Which of the following units is best when measuring the length of an object?

Answer:

2Al(ClO₃)₃ → 2AlCl₃ + 9O₂.

Explanation:

2Al(ClO₃)₃ → 2AlCl₃ + 9O₂.

That every 2.0 moles of aluminium chlorate is decomposed to produce 2.0 moles of aluminium chloride and 9.0 moles of oxygen.

The decomposition of aluminium chlorate ([tex]Al(ClO_3)_3[/tex]) to produce aluminium chloride ([tex]AlCl_3[/tex]) and oxygen gas ([tex]O_2[/tex]) can be represented by the following balanced chemical equation:

[tex]\[ 2 \text{Al(ClO}_3)_3 \rightarrow 2 \text{AlCl}_3 + 9 \text{O}_2 \][/tex]

To write the equation, we start with the reactants and products given in the question. Aluminium chlorate ([tex]Al(ClO_3)_3[/tex]) decomposes into aluminium chloride ([tex]AlCl_3[/tex]) and oxygen gas ([tex]O_2[/tex]). We need to ensure that the equation is balanced, meaning that the number of atoms of each element must be the same on both sides of the equation.

Starting with the aluminium atoms, we have one aluminium atom on both sides of the equation, so aluminium is balanced.

Next, we look at the chlorine atoms. There are three chlorine atoms in each [tex]Al(ClO_3)_3[/tex] molecule, for a total of six chlorine atoms in [tex]2Al(ClO_3)_3[/tex]. To balance the chlorine atoms on the product side, we need six chlorine atoms in the aluminium chloride, which gives us [tex]AlCl_3[/tex] for each aluminum atom, hence [tex]2AlCl_3[/tex].

Finally, we balance the oxygen atoms. There are nine oxygen atoms in each [tex]2Al(ClO_3)_3[/tex] (since there are three oxygen atoms in each [tex]ClO_3[/tex]group and we have six [tex]ClO_3[/tex] groups in total). To balance the oxygen atoms, we need nine oxygen atoms on the product side, which means we need 9/2 molecules of [tex]O_2[/tex], since each [tex]O_2[/tex] molecule contains two oxygen atoms. However, because we cannot have half a molecule, we multiply the entire equation by 2, resulting in 9 molecules of [tex]O_2[/tex].

This gives us the balanced equation:

[tex]\[ 2 \text{Al(ClO}_3)_3 \rightarrow 2 \text{AlCl}_3 + 9 \text{O}_2 \][/tex]

This equation correctly represents the conservation of mass, with an equal number of each type of atom on both sides of the reaction.

Answer:

Endothermic reaction.

Explanation:

Reactants + heat ↔ Products.

As the temperature cooled, it is like that decreasing the concentration of reactants side, that shifts the reaction towards the lift side (reactants side) to attain the equilibrium again.

So, the reaction is an endothermic reaction.

It is a subscript

Also do you mean Cl not Ci. I assume you do because then it means 4 chlorine in that compound.

This Kingdom is the Protists Kingdom.

Answer:

Protists kingdom

Explanation:

The Protista Kingdom is one of the kingdoms of living beings, characterized by eukaryotic, autotrophic or heterotrophic and unicellular or multicellular organisms. Protists comprise protozoa and algae. There are also myxomycetes, organisms similar to fungi, but classified as protists.

Despite all this diversity, this kingdom is best represented by the presence of protoariums that are, in the great majority, microscopic eukaryotic beings (have a library) and heterotrophic beings that live in aquatic and humid environments. They can live alone or form colonies with a differentiation of specialized reproductive cells.

frequency

hope this helps :)

Alias: Mercuric Hydrogen Carbonate; Mercury(II) Bicarbonate

Formula: Hg(HCO3)2

Molar Mass: 322.6237

= 29,898.4375 Kg

Volume of a prism is given by the formula;

V = base area × height

   = 1.25 m × 1.25 m × 2.15 m

   = 3.359375 m³

Density = 8.9 g/cm³

This is equivalent to ; 8900 kg/m³

Therefore;

Mass = Density × volume

         = 8900 kg/m³ × 3.359375 m³

         = 29,898.4375 Kg

Answer:

3.0 x 104 kg

Explanation:

Answer:

We add A Hydrogen

Explanation:

When we have a half-reaction in an acidic media usually we add (H+) hydrogen plus or protons to the reaction to balance in both sides of the reaction the amount of hydrogen.

