what element generally appears in the formula of an acid

The enthalpy of reaction for the decomposition of calcium carbonate is 177.4  KJ/mole .

We know that the enthalpy of reaction can be obtained from the enthalpy of formation of the reactants and that of the products using the formula;

ΔHrxn = ΔHf (products) - ΔHf (reactants)

The heat of formation of the species are as follows;

ΔHf (CaCO3(s)) = −1206.9 KJ/mol

ΔHf (CaO(s)) =  - 636 KJ/mole

ΔHf (CO2(g)) = -393.5  KJ/mole

ΔHrxn = [( -393.5  KJ/mole ) + ( - 636 KJ/mole)] - [ −1206.9 KJ/mol]

ΔHrxn = 177.4  KJ/mole

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Answer:

First one is 656.3 and second is endothermic.

Explanation:

Edge Thermochemical Equations assignment

Answer:

1. The kinetic energies of the particles (atoms, molecules, or ions) that make up a substance. Kinetic energy tends to keep the particles moving apart.

2. The attractive intermolecular forces between particles that tend to draw the particles together.

Answer:

12.5grams would remain after time has elapsed

Answer:

decreasing

Explanation:

from left to right the nuclear effective charge is increasing, attracting with a greater force the electrons and making the atom to reduces itd atomic radius

The atomic radius decreases along a period in periodic table.  Thus, from the third element Li to the 9th element fluorine, atomic radius decreases and F has the lowest radius among them.

Atomic radius is the distance from the  nucleus to the valence shell. The atomic radius decreases from left to right in periodic table. Thus, the higher atomic radius is exhibited by metallic elements.

The horizontal rows in the periodic table is called periods. Along a period , atomic radius decreases and electronegativity increases. When moving to the right there is no increase in the number of shells and the filling of electrons does not achieve octet except for group 18. Hence, they are electronegative.

From atomic number 3 to 9 atomic number is decreasing. Hence, among these elements, the smallest one is fluorine (Z = 9).

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Answer:

4.51 x 10 to the 23 power

Explanation:

Single-displacement reaction occurs when aluminum reacts with copper nitrate.

Single-displacement reaction is the type of chemical reaction that occurs when aluminum (Al) reacts with copper nitrate (Cu(NO3)2). In this type of reaction, aluminum takes the place of copper and produced aluminium nitrate.

Aluminum does not react with potassium nitrate (KNO3) although it reacts with copper nitrate because potassium nitrate (KNO3) is a stable compound which held each other very tightly so we can conclude that Single-displacement reaction occurs when aluminum reacts with copper nitrate.

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Taking into account the bond energy, the O=O bond is the strongest and the O–H bond is the weakest.

The bond energy is the average total energy that would be released by the formation of a mole of chemical bonds, from their constituent fragments (all in the gaseous state).

In other words, the normal or standard bond enthalpy is defined as the change in enthalpy or heat released, under standard conditions of 1 atmosphere and 25ºC, that accompanies the reaction of formation of one mole of bonds from the isolated atoms in gaseous state.

The higher the bond energy, the stronger and more stable the bond will be.

So, taking into account all the previous, the O=O bond is the strongest and the O–H bond is the weakest.

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Answer:

valence electrons get closer but rest of them are remain same

Answer:

he introduced triads of similar chemical properties in periodic table.

Explanation:

Answer:

Sodium has 11 protons and Magnesium has 12. The way that the periodic table is set up doesn't allow for any elements to be in between. The element would have to have 11.5 protons, which is impossible

Structure of periodic table is designed in a way that successive elements have difference of 1 electron and proton as sodium and magnesium have 11 and 12 protons respectively there is no space for any other element.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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Answer:

Mass and relative abundance of each isotope of that element

The atomic mass of element has been dependent on  mass of each isotopes and their abundance in nature.

The atomic mass has been the mass of neutrons and protons of the element. There has been the presence of the isotopes of the elements, with varying abundance, and varying atomic masses.

The atomic mass of the element has been the relative average atomic mass of the element with respect to the mass of the isotopes and their percent abundance.

The average atomic mass (amu) has been given by:

[tex]amu=M_1A_1\;+\;M_2A_2[/tex]

Where, [tex]M_1A_1[/tex] has been the atomic mass and abundance of isotope 1.

[tex]M_2A_2[/tex] has been the atomic mass and abundance of isotope 2.

Thus, the average atomic mass has been dependent on mass of each isotopes and their abundance in nature.

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Astrobiologist means someone who studies the possibilities of life beyond earth. what would YOU do to search for life? They're asking for your opinion :)

Answer:

did u get it yet

Explanation:

Answer:

B. wave 1 has a larger wavelength than wave 2

Wave 1 has larger wavelength than wave 2. Hence, option B is correct.

Wavelength is defined as "the difference between two successive crests and troughs of the wave. The wavelength described the how long wave is. It is measure in the direction of wave.

