An element in Group 2 of the periodic table likely has which characteristics?

Hydrazine is a colourless fuming corrosive strongly reducing liquid base [tex]N_2H_4[/tex] used especially in fuels for rocket and jet engines. And [tex]2H_2[/tex](g) is used to prepare hydrazine. Hence, option B is correct.

[tex]N_2(g)+2H_2(g)[/tex] → [tex]N_2H_4(g)[/tex]

Hydrazine is a chemical compound with the formula [tex]N_2H_4[/tex]. It has an ammonia-like odour, but the properties are more similar to water.

Chemical equation of the formation of hydrazine:

[tex]N_2(g)+2H_2(g)[/tex] → [tex]N_2H_4(g)[/tex]

Hence, option B is correct.

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Answer:

D

Explanation:

If delta G at standard conditions is positive, then the reaction will always be nonspontaneous in the forward direction.

Answer:

N2020

Explanation:

I’m not fully sure but I’m pretty sure it’s wrong

In a redox chemical reaction, one species gets reduced and another gets oxidized. Manganese element is reduced in this reaction.

In a redox reaction, the increase or decrease in the oxidation number and electrons results in the reduction and oxidation of the chemical species. The oxidation and reduction occur simultaneously in a reaction.

The oxidation number of Mn in permanganate ion was +8 on the left side and decreased to +4 on the right side of the equation. Potassium permanganate is an oxidizing agent that has reduced the manganese ion of the permanganate ion.

Therefore, manganese is reduced.

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Explanation:

Exothermic reactions are those reactions in which heat is released.

Reactants→products+heat

For example, formation of ammonia from nitrogen and hydrogen is an exothermic reaction.

N2(g)+3H2(g)→2NH3(g)+92.2kJ

Endothermic reactions are those reactions in which heat is absorbed.

Reactants+heat→products

For example, dissociation of ammonia into nitrogen and hydrogen is an endothermic reaction.

2NH3 (g)+92.2kJ→

N2(g)+3H2(g)

Answer:

22.5 mg

Explanation:

36 hrs / 9 hr/half life = 4 half lives

(1/2)^4   * 360 = 22.5 mg

Molar concentration is the ratio of the moles and the volume. The volume of the solution that is needed is

Molarity or the molar concentration is the proportion of the moles of the solute to the volume of the solution in liters.

Given,

The molar concentration of the solution = 0.450 mol/L

Moles of sodium nitrite = 0.300 moles

Volume is calculated as:

[tex]\begin{aligned} \rm volume &= \rm \dfrac{moles}{molarity}\\\\&= \dfrac{0.300}{0.450}\\\\&= 0.666 \;\rm L\end{aligned}[/tex]

Therefore, 666 mL of volume is needed.

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Answer:

Explanation:

a.) Its compounds can only be chemically separated into the elements that make it up.

Water's compounds can only be chemically separated into the elements that make it up. The elements that make up water are two hyrdogen atoms and one oxygen. They only way to break down water is to return to the original three atoms.

I HOPE THIS HELPS & good luck <3 !!!!

The scientific question that is being asked by the archeologist is the age of the sample.

A scientific question is a question that can be answered empirically. That is, the question can be answered through an experiment.

Given the explanation in the question, the scientific question that is being asked by the archeologist is the age of the sample.

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a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance: The formation of rust on iron is a chemical change. Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

Answer:

Ideal?

Explanation:

This question is lacking context, but it's most likely looking for ideal. There is an idea of "ideal" gasses, which are gasses the behave according the ideal gas law PV=nRT. The concept is the gasses can get very close to behaving ideally, but there is never a gas the will perfectly obey the ideal gas law. There are many factors that affect this, but I won't get into thoes since that's not what the question asked.

The hydrogen chloride is a gas at room temperature due to the presence of weak intermolecular forces.

Hydrogen chloride (HCl) is a chemical compound in which polar covalent bond is present between hydrogen atom and chlorine atom.

This bond is not so strong enough to maintain the stability in the liquid phase, else they are weak intermolecular forces and easily gets break through small amount of energy and having low boiling point. That's why HCl is present in gaseous state at room temperature.

Hence due to weak intermolecular force, HCl is present in gaseous state.

