elemental carbon exists in three forms. the structure of consists of a continuous network of sp3 hybridized carbon atoms creating an infinite array of chair cyclohexane rings. the structure of consists of parallel sheets of sp2 hybridized carbon atoms creating an infinite array of benzene rings.

Answer:

reaction with oxygen

Explanation:

The term oxidation was originally used to describe reactions in which an element combines with oxygen.

Answer:

They will move at the same speed

Explanation:

This will depend on the heat of the water. The hotter the water is the more the molecules move around. As the water cools it will make the molecules move slower.

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Answer:

I only

last answer

Explanation:

One 250ml beaker, a ph probe, 15ml of hcl, 15ml of Naoh, Various substances for pH measurement and 60ml of water are required to determine the ph of different substances.

To determine the pH of different substances, the following materials and steps are required:

Materials:

1. One 250ml beaker

2. pH probe or pH meter

3. 15ml of hydrochloric acid (HCl)

4. 15ml of sodium hydroxide (NaOH)

5. Various substances for pH measurement

6. 60ml of water

Procedure to measure the pH:

1. Start by filling the 250ml beaker with 60ml of water.

2. Immerse the pH probe or pH meter into the beaker, ensuring that it is properly calibrated according to the manufacturer's instructions.

3. Measure 15 ml of hydrochloric acid (HCl) using a graduated cylinder and add it to the beaker.

4. Measure 15 ml of sodium hydroxide (NaOH) using a graduated cylinder and add it to the beaker.

5. Stir the mixture gently to ensure proper mixing of the substances.

6. Take a sample of the substance whose pH needs to be determined and add it to the beaker.

7. Observe the pH reading on the pH probe or pH meter display.

8. Rinse the pH probe or pH meter with distilled water between measurements to avoid contamination.

9. Repeat the steps for each substance to obtain its respective pH value.

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Answer:

A cation is an ion with fewer electrons than protons. Therefore, it has a positive charge. The electric charge on a proton is equal in amount to the charge on an electron. Anions are atoms or radicals (groups of atoms), that have gained electrons. Since they now have more electrons than protons, anions have a negative charge. Halogens always form anions, alkali metals and alkaline earth metals always form cations. Most other metals form cations (e.g. iron, silver, nickel), whilst most other nonmetals typically form anions (e.g. oxygen, carbon, sulfur).

Explanation:

An anion and cation cannot be specifically found on the periodic table.    

The chemical elements are shown in tabular form on the periodic table, sometimes referred to as the periodic table of the elements. It is frequently used in physics, chemistry, and other sciences and is frequently regarded as a symbol of chemistry.

An ion with fewer electrons than protons is known as a cation. It is hence positively charged. Protons and electrons both have the same amount of electric charge. Atoms or radicals (groups of atoms) that have gained electrons are known as anions. Anions now have a negative charge because they have more electrons than protons.

Alkali metals and alkaline earth metals always produce cations, while halogens always produce anions. Iron, silver, and nickel are among the most common non-metals that create cations, whereas the majority of other metals do the same (e.g. oxygen, carbon, sulphur).

The periodic table does not clearly list an anion or cation.

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The quantity of matter in a body,object,or substance is B. Mass.

A body's mass is an inherent quality. Prior to the discovery of the atom and particle physics, it was widely believed to be related to the amount of matter in a physical body.

It is the most fundamental characteristic of matter and one of the fundamental quantities in physics. Mass is a term used to describe how much matter is present in a body. The kilogram is the SI unit of mass (kg). A body's mass does not alter at any point in time.

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Answer:

I hope this is right :)

empirical formula ---› molecular formula

Answer:

temperature

Explanation:

increase in temperature increases the rate of reaction

Answer:

The heat required to convert 1 gram of water to steam is ∆Hvap = 2260 J/g.

So, to convert 15,000 J of heat to steam, we need to divide 15,000 J by 2260 J/g = 6.62 g.

Therefore, 6.62 grams of water are converted to steam when 15,000 J of heat is absorbed.

The valence electrons are the electrons found in the last energy level, that is, those that are farthest away from the nucleus of the atom. They are very important because these electrons are the ones that allow chemical bonds, either because they are transferred to another atom or they are shared.

The Lewis structure shows the valence electrons represented by dots or crosses. In this example, they are represented by dots.

We see that the atom Al, aluminum, has three dots. Therefore, it has three valence electrons.

The Bohr model gives us more information about the atom, it is a way of representing how the electrons are distributed around the nucleus. We can see in this model all the energy levels.

The energy levels are represented by circles around the nucleus, the dots on the circles represent the electrons. And the farthest circle is the last energy level. The dots on this circle will be the valence electrons.

If we count the dots in the farthest circle we see that there are 6, this means that this element has 6 valence electrons.

So the answer will be:

3 valence electrons in Lewis dot structure

6 valence electrons in the Bohr model

Answer:

3,011.10e23.

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. 3.01×10²³molecules are in 0.500 mole of  N₂O₅.

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 directly proportional to given mass.

Mathematically,

Number of molecules/atoms/ions of N₂O₅ = number of moles×6.022×10²³(Avogadro number)

Number of moles of N₂O₅=  0.500 mole

Substituting the given values, we get

Number of molecules/atoms/ions =0.500moles×6.022×10²³(Avogadro number)

Number of molecules/atoms/ions of N₂O₅ =3.01×10²³molecules.

Therefore, 3.01×10²³molecules are in 0.500 mole of  N₂O₅.

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Answer:

A i believe

Explanation:

1. Ammonia is a colorless gas with a chemical formula of NH3, when it comes in contact with water, it will be transformed into Ammonium ion and it will produce one hydroxide ion, and this is why Ammonia will present a more basic (pH) behavior, the reaction that represents this behavior is:

NH3 + H2O -> NH4+ + OH-

Number 4 is the only one that represents it well

Number 3 has the same reaction but since there is a plus sign instead of an arrow, I consider it wrong.

