please help me do this Qustion

Answer:

A.It is the same for every sample of a single substance.

Explanation:

Since a pH of 3 is three numbers higher than a pH of 6, we can find the change in acidity by taking 10 to the third power. The solution with a pH of 3 is 1000 times more acidic than the solution with a pH of 6.

Answer:

Option B

Explanation:

The name of the molecule is;

1,1,1,3,3,3-Hexachloropropanone

Now, we can see that it contains propanone which is also called acetone. So it will have a double bond with Carbon(C) and Oxygen (O).

Option B has that double bond between C and O that indicates it propanone or acetone.

Thus, it is the correct option.

Answer:

It is a ( on the acellus question )

Explanation:

Answer:

9.00 g H2O

Explanation:

Convert molecules to grams using stoichiometry

(3.01 * 10^23 molecules) * (1 mole H2O / 6.022 * 10^23 molecules) * (18.01 g / 1 mole H2O) = 9.00 g H2O

Answer:

answer  in picture

Explanation:

Answer:

1) C₃H₄N

Explanation:

The empirical formula of a compound is the formula that gives the positive integer ratio of the atoms of the elements in the compound in the simplest form

The mass of carbon in the compound = 90 grams

The molar mass of carbon = 12.011 g/mol

The number of moles of carbon = 90 g/(12.011 g/mol) ≈ 7.4931313 moles

The mass of hydrogen in the compound = 11 grams

The molar mass of hydrogen = 1.00794 g/mol

The number of moles of carbon = 11 g/(1.00794 g/mol) ≈ 10.913348 moles

The mass of nitrogen in the compound = 35 grams

The molar mass of nitrogen = 14.0067 g/mol

The number of moles of carbon = 35 g/(14.0067 g/mol) ≈ 2.49880414 moles

Dividing by the smallest mole ratio gives;

The proportion of carbon, C = 7.4931313/2.49880414 = 2.9987 ≈ 3

The proportion of nitrogen, N = 10.913348 /2.49880414 = 4.367 ≈ 4

The proportion of nitrogen, N = 2.49880414 /2.49880414 = 1

Therefore, the empirical formula of the compound is C₃H₄N.

Answer:

1) C₃H₄N

Explanation:

took test

Answer:

i think it is a the full moon

Answer:

The particle theory states that the particles of a substance spread out as they gain energy when heated. Thus, the particles take up more space, which means that the density of the substance decreases. It is almost always true that, for each pure sub­ stance (for example, gold), the density of its solid state is greater than the density

Explanation:

Answer:

105Comprendes las leyes de la electricidadAprende másClasificación de los materialesUn medio o material que permite el movimiento de las cargas eléctricas (electrones) en respuesta a una fuerza eléctrica, se denomina conductor. Los materiales conductores son los que se pueden electrizar en toda su superficie, debido a que los electrones se mueven libremente. Los metales por lo general son buenos conductores de la electricidad.El flujo de las partículas cargadas es lo que se conoce como corriente eléctrica. Las partículas cargadas en una cierta dirección de un conductor chocan con los átomos, produciendo una pérdida de energía que se manifiesta en forma de calor.Una medida de oposición que presentan las partículas cargadas al moverse libre-mente en una cierta dirección de un material conductor es lo que se conoce como resistencia eléctrica.Los materiales que no permiten que las partículas cargadas se muevan hacia otra región del material a una fuerza eléctrica, son llamados aislantespor ejemplo, la madera.Existen otros tipos de materiales cuyas propiedades son intermedias entre los conductores y aislantes; se llaman semiconductores.Algunos ejemplos de materiales con estas características son:

Explanation:

Answer:

AlI3 is the chemical formula and the name of compound is Aluminium iodide.

Answer:

The molecular mass of carbon dioxide is 44.01amu

Answer:

It improves the texture of the flour

Explanation:

Flour is supposed to have a very fine texture. Commercial flour is not expected to occur in lumps. Lumps reduce the utility of the flour.

Hence, to improve the texture of the commercial flour, it is thoroughly sifted to ensure that there are no large lumps in the flour.This is so important when producing cake flour where the achievement of fine texture is of utmost priority.

Answer:

bR2 since it is nonpolar

Answer:

PLZ FOLLOWING ME.........................

Na2SO4 is not an reaction it is a compound named Sodium Sulfate having molar mass 142 g/mol

Answer: let me see I gotta do the work first then I’ll give you the answers

Explanation:

Answer:

I do. I am in tenth. What area are you in?

Explanation:

Answer:

8th finna be in 9th wbu

Explanation:

Answer:

Solid matter is composed of tightly packed particles. A solid will retain its shape; the particles are not free to move around. Liquid matter is made of more loosely packed particles. ... Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume.\

Answer:

if they are more stable and more still they are solid if they are slitly agitated and move around more then it's a liquid but if they are completely moving fast without any hesitation then it's a gas.

Answer:

not sure o. increasing pressure and decreasing temperature

Answer:

68.81ml

Explanation:

Using the formula:

CaVa = CbVb

Where;

Ca = concentration of acid (M)

Cb = concentration of base (M)

Va = volume of acid (ml)

Vb = volume of base (ml)

Based on the information given in this question;

Ca = 0.545M

Cb = 0.150M

Va = 250ml

Vb = ?

