Plz help on question 3

Answer:

3.97 x 10²³atoms

Explanation:

Given parameters:

Mass of ammonia = 11.22g

Unknown:

Chemical amount of ammonia present  = ?

Solution:

The chemical amount present in a substance is the number of atoms it contains.

To solve this problem, from the given mass find the number of moles first.

  Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

Molar mass of NH₃   = 14 + 3(1) = 17g/mol

  Number of moles  = [tex]\frac{11.22}{17}[/tex]   = 0.66mole

   1 mole of any substance contains  6.02 x 10²³ atoms

  0.66 mole of ammonia will contain 0.66 x 6.02 x 10²³ atoms

                                                            = 3.97 x 10²³atoms

Answer: the atomic number is 11

Explanation: using a electron configuration chart you can see that 3s1 stops on Na which is 11 on the table

Answer:

SOURCES OF GAMMA RAYS

Explanation:

They are produced by the hottest and most energetic objects in the universe, such as neutron stars and pulsars, supernova explosions, and regions around black holes.

Hope This Helps * I Used My Science Book To Answer This

Ionic bonds are formed between ionic compounds, Ionic compounds are formed when metals join with nonmetals.

Ionic bonds are electrostatic bonds that are formed between metals and nonmetals. It is an electrostatic attraction between oppositely charged ions in a chemical compound.

These bonds are formed when two or more atoms lose or gain electrons. An example of ionic bonds can be seen in the NaCl compound.

Na⁺ + Cl⁻ = Na⁺Cl⁻

NaCl is formed by the joining of oppositely charged elements. They constitute salt. Salt is made up of ionic compounds, so it easily dissociates into sodium and chloride when mixed in water.

Thus, ionic compounds are created when metals combine with nonmetals, and these combinations result in the formation of ionic bonds.

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Answer:

D- a weak base

Explanation:

The ph scale goes from 1-10 a solution over 7ph is classified as basic. A solution thats 8.4 is only 1.4 over 7pH, making it a weak basic solution. An example of a strong base would be a solution with a pH of 9.2 (for example).

Answer:

D.) The solution is a weak base

Explanation:

I got it correct on founders education

Answer:

Explanation:

The molar mass is the mass of a given chemical element or chemical compound (g) divided by the amount of substance (mol).

The molar mass of a compound can be calculated by adding the standard atomic masses (in g/mol) of the constituent atoms. hope this helps...

After mitosis, it is expected that the daughter cells of a fruit fly with 8 chromosomes should have 8 chromosomes.

MITOSIS:

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Answer:

is there any answer choices????

Answer:

The answer is Refraction

Answer: Time needed: 2.5 s

Distance covered: 31.3 m

Explanation:

I'll start with the distance covered while decelerating. Since you know that the initial speed of the car is 15.0 m/s, and that its final speed must by 10.0 m/s, you can use the known acceleration to determine the distance covered by

on one side of the equation and solve by plugging your values

To get the time needed to reach this speed, i.e. 10.0 m/s, you can use the following equation

Explanation:

Answer:

Explanation:

The mass of the vehicle can be found by using the formula

[tex]m = \frac{f}{a} \\ [/tex]

f is the force

a is the acceleration

From the question we have

[tex]m = \frac{1800}{1.5} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

Open cluster

Explanation:

Why should I explain?

Answer: D open cluster

Explanation:

Answer:

Temperature is an abiotic component of an ecosystem

Explanation:

Answer:

true

Explanation:

because if you really take a moment to think about it atoms are made of molecules.

Answer:

2.08L

Explanation:

V1 = 2.00L

P1 = 101kPa

P2 = 97.0kPa

V2 = ?

from Boyle's law,

P1V1 = P2V2

101 × 2 = 97 × V2

V2 = 202/97 = 2.08L

Therefore, the new volume is 2.08L

Answer:

2.1L

Explanation:

Given parameters:

Initial volume  = 2L

Initial pressure  = 101kPa

Final pressure  = 97kPa

Unknown:

Final or new volume  = ?

Solution:

Now to solve his problem which relates pressure and volume, we simply apply Boyle's law which is mathematically expressed below;

          P₁ V₁  = P₂ V₂

P and V are pressure and volume

1 and 2 are initial and final states;[tex]\frac{101 x 2}{97}[/tex]

         101 x 2  = 97 x V₂

              V₂  =  [tex]\frac{101 x 2}{97}[/tex]

               V₂ = 2.1L

Answer:

a. atoms are indivisible. ... atoms can not be destroyed in chemical reactions.

Explanation:

Hope this helped :D

Answer:

Osmosis is the process that describes water moving through a membrane.

I am not sure about the second question.

Explanation:

Answer:

1- number of neutrons

2-  mass

Explanation:

Answer:

Explanation:

The answer is principle of original lateral

Continuity. Hope this helps

Answer:

salt, sugar, and so on.

Explanation:

A pure substance is a material that has a constant composition, and has the same properties throughout the sample. pure substances in chemical equations form predictable products. In chemistry, a pure substance has only one type of atom , molecule, or compound.

Answer:

I believe that its B

Explanation:

google lol

Answer: D

Explanation:

Answer:

C. Friction

Explanation:

Because friction needs contact to occur, the other forces do not require contact like friction does.

Answer:

I’ll put the answer the comments if you can give the actual question

Explanation:

Answer:

The number of photoelectrons are increased

Explanation:

According to Albert Einstein, when light falls on a clean metal surface, electrons are ejected from the clean metal surface. This is known as photo electric effect.

The kinetic energy of the emitted photoelectron depends on the energy of the incident photon and the work function of the metal. If the energy of the incident photon is less than the work function of the metal, photoelectric effect does not occur.

Below a given threshold frequency or wavelength called the threshold frequency or threshold wavelength photoelectric effect does not occur.

However, doubling the photon flux of light doubles the intensity of the light. This only leads to increase in the number of photons and have nothing to do with the energy of the emitted photoelectrons.

Explanation:

The air around the equator has a high temperature, so it has a _lower_____ air pressure

Answer: Melting or boiling

Explanation:

Melting or boiling point is another property that scientists can use to identify a substance. Melting point is the temperature at which a substance changes from solid → liquid. Boiling point is the temperature at which a substance changes from liquid → gas.

Answer:

Energy from different sources leads to different types of rocks.

Explanation: Energy inside Earth melts rock into liquid rock, but energy from the sun causes rock to weather into different types of rock.

Rocks are formed in earth by the deposition of minerals and decomposition of massive tectonic plates by the hot magma which is melted by the heat energy radiated from sun.

There are broadly three different types of rocks, namely sedimentary rocks, igneous rocks and metamorphic rocks . They are classified based on their formation and composition.

The magma that the molten mineral fluid inside the earth crest melts under heat radiated from sun and this hotter fluid flows results in movement of tectonic plates and decomposition at some places.

Therefore, the heat energy and resultant convection current leads the tectonic plate boundaries and formation of different kinds of rocks which are stimulated by the action of air and water.

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Answer:

im pretty sure it is D

Explanation:

this is an old term for a microscopic organisms that included bacteria, protozoans, and very small animals