police said that there were 5000 grams of H2 in the room. Convert grams of hydrogen into grams of water and see if the was enough.

As lowest significant is 2.65

It should be rounded till second decimal

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

Answer:

A change in state of matter

Explanation:

» Concepts

A chemical change is a change in a substance's chemical composition, causing it to go from one thing to a completely new thing. You can't go back to the original thing with a chemical change. A sound, new substance,  odor production, gas release, and light production are all signs of a chemical change

With a physical change, you can easily go back to any state of matter. For example, if you melt an ice cube into water, just freeze it up again.

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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[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:

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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Answer:

physical

Explanation:

the snow caused the erosion.

Answer:

physical

Explanation:

If the oxygen in the air reacts with iron metal in a nail to produce iron (III) oxide, the limiting reactant would be iron.

They are reactants that are limited in supply in reactions and thus, determine the total amount of products that would be formed.

Oxygen is abundant in the air, unlike iron in nails.

Thus, there is an unlimited amount of oxygen that can react with iron. However, the amount of iron in nails, which is limited, will determine the total amount of rust that would be formed.

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Answer:174 m/s

Explanation:

I took the test and got 100%

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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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:

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

Answer:

22.5 mg

Explanation:

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

(1/2)^4   * 360 = 22.5 mg

(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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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:

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.

Answer:

N2020

Explanation:

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

Taking into account the reaction stoichiometry, 421.48 grams of NaC₂H₃O₂ are formed from 5.14 mole of sodium bicarbonate.

In first place, the balanced reaction is:

HC₂H₃O₂ + NaHCO₃ → NaC₂H₃O₂ + CO₂ + H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 1 mole of NaHCO₃ form 82 grams of NaC₂H₃O₂, 5.14 moles of  NaHCO₃ form how much mass of NaC₂H₃O₂?

[tex]mass of NaC_{2} H_{3} O_{2} =\frac{5.14 moles of NaHCO_{3}x82 grams of NaC_{2} H_{3} O_{2}}{1 mole of NaHCO_{3}}[/tex]

mass of NaC₂H₃O₂= 421.48 grams

Then, 421.48 grams of NaC₂H₃O₂ are formed from 5.14 mole of sodium bicarbonate.

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Answer:

photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. The effect is often defined as the ejection of electrons from a metal plate when light falls on it.

Answer: The Photoelectric Effect occurs when a light withdraws an electron from a metal. The light must have at minimum the necessary energy to expel a particle from the surface of the metal. As a lack of a better description, consider sodium metal.

Explanation:

Answer:

it is regurgitated and an owl pellet

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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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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Answer:

Shiny solid. Conducts heat and electricity. Easily bends

Explanation:

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 !!!!

When you put one hand in ice water and the other in warm water, the hand in warm water will feel the room temp water cooler, and the hand in cold water feel room temperature water warmer.

The ability of a body to adjust to temperature is called thermal adaptation. Mammals are the animals who can adjust the temperature of their body.

The reptiles are not able to adjust their body temperature, because they are poikilothermic. They have to take the help of outer environment to adjust their body temperature.

Thus, when you put one hand in ice water and the other in warm water, the hand in warm water will feel the room temp water cooler, and the hand in cold water feel room temperature water warmer.

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Newton's law of motion states the relationship between the force acting on the body in motion. The relation between force, mass, and acceleration is given by Newton's second law.

Newton's second law states the relationship between mass, force, and acceleration. It relates the force with the change of the motion of an object with a mass.

Newton's second law is given as,

[tex]\rm F = ma[/tex]

Where F is force, m is the mass of the object and a is the acceleration.

Newton's first law is about inertia, the third law is about the law of action and reaction, and the fourth law is about the law of gravitation.

Therefore, option B. Newton's second law states the relationship between force, mass, and acceleration.

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The definition of astronomic bodies are indicated below with the sentences defining them.

Astronomic bodies are celestial objects that occur naturally in space.

Here are their definitions below:


a. Supernova exhibits strong gravitational pull such that no light can escape

b. A nebula a large cloud of gas or dust in space.

c. A white dwarf is what a medium-mass star becomes at the end of it's life.

d. Protostar is the earliest stage of a star's life.

e. Black dwarf is a star left at the core of a planetary nebula.

f. Neutron stars are the remains of a high mass star.

g. A supernova is what occurs when a red supergiant star explodes.

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Answer:

beta, gamma. gamma. alpha, alpha

Explanation:

Answer:

1. Beta

2. Gamma

3. Gamma

4. Alpha

5. Alpha

Explanation: