Please help I do not understand

Answer: Most of Earth's carbon was inherited directly from the interstellar medium, it is the material that exists in space between stars in a galaxy.

Explanation: All of the carbon and oxygen in all living things are made in the nuclear fusion reactors that we call stars. The early stars are massive and short-lived. They consume hydrogen, helium, and lithium and produce heavier elements.

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Answer:

here down below is the anwser

Explanation:

Whereas ionic compounds are usually formed when a metal and a nonmetal combine, covalent compounds are usually formed by a combination of nonmetals. Thus, the periodic table can help us recognize many of the compounds that are covalent.

A given substance that has a melting point of -7C and a boiling point of 59C exists as a liquid at room temperature conditions.

The states of matter refer to the separation of the molecules of a given material in certain temperature conditions.

The states of the matter are three and include the gaseous state, liquid state and solid-state.

In conclusion, a given substance that has a melting point of -7C and a boiling point of 59C exists as a liquid at room temperature conditions.

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The name of the compound CH₃CHOOH is acetic acid.

The International Union of Pure and Applied Chemistry (IUPAC) names organic compounds according to chemistry rules.

To locate the longest carbon chain, there are various requirements to follow, such as finding the functional group.

Thus, the name of the compound CH₃CHOOH is acetic acid.

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Answer:

It may leave some chemicals such as herbicides and pesticides in the water

Explanation:

i just took the test

Distillation may leave some chemicals such as herbicides and pesticides in the water. Therefore, option D is correct.

By using selective boiling and condensation, distillation, also known as traditional distillation, is the process of removing the constituents or compounds from a liquid mixture. The process of heating solid materials to create gaseous products is known as dry distillation.

A chemical is purified through distillation by being separated from a non-volatile or less-volatile substance. Because various compounds frequently have different boiling points, when a mixture is distilled, the components frequently separate from the mixture.

Among the many industrial uses of distillation are the production of alcoholic drinks, water purification, and oil refining. Distillation is a physical procedure that removes desired pure compounds from an initial source using heat and other techniques.

Thus, option D is correct.

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Answer:

Here down below is the equation

Explanation:

Iron (III) chloride can be produced by the reaction shown in this equation:

2Fe +3C2 (arrow) 2FeCl3

Calculate the maximum mass of Iron (III) chloride that can be produced from 11.20 grams of iron?

Relative atomic masses: Cl= 35.5 , Fe =56

The maximum mass of iron(|||) chloride(FeCl₃) that can be produced from 11.20g of iron is 0.069 grams.

Mass can be defined as inertia is a quantitative measure of a fundamental feature of all stuff.

It can also be defined as weight is defined as the force exerted by an item while mass is defined as the amount of matter in an object.

The SI unit of mass is kilogram or gram.

Mass can be expressed as

Mass =  Given mass of substance / Formula mass

Mass of substance = 11.20 g

Formula mass of FeCl₃ = 162.2

So, mass = 11.20 g / 162.2 g

               = 0.069 grams

Thus, the maximum mass of iron(|||) chloride(FeCl₃) that can be produced from 11.20g of iron is 0.069 grams.

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Answer:

option 1

Explanation:

you can never have all your reactants used up coz it is not possible eg in space u only loose SOme of gravity

Answer:

A Carbon

Explanation:

Answer:

It would decrease.

Explanation:

This is because there is not enough food (ant) for the ant-lion group.

Answer:

C

Explanation:

Adding and acid and base together until it is completely neutralized will give us water and a salt.

For example:

HCl + NaOH --> NaCl + H2O

HCl being the acid

NaOH being the base

The H2O is water

The NaCl is the salt

Answer:

gram

Explanation:

Gram is a SI unit       (International Ststem of units)

   other SI units :   kg , meter, ampere,  Kelvin

pound   gallon and foot are   SAE (or imperial) units

Answer:

The law of constant proportion states that the percentage of each compound will stay constant regardless of the source size.

In other words, since 11.19% + 88.81% = 100%, in a 100 gram sample, these percentages will stay the same. In this case, 100% is "equal" to 100 grams.

