what is the oxidation number of cesium in Cs2Cr2O7

Answer:

b. the type of container

Explanation:

Answer:

The type of container

Explanation:

Just took the test

Answer:

- 0.454 °C

Explanation:

From the given information:

The mass of KCl = 10 grams

The molar mass of KCl = 74.55 g/mol

The molality can be calculated as:

[tex]Molality \ m = \dfrac{mass \ of \ KCl \times 1000}{molar \ mass \ of \ KCl \times 1100.0}[/tex]

[tex]Molality \ m = \dfrac{10 \ g \times 1000}{74.55 \ g/mol \times 1100.0}[/tex]

Molality m = 0.1219 M

For freezing point depression;

[tex]\Delta T_R = i \times k_f \times m[/tex]

The van't Hoff's Factor (i) for KCl  = 2

The molar depression of freezing point constant [tex]k_f[/tex] = 1.86° C/m

∴

[tex]\Delta T_R = 2 \times 1.86 \times 0.1219[/tex]

[tex]\mathbf{\Delta T_R = 0.454^0\ C }[/tex]

However, the freezing point of water is known to be = 0°C

Therefore, the freezing point of the solution

= 0 °C - 0.454 °C

= - 0.454 °C

Answer:

Covalent bond involves the sharing of electrons, while metallic bonds have strong attractions and ionic bonds involve the transferring and accepting of electrons from the valence shell. The adhering property of an atom, in order to arrange themselves in a most stable pattern by filling their outermost electrons orbit

Explanation:

hope it helps:)

Answer:

x = 33.52 amu

Explanation:

It is given that,

Isotope A has a mass of 34 amu and an abundance of 52%, isotope B has a mass of 33 amu and an abundance of 48%.

Let x is the average atomic mass of this element. It can be calculated as follows :

[tex]x=52\%\ \text{of}\ 34+48\%\ \text{of}\ 33\\\\x=\dfrac{52}{100}\times 34+\dfrac{48}{100}\times 33\\\\x=0.52\times 34+0.48\times 33\\\\x=33.52\ \text{amu}[/tex]

So, the average atomic mass of this element is 33.52 amu.

Answer:

PH = 4.0

Explanation:

We are given;

Ka1 = 8.9 × 10^(-8)

Ka2 = 1.0 × 10^(-19)

From the 2 values of K given above, we can see that Ka2 is far smaller than Ka1.

Thus, Positive hydrogen ion (H+) will be majorly formed from first dissociation which is Ka1.

Now, the breakdown of the H2S solution is;

H2S⇌[H+] + [HS−]

Thus;

Ka1 = [[H+] × [HS2^(-)]]/(H2S)

HS2^(-) also has a positive hydrogen ion.

Thus, we can rewrite as;

Ka1 = [[H+] × [H+]]/(H2S)

Ka1 = (H+)²/(H2S)

Concentration of H2S is given as 0.1M. Thus;

8.9 × 10^(-8) = (H+)²/0.1

(H+)² = 0.1 × 8.9 × 10^(-8)

(H+) = √(0.1 × 8.9 × 10^(-8))

(H+) = 0.00009433981

Now, PH is gotten from;

PH = -log (H+)

Thus;

PH = -log 0.00009433981

PH ≈ 4.0

Answer:

500 mL graduated cylinder (±1mL)

Explanation:

Several laboratory glasswares are used in the laboratory, which serves different functions. They include: beakers, volumetric flask, Erlenmeyer flask etc. Beakers are flat-based glasswares used majorly for storing and mixing chemical solutions. Some beakers are also used to measure liquids.

However, graduated cylinders are tall flasks that has graduated markings on it, hence, it is majorly used for measuring liquids. According to this question, a student wants to get a precise and accurate measure of the actual volume of acetone liquid, which is about 250mL.

To do this, the best instrument she can use is a 500 mL graduated cylinder (±1mL). This is because the graduated cylinder holds enough space to contain the liquid and measure it with a level of accuracy better than beakers.

Answer:

POCl3

Explanation:

A compound is a substance made up of atoms of different elements. The number of atoms each element posseses make up the chemical formula of the compound. In this question, a certain compound is made up of three chlorine atoms (Cl3), one phosphorus atom (P), and one oxygen atom (O).

