A sample of 41.9 g of aluminum is reacted with
67.2 g of chlorine gas to produce aluminum
trichloride. Using the balanced equation below,
predict which is the limiting reactant and the
maximum amount in moles of aluminum trichloride
that can be produced.
2A1 + 3Cl2 + 2AlCl3
A. aluminum, 1.55 moles
B. chlorine gas, 0.632 moles
C. aluminum, 0.865 moles
D. chlorine gas, 0.954 moles

Answer a) 12 neutrons
b) 12 electrons
a) 12 protons

Explanation:

The atomic number is the number of protons in an atom and is also the number of electrons
therefore, the number of protons and electrons = 12

the mass number of an element is = # of protons + # of neutrons
if we rearrange it to find # of neutrons,
# of neutrons = mass number - # of protons
so, 24 - 12 = 12 neutrons

Answer:

Polarity is caused by the difference in electronegativity (EN) of a compound. For example, water, H2O, is polar because oxygen's EN is much higher than hydrogens. Therefore, the electrons spend more time around the oxygen and less time around the hydrogen causing a slightly positive pole at the hydrogens and a slightly negative at the oxygen. Most polar molecules are not symmetrical (like water). Non-polar molecules like CH4 (methane) do not have poles.

Hope that helps

Answer:

0.1876g

Explanation:

Since iron is in excess, therefore Magnesium is the limiting reactant.

Moles of Mg = mass/molar mass

0.120/24 = 0.005 moles

Compare the coefficient ratio of Mg and iron.

Ratio is 3 : 2

To find moles of iron we take 2/3 x 0.005

Moles of iron is 0.00335 moles

Mass = moles x molar mass

= 0.00335 x 56

= 0.1876g

Taking into account the reaction stoichiometry, 0.186 grams of Fe are produced when 0.120 g of magnesium reacts with excess iron chloride solution.

In first place, the balanced reaction is:

3 Mg+ 2 FeCl₃  → 2 Fe+ 3 MgCl₂

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 72 grams of Mg form 112 grams of Fe, 0.120 grams of Mg form how much mass of Fe?

[tex]mass of Fe=\frac{0.120 grams of Mgx112 grams of Fe}{72 grams of Mg}[/tex]

mass of Fe= 0.186 grams

Then, 0.186 grams of Fe are produced when 0.120 g of magnesium reacts with excess iron chloride solution.

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Answer:

Option B is correct.

Explanation:

Distance refers to the distance traveled by a body.

Hope it will help you.

Answer:

as temperature increases it speeds up chemical reactions and that accelerates the spoiling process of food. Keeping food in a cold place (a fridge) slows down those processes.

Answer:

28.12 kg

Explanation:

Here we are given that the density of copper is 8.92 g/ cm³ .

[tex]\sf \longrightarrow \rho_{(copper)}= 8.92 g/cm^3\\ [/tex]

And we are interested in finding out the mass of the given block . The dimensions of the block is 0.052m × 311mm × 19.5 cm .

[tex]\sf \longrightarrow Volume_{cuboid}= length * breadth * height \\ [/tex]

[tex]\sf \longrightarrow Volume = (0.052)(100) * (311\div 10) *(19.5) cm^3 \\ [/tex]

[tex]\sf \longrightarrow Volume = 5.2 * 31.1 * 19.5 cm^3 \\ [/tex]

[tex]\sf \longrightarrow Volume = 3153.54 cm^3\\ [/tex]

Now we may use Unitary Method to find out the mass of the block as ,

Mass of 1cm³ of copper is 8.92 g .

Mass of 3153.54 cm³ of copper will be 8.92*3153.54 g = 28129.57 g

[tex]\sf \longrightarrow \underline{\boxed{\bf Mass_{Cu}= 28.12 \ kg }} \\ [/tex]

Answer:

The answer is chemical weathering due to water reacting with calcite

Explanation:

The causes of chemical weathering include the action of water, oxyen, carbon dioxide, living organisms, and acid rain.

This is a type of bond present in electrovalent compounds.

This is a type of bond that exist in electrovalent or ionic compounds. It is formed as a result of combination between a positive cation and a negative anion. This results in the transfer of electron from the cation to the anion. This type of bond in which there's a complete transfer of electrons between both parties occurs easily as a result of the electronegative difference between the combining atoms. Compounds that show this type of bonding are combination between group 1 or 2 elements with group 16 or 17 elements.

Compound formed through this bond are strong, mostly dissolves in polar solvents due to their polar charges and also conducts electricity.

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1) list givens and convert if necessary

C₁ = 3.50 mol/L

V₁ = 0.550 L

C₂ = ?

V₂ = 0.275 L

2) rearrange formula

[tex]C_{1}V_{1}=C_{2}V_{2}\\\\C_{2}=\frac{C_{1}V_{1}}{V_{2}}[/tex]

3) solve

[tex]C_{2}=\frac{(3.50\ mol/L)(0.550\ L)}{(0.275\ L)}[/tex]

C₂ = 7.00 mol/L

Based on the observations, the change is physical.

This is because the matter is still the same composition after the change, while a chemical change would change the composition.

Based on the observations, both physical and chemical changes have occurred during the experiment.

Observation 1: Water droplets form on the inside of the glass lid. This is a physical change.

Observation 2: Bubbles rise as the water starts boiling. This is a chemical change.

A physical change is a transformation in a substance's state, shape, or form that does not alter its chemical composition or create new substances. During a physical change, the original substance remains the same, and no chemical bonds are broken or formed.

A chemical change, also known as a chemical reaction, involves the conversion of one or more substances into new substances with different chemical compositions. Evidence of a chemical change includes the production of gas, formation of a precipitate, release or absorption of heat or light, and changes in color and odor.

In observation 1, the water vapor in the air comes into contact with the cooler glass surface of the lid and condenses back into liquid water. Condensation is a physical change where a gas changes into a liquid.

Observation 2- Boiling is the process of converting liquid water into water vapor (gas) by absorbing heat energy. The heat causes water molecules to gain energy and transform into gas, forming bubbles that rise to the surface. This change involves the breaking of intermolecular forces between water molecules and is a chemical change.

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#SPJ3

Answer:

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.

Explanation:

Answer: Cytosine, Thymine, Cytosine, Guanine (option A)

Explanation:

In DNA strands, you must use base-pairing rules to complete strands.

The base-pairing rules are:

Adenine (A) bonds with Thymine (T)

Guanine (G) bonds with Cytosine (C)

By using these rules, you can pair the sequence GAGC with CTCG

The sequence CTCG is also represented as the bases Cytosine, Thymine, Cytosine, and Guanine, making A the correct answer.

I hope this helps!

Answer:

coastal area with very high tides deep ocean water miles from a river's mouth

Explanation:

Marshes are a type of wetland ecosystem where water covers the ground for long periods of time. Marshes are dominated by herbaceous plants, such as grasses, reeds, and sedges(National Geographic Society).

hope dis help

We have that the  minimum mass of ice , required to bring the final temperature to 15.0 ∘C is mathematical given as

From the question we are told

Generally the equation for the Heat released   is mathematically given as

Q=cDT

Q=3.4*8.1*10^3

Q=27540J

Therefore

Heat absorded

H=m*4*2.108+m/18*6.02*10^3+m*15*4.18

H=405.58mJ

THerefore

m=67.9g

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Answer:

41. False

42. True

43. False

44. False

45. True

46 - 48. Unsure (I don't take Biology, sorry.)

Explanation:

41.

FeS and HCl are the reactants of the chemical equation. Hence, false.

42.

It is common knowledge that HCl and H₂SO₄ are acids. Hence, true.

43.

Vinegar contains acetic acid CH₃COOH, which isn't a base. Hence, false.

44.

Fluorescence is actually the emittance of light by any substance due to radiation. Hence, false.

45.

Yes, the image produced by a plane mirror is laterally inverted. Hence, true.

Answer:

b) 3.000 mol S

Explanation:

using Avogadro's constant

1 mol = 6.02 × 10^23 atoms

we need to find the number of moles for 1.806 × 10^24

x = 1.806 × 10^24

putting it together we now have:

1 mol = 6.02 × 10^23 atoms

x = 1.806 × 10^24

cross multiply

6.02 × 10^23 x = 1.806 × 10^24

divide both sides by 6.02 × 10^23

x = (1.806 × 10^24) ÷ (6.02 × 10^23) = 3 mol

Answer:

alll of them are possible, besides the last one

Explanation:

All of them are correct compounds besides the last one. The last one isn’t a correct compound because the second element does not exist

#NaO_2

Correct compound=Na_2O

#MgCl_2

#CaF

#NaBr

#KHe

Helium is a noble gas so can't form compounds

Answer:

"At the top of the first and tallest hill, your potential energy is at its highest it will ever be on this ride. As you begin to descend, your potential energy decreases until it's all gone at the bottom of the hill." The shorter the hill the roller coaster climbs, the greater its kinetic energy.

Answer:

             Point - C

Explanation:

Ethylamine has a molar mass = 45.08 g/mol

While, HBr has molar mass = 80.91 g/mol

This means ethylamine will travel more distance than HBr in given time.

So, the white solid (Ethylammonium bromide) will form at point C.

Why Point C?

Point C is the only point which is farthest from ethylamine and closest to HBr. This point depicts that ethylamine has travelled more distance than HBr.

Answer:

The chemical changes are as follows:

Explanation:

-TheUnknownScientist 72

Explanation:

a, b, d, e and g

hope it's helpful

Option C is the right answer

The medium through which the velocity of a sound wave is greatest is: C. steel.

A sound wave can be defined as a form of mechanical wave that requires a medium for its propagation and it creates a disturbance in the medium. Thus, a sound wave needs a medium to travel and it creates a disturbance when it travels through any medium.

Some examples of the parameters of a sound wave include the following:

Generally, the velocity of a sound wave is greatest in a solid medium such as steel than in liquid or gaseous medium.

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Answer:

A small restaurant chain, founded and operated by a single family, is owned by shareholders whi purchase their shares on the stock exchange.

Explanation:

This is because publicaly help cop is usually ownership is zdetermined via shares of stovk

HOPE THIS HELPS

Answer: Color change, fizing, bubbling, whether it’s hot or cold.

Explanation:

Answer:

c

Explanation:

Answer:

It takes 0.27 second to travel the distance of  100 yard

Explanation:

We can use the formula ( t = d / s )t = d / s  = 91 m / 333 m/s  = 0.27 s

Molar mass of LiBr

[tex]\\ \sf\hookrightarrow No\:of\;moles=\dfrac{Given\:mass}{Molar\:mass}[/tex]

[tex]\\ \sf\hookrightarrow No\:of\:moles=\dfrac{66.1}{87}[/tex]

[tex]\\ \sf\hookrightarrow No\:of\:moles=0.75mol[/tex]

[tex]\\ \tt\bull\rightarrowtail 35.7823[/tex]

[tex]\\ \tt\bull\rightarrowtail 35.782[/tex]

[tex]\\ \tt\bull\rightarrowtail 35.78[/tex]

[tex]\\ \tt\bull\rightarrowtail 35.8[/tex]

Done

Answer:

11318 feet and 10.771 inches

Explanation:

there is 3280.84 in one Km

just do 3280.84x3.45

Answer: RAWRR

Explanation:RAWRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR

Answer:

Aluminium

Potassium

Answer: Hydrogen

Sodium Magnesium Aluminium

Potassium Calcium Gallium

Rubidium Strontium Indium

Caesium Barium Thallium

Explanation: