chemical composition of protein in the egg .

The reaction of Hydrogen and oxygen:

H 2 (g)  + O 2  (g) -------------------------------------> H2O2  (l)

Explanation: The chemical reaction has combined the atoms of hydrogen gas and the atoms of oxygen gas to form a new substance. Since hydrogen peroxide is a different substance, it has different chemical and physical properties. All chemical reactions produce new substances with different chemical and physical properties than the reactants.

D

Make sure the results of the experiment are useful

Explanation:

In an experiment, certain variables (independent variables) are controlled to check how they affect other variables (dependent variables) and understand the relationship between them. Also, these experiments usually have a control experiment, of no change, to help compare results and increases their reliability.

Answer:

The amount of sample remain  after 48 years is 12.5 g.

Amount of sample decayed = 100 g- 12.5 g = 87.5 g

Explanation:

Given data:

Half life of Pu²⁴¹ = 14 years

Total amount of sample = 100 g

Sample remain after 42 years = ?

Sample decayed = ?

Solution:

First of all we will calculate the number of half lives.

Number of Half lives = T elapsed / half life

Number of Half lives = 42 years / 14 years

Number of Half lives = 3

At time zero = 100 g

At first half life = 100 g /2 = 50 g

At second half life = 50 g/2 = 25 g

At third half life = 25 g/ 2 = 12.5 g

So the amount of sample remain  after 48 years is 12.5 g.

Amount of sample decayed = 100 g- 12.5 g = 87.5 g