A Helium gas in a tube with a volume of 9.583 L under pressure of 4.972 atm at 31.8 c
How many moles of Helium gas is in the tube

1.9 mol
0.019 mol
18.24 mol
0.525 mol

The product of the reaction is given by the changes in the chemical and physical properties of the reactants. The product produced is aluminum sulfide precipitate.

A precipitate is an insoluble complex formed when the solute and the solvent reacts to produce and solid complex material that does not get completely dissolved in the solution.

When ammonium sulfide is added to a solution containing aluminum ions then precipitate of aluminum sulfide is formed as:

3(NH₄)₂S + 2Al³⁺ → Al₂S₃ + 3NH₄⁺

Therefore, aluminum sulfide is the precipitate that gets formed.

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Answer:

2-methylbutane

Explanation:

First, you want to identify the largest number of sequential carbons. In this case, the parent chain is made up of 4 carbons. This makes the base name, butane.

Next, you want to identify any branches. There is a branch made up of 1 carbon, and these are referred to as a methyl group. The lowest possible carbon on the parent chain this branch is attached to is the second carbon.

When you put these factors together, you are left with the name: 2-methylbutane.

Answer:

The chemical compounds of living things are known as organic compound because of their association with organisms and because they are carbon-containing compounds, which are the compounds associated with life processes, are the subject matter of organic chemistry

Answer:

When barium chloride (BaCl 2) is dissolved in water, the water conducts electricity. In what form will the dissolved BaCl 2 be found? a. as Ba 2+ and Cl - ions b. as Ba atoms and Cl 2 molecules

Explanation:

0.050 moles of hydrogen gas are liberated when a given quantity of charge liberates 0.050 moles of lead.

The amount in moles of hydrogen produced when the same quantity of electricity is passed through different electrolytes is inversely proportional to the charge on the ions.

The charge on the Lead ion is +2.

The charge on the hydrogen ion is +1.

2 atoms of hydrogen gives one molecule of hydrogen gas.

Hence, equal charge liberates equal amounts in moles of lead and hydrogen gas.

Therefore, 0.050 moles of hydrogen gas are liberated when a given quantity of charge liberates 0.050 moles of lead.

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Answer:

1 mol of N2

Mole of N2= 28.5 L × -------------------

22.4 L of N2

=1.272 mole of N2

[tex]\\ \rm\Rrightarrow \lambda=\dfrac{c}{\nu}[/tex]

[tex]\\ \rm\Rrightarrow \lambda=\dfrac{3\times 10^8}{3.44\times 10^9}[/tex]

[tex]\\ \rm\Rrightarrow \lambda=0.872\times 10^{-6}[/tex]

[tex]\\ \rm\Rrightarrow \lambda=0.9\mu m[/tex]

When the same amount of heat is added to cold sand and cold water, the temperature change of sand will be higher because of its lower specific heat capacity.

Specific heat capacity is the quantity of heat required to raise a unit mass of a substance by 1 kelvin.

Water, c = 4,200 J/kg⁰C

Sand, c = 830 J/kg⁰C

Q = mcΔθ

where;

Δθ = Q/mc

Thus, for an equal mass of water and sand, when the same amount of heat is added to cold sand and cold water, the temperature change of sand will be higher because of its lower specific heat capacity.

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Answer:t

Explanation:

From the equation, we see that for every 4 moles of pyrite consumed, 11 moles of oxygen are consumed.

So, the answer is (10.5/4)(11) = 28.875 mol

An Arrhenius acid is a substance that dissociates in water to form hydrogen ions or protons.

An Arrhenius acid increases the number of[tex]H^+[/tex] ions in the water.

According to the Arrhenius theory, a substance which has hydrogen atom and can easily give hydrogen ion or proton in its aqueous solution is called as Arrhenius acid.

For example, when hydrochloric acid is dissolved in water, it forms chloride ion ([tex]Cl^-[/tex]) and hydronium ion ([tex]H_3O^+[/tex]).

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Answer:

What is the difference between pools and fluxes?

Image result for Is industry pool or flux

Fluxes describe the movement of energy and matter between different pools. When you pour a glass of juice for yourself, the juice bottle and the glass are both “pools” for the apple juice. The act of pouring it from the bottle to the glass is the flux

Explanation:

Pathology is the main branch of forensics in order to solve a criminal justice case, although other branches may also be important.

Forensic sciences refer to the scientific fields aimed at solving justice cases such as DNA sample forensics.

Other fields in forensics science include:

In conclusion, pathology is the main branch of forensics in order to solve a criminal justice case, although other branches may also be important.

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Oil drop on waxed paper is less dispersed since it has non-polar interactions therefore occurs circular in shape.

Polar interactions are the strong and long-range interactions between molecules that are based on electrostatic attraction.

In this case, the shape of this drop with the shape of the water drop on the waxed paper is that the oil drop on waxed paper is less dispersed since it has non-polar interactions

Also, oil and water do not have any interactions so the oil drop is more dispersed and occurs to be oval in shape.

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An engineer's solution to a problem would involve designing shatter-resistant windows for a car.

An engineer is a person who applies the knowledge of science to design tools and equipment which are used to solve the problems facing man.

An engineer specializes in the scientific field of engineering.

Some tools or devices produced by engineers are machines and vehicles such as cars and aeroplanes.

Therefore, an engineer's solution to a problem would involve designing shatter-resistant windows for a car.

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The ionization constant from the reaction as shown in the calculation is 5.8.