After this step the next one is equilibrate the charges (e-) and finally we add the two half-reactions to write a short version

Answer:

hydrogen

Explanation:

Plato

The answer is A because all living things must contain a cell to be able to sustain life within

All organisms are composed of one or more cells that perform the basic functions of life.

Cells are the fundamental units of life.

i believe its A. the temperature of the liquid

I. An electric current can be produced by a changing magnetic force.

II. A magnetic force can be produced by an electric current.

Answer:

I. An electric current can be produced by a changing magnetic force.

II. A magnetic force can be produced by an electric current.

The d-block elements are found in groups 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 of the periodic table.

So your answer is A) Transition metals

Answer:

The answer is Transition metals they are the d-block elements.

Explanation:

The transition metals are called d-block due to these elements have electrons in the outer orbital d.

Orbitals in atoms: The atoms have electrons that are negative charged particles moving around the nucleus. The electrons are distributed in orbitals, each orbital has an energy value and representations with letters the lowest energy orbital is s, then p, d and f.

The d-orbital due to its energetic value can hold up to 10 electrons and these elements are important due to they are required for many organic, inorganic, biological and technological process.

For example: a d-block element is the Iron Fe who has magnetic properties and it is required for the human body to form hemoglobin ( protein needed for oxygen transport in cells.

Answer:

80.33 %.

Explanation:

Mg(s) + 2HCl(aq) → MgCl₂ + H₂.

n = mass/atomic mass = (1.50 g)/(24.3 g/mol) = 0.062 mol.

Using cross multiplication:

1.0 mol of Mg produces → 1.0 mol of hydrogen gas.

0.062 mol of Mg produces → 0.062 mol of hydrogen gas.

∵ PV = nRT.

∴ V of hydrogen (the theoretical yield) = nRT/P = (0.062 mol)(0.082 L.atm/mol.K)(295.0 K)/(1.0 atm) = 1.50 L.

The actual yield of the reaction = 1.205 L.

∴ The percent yield of the reaction = (actual yield)/(theoretical yield) x 100 = (1.205 L)/(1.50 L) x 100 = 80.33 %.

Final answer:

The theoretical yield of hydrogen gas at 295 K from reacting 1.50 g of magnesium with excess hydrochloric acid is 1.484 L. The percent yield, with an actual yield of 1.205 L of gas, is 81.19%.

Explanation:

Calculating Theoretical and Percent Yield

The student has asked to calculate the theoretical yield of hydrogen gas (in L) at 295 K for a reaction of 1.50 g magnesium with excess hydrochloric acid and then to determine the percent yield of the reaction given that 1.205 L of gas is produced.

To solve this, we first need to find the number of moles of magnesium (Mg) that will react. The molar mass of Mg is 24.305 g/mol, so:

Number of moles of Mg = Mass of Mg / Molar mass of Mg

= 1.50 g / 24.305 g/mol

= 0.0617 mol

According to the balanced chemical reaction, Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g), 1 mole of Mg produces 1 mole of H₂. Therefore, the number of moles of H₂ will also be 0.0617 mol.

Now, using the ideal gas law, PV = nRT, where P (pressure) = 1 atm (standard pressure), V is the volume, n is the number of moles of gas, R is the ideal gas constant (0.0821 L·atm/K·mol), and T is the temperature in Kelvin:
= 0.0617 mol × 0.0821 L·atm/K·mol × 295 K / 1 atm

= 1.484 L

This is the theoretical yield. The percent yield is calculated as:

Percent yield = (Actual yield / Theoretical yield) × 100%

= (1.205 L / 1.484 L) × 100%

= 81.19%

Answer:

B. Wood Burning

Explanation:

When you boil water, it is still water, just in vapor form

When glass breaks, it is still glass.

when frozen water (ice) melts, it is still water.