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Answer:

it is regurgitated and an owl pellet

(a)

pH = 4.77

; (b)

[

H

3

O

+

]

=

1.00

×

10

-4

l

mol/dm

3

; (c)

[

A

-

]

=

0.16 mol⋅dm

-3

Explanation:

(a) pH of aspirin solution

Let's write the chemical equation as

m

m

m

m

m

m

m

m

l

HA

m

+

m

H

2

O

⇌

H

3

O

+

m

+

m

l

A

-

I/mol⋅dm

-3

:

m

m

0.05

m

m

m

m

m

m

m

m

l

0

m

m

m

m

m

l

l

0

C/mol⋅dm

-3

:

m

m

l

-

x

m

m

m

m

m

m

m

m

+

x

m

l

m

m

m

l

+

x

E/mol⋅dm

-3

:

m

0.05 -

l

x

m

m

m

m

m

m

m

l

x

m

m

x

m

m

m

x

K

a

=

[

H

3

O

+

]

[

A

-

]

[

HA

]

=

x

2

0.05 -

l

x

=

3.27

×

10

-4

Check for negligibility

0.05

3.27

×

10

-4

=

153

<

400

∴

x

is not less than 5 % of the initial concentration of

[

HA

]

.

We cannot ignore it in comparison with 0.05, so we must solve a quadratic.

Then

x

2

0.05

−

x

=

3.27

×

10

-4

x

2

=

3.27

×

10

-4

(

0.05

−

x

)

=

1.635

×

10

-5

−

3.27

×

10

-4

x

x

2

+

3.27

×

10

-4

x

−

1.635

×

10

-5

=

0

x

=

1.68

×

10

-5

[

H

3

O

+

]

=

x

l

mol/L

=

1.68

×

10

-5

l

mol/L

pH

=

-log

[

H

3

O

+

]

=

-log

(

1.68

×

10

-5

)

=

4.77

(b)

[

H

3

O

+

]

at pH 4

[

H

3

O

+

]

=

10

-pH

l

mol/L

=

1.00

×

10

-4

l

mol/L

(c) Concentration of

A

-

in the buffer

We can now use the Henderson-Hasselbalch equation to calculate the

[

A

-

]

.

pH

=

p

K

a

+

log

(

[

A

-

]

[

HA

]

)

4.00

=

−

log

(

3.27

×

10

-4

)

+

log

(

[

A

-

]

0.05

)

=

3.49

+

log

(

[

A

-

]

0.05

)

log

(

[

A

-

]

0.05

)

=

4.00 - 3.49

=

0.51

[

A

-

]

0.05

=

10

0.51

=

3.24

[

A

-

]

=

0.05

×

3.24

=

0.16

The concentration of

A

-

in the buffer is 0.16 mol/L.

hope this helps :)

The equilibrium constant of this reaction is 1.80×10-5

Given data,

pH of solution = 2.873

Number of moles of acetic acid (m) = 0.05 moles

Volume of water (V) =  500 mL = 0.5L

So, concentration (C) = m/V in lit = 0.05/0.5 = 0.1 M

Equilibrium constant ( K ) = [tex][CH_{3} COO-][/tex]×[tex][H+_{} ][/tex]/[tex][CH_{3} COOH][/tex]

Since, acetic acid is weak acid,

So, Equilibrium constant ( K ) = [tex][H+]^{2}[/tex]/[tex][CH_{3} COOH][/tex]   ....(i)

As the pH = 2.873, the [tex][H+_{} ][/tex] is antilog of -2.873 or 1.34×10-3 M.

Putting the value of concentration of [tex]H+_{}[/tex] and [tex]acetic_{} acid[/tex] in equation (i).

Equilibrium constant ( K ) = 1.80×10-5

The acid which is partially dissociates into ions on dissolving in aqueous solution is called weak acid.

Example: [tex]acetic_{} acid[/tex].

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Answer:

14.9 g Sb

Explanation:

The mass of Sb produced can be calculated using the conversion:

Molar Mass (g/mol) = mass (g) / moles

Antimony (Sb) has the molar mass 121.76 g/mol. This value is found on the periodic table. You have been given the moles produced. Therefore, you can find the mass of Sb by plugging these values into the formula and simplifying.

Molar Mass = mass / moles

121.76 g/mol = mass / 0.122 moles

14.9 = mass

2.2311 moles of gas are there in a 50. 0 l container at 22. 0 °c and 825 torrs.

An Ideal gas is a hypothetical gas whose molecules occupy negligible space and have no interactions, and which consequently obeys the gas laws exactly.

Assuming the gas is ideal, we can solve this problem by using the following equation:

PV = nRT

Where:

P = 825 torr ⇒ 825 / 760 = 1.08 atm

V = 50 L

n = ?

R = 0.082 atm·L·mol⁻¹·K⁻¹

T = 22 °C ⇒ 22 + 273.16 = 295.16 K

We input the data:

1.08 atm x 50 L = n x 0.082 atm·L·mol⁻¹·K⁻¹ x 295.16 K

And solve for n:

24.20312

n = 2.2311 mol

Hence, 2.2311 moles of gas are there in a 50. 0 L container at 22. 0 °c and 825 torrs.

