Which of the following is NOT an example of a communicable disease.

Answer:

: fluorine, oxygen, or nitrogen.

Explanation:

Hydrogen bonding occurs only in molecules where hydrogen is covalently bonded to one of three elements: fluorine, oxygen, or nitrogen.

Hydrogen bonding occurs only in molecules where hydrogen is covalently bonded to one of three elements: fluorine, oxygen, or nitrogen. These three elements are so electronegative that they withdraw the majority of the electron density in the covalent bond with hydrogen, leaving the H atom very electron-deficient. The H atom nearly acts as a bare proton, leaving it very attracted to lone pair electrons on a nearby atom.

Answer:

The overall molecular shape (the molecule geometry) changes because of the lone pairs repulsion, but the electron geometry does not change because whether an atom or a lone pair is added there's still two electrons being added.

Explanation:

hope that helps :D

Answer:

Un par solitario o par de electrones no compartidos es un par de electrones de valencia que no se encuentra formando un enlace, ni compartido con otros átomos. Cuando un átomo se agrupa con otros para formar una molécula, sus electrones más externos -también conocidos como electrones de capa de valencia- dejan de pertenecer únicamente al átomo del que provienen, pasando a pertenecer a la molécula formada. Los orbitales atómicos de valencia dejan de existir como tales y pasan a formar orbitales moleculares con características diferentes a las originales. Como los pares solitarios se encuentran en la capa más externa de los átomos, cuando estos átomos forman moléculas pasan a formar parte del conjunto de electrones de valencia de la molécula. De esto se deduce que los pares solitarios son, de hecho, un subconjunto de los electrones de valencia de la molécula a la que pertenecen.

Explanation:

espero que te sirva :)

Answer:

B no. is the answer because

Explanation:

So this can probably be the the answer

Hope my answer helps

Answer:

All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons.

hope this helps

Explanation:

Elements in the same period are those that are in a single horizontal line from left to right. They do not share the same type of chemical reactivity as seen in groups. They only real thing that these elements share in common is the same principal quantum number, or main energy shell.

Answer:   Germanium has a cubic closest packed structure as a solid. Assuming that germanium has an atomic radius of 159 pm, calculate the density of solid germanium. __________ g/cm3 b.) Germanium has a face-centered cubic unit cell. The density of germanium is 5.32 g/cm3. Calculate a value for the atomic radius of germanium. ___________pm c.) You are given a small bar of an unknown metal X. You find the density of the metal to be 12.0 g/cm3. An X-ray diffraction experiment measures the edge of the face-centered cubic unit cell as 3.89 â„« (1 â„« = 1 ✕ 10−10 m). Identify X.

Explanation:

The density of Germanium is equal to 5.30g/cm^3

Data Given;

For a cubic closest packed = 4r

[tex]4r = \sqrt{2a} \\ a = \frac{4}{\sqrt{2} }r\\ a = \frac{4}{2}*159*10^-^1^0\\ a = 4.50*10^-^8cm[/tex]

The density of the cube is given as the ratio between the mass and volume. But in this case, we have a formula

[tex]d = \frac{Zm}{Na^3}\\ d = \frac{4*72.64}{6.023*10^2^3*9.09*10^-^2^3}\\ d = 5.30 g/cm^3[/tex]

NB;

The density of the cube is equal to 5.30g/cm^3

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Answer:

when you pray you will feel a peace and happiness in your heart

Answer:

in physics we never work with minutes only seconds.

Answer:

the lungs are part of the respiratory system

Explanation:

Allows you to talk and to smell

Oxygen to the cells in your body

and helps you breathe

Answer:

Your lungs are part of the respiratory system, a group of organs and tissues that work together to help you breathe. The respiratory system's main job is to move fresh air into your body while removing waste gases.

Explanation:

Main functions of the lungs : -

Answer:

c

Explanation:

mostly it used in movies in the crime scence

Accelerants are flammable solvents such as kerosine, turpentine, gasoline etc. Therefore, the accelerant obtained from the crime scene here, is gasoline.

Accelerants are substances that can combine, blending, or disturb another substance, causing the speed of a natural or artificial chemical process to increase. Accelerants are important in chemistry because they can speed up most chemical reactions.

