A block of wood has a mass of 120g and a volume of 200cm what is the density

Answers

Answer 1

Answer: D= m/vD= (120 g)/(200 cm)D= .6

Answer 2

Answer: D= m/v
D=(120g)/(200cm)
D=.6

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Which type of energy transfer occurs when water is heated on a stove

Answers

Hello User,

The type of energy that occurs when water is heated on stove is heat transfer. Heat transfer is the exchange of thermal energy.

8. Select the lattice energy for rubidium chloride from the following data (in kJ/mol]Rb(s) ---> Rb(g) = 85.8
IE1(Rb) = 397.5
BE(Cl2) = 226
deltaHf(RbCl) = -431
Electron Affinity Cl = -332

a. -53.7
b. +53.7
C. -695
d. -808
e. +808

Answers

Answer:

Option C

Explanation:

The chemical reactions which are involved while solving this problem is there in the file attached and each chemical reaction is represented by a certain equation number

Lattice energy for rubidium chloride ( RbCl) is represented by the equation 6

Equation 1 represents the change in enthalpy for formation of RbCl

Equation 2 represents the sublimation reaction of rubidium

Equation 3 represents the ionization enthalpy of rubidium

Equation 4 represents the enthalpy of atomization of chlorine which means it describes the bond enthalpy of Cl2 molecule

Equation 5 represents the electron affinity of chlorine

To find the lattice energy for RbCl we have to use all the equations from 1 to 5 so that at last we get the equation 6

We have to perform operations such as

Equation 1 - equation 2 - equation 3 - equation 4 - equation 5

By performing these operations the intermediate compounds gets cancelled and at last we get equation 6

So Equation 1 ≡ ΔH $_(f)$ = -431 kJ/mol

Equation 2 ≡ Rb(s) ---> Rb(g) = 85.8 kJ/mol

Equation 3 ≡ IE1(Rb) = 397.5 kJ/mol

Equation 4 ≡ BE(Cl2) = 226 kJ/mol

Equation 5 ≡ Electron Affinity Cl = -332 kJ/mol

Value corresponding to the equation 6 will be the value of lattice energy of RbCl and the value is -695·3 kJ/mol

∴ Lattice energy for rubidium chloride is approximately -695 kJ/mol

Final answer:

The lattice energy for rubidium chloride (RbCl) is calculated by substituting the given values into the equation derived from Hess's Law. The calculated lattice energy is found to be -695 kJ/mol.

Explanation:

In this question, you are asked to select the lattice energy for rubidium chloride (RbCl). The lattice energy can be calculated using various given energies including enthalpy of formation (ΔHf), electron affinity (Cl), enthalpy of sublimation, ionization energy, and bond dissociation energy. Using Hess's Law, this can be summed up as:

ΔHf(RbCl) = [Sublimation Energy (Rb) + Ionization Energy (Rb) + 0.5 × Bond Energy (Cl₂) + Electron Affinity (Cl)] - Lattice Energy (RbCl)

By rearranging this formula, we find that the Lattice Energy (RbCl) = [Sublimation Energy (Rb) + Ionization Energy (Rb) + 0.5 × Bond Energy (Cl₂) + Electron Affinity (Cl)] - ΔHf(RbCl). Substituting in the given values, we find the lattice energy to be -695 kJ/mol. Therefore, the correct option is C. -695.

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State of an atom with same number of proton and electrons

Answers

Most elements tend to have the same number of electrons and protons. This gives the element a neutral charge, aka no charge at all.

Here is an example:- Flourine
7 electrons and 7 protons

What are some facts about covalent bonding?I need some information for my chemistry poster please, thank you.

Answers

When two atoms come near each other, sometimes they stick together to make a molecule. One way they can stick together is by covalent bonding.In covalent bonding, the atoms are unstable because their outer rings of electrons aren't filled up. By sharing electrons with other atoms, these atoms can fill up their outer rings and become stable. In water, for instance, the oxygen atom needs two more electrons to be stable, and the hydrogenatoms each need one. When they get together, the oxygen atom shares oneelectron with each of the hydrogen atoms, and the hydrogen atoms eachshare one electron with the oxygen atom.Now that the atoms have become stable, it's pretty hard to knockthem back into being unstable again, so covalent bonds are strong andmolecules that form with covalent (sharing) bonds are strong molecules.Covalent bonding makes very strong connections between the atoms,so it's hard to break these molecules apart. On the other hand,molecules that join with covalent bonds aren't very much attracted toeach other (unlike with ionic bonding), so they move freely around eachother. That means that most molecules that form covalent bonds makeeither liquids or gases, like water and carbon dioxide. The main exception is metals,which hold together using covalent bonding but are still solids. That'swhy metals are so flexible and easy to melt so you can make them intodifferent shapes.

Which elements have isotopes with the same number of protons and neutrons

Answers

Answer:

Lead

Explanation:

One that I know is lead.

Final answer:

Isotopes refer to different forms of the same element having identical number of protons but varying number of neutrons. Examples of isotopes with equal number of protons and neutrons include Carbon-12 and Deuterium. These isotopes, including the unstable ones termed as 'radioactive isotopes', contribute significantly to an element's atomic mass.

Explanation:

Isotopes are alternate forms of the same element that have the same number of protons but a different number of neutrons. When an isotope has the same number of protons and neutrons, it can be found in lighter elements such as carbon and hydrogen. A good example is the isotope Carbon-12 (with six protons and six neutrons) which is a common isotope of carbon found on Earth. Another example is Hydrogen-2 or Deuterium (with one proton and one neutron). This is because the number of protons (also known as the atomic number) identifies an element - regardless of the number of neutrons.

The presence of isotopes is important in elements as they contribute to the overall atomic mass and affect the behavior of the element. For instance, radioactive isotopes, such as Carbon-14, are unstable and can emit subatomic particles or energy to attain a lower potential energy state, which explains why they're used in radioactive dating methods.

It's worth noting that the number of neutrons in an atom can vary and is not necessarily equal to the number of protons, especially in heavier elements.

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Fill in the blanks rigids have ..... volume and.....

Answers

Jojo is this really u

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