So, 11.19 grams hydrogen and 88.81 grams oxygen will be present in a 100 gram sample of pure water.

Answer:

single covalent bond

Explanation:

The bond formed between two atoms each sharing one electron is called single covalent bond

The figure 1 is the structure of diamond. The type of bond in diamond is covalent sp³ bond. DIamond exists in hexagonal arrangement of carbon atoms.

Allotropes are substances formed from a single elements with different number in various size and shape. Carbon exhibit catenation property which means it can forms chains with other carbon in any large number.

The allotropes of carbon are diamond, graphene and fullerene. Diamond is hexagonal arrangement of carbons atom bonded covalently in sp³ hybridisation.

In graphene as shown in the second figure, bonded carbons atoms are arranged as layers where carbon is in sp²hybridisation. In the case of fullerenes, there are both hexagonal and pentagonal rings adjacent to each and are formed by 60-70 carbons.

In all these allotropes, the bond type between two carbons atoms is covalent. Covalent bond is formed by sharing of electrons between the two atoms.

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Antibodies are part of the human immune system. Basically, they identify bad bacteria and viruses and track them down to fight back.

Electrophillic addition occurs when the substrate has a double bond and the attacking agent is a electrophile.

The term electrophillic addition refers to a type of addition that occurs when the substrate has a double bond and the attacking agent is a electrophile.

The mechanism of the electrophillic attack on methyl propene as shown indicates that the attacking agent is an electrophile(Br^+).

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Explanation:

option option B is the correct answer of given statement helium-4(He)=2

The non-contact forces portfolio includes Gravitational force, Magnetic force and Electrostatic force.

Non contact forces are those forces which are applied on any object without any physical interference or contact.

Some non-contact forces are:

Hence Gravitational force, Magnetic force and Electrostatic force are the non-contact forces.

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The ΔH fusion used to calculate the energy released when a mass of liquid freezes by using the formula Grams liquid x mol/g x ΔH fusion.

The enthalpy of fusion of a substance, also known as (latent) heat of fusion, is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure.

Heat of formation or enthalpy is given for any one mole of substance.

And it will be calculated for moles of gases as, so for this first mass will be converted into moles as-

n = W/M, where

W = given mass in grams

M = molar mass in g/mol

and then multiply the given moles by the enthalpy of formation of one mole.

Hence, Grams liquid x mol/g x ΔH fusion is used.

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Answer:

ANSWER

Explanation:

Answer:

2C8H18+25O2→16CO2+18H2O.



Answer:

In CO there is one mole of Carbon and one mole of Oxygen so the number of atoms will be for two mols

Explanation:

Answer:

it allows us to determine what substances will float and what substances will sink when placed in a liquid.

Answer:

1dm = 10cm

1dm3 = 10cm x 10cm x 10cm = 1000cm3

1L = 1000cm3

so 1litre = 1dm3

4 moles in 2 dm3

= 2 moles in 1dm3 = 2moles in 1L = 2M

1L = 1000cm

0.3 moles in 200cm3 =

200cm3 = 0.2L

so 0.3 moles in 0.2 L = 1.5 moles in 1 L = 1.5M

(I have tried to simplify and show why 1dm3 = 1L)

I hope this helps you understand!

The earth's first oceans would have obtained freshwater as a result of the condensation of water vapor in the atmosphere back then.

The freshwater of oceans was hypothesized to have been formed by the condensation of water vapor present in the early atmosphere of the earth.

The water vapor was thought to have emanated from volcanic activities. The condensation was in the form of rain and the resulting puddles merged together to form the oceans.

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Answer:

3.125g

Explanation:

100/2
50   1
50/2
25    2
25/2
12.5   3
12.5/2
6.25   4
6.25/2
3.125g   5

Answer:

c: fermenting of cheese

Answer:

c

Explanation:

Answer:

If in volume of 10.0L it is 25°C than it will be 37.5C volume in the new temperature if increased from 10.0L to 15.0L

Explanation:

10.0L=25°C

15.0L=?

10×2.5= 25

15×2.5=37.5

Kelvin(K)= C+273=T

=37.5+275=312.5

=C=312.5-275

=C=37.5