Accelerants change a chemical bond, accelerate a chemical process, or restore organisms to homeostasis. Accelerants are not always catalysts because they can be consumed by the process.

Flammable gases or solvents such as gasoline, diesel, butane gas, kerosine, turpentine etc are examples of accelerants. Therefore, among the given substances , gasoline is the accelerant.

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Answer:

A.Yes

Explanation:

Answer:

Foil is made from the same material as soda cans (aluminum), but since it's most often contaminated with food waste or combined with plastic (like with yogurt tops), there's no guarantee you can recycle it with your aluminum cans.

Explanation:

Mark me brainly please

Answer:

Explanation:

The collision theory explains why reactions occur between atoms, ions, and molecules. With the increase in temperature, there is an increase in the number of collisions. Increasing the concentration of a reactant increases the frequency of collisions between reactants and will, therefore, increase the reaction rate.

Due to the lack of information provided, the best I can give you is this:

In Chemistry, the letter c most commonly refers to specific heat, which is present in the ratio J/g°C.

Hope it helps :)

Answer:

A simple microscope employs a concave mirror. A compound microscope employs a plane mirror at one side and a concave mirror at the other. It contains only one adjustment screw to move the limb up and down for focusing on the object.

Answer:

D po

Explanation:

Sana nakatutulong

#Carry on learning

Pa brainliest po

Answer:

group 18

Explanation:

Elements with the most valence electrons are in group 18

Answer:

It's gotta be the third answer

Explanation:

Hope this helpped!

Answer:

the ability to be dissolved, especially in water.

Explanation:

Answer:In the chloroplast, energy in sunlight is passed around different chlorophyll molecules until it reaches a specific chlorophyll molecule

Explanation:

Answer: In the chloroplast, energy in sunlight is passed around different chlorophyll molecules until it reaches a specific chlorophyll molecule

The cart accelerated at a constant rate of approximately 0.8 m/s². Option (B) is correct.

Option B is the best description based on the graphed position data during the 7-second time interval. The cart's acceleration can be determined by analyzing the shape of the position-time graph.

If the cart was stationary, the position-time graph would be a horizontal line (option C). If the cart moved at a constant velocity, the graph would be a straight line inclined at a constant angle (option D).

However, the graph likely shows a curved line, indicating changing position over time. This suggests that the cart experienced acceleration. To further confirm, calculate the acceleration:

Acceleration (a) = Δv / Δt,

where Δv is the change in velocity and Δt is the change in time.

Given the time interval is 7 seconds, and the initial and final velocities are likely different, you can calculate the average acceleration. If the average acceleration is approximately 0.8 m/s², then option B is correct.

The graphed data aligns with the scenario of constant acceleration, supporting option B.

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Answer:

19 electrons, that's what I say

A chemical bond is an electrostatic force between a proton and an electron. Hence, option D is correct.

A chemical bond is what holds atoms together in molecules.

A chemical bond is what holds atoms together in molecules.

Bonds arise from the electrostatic forces between positively charged atomic nuclei and negatively charged electrons (the positions of which in space are determined by quantum mechanics).

Hence, option D is correct.

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Answer:

I believe tha answer is travels at the same speed of light

Explanation:

hope this helps

Answer:

1. Forward and Backward reaction rate are equal

2. Concentration of reactants and products are the same.

Answer:

members shall perform their duties with integrity, intelligence and competence in the application of specialized skill and technical knowledge with excellence and expertise.

Explanation:

any members on duty should be wiling and ready to help at all times

Answer:

koe Pgl smjega but kya karu mods ka acc mil nai raha and acc delete karna h

-i effect required here

Let's see which oxide shows more -i effect

P lies below Al

And -i effect increases down the group so acidity increases

Answer:

Nitric acid decomposes sodium cyanide and sodium halide. else, they precipitate in test and misguide the result. Therefore, dilute nitric acid is added before testing halogens to expel all the gases if evolved.

Answer:

0.089

Explanation:

n= m/M = 2.5/14 = 5/28 mol

ok done. thank to me :>