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Select the correct answer.
A compound has an empirical formula of CzHs. What is true about this empirical formula?
O A.
It models the structure of the compound.
OB
It shows the ratio of elements in the compound.
O c. It gives the mass of each atom in the compound.
OD.
It indicates the number of atoms in the compound.
OE.
It describes only this one compound.
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Answer:

b

Explanation:

reverse the first reaction

multiply the second by 5

multiply the third by 3

3244.8-1967.5-1450.5=-173.2

Answer:

burning wood be a chemical change because it wouldn’t be able to go back to its original form. A physical change would be a broken pencil. The pencil is still a pencil, it’s just a physical change.But if it were burned it would be a chemical change.

Explanation:

Answer:

The reaction given is  

Chemistry homework question answer, step 1, image 1

Since in equilibrium constant expression, the concentration of liquid components is not written.

Hence the equilibrium constant expression for the above reaction can be written as  

Chemistry homework question answer, step 1, image 2

where [NO] = equilibrium concentration of NO

[NO2 ] = equilibrium concentration of NO2

[HNO3 ] = equilibrium concentration of HNO3

Step 2

Given : mass of NO at equilibrium = 18.6 g

mass of NO2 at equilibrium = 15.1 g

and mass of HNO3 at equilibrium = 13.1 g

Since molar mass of HNO3 = 63 g/mol, molar mass of NO = 30 g/mol and molar mass of NO2 = 46 g/mol

Hence the moles of gases at equilibrium are

Chemistry homework question answer, step 2, image 1

Step 3

Since mass of solution = mass of HNO3 + mass of water = 13.1 + 234.8 = 247.9 g

Assuming density of solution = density of water = 1.00 g/mL

=> mass of solution = volume of solution X density of solution  

=> 247.9 = 1.00 X volume of solution  

=> volume of solution = 247.9 mL = 0.2479 L      

Explanation:

Answer:

? more info

Explanation:

Give users an example of the reactions you've learned about so we can have more of an idea. I'd be glad to help, if you edited your answer, meanwhile I too have homework in need of finishing.

Answer: Its acceleration is -5 meters/second2.

Explanation:

.Answer:

2kclo3 --> 2kcl + 3o2 is a decomposition reaction because it is breaking apart (thinks decompose- to break apart/down)

H2 + I2 --> 2HI is a synthesis reaction because synthesis is like creation/ building

think DNA synthesis or the book of genesis in the bible about creation

2 Na + 2 H20 --> NaOH + H2 --- not balanced at all

other one is a balanced equation- the Zn + 2HCl one

Explanation:

Answer: n= 3, l= 0 , m= 0 and s=[/tex]\frac{-1}{2}[/tex]

Explanation:

Principle Quantum Numbers : It describes the size of the orbital and the energy level. It is represented by n. Where, n = 1,2,3,4....

Azimuthal Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...

Magnetic quantum number :  It describes the orientation of the orbital. It is represented as 'm'. The value of m ranges from -l to +l.

Spin quantum number:  It describes the spin of the electron. It is represented as 's'. The value of s can be +1/2 or -1/2

[tex]F^{2-}:11: 1s^22s^22p^63s^1[/tex]

[tex]F^{3-}:12:1s^22s^22p^63s^2[/tex]

Thus electron enters 3s orbital , thus n= 3, l= 0 , m= 0 and s=[/tex]\frac{-1}{2}[/tex]

Answer:

Synthesis Reaction

Explanation:

Here we see H2 and O2 are being combined H2O. Synthesis reactions are where we see a combination to make a single product.

So here it'd be A + B =AB

2Na(s)+Cl2(g)→2NaCl(s)

Decomposition would be the break down of a compound into 2, the opposite of synthesis.

AB = A + B

2HgO(s)→2Hg(l)+O2(g)

Single replacement is where  1 element replaces another in a reaction, or switches place with 1 element.

