Need help please? Thanks youu

Answer:

The oxidation state of a free element (uncombined element) is zero. For a simple (monoatomic) ion, the oxidation state is equal to the net charge on the ion. For example, Cl– has an oxidation state of -1. When present in most compounds, hydrogen has an oxidation state of +1 and oxygen an oxidation state of -2

Answer:

250 kJ

Explanation:

Step 1: Given data

Step 2: Calculate the change in the internal energy of the system

The internal energy of a thermodynamic system is the energy contained within it. We can calculate the change in the internal energy (ΔE°) using the following expression.

ΔE° = q + w

ΔE° = 105 kJ + 145 kJ = 250 kJ

Answer:

Denaturation is a process in which proteins or nucleic acids lose the quaternary structure, tertiary structure, and secondary structure which is present in their native state, by application of some

Explanation:

Answer:

Most elements are Solids at room temperature

Answer:

See explanation and image attached

Explanation:

The reaction of 1-bromo-2-tert-butylcyclohexane with  potassium tert-butoxide is an elimination reaction that occurs by E2 mechanism.

The E2 reaction proceeds faster when the hydrogens are in an antiperiplanar position at an angle of 180 degrees.

This is only attainable in the trans isomer of 1-bromo-2-tert-butylcyclohexane. Hence trans 1-bromo-2-tert-butylcyclohexane reacts faster with potassium tert-butoxide

Answer:

Adding or removing energy from matter causes a physical change as matter moves from one state to another. For example, adding thermal energy (heat) to liquid water causes it to become steam or vapor (a gas). And removing energy from liquid water causes it to become ice (a solid). ... Most liquids contract as they freeze.

Explanation:

have a nice day

Answer:

2/ Protons and neutrons are found in the nucleus.

Explanation:

Answer:

2

Explanation:

Toasting bread and lemonade powder in water are chemical changes. Pb&j on bread and cutting apple are physical changes.

Answer:

b

Explanation:

Answer:

Heat the molecule

Explanation:

Since most bonds require energy to form, they also give off energy when they are broken. But before most bonds break, the molecule has to be heated. Then the atoms start to move, and when they move too much, the bond breaks. Molecules that require less energy to break than they give off when broken are called fuels.

Answer:

1. Yes

2. it would be the same i guess

3. because it travels to popcorn kernels with its heat and makes it pop'

did i get it right?

Explanation:

Answer:

A. since Nitrogen has 7 electrons and when it gains 3 electrons it will have 10 electrons. using short hand rule it is [Ne]

Answer:

First of all they are super tiny particles of neutrons, electrons and protons. Then they come together to organize a structure of atom. Atoms come together to form a molecule and smaller molecules work together to form macromolecules. Thus, how they organize and form building blocks of a substance.

Hope it helps!<3

Answer:

Yay

Explanation:

could i have a heart and branliest plss

Answer:

The reaction that takes place in a nuclear fission reactor is answer D.

Explanation:

Step-by-step explanation:

Nuclear fission reactions involves the process by which large atomic nuclei are bombarded with energetic particles and release of an enormous amount of nuclear energy, which  mainly ends up as heat energy.

So now, consider the nuclear reaction from D, after the uranium nucleus absorbs the neutron its split into two smaller nuclei (often radioactive themselves), Krypton and Barium and releases more neutrons (or energy).

Answer:

Dibromodifluoromethane

Explanation:

Answer:

The answer is c, Clouds fill with moisture and get too hravy

Answer:

carbon mono oxide CO

Explanation:

as both are in 1:1 ratio so CO is formed

Answer:

C. 100.7 amu

Explanation:

Isotopes of an element are atoms of an element with the same atomic number but different atomic masses. Each atomic mass of an isotope is known as an isotopic mass. An element that exhibits isotope, that is, that have two or more isotopes has a relative atomic mass that is not a whole number.

Relative atomic mass of X is the sum of the products of the relative abundances of each isotope and its isotopic mass.

For Isotope ¹⁰⁰X: 30% × 100 = 30 amu

For Isotope ¹⁰¹X: 70% × 101 = 70.7 amu

Relative atomic mass of X = (30 + 70.7) amu = 100.7 amu

Therefore, the approximate atomic mass of X is 100.7 amu

Taking into account the definition of mass number, isotopes and atomic mass of an element, the average mass of hypothetical element X is 100.7.

First of all, all atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them. Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged (electrons).

On the other hand, the mass number tells us the total number of particles in the nucleus. That is, the mass number is the sum of the number of protons and the number of neutrons in the atomic nucleus.

The same chemical element can be made up of different atoms, that is, their atomic numbers are the same, but the number of neutrons is different. These atoms are called isotopes of the element.

Finally, the atomic mass of an element is the weighted average mass of its natural isotopes.

In other words, the atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.

In this case, two isotopes of hypothetical element X exist with abundances of 30.00% 100-X (the atomic mass is 100) and 70.00% 101-X (the atomic mass is 101).  Then, the average mass of X can be calculated as:

100×0.30 + 101×0.70= 100.7

Finally, the average mass of hypothetical element X is 100.7.

Learn more about average mass:

Answer:

A) Cl2 + 2NaI = 2NaCl + I2

Answer:  its b hope this helps.

Explanation:  

Answer:

c

Explanation:c

it is a good conducter

Answer:

YOURE AMAZING THANK YOU THANK YOU THANK YOU

Explanation:

Answer: MM = 16.55 g/mol

Explanation: Freezing point depression is a phenomena that explains why adding a solute to a solvent decreases the solvent freezing point: when a substance begins to freeze, its molecules slows down and rearrange itself forming a solid. If a solute is added, the molecules from the solvent interfere in the formation of the solid. To guarantee the transformation, the solution has to cooled down even more.

Freezing point and molality concentration is related by

[tex]\Delta T=T_{f}_{(solvent)}-T_{f}_{(solution)}=K_{f}.m[/tex]

where

ΔT is freezing point depression

[tex]T_{f}_{(solvent)}[/tex] and [tex]T_{f}_{(solution)}[/tex] are freezing point of solvent and solution, respectively

[tex]K_{f}[/tex] is freezing point depression constant

m is molality concentration

Dibenzyl ether is the solvent and has the following properties: [tex]K_{f}=[/tex] 6.27 and [tex]T_{f}[/tex] = 3.6°C.

Molality concentration is

[tex]m=\frac{T_{(solvent)}-T_{(solution)}}{K_{f}}[/tex]

[tex]m=\frac{3.6-1}{6.27}[/tex]

m = 0.415

Molality concentration is moles (n) of solute dissolved in a mass, in kilogram, of solvent.

[tex]m=\frac{moles}{mass(kg)}[/tex]

n = m(mass of solvent in kg)

n = 0.415(0.035)

n = 0.0145

Molar mass (M) is the weight of one sample mole and can be calculated as

[tex]n=\frac{m}{M}[/tex]

M = [tex]\frac{m}{n}[/tex]

m in grams

Molar mass of compound X is

[tex]M=\frac{0.24}{0.0145}[/tex]

M = 16.55

Molar mass of molecular compound X is 16.55g/mol