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Answer:

1 it is rocky

Explanation:

here why because the crust is made of igneous metamorphic and sedimentary rocks

Answer:

See explanation and image attached

Explanation:

Here attached are resonance forms of pyrrole and pyridine. The images were obtained from quora and researchgate respectively.

Now, we can see that in the resonance forms of pyrrole, the nitrogen atom in the heterocycle has a formal charge of +1. However, in the six membered pyridine hetrocycle, the nitrogen atom may have a formal charge of -1 or +1 as shown in the canonical structures attached. The structures in which nitrogen has a +1 formal charge in pyridine are comparable to structures obtained from pyrrole. These structures have less contribution to the structure of pyridine.

Answer:

Because it contains 2 molecules of nitrogen and 3 molecules of oxygen

Explanation:

Answer:

Cl₂(g) + 2 KBr(aq) ⇒ Br₂(l) + 2 KCl(aq)

Explanation:

Let's consider the unbalanced single displacement reaction between chlorine and potassium bromide.

Cl₂(g) + KBr(aq) ⇒ Br₂(l) + KCl(aq)

We will start balancing Cl atoms by multiplying KCl by 2.

Cl₂(g) + KBr(aq) ⇒ Br₂(l) + 2 KCl(aq)

Finally, to get the balanced equation, we have to multiply KBr by 2.

Cl₂(g) + 2 KBr(aq) ⇒ Br₂(l) + 2 KCl(aq)

Answer: Mass of H₂ needed to react with O₂ : 1.092 g

Further explanation

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.

Reaction

O₂(g) + 2H₂(g) → 2H₂O(g)

mass of O₂ : 8.75 g

mol O₂(MW=32 g/mol) :

From the equation, mol ratio of O₂ : H₂ = 1 : 2, so mol H₂ :

Mass H₂ (MW=2 g/mol) :

.546 x 2 = 1.10 g

The term mole concept is used here to determine the mass of hydrogen. The mass of hydrogen is 1.10 g. Thus the correct option is B.

One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:

Number of moles = Given mass / Molar mass

The balanced equation when H₂ reacts with oxygen is:

2H₂ (g) + O₂ (g) → 2H₂O (g)

The molar mass of oxygen is 16.00 g/mol and the given mass is 8.75. Then the number of moles is:

8.75 g / 16.00 g/ mol = 0.546 mol

In the equation 1 mole of 'O' = 2 mole of 'H'

Then 0.546 mol 'O' = 0.546 × 2 mol of 'H' = 1.092 mol

The mass of H₂ needed to react with 8.75 g of O₂ is:

Mass = Number of moles × Molar mass

Here the molar mass of  H₂ is 1.00794 g/mol.

Then the mass is:

1.092 mol × 1.00794 g/mol = 1.10 g.

Thus the correct option is B.

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Answer:

A

Explanation:

Answer:

b

Explanation:

Answer:

The correct answer is 4

Explanation:

Boron trifluoride (BF₃) has a molecular geometry (as shown in the image in the question) referred to as trigonal planar; this is because each of the the fluorine atoms/molecules (bonded to the central boron atom) is placed in such a way that they form the three "end points"/"domains" of an equilateral triangle. Hence, the correct option is the last option.

Answer:

V = 146.87 L

Explanation:

Given data:

Mass of sample = 14.0 g

Pressure of sample = 120 kpa

Volume of gas = ?

Temperature of gas = 30°C

Solution:

Number of moles of gas:

Number of moles = mass/molar mass

Number of moles = 14.0 g/ 2 g/mol

Number of moles = 7 mol

Pressure of gas:

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 8.31 KPa.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

30+273 = 303 K

by putting values,

120 KPa × V = 7 mol × 8.31 KPa.L/ mol.K  × 303 K

V = 17625.51 KPa .L/ 120 KPa

V = 146.87 L

Answer:

2 ch3oh(l) + 3 o2(g)

Explanation:

because they are at the beginning and they are what are being changed.

In the given chemical reaction: [tex]\rm 2 CH_3OH(l) + 3 O_2(g) \rightarrow 2 CO_2(g) + 4 H_2O(g)[/tex], the reactants are [tex]\rm CH_3OH[/tex] and [tex]\rm O_2[/tex], respectively.

Reactants are the starting materials or substances that are consumed in a chemical reaction to produce new products.

The reaction is a combustion reaction, where a fuel (in this case, methanol) reacts with oxygen gas to produce carbon dioxide and water vapor.

[tex]\rm 2 CH_3OH(l) + 3 O_2(g) \rightarrow 2 CO_2(g) + 4 H_2O(g)[/tex]

The starting molecules (reactants) in this reaction is [tex]\rm CH_3OH[/tex] and [tex]\rm O_2[/tex], which reacts to produce [tex]\rm 2 CO_2(g)\ and\ \4 H_2O(g)[/tex] as the final product.