Answer:

yes correct

Explanation:

Answer: x = 2

Explanation:

Answer:

D

Explanation:

because thermal electricity is produced by coal

Answer:

the moving of something form it's places or position

After three half-lives, 12.5% of the original sample of polonium remains.

Polonium is a very infrequent natural element. It is found in uranium ores but it is careless to extract it. It is obtained by bombarding bismuth-209 with neutrons to give bismuth-210, which then purifies to form polonium. All the industrially produced polonium in the world is made in Russia.Po-210 is an effect of the radioactive decay of uranium-238, which decays to radon-222 and then to polonium. Polonium 210 has a half-life of 138 days. Let the opening value of polonium-218 be 100. First half-life. Therefore, 6.25 % of the original sample remains after 4 half-lives that are 12 minutes. Element Polonium has atomic Number 84, p-block, Mass number is 209.

So we can conclude that polonium is a radioactive, silvery-gray, or black metallic element of the oxygen group in the periodic table.

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8 stereoisomers are possible for the given compound.

In the stereoisomer category, there are a number of further subcategories. Stereoisomers are molecules with the same chemical formula that change only in how their atoms are organized in three-dimensional space. Geometrical isomers and optical isomers are the two primary categories of stereoisomers.

Geometric isomers, which are the kind of stereoisomer produced by a double bond or a ring structure, are also known as cis and trans isomers. The geometric isomers cis-2-butene and trans-2-butene are the most straightforward examples.

Molecules with optical isomers have mirror-image structures and can never be overlaid on one another. Because they lack the plane of symmetry, such molecules are referred to as chiral. Enantiomers are the names for the d and l isomers.

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Opinion : I disagree recycling can help them, but it still will not clear the environment.

Answer:

5232.5J

Explanation:

Data obtained from the question. This includes the following:

Mass (M) = 250g

Initial temperature (T1) = 30°C

Final temperature (T2) = 25°C

Change in temperature (ΔT) = T1 – T2 = 30°C – 25°C = 5°C

Specific heat capacity (C) = 4.186J/g°C

Heat (Q) =.?

The heat released can be obtained as follow:

Q = MCΔT

Q = 250 x 4.186 x 5

Q = 5232.5J

Therefore, the heat released is 5232.5J

The amount of heat released when the bottle (250g) of water is cooled  is 5232.5J .

Given data:-

Mass (M) = 250g

Initial temperature (T1) = 30°C

Final temperature (T2) = 25°C

Change in temperature (ΔT) = T1 – T2 = 30°C – 25°C = 5°C

Specific heat capacity (C) = 4.186J/g°C

Heat (Q) =.?

The heat released can be obtained as follow:

\(Q = MC\delta T\\\\Q = 250\times 4.186 \times 5\\\\Q = 5232.5J\)  

 Therefore, the heat released is 5232.5J.

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Answer:

soapy water is not good for plants irrigation that is what I learn

Answer:

Soapy water is not good for plant irrigation because soapy water contains sulphate in it which is not good for the development of plants.

Explanation:

hope this helps

Answer:

to accelerate progress towards meeting internationally agreed reproductive health targets and, ultimately, to attain the highest achievable standard of reproductive and sexual health for all.

Acid--alkali neutralization reactions occur when an acid is mixed with an alkali in equal proportions.

A base or alkali is a substance that reacts with an acid to produce salt and water. Bases that are dissolved in water are called alkalis. For example sodium hydroxide is a base as well as alkali because it dissolves in water.

The amount of acid needed for neutralization will be equal to the amount of base. It means that equivalent amount of acid and base is needed for neutralization process. N part of acid will always neutralize N part of base.

Acid is a substance that gives H⁺ ions and base is a substance that gives OH⁻ ions and both of them unite to give water.

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density = mass/volume

volume= mass/density

Yes, you're correct.

Answer:

Volume isn't equal to mass.

Explanation: Mass is weight, volume is like how much something can hold.

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The oxidation potential of the halogens increases in the order I<Br<Cl<F, which means that if you have a solution of iodide ions and add bromine, the iodide will be oxidized to iodine, and the bromines reduced to bromides:

2 I(-) + Br2 → 2 Br(-) + I2

In the same way, two Br(-) will lose their electronsto a chlorine molecule, and the chlorides formed are going to lose their electrons if confronted with a fluorine molecule. This means that the opposite to the above reaction, i. e.

I2 + 2 Br(-) → no reaction

the brown-purple color of the iodine solution, when mixed with a colorless solution of bromide ions (from sodium bromide) will remain purple-brown, perhaps paler because of the dilution (a physical effect) which comes from mixing of two solutions but not because of any chemical reaction.

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Answer:

The skin helps protect the body from bacteria, germs, and UV rays.

Explanation:

The skin is part of the body's first line of defense. It helps protect the body from infections, bacteria, UV rays and helps the body keep a consistent temperature.

Skin, tears and mucus are part of the first line of defence in fighting infection. They help to protect us against invading pathogens

Immunizations are the best way to protect yourself and your family from illnesses.

Immunizations, or vaccines, are one of the most important public health tools available to protect people from serious and potentially deadly diseases. Vaccines work by introducing a small, weakened form of a virus or bacteria into the body. This triggers the body’s immune system to respond and create antibodies, which provide immunity to the disease when the body is exposed to it. Immunization protects not only the person who is vaccinated, but also their family, friends, and community. It can also help prevent the spread of disease to other countries.It is important to stay up to date on immunizations, as recommended by the Centers for Disease Control and Prevention (CDC).

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