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[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

Since we already know that HCl is an acid and acids have low pH values, it must have pH less than 7, so we can conclude that it has A low pH and A high pOH value.

So, the solution containing HCl must be the same.

That is :

A low pH and a high pOH

Answer:

B

Explanation:

Answer: increase

Explanation: as pressure is increased, equlilibrium shifts towards the side with less moles of gas.  

The solubility product constant, Ksp, of the aluminum hydroxide, Al(OH)₃ at the temperature is 1.91×10¯³⁹

The solubility of product (Ksp) is defined as the concentration of products raised to their coefficient coefficients. This is illustrated below:

mA <=> nC + eD

Ksp = [C]^n × [D]^e

With the above information in mind, we can obtain the solubility of the product. This is illustrated below:

Al(OH)₃(aq) → Al³⁺(aq) + 3OH¯(aq)

From the balanced equation above,

1 mole of Al(OH)₃ contains 1 mole of Al³⁺ and 3 moles of OH¯

From the balanced equation above,

1 mole of Al(OH)₃ contains 1 mole of Al³⁺ and 3 moles of OH¯

Therefore,

2.9×10¯⁹ M Al(OH)₃ will also contain

Concentration of Al³⁺ = 2.9×10¯⁹ M

Concentration of OH¯ = 8.7×10¯⁹ M

Solubility product (Ksp) =?

Al(OH)₃(aq) → Al³⁺(aq) + 3OH¯(aq)

Ksp = [Al³⁺] × [OH¯]³

Ksp = 2.9×10¯⁹ × (8.7×10¯⁹)³

Ksp = 1.91×10¯³⁹

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Answer:

3 atoms

Explanation:

A water molecule consists of three atoms an oxygen atom and two hydrogen atoms which are bond together like little magnets

Answer:

.00000005 C       or     50 x 10^-9 C

Explanation:

Like charges   REPEL

k = 8.99 x 10^9   kg m^3 / s^2 C^2    ( they should have given units of this)

F = k q1q2/r^2      q1 = q2   so

F = k q^2 / r^2

9 x 10^-3    = 8.99 x 10^9  * q^2 /.05^2            (.05 m = 5cm)

q = .00000005 C

Answer:

The reaction is exothermic.

The the percent yield of the given reactions is the ratio of the actual yield and the theoretical yield expressed as a percentage.

The percent yield of a reaction is the ratio the actual yield and the theoretical yield of a reaction expressed as a percentage.

The actual yield is obtained from the experiment while the theoretical yield is obtained from the equation of the reaction.

The percent yield of a reaction gives an indication of how efficient the reaction conditions were.

The equation of the reaction in the given question is not stated.

Therefore, the percent yield of the given reactions is the ratio of the actual yield and the theoretical yield expressed as a percentage.

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The equilibrium constant, ka, for the monoprotic acid is 7.08 × 10⁻¹⁶.

Acid dissociation constant (Ka) for monoprotic acid will be calculated according to the given equation:

Ka = [H₃O⁺][A⁻] / [HA]

Relation between H₃O⁺ and pH will be represented as:

[H₃O⁺] = [tex]10^{-pH}[/tex]

pH = 6.44 (given)

[H₃O⁺] = [tex]10^{-6.44}[/tex] = 3.63×10⁻⁷

Given chemical reaction with ICE table is:

                      HA(aq)  +  H₂O(l)  ⇄  H₃O⁺(aq)  +  A⁻

Initial:            0.0186                               0            0

Change:        -3.63×10⁻⁷                   3.63×10⁻⁷   3.63×10⁻⁷

Equilibrium: 0.0186-3.63×10⁻⁷         3.63×10⁻⁷   3.63×10⁻⁷

Now Ka for this will be:

Ka = (3.63×10⁻⁷)² / (0.0186-3.63×10⁻⁷)

Value of 3.63×10⁻⁷ is negligible as compared to the 0.0186 value and equation becomes,

Ka = (3.63×10⁻⁷)² / 0.0186 = 13.18 × 10⁻¹⁴ / 0.0186

Ka = 7.08 × 10⁻¹⁶

Hence value of equilibrium constant is 7.08 × 10⁻¹⁶.

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Answer:

beta, gamma. gamma. alpha, alpha

Explanation:

Answer:

1. Beta

2. Gamma

3. Gamma

4. Alpha

5. Alpha

Explanation:

Answer:174 m/s

Explanation:

I took the test and got 100%

Answer:

physical

Explanation:

the snow caused the erosion.

Answer:

physical

Explanation:

Answer:

it would sink to the bottom of the ocean and break in half

Explanation:

Explanation:

so if the ship was on displaced water then the ship would sink to the bottom of the ocean

As lowest significant is 2.65

It should be rounded till second decimal