Therefore, [tex]\rm CH_3OH[/tex] and [tex]\rm O_2[/tex] are the reactants in the given chemical reaction, respectively.

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Answer:

Dissolves in water

Explanation:

Answer:

12.

Explanation:

There are 12 atoms within 4 water molecules.

The weight/weight percent(%w/w) of NaCl in  solution : 33.03%

Given

Mole fraction of NaCl : 0.132

Required

The weight/weight percent of NaCl

Solution

1 mol solution : 0.132 mol NaCl + 0.868 mol H₂O

mass NaCl :

[tex]\tt 0.132\times 58.44 g/mol=7.714~g[/tex]

mass H₂O :

[tex]\tt 0.868\times 18.016~g/mol=15.64~g[/tex]

Total mass = 7.714 + 15.64 = 23.354 g

[tex]\tt \%NaCl=\dfrac{7.714}{23.354}\times 100\%=33.03\%[/tex]

Answer:

Carbon dioxide, sunlight, and water.

Explanation:

When light passes from one medium to the other of different density, the light ray will bend. This is called refraction. Light moving from air to water cause refraction. Hence, option d is correct.

Refraction is a phenomenon in which a light ray bent in its direction when passing from one medium to the other where the mediums have different densities.

The measure of bending of light in a medium is called refractive index of that medium. It depends on the density as well as velocity of light through the medium.

For example, when light passes from air to water or air to glass it bends. We can clearly observe the bending in the light ray at the boundary of the two mediums. Hence, option D is correct.

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The options of your question were as follows:

A.  traveling through a vacuum B. passing from one glass block to another C. moving through the air D. moving from air to water.

Answer:someone answer 4 b

Explanation:

123

Answer:

Any situation that has a path that stops at the same position that it started from has a displacement of zero.

Explanation:

Answer:

As long as they end in the same position as they started in they are considered to have a displacement of zero.

Explanation:

ily

Answer:

If you are meaning O2^2- ion, well, don’t forget that ions have a charge, that has to be specified when referring to them. It is a polyatomic ion just because it consists of more than one atom, irrespective of the fact that these atoms are of the same element or not. It was given that name because at the early times chemistry was founded as a science, it was found that with respect to other oxygenated substances, peroxides contained more oxygen than expected: Latin prefix per- gives the terms it is attached to the meaning of being increased, enhanced, and similar.

Explanation:

Answer:

5.85 x 10⁻² mol Au

Explanation:

Divide the atoms of gold with Avogadro's number to find the solution.

Explanation:

bro the given address to subscribe and vaccine aur bhi

Answer:

measuring the consumption of the products and the rate of conversion of products to reagents

Explanation:

It must be taken into account that the reaction rate also depends on the presence of a catalyst, since these advance the rate of the reaction.

Answer:

E) M-18

due to the loss of water

Answer:

i dont uderstand collage

Explanation:

tough

Answer:

1. increase higher   2. it would be decreased.

Explanation:

Answer:

+1

Explanation:

Na₂O₂

NOTE: the oxidation number of oxygen is always –2 except in peroxides where it is –1.

Thus, we can obtain the oxidation number of sodium (Na) in Na₂O₂ as illustrated below:

Na₂O₂ = 0 (oxidation number of ground state compound is zero)

2Na + 2O = 0

O = –1

2Na + 2(–1) = 0

2Na – 2 = 0

Collect like terms

2Na = 0 + 2

2Na = 2

Divide both side by 2

Na = 2/2

Na = +1

Thus, the oxidation number of sodium (Na) in Na₂O₂ is +1

Answer:

its just a chromosome getting ready to split in a cell, Its called the telophase and its copying itself for the mother and daughter cell

i think its B ........

Answer:

= - 59.7 kJ/mol

Explanation:

The total volume of the solution is:

= (100 + 100 ) mL

= 200 mL

mass of the solution = 200 × 1.00 = 200 g

Heat gained by the solution:

= mass × specific heat × temperature change in solution

= 200× 4.184 × (25.3 - 24.6)

= 585.76 J

Heat gained by calorimeter

= heat capacity × change in temperature of caiorimeter

= 15.5 × (25.3 -24.6)

= 10.85 J

Thus, total heat released = total heat gained

= 585.76 + 10.85 J

= 596.61 J

The no of moles of AgNO3 = 100/1000 × 0.100 = 0.01 mol

The no of moles of NaCl = 100/1000 × 0.200 = 0.02 mol

From above, it is obvious that AgNO3 is the limiting reagent

∴

ΔH_{rxn} = total heat released/ moles of AgNO3

= -596.61/0.01

= 59661 J/mol

= - 59.7 kJ/mol

Answer:

i would also like to know

Explanation:

plz..............................................

Answer:

O is the only 3lement that is unbalanced

Answer:

The answer is: Only the Ois unbalanced.

Explanation:

I took the test