A compound is composed of carbon and hydrogen and has an empirical
formula of CH. The molar mass of the compound is experimentally
determined to be 78.12 g/mol. What is the molecular formula for the
compound?

The properties of the elements are repeated after 2 8 18 and 32 elements because these are the maximum number of the electrons that the four shells contains.

The electronic configuration of the elements in the periodic table are repeated because the maximum number of the electrons that the four shells can have are 2 8 18 and 32. the name of the four shells are K , L, M, N. The electronic configuration of the elements are repeated and due to this the properties of the elements are repeated.

Thus, the properties of the elements are increases because the electronic configuration are repeated in the periodic table.

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If the molecular weight is 230.26 g/mol carbon = 73.03% = 230.26*73.03/100 = 168.15/12 = 14 Carbons Hydrogen = 6.13% = 230.26*6.13/100 = 14/1 = 14 Hydrogens Oxigen = 20.84% = 230.26*20.84/100 = 47.98/16 = 3 Oxygens Hence the empirical formula is C14H14O3

The International System for Units (SI) defines the newton as the unit of force, which is used to measure weight. For instance, a kilogram of matter weighs around 9.8 newtons on Earth's surface and around each as much on Moon.

Weight, which is expressed in newtons, is a unit of measurement for the gravitational force acting on an object. The mass of a bird with a mass of 15 g changes with the strength of the gravity influence acting on it, and would differ significantly if it were measured, for instance, on the Moon rather than on Earth.

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Answer: The new temperature is 4768 K.

Explanation:

Given: [tex]T_{1}[/tex] = 298 K,    [tex]V_{1}[/tex] = V,        [tex]P_{1}[/tex] = P

[tex]T_{2}[/tex] = ?,           [tex]V_{2}[/tex] = 4V,           [tex]P_{2}[/tex] = 4P

Using the combined gas law formula as follows.

[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}[/tex]

Substitute the values into above formula as follows.

[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}\\\frac{P \times V}{298 K} = \frac{4P \times 4V}{T_{2}}\\T_{2} = 4768 K[/tex]

Thus, we can conclude that the new temperature is 4768 K.

Answer:

10 g

Explanation:

All we need is to read off the solubility curve attached to this answer. The solubility curve is a plot of solubility of a solute against temperature.

By reading off the solubility curve, we can know the mass of precipitate that crystallizes out as the solution is cooled from 50°C to 30°C.

From the solubility curve;

Mass of Ammonium Chloride  dissolved at 50°C = 50 g

Mass of Ammonium Chloride  dissolve at 30°C = 40 g

Hence;

Mass of precipitate formed = 50 g - 40 g

Mass of precipitate formed = 10 g

She changed the mask chemically. Burning of the substance with acid is a chemical change.

A new substance with new qualities is created during burning, which is a chemical alteration that cannot be undone. A chemical change is the transformation of one substance into another, the emergence of new compounds with distinct properties, or any combination of these. It happens when two substances mix to create a new material. Baking soda and vinegar producing carbon dioxide, iron rusting, and wood burning are a few examples of chemical changes. The metabolization of food and the production of amylase from the combining of sugar and saliva are only two examples of the many chemical processes that the body produces.

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Using the law of the conservation of mass, the reactions can be shown to obey the law.

We need to know what the law of the conservation of mass says so that we can be able to know how we can be able to apply the law in the proper perspective. We have to know that the law says that total mass of the system would remain constant. The implication of this is that the mass before the reaction would be the same as the mass after the reaction. The mass of the substance must be able to add up in the system that is under study as we have one here.

Mass of the iron = 56 g

Mass of the chlorine = 35.5 g

Balanced reaction equation;

[tex]2Fe + 3Cl_{2} ---- > 2FeCl_{3}[/tex]

This is the  formation of the iron III chloride

Total mass on the right hand side = 2(56) + 6(35.5) = 325 g

Total mass on the left hand side = 2[56 + 3(35.5)] = 325 g

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The product could have been lost if this experiment was conducted in a physical laboratory: Human Error, Incomplete Reaction, Inadequate Stirring, Impurities and Loss of Product.

Product is a tangible or intangible good that is produced for sale on the market.

1. Human Error: Inaccurate measurements or miscalculations during the experiment may have caused the percent yield not to be 100%.
2. Incomplete Reaction: Depending on the reaction conditions, it is possible that the reaction did not go to completion, leading to a lower percent yield than expected.
3. Inadequate Stirring: If the reactants were not adequately mixed during the experiment, some reactants may not have been able to properly react, resulting in a lower percent yield.
4. Impurities: If the reactants used in the experiment were impure, it could lead to a lower percent yield due to the presence of undesirable substances that can interfere with the reaction or are not involved in the reaction.
5. Loss of Product: If the experiment was conducted in a physical laboratory, it is possible that some of the product was lost during the experiment due to improper handling or other factors.

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'The temperature of the reaction mixture increases'  would be evidence that a chemical reaction took place.

What is a dilute solution?

A dilute solution is a solution that contains fewer solute particles than a more concentrated solution. Dilute solutions are generally less concentrated than more concentrated solutions and are often made by adding more solvent to the solution.