When you mold iron, it is still iron.

When you burn wood, it is not still wood. It is a new form of matter. It is ash.

I hope I helped!

Let me know if you need anything else!

~ Zoe

Final answer:

Reaction rate and reaction time have an inverse relationship.

Explanation:

The reaction rate refers to how fast a chemical reaction occurs, while the reaction time indicates the duration it takes for the reaction to happen. In general, there is an inverse relationship between reaction rate and reaction time. The faster the reaction rate, the shorter the reaction time, and vice versa. For example, if we compare two reactions, one with a fast reaction rate and the other with a slow reaction rate, the reaction with the fast rate will have a shorter reaction time.

There are approximately 9.033 x 10^23 atoms in 1.5 moles of iron. This is calculated by multiplying the number of moles by Avogadro's number.

The subject at hand involves calculations using Avogadro's number. Avogadro's number (6.022 x 1023) represents the number of atoms in a single mole of any substance. To calculate the number of atoms in a particular quantity of moles, you only need to multiply the amount of moles by Avogadro's number. Therefore, the number of atoms in 1.5 moles of iron would be 1.5 times Avogadro's number.

So, 1.5 (moles of iron) x 6.022 x 10^23 (atoms/mole) = 9.033 x 10^23 atoms of iron. Hence, there are about 9.033 x 10^23 atoms in 1.5 moles of iron.

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Under room temperature where [tex]\text{pK}_w = 14[/tex]:

3.) (A), (B), and (E).

4.) (D).

5.) (B).

What makes a buffer solution? For a solution to be a buffer, it needs to contain large amounts of a weak acid and its conjugate base ion. Alternatively, the solution may contain large amounts of a weak base and its conjugate acid ion.  

Not every one of the five solutions is a buffer solution.

Ethanoic acid CH₃COOH (a.k.a. acetic acid) is a weak acid. pKa = 4.756. CH₃COONa is a salt. It dissolves to produce CH₃COO⁻, which is the conjugate base ion of CH₃COOH. The solution in (A) contains equal number of CH₃COOH and CH₃COO⁻, both at 1.0 M.

Refer to the Henderson-Hasselbalch equation for buffers of weak acids.

[tex]\displaystyle \text{pH} = \text{pK}_a + \log{\frac{[\text{Conjugate Ion}]}{[\text{Weak Acid}]}}[/tex].

[tex]\displaystyle \log{\frac{[\text{Conjugate Ion}]}{[\text{Weak Acid}]}} =\ln{1} = 0[/tex].

The pH of the solution in (A) will be the same as the pKa of CH₃COOH. pH = 4.746.

Consider the hydrogen halides:

The radius of halogen atoms increases down the group, and hydrogen-halogen bond becomes weaker. It becomes easier for water to break those bonds. As a result, the strength of hydrogen halides increases down the group. HF is the only weak acid among the common hydrogen halides.

Mixing HBr and KBr at equal ratio will be similar to mixing HCl and KCl at the same ratio. All HBr in the solution breaks down into H⁺ and Br⁻. The pH of the solution will depend only on the concentration of HBr.

[tex]\displaystyle [\text{H}^{+}] = [\text{HBr}] \\\phantom{[\text{H}^{+}]}= \frac{n}{V} \\\phantom{[\text{H}^{+}]}= \frac{c(\text{HBr})\cdot V(\text{HBr})}{V(\text{HBr})+V(\text{KBr})}\\\phantom{[\text{H}^{+}]}=\frac{0.100\;\text{L}\times 1.0\;\text{mol}\cdot\text{L}^{-1}}{0.100\;\text{L}+0.100\;\text{L}} \\\phantom{[\text{H}^{+}]}= 0.50\;\text{mol}\cdot\text{L}^{-1}[/tex].

[tex]\text{pH} = -\log{[\text{H}^{+}] = -\log{0.50} \approx {\bf 0.30}[/tex].

