how many electrons does Na have

Answer:

d

Explanation:

math

Answer:

The answer is A

Explanation:

Answer:

If a membrane is permeable to water, though not to a solute, water will equalize its own concentration by diffusing to the side of lower water concentration

Explanation:

Answer:a

Explanation:i think its a

Answer:

KCl

Explanation:

Look at the electronegativity differences between the pairs of elements:

KCl: 3.16 - 0.82 = 2.34

BeCl: 3.16 - 1.57 = 1.59

LiCl: 3.16 - 0.98 = 2.18

ClO: 3.44 - 3.16 = 0.28

KCl has the highest electronegativity difference; thus it is the most ionic bond of the 4.

Answer:

b barium and chlorine

Explanation:

chemical bond formed between 2 oppositely charged ions

The percent concentration of the Barium nitrate : 11.33%

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.

[tex]\tt \%mass=\dfrac{mass~solute}{mass~solution}\times 100\%[/tex]

mass solute=mass Barium nitrate(Ba(NO₃)₂)=46 g

mass solvent=mass water=360 g

mass solution=mass solute+mass solvent=46+360=406 g

[tex]\tt \%mass=\dfrac{46}{406}\times 100\%\\\\\%mass=\boxed{\bold{11.33\%}}[/tex]

Answer: CaCl2

Explanation:

Answer:

f

Explanation:

Answer:

#3

Explanation:

Answer:

Explanation:

The number of molecules of Ca2(SO3) can be found by using the formula

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 8.41 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Answer:

Following are the solution to this question:

Explanation:

Please find the complete question in the attached file.

In point a:

When some water evaporates from its mixture, then when a thick layer is initiated, it reduces salt solubility, but sodium remains unclear throughout the solution (ppt solte).  

In point b:

Ksp is measured by calculating the mass of its solvent reduction process, decreasing salt solubility and hence decreasing Ksp.  

In point c:

From of the graph [tex]\Delta \ H \ \ or \ \ \Delta \ S[/tex] are calculated by [tex]\frac{1}{T}[/tex] v/s lnKsp  

(decrease) LnKsp may shift,  

[tex]\Delta \ H = -slope \times R \\\\\Delta \ S = intercept \times R[/tex]

So, both are decreasing

Answer: A composite volcano is the most common type of volcano. They have non-explosion and explosion eruptions. There crater is big, or small. They are also called Stratovolcanoes.

Explanation:

The only thing in nature which can exists in all the three states equally is water. Water can easily interchange between gas , liquid or solid.

There are three states on which matter can exist namely solids, liquid and gas. Solid state of a substance have definite shape, volume and size. In solids, molecules are closely packed and have no space in between to move apart.

In liquids, molecules have some space to move and thus they flow like water thereby have no definite shape but have definite volume. In gases, molecules have negligible intermolecular attraction and thus are far apart. Gas molecules spread over the atmosphere.

Most of the substances are usually exists any one of the state but can converted to other states. However, in nature, water is exists in all the three states as liquid water, water vapor and solid ice

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Answer:

gamma

Explanation:

The type of radiation that is being emitted from the rock is beta radiation.

Alpha particles are positively charged particles that are made up of two protons and two neutrons. They are the least penetrating type of radiation and can be stopped by a sheet of paper.

Beta particles are negatively charged particles that are made up of electrons. They are more penetrating than alpha particles and can be stopped by aluminum foil.

Gamma rays are high-energy photons that are not charged. They are the most penetrating type of radiation and can only be stopped by thick layers of lead or concrete.

In the case of the rock, the radiation is being stopped by the aluminum foil, which means that it must be beta radiation. Beta particles are more penetrating than alpha particles, but they are still not as penetrating as gamma rays. This means that the rock is probably not emitting gamma rays, and the only other possibility is beta radiation.

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Answer: The reaction produces 2.93 g H₂.

M_r:                        133.34  2.016

       2Al + 6HCl → 2AlCl₃ + 3H₂

Moles of AlCl₃ = 129 g AlCl₃ × (1 mol AlCl₃/133.34 g AlCl₃) = 0.9675 mol AlCl₃

Moles of H₂ = 0.9675 mol AlCl₃ × (3 mol H₂/2 mol AlCl₃) = 1.451 mol H₂

Mass of H₂ = 1.451 mol H₂ × (2.016 g H₂/1 mol H₂) = 2.93 g H₂

Explanation:

Answer:

1.44

⋅

10

24

molecules

N

2

Explanation:

Using Avogadro's constant of 1 mole is equal to

6.02810

23

molecules, we can convert moles to molecules.