When a chemical reaction takes place, energy is released in the form of heat. This increase in temperature is basically known as an exothermic reaction. An increase in temperature is a sign that a chemical reaction has taken place, as the reaction mixture is absorbing the energy released from the reaction.

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Answer:

mass of alloy=165.36g

volume of alloy=21.2ml

density of alloy=7.8g/ml

Answer:

a compound with one carbon atom and four hydrogen atoms (CH4).

Explanation:

Natural gas is a fossil energy source that formed deep beneath the earth's surface. Natural gas contains many different compounds. The largest component of natural gas is methane.

Zinc, phosphorus and oxygen are elements contained in dental cement (Zn₃(PO₄)).

Dental cements have a wide range of dental and orthodontic applications. Common uses include temporary tooth restoration, lining cavities to protect the pulp, sedation or isolation, and cementation of fixed prosthetic devices.

A cement-retained bridge is simply a dental device that is permanently fixed in the mouth to restore the mouse's function and aesthetics and to prevent many of the consequences of tooth loss that affect the immediate aftermath of losing natural teeth.

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To solve this we must be knowing each and every concept related to isomer. Therefore, two  geometric isomers are possible for the complex [CrF[tex]_3[/tex]Br[tex]_3[/tex]]₃⁻.

An isomer is a chemical substance that has the same number and kinds of atoms like another chemical species that differs from it in terms of attributes due to the way the atoms are organized.

Stereoisomerism includes geometric isomerism. It is sometimes referred to as E-Z isomerism or cis-trans isomerism. Geometric isomerism is caused by cyclic compounds' constrained rotation around carbon-carbon double or single bonds.  The complex [CrF[tex]_3[/tex]Br[tex]_3[/tex]]₃⁻ has two  geometric isomers, one is facial and other is meridional.

Therefore, two  geometric isomers are possible for the complex [CrF[tex]_3[/tex]Br[tex]_3[/tex]]₃⁻.

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Answer:

The next step is prototype testing

Explanation:

The stages of the design process are;

1) Situation analysis

Paper based research is conducted on the situation to obtain the situation parameters

2) Brief writing

With the situation analysis developed above, the brief of the current situation is put down on paper

3) Problem research

The problem is researched and experimented on with the development of a paper based proof of the possible concept

4) Specification writing

The specifications of the problem are outlined

5) List the possible solutions

The possible solutions are brainstormed and listed

6) Preferred solution selection

The preferred solution is selected based on the constraints in the situation

7) Create working drawing/plan

The working design drawing of the selected solution or concept is completed and evaluated for applicability

8) Building of a prototype

The design is converted into a prototype which is a model of the actual solution

9) Testing of the prototype

The prototype is tested for functionality, for ability to work in the intended situation and/or in the intended system

10) Report writing

A report is made on the outcome of the tests for review before production

Therefore, after the prototype is created, stage 8, the next step is the testing of the prototype stage 9.

The volume of 0.145 M NaOH is required to reach the equivalence point in the titration of 45.0 mL of 0.105 M HNO₃ is 32.58 mL.

Given that :

the molarity of the HNO₃ , M1 = 0.105 M

the volume of the HNO₃ , V1 = 45 mL

the molarity of the NaOH , M2 = 0.145 M

the volume the NaOH , V2 = ?

by using the equation given below , we get:

M1 V1 = M2 V2

0.105 × 45 = 0.145 × V2

V2 = 4.725 / 0.145

V2 = 32.58 mL

Thus volume of the NaOH is 32.58 mL.

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Oxidation of methane to soot:

CH4(g)+O2(g)⟶C(s)+2H2O(g)

Among the hydrocarbons is methane, CH4(g). Only the elements carbon (C) and hydrogen (H) are present in the complex. When methane burns with too much oxygen, it produces water vapor and carbon dioxide gas CO2(g) (g). Complete combustion is defined as combustion with extra oxygen.

Methane can be partially oxidized into a variety of compounds when it is burned inefficiently, including CO, methanol, formic acid, formaldehyde, and higher hydrocarbons.

Carbon monoxide is an extremely toxic gas. It is invisible and odorless. Without anybody being aware of it, malfunctioning gas fireplaces or boilers can poison the air in a room by emitting carbon monoxide.

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The complete question is

Problems that can be caused by both the complete and incomplete

combustion of methane in a gas fire.

Answer:

Precautions must be taken to remove all possibilities of fire or explosion.

Explanation:

Since Hydrogen is a very flamable or combustible gas, it is neccesary to avoid smoking, remove sourcs of sparks, flames or heat and hydrogen should be used in a well ventilated area.

Answer:

The generation and use of hydrogen is dangerous.  Mixtures of hydrogen and air can be highly explosive.  Never smoke near a place where hydrogen is generated or being used.  Remove all possible sources of flame and sparks.  Hydrogen should only be generated and used in a well ventilated out door area.   Precautions must be taken to remove all possibilities of fire or explosion.

The first few bubbles of hydrogen gas should not be collected since they contain air mixed with the gas. Air mixed with hydrogen forms an explosive mixture.

A flame should not be brought near the apparatus since hydrogen is inflammable.

The original pressure was 1000 mmHg.

Pressure is a force applied to a surface or object over a given area. Pressure can be generated in a variety of ways, including through mechanical force, electrical force, or through changes in temperature or chemical reactions. Pressure can be measured using a variety of devices, including a barometer, manometer, or gauge. Pressure is an important concept in many fields such as physics, engineering, chemistry, and medicine. It can be used to measure the force of a liquid or gas, the pressure of a liquid or gas, or the pressure at a certain depth in the ocean.

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The major organic product of this reaction is 2-bromobutane, a saturated hydrocarbon with a bromine atom attached to the second carbon atom.

The major organic product is 2-bromobutane.

Structure:

CH3 CH2 CH2 CH2 Br

    |   |   |

    CH3 CH2 Br

1) The reaction begins with bromine reacting with the 2-methylpropane molecule to form the intermediate 2-bromo-2-methylpropane.

2) The intermediate then reacts with hydroxide ions to form the final product, 2-bromobutane.

3) The final product is a saturated hydrocarbon with a bromine atom attached to the second carbon atom.

The major organic product of this reaction is 2-bromobutane, a saturated hydrocarbon with a bromine atom attached to the second carbon atom.

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The importance of the carbon dioxide, CO₂ and the oxygen O₂ in the water is they both are important for the aquatic animals and for the aquatic plant.

The CO₂ and O₂ are both important for the aquatic animals and also for the aquatic plants. the concentration of the oxygen in to the water is important for the aquatic animals that the dissolved oxygen for the respiration. the carbon dioxide will be more soluble in water than the oxygen in the water.

The carbon dioxide forms the carbonic acid in the water. the carbon dioxide is useful for the aquatic plants for the growth.

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Answer:

0,5 moles

Explanation:

N = L × n

n = N ÷ L

n = 2,87 × 10²³ ÷ 6,02 × 10²³

n = 2,87 ÷ 6,02

n = 0,47 moles or 0,5 moles

Explanation:

mass number = sum of protons and neutrons

= 87 + 136

= 223

chemical symbol = Fr

ion charge = +1 (because it has one more proton than electron)

atomic mass number = sum of protons and neutrons

= 87 + 136

= 223

chemical symbol = Fr, ion charge = +1 (because it has one more proton than electron)

Atoms are the basic and smaller units of elements which cannot be broken down further chemically, atoms and elements are organized and represented onto a display called the periodic table.

Atoms are composed of protons, neutrons, and electrons, where protons and neutrons present at the nucleus center of the atom where as electron surrounds the nucleus.

The center of the atom makes up most of the mass of the atom as this is made up of protons and neutrons. Protons are positively charged particle  and neutrons  have neutral charge, respectively, and each are have a mass of 1 atomic mass unit (amu).

Electrons are negatively charged particle and Amu's are units of measurement for atomic mass, proton and neutron are both equal to 1 amu.

Atomic mass units are based on the masses of protons and neutrons band one carbon atom has only six protons and usually six neutrons in the nucleus.

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Answer:

When ice or any other solid melts, its potential energy increases. Indeed, this is the only increase in energy, since the thermal kinetic energy, or temperature, does not increase while melting. Potential energy is the latent energy that could be released by the water, and this increases because the water will release heat energy if it is frozen solid again.

Ice is the lowest energy state of water at normal Earth pressures. At each phase change of water, whether ice to liquid water or liquid water to water vapor, the potential energy decreases. This is due to the Law of Conservation of Energy. Materials undergoing a change of state absorb or release heat energy, but their temperatures do not change. This is because, while the state change is occurring, all the heat energy is converted into the potential energy of the new state of matter.

Water, in particular, has a very large change in potential energy during phase changes. It takes a great deal of energy to change water from one state to another. This is because of the strong hydrogen bonds that form between water molecules. The liquid phase allows water molecules to be in contact with each other, while the solid phase puts water molecules in an overall optimal configuration relative to each other.

Explanation:

Answer:

it turns into icecream

Answer:

velma is recommending the stronger soloution

Explanation:

because firstly velmas solution is more concentrated and the pH level of her solution is more Alkaline than shaggies solution

Answer:

Media C

Explanation:

We know that ratio of sine of angle of incidence to the sine of refraction gives refractive index. Increases in refractive index increases the range of bending. Here angle of incidence is same in every case. The angle of refraction is greater in c. It has less refractive index and hence, light suffer less bending, which increases its speed.

The kind of molecular motion that mostly relates to temperature of a substance is : A) translational motion.

Motion in which all the points of a moving body moves uniformly in the same direction. If object is undergoing translatory motion, we can see that there is no change in the orientation of object. Translatory motion is also called translational motion.

In kinetic theory of gasses, increasing the temperature of a gas increases the average kinetic energy of the molecules, causing an increased motion. This increased motion increases outward pressure of the gas, which an expected result from the ideal gas equation (PV=NkT).

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Answer:

I am not sure you would have to screenshot ur page

Answer:

look for evidence that the molecules are chiral.

Explanation:

The instrument with which optically active compounds are studied is a polarimeter, shown in the figure below. Imagine a horizontal line that passes through the zero of a coordinate system.