PLEASEEEE PLEASE HELP MEEEE... i begg you

Answer:

Back away from the situation and tell the supervisor/teacher

Answer:

²³⁰₉₀Th

Explanation:

X  →  ²²⁶₈₈Ra  +   ⁴₂He

The given equation shows the alpha emission. When He particle emit the original atom convert into the atom having mass number less than 4  and atomic number less than 2 as compared to parent atom the starting atom.  It means the parent atom is  ²³⁰₉₀Th.

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4  and atomic number less than 2 as compared to parent atom the starting atom.

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

₉₂U²³⁸   →   ₉₀Th²³⁴  + ₂He⁴  + energy

Answer:

[tex]\Delta s=-23.0\frac{J}{mol*K}[/tex]

Explanation:

Hello!

In this case, since the entropy change when an ideal gas undergo both a volume and temperature change is computed by:

[tex]\Delta s =Cp*ln(\frac{T_2}{T_1} )-R*ln(\frac{P_2}{P_1} )[/tex]

Whereas the molar Cp is 20.786 J/(mol*K) and the final pressure is computed via the Boyle's law:

[tex]P_2=\frac{1.00atm*500cm^3}{50cm^3}=10 atm[/tex]

Thus, we plug in the data (temperatures in Kelvin) to obtain:

[tex]\Delta s =20.786\frac{J}{mol*K} *ln[\frac{(-25+273)K}{(25+273)K} ]-8.3145\frac{J}{mol*K}*ln(\frac{10atm}{1atm} )\\\\\Delta s=-23.0\frac{J}{mol*K}[/tex]

Best regards!

Answer:

1943.1 moles

Explanation:

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

Volume (V) = 50200 L

Temperature (T) = 25 °C

Pressure (P) = 720 mmHg

Number of mole (n) of H₂ =?

Next, we shall convert 25 °C to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

Temperature (T) = 25 °C

Temperature (T) = 25 °C + 273

Temperature (T) = 298 K

Next, we shall convert 720 mmHg to atm. This can be obtained as follow:

760 mmHg = 1 atm

Therefore,

720 mmHg = 720 mmHg × 1 atm / 760 mmHg

720 mmHg = 0.947 atm

Thus, 720 mmHg is equivalent to 0.947 atm

Finally, we shall determine number of mole of Hydrogen gas, H₂, needed to fill the balloon as follow:

Volume (V) = 50200 L

Temperature (T) = 298 K

Pressure (P) = 0.947 atm

Gas constant (R) = 0.0821 atm.L/Kmol

Number of mole (n) of H₂ =?

PV = nRT

0.947 × 50200 = n × 0.0821 × 298

47539.4 = n × 24.4658

Divide both side by 24.4658

n = 47539.4 / 24.4658

n = 1943.1 moles

Answer:

28). 261

29). 788

30).-6201

Explanation:

I just took lesson and it said those were correct, I added screenshots of the lesson if you need it :)

Answer: What types of bonds exist between the atoms in a molecule of sodium sulfate, Na2SO4 ? The formula for this compound can be written as [Na+]2[SO42-], the sulfate anion is formed by covalent bonding between sulfur and oxygen. Since there is a bond polarity to a S-O bond these are polar covalent bonds.

Explanation:

The sulphate anion is created via covalent interaction between oxygen and sulphur, and the formula to this chemical is [[tex]Na^+[/tex]][[tex]SO_4^{2-}[/tex]]. These S-O bonds constitute polar covalent bonds because they have a bond polarity.

A polar bond represents a particular type of covalent bond in general. It is also the point at which an ionic bond and an unadulterated covalent bond begin to form, according to another definition. A polar covalent bond, on the other hand, is a link that occurs between two atoms and is made up of electrons which are scattered unevenly if we would like to explain it more precisely. The molecules have a tendency to have an electrical dipole moment in which the two ends are slightly either positive or negative as a result of this condition. The sulphate anion is created via covalent interaction between oxygen and sulphur, and the formula to this chemical is [[tex]Na^+[/tex]][[tex]SO_4^{2-}[/tex]]. These S-O bonds constitute polar covalent bonds because they have a bond polarity.

To know more about polar covalent bond, here:

https://brainly.com/question/28295508

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Answer:

1.47 g

Explanation:

Answer: True

Explanation: I have done this before but I hope this helps.

Answer:

There are 65.38 grams are in 0.75 moles of zinc?

We assume you are converting between moles Zinc and gram. You can view more details on each measurement unit: molecular weight of Zinc or grams The molecular formula for Zinc is Zn. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Zinc, or 65.38 grams.

Answer:

Calcium

Explanation:

Calcium is the only metal here

hope this helps...

A positive ion is an atom or a molecule that has a net positive charge. The charge of the proton in an atom or a molecule is positive.

A subatomic found in the atom or the molecule that lacks a positive charge is called an electron.

The correct answer is:

Option C. Calcium

This can be explained by:

Calcium is the only metal found in the given list and hence is the answer.

To learn more about electrons, protons and metals follow the link:

https://brainly.com/question/21940587

Answer:

528.25 Calories

Explanation:

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

Energy in Joules = 2210.20 J

Energy in calories =?

We can convert 2210.20 J to calories by doing the following:

4.184 J = 1 cal

Therefore,

2210.20 J = 2210.20 J × 1 cal / 4.184 J

2210.20 J = 528.25 Calories

Thus, 2210.20 J is equivalent to 528.25 Calories.

Answer:

1/4

Explanation:

From the question given above, the following data were:

Original amount (N₀) = 100 g

Time (t) = 24.8 h

Fraction remaining =?

NOTE: The half-life of K–42 is 12.4 h

Next, we shall determine the number of half-lives that has elapse. This can be obtained as follow:

Time (t) = 24.8 h

Half-life (t½) = 12.4 h

Number of half-lives (n) =?

n = t / t½

n = 24.8 / 12.4

n = 2

Finally, we shall determine the fraction remaining. This can be obtained as follow:

Number of half-lives (n) = 2

Fraction remaining =?

Fraction remaining = 1/2ⁿ

Fraction remaining = 1/2²

Fraction remaining = 1/4

Answer:

7 dots

Explanation:

Answer:

9.48 L.

Explanation:

Hello!

In this case, as the problem mentions a long way to solve it, we are going to apply it because it can provide the answer more rapidly; thus, considering that 112 km are required, 1 mile equals 1.609 km and 1 gallon equals 3.785 liters, we can set up the proportional factor as shown below:

[tex]112km*\frac{1mi}{1.609 km}*\frac{1gal}{27.8mi}*\frac{3.785L}{1gal}[/tex]

Whereas km, mi and gal are cancelled out as it turns out in L; therefore the required liters are:

[tex]9.48L[/tex]

Best regards!

Answer:

Number of protons=17

Halogen

Explanation:

Given,

The electronic configuration:[tex]1s^2, 2s^2, 2p^6, 3 s^2, 3 p^5[/tex]

Atomic number= 2+2+6+2+5 = 17

Chlorine has the atomic number 17.

Symbol of chlorine= Cl

We know that,

The number of protons is equal to the atomic number.

Number of protons=17

And Chlorine belongs to the halogen group of the periodic table.

Answer:

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Explanation:

The volume : 8,526 quarts

Given

The density of whole milk = 1.04 g/ml

mass = 18.5 pounds

Required

The volume

Solution

Conversion of mass

1 pound = 453,592 g

18.5 pounds = 8391,45 g

Density formula:

[tex]\large{\boxed {\bold {\rho~=~ \frac {m} {V}}}}[/tex].

Input the value :

V = m : ρ

V = 8391,45 g : 1.04 g/ml

V = 8068.7 ml

1 ml = 0,00105669 quarts

8068.7 ml =8,526 quarts

Answer:

Valence electrons are the electrons in the outermost shell, or energy level, of an atom

Explanation:

Answer:

Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴

Answer:

Fully saturated or "a chance of rain"

Explanation:

When relative humidity reaches 100%, the air is fully saturated with vapor. That means that there is a possibility of rain.

Answer:

 -47749.69 joule energy release.

Explanation:

Given data:

Mass of water = 777.1 g

Initial temperature = 57.3°C

Final temperature = 42.6 °C

Energy change = ?

Solution:

Specific heat capacity of water is 4.18 J/g.°C

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 42.6 °C - 57.3°C

ΔT = -14.7°C

Q = 777.1 g × 4.18J/g.°C ×  -14.7°C

Q =  -47749.69 J

 -47749.69 joule energy release.

Answer: 0.500

Explanation:17.0 g H202 x (1 mol H202/34.0 g H202)=0.500 mol H202

Answer: 0.5 moles are present in 17.0 g of [tex]H_{2}O_{2}[/tex] .

Explanation:

Number of moles present in a substance is the given mass divided by molar mass of the substance.

As the given mass of [tex]H_{2}O_{2}[/tex] is 17.0 g and its molar mass is 34 g/mol.

Hence, number of moles present in given 17.0 g of [tex]H_{2}O_{2}[/tex] is as follows.

No. of moles = [tex]\frac{mass}{molar mass}[/tex]

                     = [tex]\frac{17.0 g}{34 g/mol}[/tex]

                     = 0.5 moles

Therefore, 0.5 moles are present in 17.0 g of [tex]H_{2}O_{2}[/tex] .

Answer:

Ammonium bromide can be prepared by the direct action of hydrogen bromide on ammonia. It can also be prepared by the reaction of ammonia with iron(II) bromide or iron(III) bromide, which may be obtained by passing aqueous bromine solution over iron filings.

Explanation:

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Answer:

i think thats c

Explanation:

Answer:

[tex]S_2F_{10}[/tex]

Explanation:

Hello!

In this case, since the empirical formula of a chemical compound is determined by assuming the by-mass percentages are masses, we can firstly compute the moles of sulfur and fluorine based on their atomic masses:

[tex]n_S=25.24gS*\frac{1molS}{32.01gS}=0.789molS\\\\n_F=74.76gF*\frac{1molF}{19.00gF}=3.93molF[/tex]

Next, we compute the subscript of each element in the formula by dividing each moles by the fewest moles:

[tex]S=\frac{0.789}{0.789}=1\\\\F=\frac{3.93}{0.789} =5[/tex]

Whose molar mass is 127.01 g/mol. Now, we can compute the ratio between the molecular and empirical formulas as follows:

[tex]ratio=\frac{254.14}{127.01} =2[/tex]

Thus, the molecular formula is:

[tex]S_2F_{10}[/tex]

Regards!

Answer:

a motor that requires no energy input once it is running

Answer:

c

Explanation:

a p e x :)

Answer:

Continential

Explanation:

foggy, overcast, and sunny are all examples of weather