Which structure is the Lewis structure for ammonia (NH3)?​

From the calculations, the heat of fusion of the substance is 0.73 kJ

The heat of freezing is the energy released when the substance is converted from liquid to solid.

Now we know that the molar mass of the substance is 82.9 g/mol  hence the number of moles of the substance is;  13.3 g /82.9 g/mol  = 0.16 moles

Now the heat of fusion shall be;

H = 4.60 kj/mol * 0.16 moles

H = 0.73 kJ

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The arrows that represent the phase transitions in which heat energy is gained is : (A). 1, 2 and 3

Phase transitions can be defined as the changing of matter from one form to another due to the addition or gaining of heat or due to the removal or loss of heat.

Phase transitions in matter are majorly between three phases which are: Solid, Liquid and Gas.

In conclusion, The arrows that represent the phase transitions in which heat energy is gained is : (A). 1, 2 and 3

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Answer:

ions need to be present in the water. If there are no ions in solution, no electricity is conducted. since, in water, electricity is conducted, this means that HCl completely ionizes to H + and C l − ions. However, in chloroform, since there is no conduction, HCl does not ionize and stays as the

Explanation:

An atom gains an electron from another atom. Hence, option B is the correct answer.

An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons.

When an atom shares electrons with another atom then it results in the formation of a covalent bond.

Whereas when an atom transfer electrons from one atom to another then it results in the formation of an ionic bond.

When the nucleus of an atom splits then it represents a nuclear fission reaction and energy is released during this process.

Hence, option B is the correct answer.

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The amount of oxygen in grams that reacted with 5.6 g of hydrogen to produce 41.4 g of water is 36.8 g

2H₂ + O₂ —> 2H₂O

Molar mass of O₂ = 32 g/mole

Mass of O₂ from the balanced equation = 1 × 32 = 32 g

Molar mass of H₂O = 18 g/mole

Mass of H₂O from the balanced equation = 2 × 18 = 36 g

SUMMARY

From the balanced equation above,

36 g of H₂O was produced from 32 g of O₂

NOTE: O₂ is the limiting reactant

From the balanced equation above,

36 g of H₂O was produced from 32 g of O₂

Therefore,

41.4 g of H₂O will be produced from = (41.4 × 32) / 36 = 36.8 g of O₂

Thus, 36.8 g of O₂ reacted to produce 41.4 g of H₂O

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Answer:

Antacids are medicines that counteract (neutralise) the acid in your stomach to relieve indigestion and heartburn. They come as a liquid or chewable tablets and can be bought from pharmacies and shops without a prescription.

Addition of pure water does not change pH of a solution because pure water has neutral pH.

Even though you continue to add pure water into a substance, the acidity or alkalinity of substance still remains the same to that of substance because pure water has neutral pH which can't change the acidity or alkalinity of a solution.

So we can conclude that addition of pure water does not change pH of a solution because pure water has neutral pH.

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The darkening of the atmosphere caused by meteorites would have reduced the sizes of some ecosystems due to less solar energy being available to plants.

This is the form of energy which is derived from the sun and is usually trapped by plants during photosynthesis.

Plants being primary producers will have less photosynthetic activity thereby leading to less food production and oxygen availability.

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Answer:

When the string on a violin vibrates, waves move in both directions along the string, interfering with each other. These waves are standing waves.

Explanation:

What are Standing Waves?

The Standing Waves are waves generated due to the vibrational frequency that produces reflected waves capable of interfering with the incident waves. 

Answer:

1.6 mol Carbon Dioxide

Explanation:

In order to convert between mols of compounds, you need to use the mole ratio. First, divide 2.5 moles of oxygen gas by 8 moles of oxygen because that is the number of moles of oxygen gas in the balanced equation. Then to find the number of moles of carbon dioxide, multiply by the 5 moles of carbon dioxide in the mole ratio. After multiplying, you get the answer 1.56 moles of carbon dioxide and with 2 significant figures present you would round to 1.6 moles.

The compound that releases hydroxide ions in an aqueous solution would be a base.

Bases are substances that when ionized in water, produce hydroxide ions as the only negative ion.

Bases are as opposed to acids. The latter produces hydrogen ions as the only positive ion when ionized in water. For example, sodium hydroxide ionizes in aqueous solutions as follows:

[tex]NaOH --- > Na^+ + OH^-[/tex]

Bases can also be defined as substances whose pH is above 7.

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Answer:

B- how much time it took a fossil to form

Explanation:

To determine the ages in years of Earth materials and the timing of geologic events such as exhumation and subduction, geologists utilize the process of radiometric decay.

Characteristic of Chemical Change: c. boil to a gas

1. Chemical changes involve the transformation of one substance into another substance with different properties.

2. Option c, "boil to a gas," is a characteristic of chemical change.

3. When a substance undergoes a chemical change, it may experience a change in its physical state, such as boiling, as a result of the chemical reactions occurring at the molecular level.

4. Boiling refers to the process in which a substance changes from a liquid state to a gaseous state, usually by the absorption of heat energy.

5. During a chemical change, the bonds between atoms or molecules in the substance are broken and rearranged, leading to the formation of new substances.

6. The change in state from a liquid to a gas indicates that a chemical reaction has taken place, resulting in the formation of different chemical compounds.

7. On the other hand, options a and b, turning cloudy and melting into a liquid state, are characteristics of physical changes rather than chemical changes.

8. Turning cloudy generally occurs due to the formation of suspended particles in a substance, while melting refers to the transition from a solid to a liquid state without the formation of new substances.

9. Option d, breaking into smaller pieces, can also be a characteristic of physical changes, such as when a solid is mechanically fragmented, without any alteration in its chemical composition.

10. Therefore, among the given options, the characteristic that specifically indicates a chemical change is c, boiling to a gas.

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Ionization energy is the periodic property of an element. The copper atom has the highest ionization energy among gold and silver atom.

Ionization energy is the amount of energy required for the removal of the loosely bounded electron from an atom. The ionization energy can be first, second, and third based on the number of electrons.

Ionization energy down the group decreases from top to bottom as the atomic radii of the element increase. So, the ionization energy for the given elements is Cu > Au > Ag.

Therefore, copper has the highest ionization energy.

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[tex]\text{Given that,}\\\\\text{Pressure,}~ P = 1.99~ \text{atm}\\ \\\text{No. of moles,}~ n = 0.182~ \text{mol.}\\\\\text{Temperature,}~ T = 83.4^{\circ}~ C = 356.4~K\\\\ \text{Molar gas constant,}~ R = 0.082~ \text{L}~ \text{atm}~ \text{mol}^{-1}~ \text{K}^{-1}\\\\\text{Volume,}~ V =?\\\\\text{We know that,}~\\\\~~~~~~~PV =nRT\\\\\implies V = \dfrac{nRT}{P}\\\\\\~~~~~~~~~~=\dfrac{0.182 \times0.082 \times 356.4 }{1.99}\\\\\\~~~~~~~~~~\approx 2.68~ \text{L.}\\\\\\[/tex]

[tex]\text{Hence the volume of the gas is 2.68 L.}[/tex]

2.68L is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4°C.

A measurement of three-dimensional space is volume. It is frequently expressed quantitatively using SI-derived units, as well as several imperial or US-standard units. Volume and the notion of length are connected. In contrast to how much space the container actually occupies, the size of a container is typically thought of as its capacity, or the quantity of liquid it could hold.

Volume was initially measured using naturally occurring vessels of a comparable shape and then with standardised containers. Arithmetic formulas can be used to quickly calculate the volume of several straightforward three-dimensional shapes. If a formula again for shape's boundary is known, it is possible to use integral calculus to determine the volumes of more complex shapes.

P×V = n×R×T  

V=n×R×T /P

=0.182 ×0.082×356.4 /1.99

=2.68L

Therefore, 2.68L is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4°C.

