ﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺ

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: 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:

Answer: True

Explanation:

Q. 10g of white powder reacts with 10g of clear liquid. The reaction bubbles and changes color producing a black liquid that has a mass of 13g. What can be ...

When 10 g of a solid chemical reacts with 10 g of a liquid chemical, the reaction bubbles and the liquid changes color. The coloured liquid has a weight of 13 g. This can be said. The produced gas weighed 7 g.

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Answer:

The answer is A

Explanation:

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:

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:

liquid atoms are less tightly packed and move faster

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]

What you already know:

C on this diagram is a proton and B points to the electron. A note the nucleus that contains the protons and the center of orbit to the electrons. D notes the electron cloud, radius, or the bounds to which the electron obitals exist.

Answer:

If you count the number of protons this atom has it adds up to 3, which, therefore comfirms that this molecule is Li. The number of protons is specific to the atom. The question states that this element has a mass number of 7, this is because the mass number is the sum of both protons and electrons.

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:

f

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:

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:

Option A. Add one green candy

Explanation:

From the question given above, the following data were obtained:

Red color => Proton

Green => Neutron

Blue => Electron

Isotopy is a phenomenon where by two or more elements have the same atomic number by different mass number due to the difference in the neutron number. The atoms involved are called isotopes.

From the above definition, isotope exist when the neutron number of the atoms are different with each having same atomic number (i.e proton number).

Thus, considering the question and the options given above, the only way to make a different isotope of oxygen is to add a green candy (i.e neutron).

Answer:

d

Explanation:

math

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:

1.Because my coffee was too cold, I heated it in the microwave.

2. Although he was wealthy, he was still unhappy.

3. She returned the computer after she noticed it was damaged.

Explanation:

..

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:

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

the total number of protons and neutrons in a nucleus

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

Answer: CaCl2

Explanation:

Answer:

#3

Explanation:

Answer:

The answer is C

Explanation: