Which of the models shown below best represents the modern understanding of the structure of the atom?
Model B
Model A
Model A
Model C
Photos by Phood and Furman
Model B
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Model C

Answer:

12.5 gm

Explanation:

15 days is three half lives  

100 * (1/2)^3 = 12.5 grams

1 mole of water = 18g

6 moles of water = 18×6 = 108 g

Answer:

developing the atomic theory of matter

Explanation:

Answer:

True.

Explanation:

This is because when the number of protons in the nucleus increases the neutrons needed for a stable nucleus increases even more rapidly.

Best of luck!!!

Answer:

heat is released in going from reactants to products

Explanation:

hope this helps

Answer:

I think its A And C OR D HOPE ITS RIGHT

Explanation: BY THE LOVE YOUR AVTAR

True statements are:

Density increases if the volume of an object decreases and the mass remains the same.

Density increases if the mass of an object increases and the volume remains the same.

Density remains the the same if the mass and volume of an object increases proportional.

Further:

Density = Mass/Volume

Answer:

In physical changes no new materials are formed and the particles do not change apart from gaining or losing energy

Explanation:

Answer:

9 days

No explanation needed.

The equations for the preparation of C₂H₅Br from alcohol using PX₃ and HX are shown in the attachment below.

a) Preparation of C₂H₅Br from alcohol using PX₃

In PX₃, X refers to the halides (F, Cl, Br etc.). Since the desired ethyl halide is ethyl bromide (C₂H₅Br) , then X in PX₃ will be Br. Therefore, PBr₃ will be used in the reaction as shown in the attachment below.

b) Preparation of C₂H₅Br from alcohol using HX

Also, In HX, X refers to the halides (F, Cl, Br etc.). Since the desired ethyl halide is ethyl bromide (C₂H₅Br), then X in HX will be Br. Therefore, HBr will be used in the reaction as shown in the attachment below.

Learn more here: https://brainly.com/question/21780261

Explanation:

Add ethanol ( or whichever you choose) into the mixture.

Use a filter to separate the salt from mix.

Evaporate the ethanol/petroleum spirit -sugar mix to get the sugar by itself.

Done!

Answer:  1)  a) Use a magnet, or b) add to water abd scoop off the floating plastic beads

2)  Grind the leaf and solubilize what you can in water, then use filter paper as a chromatograph to separate the colors.

Explanation:

1)  Look for any property between the two substances that has a large enough difference to provide an avenue for separation.  Density is good, particle size also can be used, solubility, and magnetic properties, among others.

2)  https://www.britannica.com/science/paper-chromatography

Answer:

Reaction??

Explanation:

Answer:

race, religion, sex, if they are 40 or older, have a disability, pregnancy/childbirth. hope that helped

Answer:

Show me the previous question so I can help

Answer:

the events of the story

Explanation:

hope this helps

Answer:

V= π ×r² × h

V = 3.14 × (0.9)² × 4

V = 3.14 × 0.81 × 4

V = 10.1736

Mass = Volume × density

M = 10.1736 × 2.6

M = 26.45136 g

Answer:density

Explanation:

it’s how’s how dens the ball is

Note down the formula below

[tex]\boxed{\sf Mass\%\;of\; element=\dfrac{Mass\:of\:the\: element}{Mass\;of\:the\: compound}\times 100}[/tex]

Mass of the compound

[tex]\\ \sf\longmapsto 32+2=34g[/tex]

Mass % of Hydrogen:-

[tex]\\ \sf\longmapsto \dfrac{2}{34}\times 100[/tex]

[tex]\\ \sf\longmapsto \dfrac{1}{17}\times 100[/tex]

[tex]\\ \sf\longmapsto 5.8\%[/tex]

Mass % of Oxygen:-

[tex]\\ \sf\longmapsto \dfrac{32}{34}\times 100[/tex]

[tex]\\ \sf\longmapsto \dfrac{16}{17}\times 100[/tex]

[tex]\\ \sf\longmapsto 94.2\%[/tex]

Answer:

this is from another brainliest answers.

Explanation:

Ionic compounds need to be molten or in solution for electrolysis to work. This is because the charged particles that make them up (ions) need to be free to move to the electrodes.

Explanation:

just take the given moles and multiply it with the ratio of molecules to moles to get your answer

The number of nitrogen molecules in 6.0 moles of N2 is = 3.6 × 10²⁴

Avogadro's number( 6.02 × 10²³) is equal to the number of molecules in 1 mole of substance.

That is,

1 mole of N2 = 6.02 × 10²³

6 moles of N2 = 6 × 6.02 × 10²³

= 36.12 × 10²³

= 3.6 × 10²⁴

Therefore, the number of nitrogen molecules in 6.0 moles of N2 is = 3.6 × 10²⁴

Learn more about molecules here:

https://brainly.com/question/26044300

Answer:

Not all mixtures are solutions. A solution is a specific term that describes an even or homogeneous mixture of a solute, the substance being mixed, in a solvent, the substance that is in a greater amount in which the solute dissolves. All solutions are mixtures because it is two or more substances mixed together.

Answer:

C is the correct answer.

Explanation:

Agar provides a solid growth surface for the bacteria, upon which bacteria reproduce until the distinctive lumps of cells.

The agar medium is used in Petri dishes because it helps microorganisms grow. option C is correct.

A microorganism is a microscopic body that cannot be seen with the normal human eyes on anything it can be a virus or bacteria or both. Viruses are disease-causing mostly but there are some good bacteria too.

The use of agar medium is the source of food for the microorganism as all the micronutrients and macronutrients with essential amino acids are present into it.

Therefore, option C is the correct agar medium used in Petri dishes because it helps microorganisms grow.

Learn more about microorganism, here:

https://brainly.com/question/9004624

#SPJ2

Number of men required to stand on top of each other to reach moon from earth are :

[tex] \boxed{ \boxed{ \: \: \: \: \: \: \: 210320000 \: \: \: \: \: \: \: }}[/tex]

Answer:

3. A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance

4.extensive and intensive properties.

Answer:

hypothesis = A tentative explanation for a question, testable through experiments.

theory = An explanation supported by many experiments, answers "why".

law = A relationship in nature supported by many experiments.

Explanation:

Answer:ok

Explanation:fish