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Dow Chemical would be best described as a multinational corporation in this scenario.

This is the type of corporation which are involved in controlling production of goods and services in at least one country different from that of residence.

Dow chemical is known to have a plant in Germany and Russia thereby making it a multinational corporation.

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69 mmHg pressure is exerted by oxygen if 40% of the gas pressure is exerted by the oxygen gas.

Pressure is defined to be the amount of force exerted per area

40% of pressure is exerted by oxygen gas.

So, 60% of pressure will be exerted by carbon dioxide gas.

60% of 115 mmHg = 69 mmHg

Hence, 69 mmHg pressure is exerted by oxygen if 40% of the gas pressure is exerted by the oxygen gas.

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Answer:

J.J. Thomson

Explanation:

The empirical formula of the compound with the percent composition C 18.1%, H 2.27%, Cl 79.8% is C₂H₃Cl₃.

It is the minimum ratio between the elements that form a compound.

C: 18.1/12.01 = 1.51

H: 2.27/1.01 = 2.25

Cl: 79.8/35.45 = 2.25

C; 1.51/1.51 = 1

H: 2.25/1.51 ≈ 1.5

Cl: 2.25/1.51 ≈ 1.5

C: 1 × 2 = 2

H: 1.5 × 2 = 3

Cl: 1.5 × 2 = 3

The empirical formula is C₂H₃Cl₃.

The empirical formula of the compound with the percent composition C 18.1%, H 2.27%, Cl 79.8% is C₂H₃Cl₃.

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The solid would be caught on a filter paper or membrane while the liquid passes through.

Filtration is used to separate a mixture of insoluble substances in a liquid.

Since the aim is to separate the insoluble component of the mixture from the liquid, filtration using a suitable filter paper or membrane will be the way out.

The liquid will pass through the filter paper or the membrane while the insoluble component will be caught. This can then be dried and collected accordingly.

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Answer:

2,67 L

Explanation:

The volume of NaOH needed to neutralize 40. ml of 0.15 m Hcl acid is 12 mL.

The volume of base needed to neutralize 40. ml of 0.15 m Hcl acid is calculated as follows;

C1V1 = C2V2

V1 = (C2V2)/C1

V1 = (40 x 0.15)/(0.5)

V1 = 12 mL

Thus, the volume of NaOH needed to neutralize 40. ml of 0.15 m Hcl acid is 12 mL.

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Answer:

You need to provide a volume for the problem to be solved.

Explanation:

Based on the equation of the reaction, for every 1 mole of oxygen that reacts, 4 moles of electrons are transferred.

Redox reactions are reactions in which oxidation and reduction reactions occur simultaneously to the same extent.

Oxidation reactions involves addition of oxygen or removal of oxygen.

The equation of reaction when one mole of oxygen accept ectrons is given below:

[tex]O_2 + 4e^{-} \rightarrow 2O^{2-}[/tex]

Therefore, for every 1 mole of oxygen that reacts, 4 moles of electrons are transferred.

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The volume occupied by the sample is 8.4 cm³

The density is the ratio of mass of the object to its volume.

Given is the mass m =14.7 g and the density is 1.75 g/cm³, then the volume will be

ρ = m/ V

V =m /ρ

Substitute the values, we get

V = 14.7 /1.75

V = 8.4 cm³

Thus, the volume of the sample is  8.4 cm³.

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Answer:

Blood

Explanation:

'B'    stands for   'Blood'   in  Blood Alcohol Content

Answer:

• Reacting aqueous Sodium hydroxide solution with Magnesium chloride.

Explanation:

[tex]{ \rm{2NaOH _{(aq)} + MgCl _{2(s)} \: \dashrightarrow \: 2NaCl _{(s)} + Mg(OH)_{2(aq)} }}[/tex]

Answer:

Sodium hydroxide solution + Magnesium chloride = sodium chloride crystals

Explanation: