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The two factors which must be held constant for density to be a constant ratio are: Mass and Volume

As we know, the density of a material is simply defined as the ratio of mass to volume.

Consequently, To obtain a constant ratio for density, the mass and volume of the material in discuss must be kept constant.

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Answer:

2 and 3 is the answer because Methane is emitted from a variety of anthropogenic (human-influenced) and natural sources. Anthropogenic emission sources include landfills, oil and natural gas systems, agricultural activities, coal mining, stationary and mobile combustion, wastewater treatment, and certain industrial processes

Answer:

D

Explanation:

Valence electrons are the electrons in the highest occupied principal energy level of an atom.

Answer:

to create oxygen and energy in the form of sugar

Explanation:

photosynthesis is the process by which plants use sunlight, water, and carbon dioxide

Answer:

12 atoms of carbon

Explanation:

(6.023X10^23)/12 atoms of Carbon.

There are 0.42 moles of carbon atoms in 5g of carbon.

no. of moles = mass (g) ÷ molar mass (g/mol)

No. of moles = 5g ÷ 12g/mol

No. of moles = 0.42moles

Therefore, there are 0.42 moles of carbon atoms in 5g of carbon.

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Answer:

How is the bond between carbon and hydrogen in methane DIFFERENT from the bond

Explanation:

Elements of the periodic table are arranged in order of increasing atomic number. The periodic law states “When elements are arranged in order of increasing atomic number, there is a periodic repetition of their chemical and physical properties.”

Answer:

11: 4

12: 3

13: 1

17: 3.000060

18: 5.0 x 10^2

19: 5.0 x 10^6

Explanation:

11: digits between 1&9 are always signifigant even if there are zeros between them

13: Zeros after the decimal do not count unless they represent an exact measurement

18: The decimal point moves forward 2 units so 10^2

When a substance is soluble it can dissolve only a specific amount into the liquid, determined by its solubility. Hence, option B is correct.

A solute is something being dissolved, a solvent is a thing dissolving the item, and the solution is the mixture of the two items.

Solubility is a term used to describe how readily a substance can be dissolved in a solvent to form a solution. Thus, a substance is said to be soluble if it dissolves completely in a solvent and insoluble if it doesn't dissolve or only dissolves partially.

Hence, when a substance is soluble it can dissolve only a specific amount into the liquid, determined by its solubility.

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Elements in the same group have the same number of outermost electrons.

Electronic structure refers to the arrangement of electrons in the atom. We know that elements in the same group have the same number of outermost electrons.

However, as we come down the group, the inner shells of the elements in group 14 become bigger and the outermost shells are now found at higher energy levels such as n=4 or 5.

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Water

Milk

Juice

Hot choclate

Answer: The answer is B). Hot Chocolate, Juice, Milk, Water.

Explanation: For the second row, I put the temperature (in °C) in the descending order that looks like this: 50°C, 40°C, 35°C, 15°C.

I hope that my answer is very helpful to your own question about listing these drinks in descending order by starting with the drink whose particles have the highest kinetic energy, please mark me as Brainliest and have a great P.A. Day and weekend! :D

Sincerely,

Jason Ta,

The ambitious of Brainly and the role of The TDSB and WHCI Student of the high school.

Answer:

Plant cells have a cell wall and chloroplasts; animal cells do not have either of these structures.

Explanation:

A major difference between a plant cell and an animal cell is presence of chloroplasts in plant cells. Another key difference between plant and animal cells is the presence of a cell wall in plant cells. Both structures are absent in an animal cells.

The cell wall surrounds the plasma membrane of plant cells. This helps to provide the required tensile strength and protection against mechanical and osmotic stress.

Cell walls also help plants to maintain shape and rigidity.

Answer:

1) Plant cells have a cell wall to strengthen the cell

2) Chloroplasts are the site of photosynthesis (turning light energy in sugar) so there would eb a lot more in the leaves that get sunlight than the roots which are underground and receive no sunlight

3) Mitochondria and nucleus

4) No. Some microorganisms are useful to humans, such as the bacteria that create yoghurt, or fungi such as penicillin which are antibiotics, which help us fight bacterial infections

Dietary protein will not be digested if Hcl were not being produced in sufficient quantities.

In the stomach, there are some glands found on the stomach lining that helps to release hydrochloric acid (HCl). Their major role is to dissolve food and produce an acidic medium.

The acidic media promotes and improves the conversion of pepsinogen to pepsin. Pepsin acts as an enzyme that supports protein digestion.

Protein digestion requires a pH of around 1.8 which can be achieved by the secretion of HCl.

As a result, if HCI is not released in the stomach in sufficient quantities, pepsin will not be activated and it would have a detrimental impact on protein digestion.

Therefore, we can conclude that dietary protein will not be digested if Hcl were not being produced in sufficient quantities.

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Answer:

They are just two....Ca and OH

Answer:

The particle theory of matter is a model that describes the arrangement and movement of particles in a substance. The model is used to explain the physical properties of solids, liquids and gases. Particle arrangement and movement

Explanation:

Answer:

yes

Explanation:

Answer:

Mostly Kinetic

Explanation:

Answer:

a change in the level of consumer income

Explanation:

Mashing two marshmallows together can be an appropriate model to explain nuclear fusion.

Nuclear fusion is the reaction that occurs when two or more light elements combine to form heavier elements with the release of energy.

Nuclear fusion reactions occur mainly in the production of stars and the main-sequence star, The Sun by the fusion of hydrogen nuclei into helium.

Therefore,The following  cannot be a model of Nuclear fusion, because they do not follow the basic concept of nuclear fusion which two light nuclei react to form a single heavy nuclei.

Marshing two marshmallows together can be a good model to explain nuclear fusion because it follows the basic concept of nuclear fusion

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Answer:

mashing two marshmallows together

Explanation:

i've taken the test

A thermos slows down the process of heat transfer as it minimizes the process of conduction and convection.

Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.

In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules ,

When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:

1) heat conduction

2) electrical conduction

3)sound conduction

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We can check if the equation is balanced by comparing the number of atoms of each element on the reactant and product sides. The reaction is only balanced if the number of atoms of each element is equal.

       S  +  3O₂ → SO₃

    Reactant       Product

S        1                    1

O       6                   3

The balanced equation would be  2 S + 3O₂ → 2SO₃

                                                          Reactant       Product

                                                     S         2                   2

                                                     O        6                    6

Answer:

In order to obtain eight valence electrons (an octet), the potassium atom will transfer its single valence electron to the fluorine atom.

Answer:

The two main variables in an experiment are the independent and dependent variable. An independent variable is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable. A dependent variable is the variable being tested and measured in a scientific experiment.

Explanation:

Hope this helps...

Answer:

to obtain a full outer shell

Explanation:

The atoms of some elements share electrons because this gives them a full valence shell. ... If atoms can't achieve a full outer shell by transferring electrons, they resort to sharing. In this way, each atom can count the shared electrons as part of its own valence shell. This sharing of electrons is covalent bonding.

Atoms generally exchange or share electrons during bonding because they want to obtain a full outer electron shell. Thus, the correct option for this question is A.

Chemical bonding may be defined as a type of interaction that is significantly accomplished through the association of atoms into molecules, ions, crystals, and other stable species that make up familiar substances.

According to the context of this question, the atoms of some elements typically transfer their electrons to the other elements in order to achieve a fully filled outermost shell.

If they do not have a tendency of transferring, they follow a different mechanism of sharing their electrons. The sharing of electrons gives rise to the formation of covalent bonding.

Therefore, atoms generally exchange or share electrons during bonding because they want to obtain a full outer electron shell. Thus, the correct option for this question is A.

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Selectivity is relatively easy to alter, with mobile phase composition and stationary phase being the primary means of adjustment. The hydrophobicity, polarity and nature of the chosen stationary phase all play a crucial role in analyte interaction and directly affect the selectivity of a separation.

In chromatography, it is important to select a good stationary phase so as to ensure proper separation of components.

Chromatography is a separation technique which is generally used for separating substances based on their solubilities. The technique makes use of two phases the mobile phase and the stationary phase.

The components are separated from each other based on their solubility in the mobile phase. Component which is least soluble does not travel along the mobile phase while component which is highly soluble travels with the mobile phase.

The difference in the solubility of the components is measured with the reference to the solvent front and is expressed in terms of Rf value.Chromatography finds application in forensics, separation of organic compounds,etc.

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Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 992 g

volume = 1000 mL

We have

[tex]density = \frac{992}{1000} \\ = 0.992[/tex]

We have the final answer as

Hope this helps you

Answer:

The filter flask and the vacuum trap consist of heavy-walled glassware. You should use thick-walled tubings as well. Normal tubing that you use as water hoses will collapse under vacuum.

For vacuum filtration, thick walled tubings are best as they can withstand the pressure which is applied during filtration.

It is a filtration technique which works faster .This is because water is suck  out the air in the vacuum flask and Buchner funnel by flowing it through the aspirator.

Filter at the bottom separates the solids from the liquids.Solid residue at top of funnel can be easily dried. The filtration takes place effeciently in presence of vacuum .

There is a rubber conical seal  which ensures that the apparatus is hermetically closed,maintains vacuum  in apparatus and avoids physical points of stresses.

Vacuum filtration is faster than gravity filtration and is more efficient leading to purer liquid. It is of much importance in crystallization.

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Answer:

c. The heat from the hot cup warms my hands