AY + B = A + BY

2 HCl(aq) + Zn(s) → ZnCl2(aq) + H2(g)

Double replacement is similar but 2 elements are switch/replaced.

AY + BX = AX + BY

CuCl2(aq) + 2 AgNO3(aq) → Cu(NO3)2(aq) + 2 AgCl(s)

Answer:

Explain:- 22.4L Imol Page 10 Many gas law problems involve calculating the volume of a gas produced by the reaction of volumes of other gases. The problem solving strategy that we have used throughout your chemistry course is still the same. 10.

The volume would 9.23 moles of oxygen gas occupy at 825 mmHg and 45 C 22.4L.

According to the Ideal Gas Law, all gases contain the same number of molecules at the same temperature, pressure, and volume (but not the same mass).

When the temperature and pressure are close to the point of transforming into a liquid or solid, the Ideal Gas law does not apply.

There are four governing assumptions for a gas to be "ideal": The volume of the gas particles is insignificant. The gas particles are all the same size and have no intermolecular forces with one another. According to Newton's Laws of Motion, the gas particles move at random.

Given :

Volume = ?

Number of moles = 9.23 moles

Temperature = 318K

Pressure = 825 mmHg = 1.08 atm

By an ideal gas equation

PV = nRT

V = nRT/ P

= 9.23 × 0.0821 × 318 /  1.08

= 22.4L

Thus, The volume would 9.23 moles of oxygen gas occupy at 825 mmHg and 45 C is 22.4L.

To learn more about an ideal gas law, follow the link;

https://brainly.com/question/28257995

#SPJ6

Calculation: Molar mass of water = 180 % of water = > 180/286*100 = > 62.93%.

Answer: the percent by mass of water in the hydrate Na2CO3.10H20 is 62.93%.

Answer:

Magnetic susceptibility is the degree to which a material can be magnetized in an external magnetic field. If the ratio between the induced magnetization and the inducing field is expressed per unit volume, volume susceptibility (k) is defined as.

Explanation:

good luck

The standard cell potential of this reaction is obtained from the calculations as 3.21 V

An electrochemicall cell is onee in which electrical energy is produced from a chemical reaction. A cell reaction is sponteanous of the standard cell potential is positive.

Now;

E∘cell = E∘cathode - E∘anode

E∘cathode = 0.34 V

E∘anode = (-2.87 V)

E∘cell = 0.34 V - (-2.87 V) = 3.21 V

Learn more about electrode potential: https://brainly.com/question/11256472?r

Answer:

Explanation:  Ethanol, CH3CH2OH, has the highest of the three boiling points because it has the strongest dipole–dipole forces between molecules due to hydrogen bonding. ... Dimethyl ether, CH3OCH3, has the second- highest boiling point because it has dipole–dipole forces between molecules.

Answer:

False.

Explanation:

The given statement asserts a false claim because the equator is the region that receives maximum sunlight. The equator is placed right below the sun and thus, it tends to receive the maximum radiation across the year. While the poles are the coldest regions of the Earth because due to Earth's titled axis, they receive very few sun rays for a certain time of the year. Thus, if we move away from the equator, we are likely to receive less radiation from the sun as the sun keeps getting farther while moving away from the equator.

Answer:

hydrophobic: tending to repel or fail to mix with water.

hydrophylic​: having a tendency to mix with, dissolve in, or be wetted by water.

Hope it helps!!!

Answer:

Sea breeze moves from the areas of higher pressure on the water in the direction of the areas of lower pressure on land.

Explanation:

Sea breeze moves from the areas of higher pressure on the water in the direction of the areas of lower pressure on land. Whereas, land breeze blows from the areas of higher pressure on land to the areas of lower pressure on water.

Answer:

endothermic reactions

Explanation:

Endothermic reactions are those reactions that absorbs heat from the surroundings as opposed to the exothermic reaction that releases heat energy. This heat absorption that characterizes endothermic reactions causes the surrounding to be cool.

However, in an endothermic reaction, more energy is needed to be absorbed in order to break the bonds of the reactants to form products, hence, making the activation energy of endothermic reactions HIGHER.

Answer: The final pressure is 116kPa or [tex]116kN/m^2[/tex]

Explanation:

The combined gas equation is,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = [tex]250kN/m^2=250kPa[/tex]   [tex](1kN/m^2=1kPa)[/tex]

[tex]P_2[/tex] = final pressure of gas = ?

[tex]V_1[/tex] = initial volume of gas = v ml

[tex]V_2[/tex] = final volume of gas = [tex]1.8\times v=1.8vml[/tex]

[tex]T_1[/tex] = initial temperature of gas = [tex]75^0C=(75+273)K=348K[/tex]

[tex]T_2[/tex] = final temperature of gas = [tex]18^0C=(18+273)K=291K[/tex]

Now put all the given values in the above equation, we get:

[tex]\frac{250kPa\times v}{348}=\frac{P_2\times 1.8v}{291}[/tex]

[tex]P_2=116kPa[/tex]

The final pressure is 116kPa or [tex]116kN/m^2[/tex]

Answer:

think I did this before and its V

Answer:

pressure must remain constant

Explanation:

charles law= V/T

where pressure remains constant

If Charles' law is to be applied to a given sample of a gas, then it must have constant pressure.

Gas law are the hypothesis which tells about the behavior of gas at different conditions.

According to the Charles' Law, volume of the gas at any constant pressure and no. of moles of gas is directly proportional to the temperature of the gas at that condition. Charles' law is represented as:

V ∝ T, where

V = volume of gas

T = temperature of gas

Hence option (a) is correct i.e. pressure.

To know more about Charles' Law, visit the below link:

https://brainly.com/question/26725812

Li2O

Fe(NO3)3

Al2O3

CuCl2

ZnSO4

All you have to do here is make sure your charges are balanced when you write the compound. For example, Iron (III) has a +3 charge, and nitrate has a -1 charge. You need 3 nitrates to match that charge, hence Fe(NO3)3.

Answer:

NO

Explanation:

Water and N₂ cannot be the answer because they are products of the reaction, not reactants.

The fact that some ammonia (NH₃) is left in the container once the reaction is finished tells us that NH₃ is the reactant in excess.

The remaining reactant is thus the limiting reactant. The correct answer is NO.

Answer:

Chemical property is a characteristic of a particular substance that can be observed in a chemical reaction.

Explanation:

Hope this helps :)

Answer:

A chemical property is any of a material's propertiesthat becomes evident during, or after, a chemicalreaction; that is, any quality that can be established only by changing a substance's chemical identity. ... They can also be useful to identify an unknown substance or to separate or purify it from other substances.

Answer:

A -  Nitrile compound

B-   AlkylAmine

C-   Alcohol

D -  Alkene

Explanation:

(A) undergoes reduction to form alkylamine.

(B) is a primary alkyl amine which on carbylamine test gives a foul smell.

(B) reacts with NaNO2 + HCl undergoes diasotisation following which alcohol is produced.

(C) being a alcohol undergoes hydrolysis to give alkene.

(D) On further reaction with H2S04 by the rule of Markownikoff rule it forms a isomer of (C).

Answer:

615 g

Explanation:

In order to convert from moles of any given substance into grams, we have to use said substance's molar mass, as follows:

Thus, we now calculate the molar mass of beryllium iodide, BeI₂, using the molar masses of the elements:

Finally we calculate how many grams are there in 2.34 moles of BeI₂:

Answer:

1.4 M

Explanation:

n(HBr)=3.115/81

so, 3.115/81=0.0385mol

according to the reaction, n(HBr)=n(KOH)=0.038 mol

C(KOH)=n/V=0.0385/0.02745

0.0385/0.02745 =1.4 M

in short the answer is 1.4 M (molarity)

Explanation:

c . produces bile is not the function of slaiva

Answer:

B. partially digests starch