2.4

m

o

l

N

2

⋅

6.02810

23

m

l

c

s

N

2

1

m

o

l

N

2

2.4

m

o

l

N

2

⋅

6.02810

23

m

l

c

s

N

2

1

m

o

l

N

2

1.44

⋅

10

24

molecules

N

2

This would means that there would be

2.88

⋅

10

24

atoms

N

2

as there are two atoms of Nitrogen in each of the molecules.

Explanation:

Answer:

I would go with A

Explanation:

Because the earths equator is warmed by most direct rays of the sun, air a the equator is hotter than air further north or the south. The hotter air rises up at the equator and as colder air moves in to take its place, the wind begins to blow and push the ocean into waves and currents

Answer:

A

Explanation:

Because the earths equator is warmed by most direct rays of the sun which make it warm and goes up and go to cold and go down to Antarctica and come back up warm because and the most direct rays.

Answer:

2

Explanation:

The principal energy levels for an atom with a ground state electronic configuration is 2;

       K    L

       2    4

Principal quantum number represents the main energy level in which the orbital is located or the average distance of the orbital in the nucleus.

The principal quantum number takes whole number values such; i.e;

             n  = 1, 2, 3, 4, 5

For the given on the principal energy levels are 2.

The total number of occupied principal energy levels in this atom is 2.

The energy levels are the locations where electrons are found and are

usually close to the nucleus. The energy levels 1s and 2s are involved and

occupied in the atom with a electronic configuration of 2-4 in its ground

state.

The 1s energy level has a maximum of 2 electrons which can fill it while the

2s energy level has a maximum of 8 electrons which can fill it.

This is why the total number of occupied principal energy levels in this atom

will be 2.

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Answer:

B spiracles

Explanation:

These are the tubes connected to the openings in their sides

Insects use tiny openings in their body wall called spiracles to get oxygen. They are also called tracheal tubes. Hence, option B is correct.

An insect's inside functions almost like a sponge. Because a sponge has tiny holes that allow water to enter, it becomes moist. Spiracles are similar to this. They allowed oxygen to enter the bug's body. They then release carbon dioxide.

Insects can open and close their spiracles . This is accomplished through certain muscles . To drive oxygen  through their bodies, insects can also contract their muscles. The oxygen inside them is spread out by doing this.

Stomata is the reparatory organ in plants and gills are the organ in aquatic livings for respiration. In mammals lungs are the respiratory organ. Therefore, option B is correct.

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Answer:

liquid atoms are less tightly packed and move faster

Answer:

The answer is C

Explanation:

Answer:

based on texture/ feel, oder/smell, melting/boiling point

Explanation:

Answer:

Smell it, drink it, throw it at someone.

Explanation:

If none of that hurts or kills anyone, you can mark everything that would off the list.

6.79 x 10⁶

Scientific Notation consists of 2 parts  

1. the first part: the first digit followed by the decimal point  

2. The second part: the power of 10 (the exponents).which shows the number of digits after the decimal point  

To add/subtract, the exponents must be the same and then add/subtract the coefficient

[tex]\tt 7.2\times 10^6\rightarrow 72\times 10^5[/tex]

[tex]\tt =(72-4.1)\times 10^5\\\\=67.9\times 10^5\rightarrow 6.79\times 10^6[/tex]

Answer: Radiation is energy given off by matter in the form of rays or high-speed particles. ... Atoms are made up of various parts; the nucleus contains minute particles called protons and neutrons, and the atom's outer shell contains other particles called electrons.

Answer:

Radiation is energy given off by matter in the form of rays or high-speed particles. All matter is composed of atoms. Atoms are made up of various parts; the nucleus contains minute particles called protons and neutrons, and the atom's outer shell contains other particles called electrons.

Explanation:

My mom studies this so, if you have any other questions, feel free to ask me! <3

The percentage of Calcium carbonate in the 2.00 g piece of rock : 45%

Reaction

CaCO₃ + 2HCl ⇒ CaCl₂ +CO₂ + H₂O

V HCL = 36 cm³

M HCl = 0.5 mol/dm³

mol of HCl :

[tex]\tt 0.036~dm^3(36~cm^3)\times 0.5~mol/dm^3=0.018[/tex]

mol ratio CaCO₃ : HCl = 1 : 2, so mol CaCO₃ :

[tex]\tt \dfrac{1}{2}\times 0.018=0.009[/tex]

mass CaCO₃ (MW=100 g/mol) :

[tex]\tt 0.009\times 100=0.9~g[/tex]

The percentage of Calcium carbonate :

[tex]\tt \%mass=\dfrac{mass~CaCO_3}{mass~rock}\times 100\%\\\\\%mass=\dfrac{0.9}{2}\times 100\%=45\%[/tex]

Answer:

Evaporation, conensation, Heat of vaporization, more

Explanation:

im pretty sure this is correct

Answer: create a question.

Explanation: