23 Which device requires electrical energy to
produce a chemical change?
(3) voltaic cell
(1) electrolytic cell
(2) salt bridge
(4) voltmeter

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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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%.

Taking into account the reaction stoichiometry, 2 moles of CaO are required to react with 2 moles of Ca(OH)₂.

In first place, the balanced reaction is:

CaO + H₂O → Ca(OH)₂

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 following rule of three can be applied: If by stoichiometric reaction 1 mole of Ca(OH)₂ is produced by 1 mole of CaO, 2 moles of Ca(OH)₂ are produced by how many moles of CaO?

[tex]moles of CaO=\frac{2 moles of Ca(OH)_{2}x1 mol of CaO }{1 mole of Ca(OH)_{2}}[/tex]

moles of CaO= 2 moles

Finally, 2 moles of CaO are required to react with 2 moles of Ca(OH)₂.

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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

Molarity=Moles of solute/Volume of solution in L

So

Mads of Iodine

Answer:

3-methyl pentane

Explanation:

The longest chain of carbons is 5, so it will have the prefix pent-.

The first branch is on the 3rd carbon, and it is a 1 carbon branch. This means the branch will be called 3-methyl.

Now to find the suffix we need to count the carbons and the hydrogens. There are 6 carbons and 14 hydrogens, which follows the formula for an alkane ([tex]C{_n}H{_{n+2}}[/tex]). This gives it the suffix -ane.

Now we can name the compound:

3-methyl pentane

That is the answer

- Kan Academy Advance

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

The density of the liquid in the bottle will be 0.665 g/mL

Mathematically, density is given as:

Density = mass/volume

Mass of liquid = mass of bottle + liquid - mass of empty bottle

                       = 6.3 - 4.24 = 2.06 g

volume of liquid = 3.100 mL

Density of liquid = 2.06/3.100 = 0.665 g/mL

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Answer:

d the average kinetic energy of the particles

The strategy for balancing the equations is by looking at the number of atoms on each side of the equation and adding coefficients to the molecules.

A balanced equation is an equation for a chemical reaction where the number of atoms for each element in the reaction and the total charge is the same for the reactants and the products,

A strategy that will help balance equations more quickly is balancing by inspection. Here, you look at how many atoms you have on each side of the equation and add coefficients to the molecules to balance out the number of atoms.

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Answer:

2.77g of [tex]AlCl_{3}[/tex] can be produced.

Explanation:

Use stoichiometry.

Balanced equation: [tex]3Al + 3NH_{4} ClO_{4}[/tex] ⇒ [tex]Al_{2} O_{3} + AlCl_{3} +3NO + 6H_{2} O[/tex]

[tex]NH_{4} ClO_{4} : AlCl_{3}[/tex]

      3        :     1                        **[tex]n=\frac{m}{M}[/tex]

 0.0623**   :    [tex]x[/tex]                        [tex]n=\frac{7.32}{117.49}[/tex]   = 0.0623

      [tex]3x=0.0623\\x=0.020767[/tex]

[tex]n=\frac{m}{M}[/tex]    

[tex]m=nM[/tex]

m= (0.020767)(133.34)

m= 2.77g                                  

Answer: (2)

Explanation:

There are 16 oxygen atoms on the reactant side but only 10 on the products side.

Linking monomers together to form a polymer .This chemical reaction also forms water molecules.

This is a type of reaction which involves the linking of two or more monomers to form a polymer.

Dehydration reaction forms water molecules as part of the product thereby making it the most appropriate choice.

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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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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]

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:

O2 is limiting reactant

Explanation:

4 x Al = 107.924 gm

6 x O  = 95.994  gm

     you need ALMOST as many grams of O2 as Aluminum....

          you are short of O2  <======the limiting reactant

Answer:

See below ~

Explanation:

The respective pairs are :

× Ribose ⇒ The sugar of RNA

× Double helix ⇒ Structures of DNA

× Watson & Crick ⇒ Proposed the double helix model

× Base pair ⇒ Adenine - Thymine pair

× Cytosine ⇒ The nucleotide pair of Guanine

[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]

Answer:

What happens when a piece of hot metal is dropped in room temperature water. Over time the metal will cool and the water will heat up. Eventually the two objects will have the same temperature. They are then said to be in thermal equilibrium with one another.

Explanation:

i hope this helps you!!

Option D is the correct answer , 13.5gm of precipitate would result if 50 grams of NaCl at 10 degrees Celsius and its cooled to saturation.

the maximum quantity of a substance that will dissolve in a certain quantity of water at a specified temperature.

From the Solubility Graph of NaCl , we can see that the solubility of NaCl at 10 C is around 36.5gm/L.

If it is cooled down to saturation we will see the precipitate forming and that will be equal to the difference of solute present and the solubility.

As it is given that 50gm of solute is present

The precipitate will be 50- 36.5 gm, = 13.5 gm.

Therefore Option D is the correct answer , 13.5gm of precipitate would result if 50 grams of NaCl at 10 degrees Celsius and its cooled to saturation.

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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:

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:

On the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group. As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.

Answer:

See explanation.

Explanation:

Are you literally posting your entire you chemistry homework on this site, one question at a time? Anyways, the heat death refers to the second law of thermodynamics and entropy. Heat is constantly flowing from warmer to cooler objects and never the other way around. This heat flow increases entropy, which is constantly increasing. The universe will eventually disperse all of its heat energy away to continuously increase entropy and reach a limit as the temperature reaches 0 K at which point all molecular motion will cease and so will the life of the universe.

Answer:

hypothesis on the ultimate fate of the universe, which suggests the universe would evolve to a state of no thermodynamic free energy and would therefore be unable to sustain processes that increase entropy.

Explanation:

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:

Answer:

1 mol of N2

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

22.4 L of N2

=1.272 mole of N2

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