Which of the following is an engineer's solution to a problem?
OA. Searching for the existence of planets around a distant star
OB. Designing shatter-resistant windows for a car
C. Observing the reaction when two substances are combined
D. Recording species of plants that inhabit an island

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:

D evaportaion. it shows the sun evaporating the lake.

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:

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

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:

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.

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

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]

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:

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:

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:

1 mol of N2

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

22.4 L of N2

=1.272 mole of N2

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:

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:

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                                  

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:

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

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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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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Molarity=Moles of solute/Volume of solution in L

So

Mads of Iodine

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:

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:

[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]

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:

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.

Let's see

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