Combining these atoms of different quantity together, this means that the compound will have a chemical formula: POCl3. This compound is called phosphorus oxychloride.

Answer:

[tex]5.412*10^{23}[/tex]

Explanation:

We can find the moles of lithium by doing 0.0624 divided by the molar mass of lithium (which is 6.941). Then, we can multiply that number by 6.02*10^23 which is the avogadro number. Then, we get our answer.

Answer:

O2

Explanation:

A compound is made of two or more chemical elements. With that in mind, O2 is only one element: oxygen.

Answer:

D. O2

Explanation:

First, let’s define a compound.

A compound is a substance made when 2 or more elements are chemically combined in a fixed ratio.

Now, let’s examine the answer choices.

A. NaCl

• This has sodium (Na) and chlorine (Cl) so it is a compound.

B. N2O

• This has nitrogen (N) and oxygen (O). This is a compound.

C. CO2

• This has carbon (C) and oxygen (O) so this is also a compound.

D. O2

• This only has oxygen (O). A compound needs two or more elements, so this is not a compound.

Therefore, the correct answer is D. O2

Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore, value of the gas constant R is 0.0821LatmK⁻¹ when volume is 0.0413 L.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of nitrogen gas = 0.991 atm

V= volume of nitrogen gas =0.0413 L

n =number of moles of nitrogen gas = given mass ÷Molar mass

                                                          =0.0451 g ÷28

                                                          =0.0016mol

T =temperature of nitrogen gas =298 K

R = Gas constant =?

0.991 atm×0.0413 L=0.0016×R×298 K

R=0.0821LatmK⁻¹

Therefore, value of the gas constant R is 0.0821LatmK⁻¹.

To learn more about ideal gas equation, here:

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Answer:

MO = 20

Explanation:

Given that: MO = 3x + 5

                  MN = 2x + 3

                  NO = 2x - 3

But,

MO = MN + NO

So that;

3x + 5 = (2x + 3) + (2x - 3)

3x + 5 = 2x + 3 + 2x - 3

3x + 5 = 4x

3x - 4x = -5

-x = -5

Multiply through by minus,

x = 5

Thus,

MO = 3x + 5

      = 3(5) + 5

      = 15 + 5

MO = 20

The length of MO is 20.

Answer:

as much as i can see i think it goes like this?:

1.H202--> H20+02

Answer is 2,2,1 bc

1.when you add 2 to H202 its 2H202 so H is 4 and O is 4,

2.when you add 2 to H20 its 2H20 so H is 4 and O is 2 (so H is done and good on both sides we have 4 H)

3. and then when you add 1 to O2 its still O2 you dont need to add anything bz when you add the 2O from 2H2O with O2 its 4 O so everything's good (i explained it a bit messy so you can message me if you got questions)

2. Ag20->Ag+ O2

answer is 2,4,1

1.when you add 2 to Ag2O2 it becomes 2Ag2O (so Ag is 4 and O is 2)

2. you add 4 to Ag bc on the left side when you added 2 Ag became 4 so now its equal on both sides (they're both 4)

3.you add 1 (basically dont add anything bc you dont write 1 just leave it as O2) bc on left side you got O2 and the same on right side (if you got questions message me:))

Answer:

I'm sorry to say but there is no statements in this question meaning no one will be able to answer them with out them.. what are the statements?

Explanation:

Answer:

Water lost per day will be "378 g".

Explanation:

The volume of air expired per a day will be:

= [tex]12\times 500[/tex]

= [tex]8640 \ L[/tex]

As we know,

The ideal gad law equation will be:

⇒ [tex]PV = nRT[/tex]

⇒ [tex](\frac{47}{760} )\times 8640= n\times 0.082\times 310[/tex]

⇒ [tex]n=21\times 18[/tex]

⇒ [tex]n=378 \ g[/tex]

Answer:

See explanation

Explanation:

The organic layer is always found at the top of the mixture while the aqueous layer is found at the bottom of the mixture.

Therefore, if I use any piece of rod and an empty container found in the kitchen to perform a simple decantation, the top layer that comes out first is the organic layer. The other layer that remains after the top layer has been successfully decanted is the aqueous layer.

Answer:

Because both carbon and oxygen are demanded to obey the octet's rule.