Using CaVa = CbVb

0.545/250 = 0.150/Vb

Cross multiply

250 × 0.150 = 0.545Vb

37.5 = 0.545Vb

Vb = 37.5/0.545

Vb = 68.81ml

Answer:

1.59x10⁻¹⁰m

Explanation:

To solve this question we must know that the length of the cubic cell, X, is equal to:

X = √8 * R

Where R is the atomic radius of germanium

And that in 1 unit cell there are 4 atoms of germanium.

To solve this question we must find the mass in 1 unit cell, with this mass we can find the volume of the cube and the length. With the length we can know the atomic radius:

Mass in 1 unit cell -Molar mass Ge = 72.64g/mol:

4 atoms Ge * (1mol / 6.022x10²³ atoms) = 6.64x10⁻²⁴ moles Ge

6.64x10⁻²⁴ moles Ge * (72.64g / mol) = 4.825x10⁻²²g Ge

Volume unit cell:

4.825x10⁻²²g Ge * (1cm³ / 5.32g) = 9.07x10⁻²³cm³

Length unit cell:

∛9.07x10⁻²³cm³ = 4.49x10⁻⁸cm * (1m / 100cm) = 4.49x10⁻¹⁰m

Atomic radius Ge:

4.49x10⁻¹⁰m / √8 =

Answer:

Number of moles of oxygen used=13.5moles

Explanation:

To know the number of moles of oxygen used, first calculate the molar mass of water.

H2O=(2*1)+(1*16)

=2+16

18g/mol of H2O

The moles of H2O is 7.6 moles

So first, find the molar mass of oxygen

O2=2*16

=32g/mol

Then, number of moles of oxygen is equal to molar mass of oxygen divide by the molar mass of water times the number of moles of water

No. moles of O2=[32g/mol]/[18g/mol] *7.6moles

Moles of O2=1.778*7.6moles

No.moles of O2=13.5 moles

Therefore, the number of moles of oxygen used was 13.5moles

The molar mass of Hg2(NO3)3 is 587.1947 g/mol

My source was wrong.

Answer:

molar mass: 587.1947

Explanation:

Element Symbol Atomic weight Atoms Mass percent

Mercury Hg 200.59 2 68.3215

Nitrogen N 14.0067 3 7.1561

Oxygen O 15.9994 9 24.5225

Answer:

17.2mL are needed

Explanation:

The pH curve for titration of 50.0 mL of a 0.100 M solution of hydrochloric acid

A strong acid as HCl reacts with a strong base as NaOH producing water and a salt. The chemical equation is:

HCl + NaOH → H₂O + NaCl

Where 1 mole of HCl reacts per mole of NaOH

To solve this question we must find the moles of HCl added = Moles NaOH you must add to reach the equivalence point. With these moles and the molar concentration we can find the volume that would be needed as follows:

Moles HCl:

50.0mL = 0.0500L * (0.100moles / L) = 0.00500 moles HCl = Moles NaOH

Volume NaOH:

0.00500 moles NaOH * (1L / 0.290moles) = 0.0172L NaOH =

Answer:

n = Initial volume/22.4L

Explanation:

The molar concept is simply one that is used to find the Number of moles and explain the relationship it has with avogadro's number, molecular mass, molar mass e.t.c.

Now, in terms of molar mass, number of moles is given by the formula;

n = mass of the sample/molar mass

In terms of avogadro's number, number of moles is;

1 mole = avogadro's number = 6.02 × 10^(23)

Now, when dealing with ideal gases, the molar volume of an ideal gas is 22.4 L.

Now the relationship between this volume and the mole concept is that the number of moles is gotten by dividing the initial volume by this molar volume.

Thus;

n = Initial volume/22.4L

Answer:

Same in  all compounds

Explanation:

We know that

mass percentage of N = [mass of N/ mass of compound] ×100

In NO2, N% = 14/(14+32)×100

= 14/46×100

= 30.43%

In, N2O4,  N% = 28/(28+64) ×100 = 28/92×100 =30.43%

Similarly, in N3O6 also the % of N = 30.43%

So, percentage of Nitrogen is same in all given compound. That is 30.43%

Answer:

1. 66.96°C

2. -1776.5J

3. 179.9°C

Explanation:

Using the formula;

Q = m × c × ∆T

Where;

Q = amount of heat (J)

m = mass (g)

c = specific heat capacity (J/g°C)

∆T = change in temperature (°C)

QUESTION 1:

∆T = ?

m = 160g

c = 0.14 J/g°C

Q = 1500 J

1500 = 160 × 0.14 × ∆T

1500 = 22.4∆T

∆T = 1500/22.4

∆T = 66.96°C

QUESTION 2:

Q = ?

m = 85g

c = 0.11 J/g°C

∆T = 10°C - 200°C = -190°C

Q = 85 × 0.11 × -190

Q = -1776.5J

QUESTION 3:

Q = 1404 J

m = 38g

c = 0.24 J/g°C

Final temperature = ?

Initial temperature = 26°C

1404 = 38 × 0.24 × (T2 - 26)

1404 = 9.12 (T2 - 26)

1404 = 9.12T2 - 237.12

9.12T2 = 1404 + 237.12

9.12T2 = 1641.12

T2 = 1641.12 ÷ 9.12

T2 = 179.9°C