The term ionization constant refers to the extent to which the acid is ionized in solution. It is calculated from;

Ka = [H3O^+] [Cl]/[HCl]

Thus when we substitute the values;

Ka = 13.3 * 7.4/ 16.9

Ka = 5.8

The ionization constant from the reaction as shown in the calculation is 5.8.

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Answer:

70%

Explanation:

To find the percent yield, you need to (1) convert grams HCl to moles (via molar mass from periodic table), then (2) convert moles HCl to moles H₂ (via mole-to-mole ratio from equation), then (3) calculate the percent yield H₂ (via percent yield equation).

Zn (s) + 2 HCl (aq) --> ZnCl₂ (aq) + 1 H₂ (g)

Molar Mass (HCl): 1.008 g/mole + 35.45 g/mole
Molar Mass (HCl) = 36.458 g/mole

125 g HCl         1 mole HCl         1 mole H₂
---------------  x  ------------------  x  ------------------  = 1.7 moles H₂
                         36.458 g           2 moles HCl

(actual yield / theoretical yield) x 100% = percent yield

theoretical/calculated yield = 1.7 moles H₂
actual yield = 1.2 moles H₂

(1.2 moles H₂ / 1.7 moles H₂) x 100% = 71%

Therefore, the best percent yield of hydrogen produced is 70%.

Answer:

Unbalanced

Explanation:

[tex]\text{Fe}(\text{NO}_3)}_3+ \text{NaOH} \rightarrow \text{Fe(OH)}_3 + \text{NaNO}_3\\\\\text{Balanced reaction:}\\\\\text{Fe}(\text{NO}_3)}_3+ 3\text{NaOH} \rightarrow \text{Fe(OH)}_3 + 3\text{NaNO}_3[/tex]

Energy enters into the ecosystem via sunlight and leaves as heat from metabolism.

The term energy refers to the ability to do work. Energy enters the ecosystem from the sun and is transformed into chemical energy in food which is now passed along the food chain.

Animals eat plants and part of this energy is used for metabolic activities which releases some of this energy as heat energy.

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Answer:

Supersaturated solution

Explanation:

Weren't there any options?

Anyways, the best I can think of right now is a supersaturated solution.

Answer:

Yes

Explanation:

Neither Calcium nor hydrogen nor oxygen are alkali metals

Here

Ca(OH)_2 is the compound

Vant Hoff factor is 3

As it's greater than 1 it's a very strong base .

The pOH of this comes around 1.5 to 1.3

So very heavy ionic dissociation

Strong Alkali

Calcium hydroxide [tex] \sf \: Ca(OH)_2[/tex] is a really strong alkali or base since it has the power to accept proton when added to a solution.. Its pH is 9 and we know that when the pH is more than 7 it is a base..

One more reason why calcium hydroxide is a strong alkali is that it dissociates completely when added to any solution...

Answer:

35.4 % left

Explanation:

6.75  / 4.5   = 1.5  half lives

1/2 ^(1.5) = .354      or   35 .4 %

Answer:

2.68 Liters

Explanation:

ideal gas law

PV=NRT

to get the volume

rearrange the formula

V=nRT/P

R molar gas constant is in units joules per mole kelvin :

8.314 J/(mol K) (joules per mole kelvin)

T temperature part of this is in kelvin so you have to convert the Celsius temperature to kelvin

1 Celsius is 274.15 kelvin so

83.4 Celsius is 356.55 kelvin

P pressure is in Pascal or Pa units

so you have to convert atm into Pa

1 atm is 201636.8 Pa or Pascals so

1.99 atm is 201636.8 Pa

V volume will be in cubic meters or m^3

m^3 will need to changed to liters

1 cubic meter or m^3 is 1000 liters

n amount of substance is in moles

again the rearranged formula is

V=nRT/P

(0.182*8.314*356.55)/201636.8 =

0.00267566693 cubic meters or m^3

1 cubic meter or m^3 is 1000 liters so

0.00267566693 cubic meters or m^3 times 1000 =

2.67566693 liters

Gamma decay is a radioactive decay in which there is no measurable change in mass and the element remains the same.

In gamma decay, the number of protons and neutrons in the nucleus does not change, so the product of decay remain the same element..

Note that mass number is equal to the sum of the protons and neutrons and so if there is no change, the mass of the element remains the same.

Thus, gamma decay is a radioactive decay in which there is no measurable change in mass and the element remains the same.

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Answer:

No, assuming that the salt/sugar is already dissolved

Explanation:

As long as the particle size is too big, it won't filter through. Therefore, if it is dissolved, it will pass through the filter.

If you were to throw rocks in there or something, and they are non-dissolvable, then yes.

Let's see

Answer:

v = 4.62 L

Explanation:

Necessary Conversion:

1000 g = 1 kg

Density of Oil in kg/mL:

0.78g/ml * (1 kg/1000 mL) = 0.00078 kg/mL

Density Equation (Heart with an arrow through it):

d = m/v

Rewrite to Find Volume (Multiply Both Sides by v/d):

v = m/d

Substitue m and d to Find v:

v = (3.6 kg)/(0.00078 kg/mL)

v = 4615.38 mL

Convert to More Suitable Units (Liters) by Dividing by 1000:

v = 4.62 L

:D

Answer:

2.11×10^24

Explanation:

You times the Avogadro number by 3.5

6.023 times 10^23.

then times it by 3.5.

I got 2.11 times 10 ^24.

I hope this helps. Have a lovely day.

Answer:

D evaportaion. it shows the sun evaporating the lake.