Wavelength is usually denoted by the Greek letter ( λ ).

Wavelength is equal to the speed ( V ) of wave train to divided by frequency ( F ). It is given as,

λ = V ÷ F

Here,

λ = wavelength

V = speed

F = frequency

The distance between one crests (top) to another crests is a Wavelength. Alternately the distance between one troughs (bottom) to another troughs is wavelength.

The distance between two  crests in wave 1  is more comparatively wave 2 so , wave 1 will have larger wavelength than wave 2.

Therefore, wavelength is used for measuring the radiation.

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Answer:

D............................

There are two types of chemical compound one is covalent compound and another is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. The correct representation is option D.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Covalent bond is present in molecule HCl. Hydrogen has 1 electron in its outermost shell. Chlorine has 7 electrons in its valence shell. So one one electron from each element is shared between them to form a covalent bond.

Therefore, the correct representation of arrangement of electrons in a hydrogen chloride molecule is option D.

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The bonding activity that occurs between phosphorus and chlorine is Covalent Bonding

Covalent bonding is an interaction between two atomic elements that share electrons between themselves.

In Phosphorus Pentachlorine PCl₅, covalent bonding occurs between Phosphorus and Chlorine.

This is because, Phosphorus is the central atom that is attached to 5 different chlorine atoms, each chlorine atom needs one electron each to complete its octet rule and since phosphorus has five valence electrons in its outermost shell, it shares it with each of the chlorine atoms.

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Answer:

Covalent Bonding

Answer:

Any substance that cannot be decomposed into simpler substances by ordinary chemical processes.

Another definition:

An element is the simplest pure substance which can neither be split nor built up from other simpler substances by chemical reaction

Answer:

cellular respiration

Explanation:

hope this helps :)

brainliest plzzzzzzz

Answer:

the answers are given in the photo

The boiling points of two or three other pairs of liquids in which one liquid has a lower molecular mass than the other can be studied in order to see if the pattern is consistent.

The boiling point of a substance refers to the temperature at which its vapor pressure is equal to the atmospheric pressure. The boiling point of a substance has a lot to do with its molecular mass.

Generally, substances that has a higher molecular mass has a higher boiling point except other factors at at work. In order to confirm whether the pattern that you are noticing about molecular weights and boiling point is consistent, three other liquids with different molecular masses, one being higher than the other can be studied and their boiling points compared.

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Explanation:

getting the empirical formula

For carbon

3.01/12 = 0.2508

For oxygen

4/16 = 0.25

For Cl

17.81/35.5= 0.501

0.2508 ÷ 0.25 = 1.0032

0.25 ÷ 0.25 = 1

0.501 ÷ 0.25 = 2.004

Empirical formula of the compound = CCl20

Molar mass = (1×12) + (2×35.5) + (1×16)

= 12 + 71 + 16

= 99g/mol

percentage composition= 24.81/99 × 100

= 25.06%

A 24.81-g sample of a gaseous compound containing only carbon, oxygen, and chlorine is determined to contain 3.01 g C, 4.00 g O, and 17.81 g Cl. the compound's percent composition is  25.06%.

The impure form of carbon is Amorphous which is used for the manufacture of car batteries and dry cells, ink and paints; So the majority element of carbon is present in charcoal, so these are used as fuel.

Graphite is derivative form of carbon used as a lubricant in heavy industrial machinery, making pencil leads, these carbon are used in the production of steel.

The empirical formula, For carbon 3.01/12 = 0.2508

For oxygen 4/16 = 0.25, For Cl 17.81/35.5= 0.501, 0.2508 ÷ 0.25 = 1.0032

0.25 ÷ 0.25 = 1

0.501 ÷ 0.25 = 2.004

Empirical formula of the compound = CCl20

Then the Molar mass = (1×12) + (2×35.5) + (1×16)

= 12 + 71 + 16

= 99g/mol

percentage composition= 24.81/99 × 100

= 25.06%

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Explanation:

most common elements that bond with oxygen is Hydrogen (H2) to form water

Answer:

mercury 13.6 has a great density than milk

Answer:

Coca-Cola or Pepsi

Explanation:

Im sure one of those

Answer:

1. H=2, O=1

2. H=4, O=2

3. C=1, O=1

4.

a. reactants C=1, O=2

b. products C=1, O=2

5.

a. reactants H=4, O=2

b. products H=4, O=2

6

a. reactants C=1, O=1, H=4

b. products C=1, O=1, H=4

Answer:

Our process will be to change the mass of NO2 to moles by dividing by the molar mass, and then we multiply the number of moles with Avogadro's number (6.02 x 10^23)

Molar mass of NO2 = (14) + (16)x2 = 46g/mol

45.8/46 = 0.99 or just 1 mole when you round it.

Now just multiply the moles with Avogadro's number

1 x (6.02 x 10^23)

= 6.02 x 10^23 molecules of NO2 reside in 45.8g of NO2