Explanation:

Hello.

In this case, recalling the Lewis dot structure of CO₂ which is basically:

[tex]O:=:C:=:O[/tex]

We know oxygen has six valance electron whereas carbon four valence electrons, it means that oxygen needs two electrons in order to attain eight electrons and carbon needs four electrons for the same purpose. In such a way, as carbon dioxide contains one carbon atom and two oxygen atoms we infer that each oxygen is providing two electrons for a total of four to allow the carbon obey the octet as well as oxygen and this is attained via two double bonds.

Best regards.

Answer:

Ion

Explanation:

Answer:

Conclusión. Los cationes son iones con carga positiva que se forman cuando los átomos neutros pierden electrones; los aniones son iones con carga negativa que se forman cuando átomos neutros ganan electrones.

Explanation:

Answer:

See explanation

Explanation:

∆H is known as the change in enthalpy. When the change in enthalpy is negative, it simply means that heat is given out during the reaction. Therefore, we refer to the reaction as an exothermic reaction.

Similarly, ∆G is known as change in free energy. When the change in free energy is negative, it implies that the reaction is spontaneous as written. This is called an exergonic reaction.

There's no question..

Answer:

When the thermometer was placed next to the skin, it should be higher because of the heat your body gives off, and the jacket trapping the heat in, when you put it in the closet it will be cooler due to not having a heat source.

Answer:

3 x 10²⁴ molecules

Explanation:

A mole is just a name that we use to substitute a number, just like a dozen means 12, a mole means 6.022 x 10²³. This gives us the unit conversion of 6.022 x 10²³ molecules SO₂/1 mol SO₂.

[tex]5molSO2*\frac{6.022 x 10^2^3molecules}{1mol SO2} = 3.011 x 10^2^4moleculesSO2[/tex]

Round to the lowest number of significant figures to get 3 x 10²⁴ molecules SO₂

Answer:

I think option D

I hope my answer is helpful to you

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Answer:

Mass of glucose = 515.34 g

Explanation:

We are given;

Mass; m = 60 kg

Elevation; h = 1550 m

Acceleration due to gravity; 9.8 m/s²

Now, work performed to lift 60kg by 1550m is given by the formula;

W = mgh

W = 60 × 9.8 × 1550

W = 911400 J

We are told the actual work is 4 times the one above.

Thus;

Actual work = 4W = 4 × 911400 = 3,645,600 J

Now,

Molar mass of Glucose(C6H12O6) = 180 g/mol

We are given standard enthalpy of combustion = -1273.3 KJ/mol = -1273300

Moles of glucose = 3645600/1273300 = 2.863mol

Mass of glucose = 2.863 mol × 180 g/mol

Mass of glucose = 515.34 g

Answer:

Kinetic Energy is the correct Answer.

Explanation:

At the highest point on the roller coaster (assuming it has no velocity), the object has a maximum quantity of gravitational potential energy. As the object begins moving down to the bottom, its gravitational potential energy begins to decrease and the Kinetic Energy starts to increase.

Answer:

The temperature of the objects involved.

Explanation:

In order to know whether thermal energy will occur, it is important to consider the temperature of the objects involved.

"Heat" is normally being transferred from an object that is warmer to an object that is cooler. For example, a lighted candle will transfer its heat to a cooler object lying next to it. This is because the molecules in the lighted candle have higher kinetic energy, which means the molecules are moving fast and are colliding with each other. Thus, it is easier for the molecules to transfer to the area with cooler temperature.

This difference in temperature is essential in order for the thermal energy transfer to occur.

The branch of science which deals with chemicals and its bond is called chemistry.

The correct answer to the question is temperature.

"Heat" is normally being transferred from an object that is warmer to an object that is cooler and this property is known as heat transferring.

This is because the molecules in the lighted candle have higher kinetic energy, which means the molecules are moving fast and are colliding with each other. Thus, it is easier for the molecules to transfer to the area with a cooler temperature.

This difference in temperature is essential in order for the thermal energy transfer to occur.

For more information, refer to the link:-

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Within a period, the atom size decreases with increasing group number (from left to right), since the nuclear charge and the number of external electrons increase within the period, but the number of shells does not. The electrons are more strongly attracted to the nucleus and are therefore closer to the nucleus.