Similarly to HCl and HBr, HI is also a strong acid. Mixing HI and NaOH at equal ratio will produce a solution of NaI, which is similar to NaCl. The final solution will be neutral. pH = 7 if pKw = 14.

NH₃ is a weak base. NH₄Cl dissolves completely to produce NH₄⁺ and Cl⁻. NH₄⁺ is the conjugate acid of NH₃. The final solution will contain an equal number of NH₃ and NH₄⁺. pKb = 4.75 for ammonia NH₃.

Apply the Henderson-Hasselbalch equation for buffers of weak bases:

[tex]\displaystyle \textbf{pOH} = \text{pK}_b + \log{\frac{[\text{Conjugate Ion}]}{[\text{Weak Base}]}}= 4.75 + \log{1} = 4.75[/tex].

Note that what this equation gives for buffers of weak bases is the pOH of the solution. pH = pKw - pOH. Assume that pKw = 14. pH = 14 - 4.75 = 9.25.

The solution in (E) will contain about 1.0 M of CH₃COOH. The volume of the solution will be 200 mL.

[tex]n(\text{CH}_3\text{COO}^{-}) = n(\text{NaOH}] = c\cdot V = 0.10\;\text{mol}[/tex].

[tex]\displaystyle [\text{CH}_3\text{COO}^{-}] = \frac{n}{V} = {0.10}{0.10 + 0.10} = 0.50 \;\text{mol}\cdot\text{L}^{-1}[/tex].

There's nearly no conjugate base of CH₃COOH. As a result, the solution will not be a buffer, and the Henderson-Hasselbalch Equation will not apply. Refer to an ICE table:

[tex]\begin{array}{c|ccccccc}\text{R}&\text{CH}_3\text{COO}^{-} &+&\text{H}_2\text{O}&\rightleftharpoons &\text{CH}_3\text{COOH}&+&\text{OH}^{-}\\\text{I}&0.50\\\text{C}& -x &&&& +x &&+x\\\text{E} &0.50 - x &&&&x&&x\end{array}[/tex]

The value of pKa is large. Ka will be small. the value of [tex]x[/tex] will be much smaller than [tex]0.50[/tex] such that [tex]0.50-x \approx 0.50[/tex].

The pKa of a weak acid is the same as pKw divided by the pKb of its conjugate base.

[tex]\displaystyle \frac{[\text{CH}_3\text{COOH}]\cdot[\text{OH}^{-}]}{[\text{CH}_3\text{COO}^{-}]} = \text{K}_b(\text{CH}_3\text{COO}^{-}) \\\phantom{\displaystyle \frac{[\text{CH}_3\text{COOH}]\cdot[\text{OH}^{-}]}{[\text{CH}_3\text{COO}^{-}]} }= \frac{\text{K}_w}{\text{K}_a(\text{CH}_3\text{COOH})} \\\phantom{\displaystyle \frac{[\text{CH}_3\text{COOH}]\cdot[\text{OH}^{-}]}{[\text{CH}_3\text{COO}^{-}]}} = \frac{10^{-14}}{1.75\times 10^{-5}} = 5.71\times 10^{-10}[/tex].

[tex]\displaystyle \frac{x^{2}}{0.50} =5.71\times 10^{-10}[/tex].

[tex][\text{OH}^{-}] = x \approx 1.69\times 10^{-5}\;\text{mol}\cdot\text{L}^{-1}[/tex].

[tex]\text{pH} = \text{pK}_w + \log{[\text{OH}^{-}]} = 9.23[/tex].

0.227 M

Volume of HCl = 25.5 mL or 25.5 / 1000 => 0.0255 L

Molarity or concentration of NaOH  = 0.113 M

Volume of NaOH  = 51.2 mL / 1000 = 0.0512 L

Number of moles NaOH:

Moles = Molarity x Volume

            = 0.113 x  0.0512

            = 0.0057856 moles of NaOH

From the equation we can obtain the mole ratio:

HCl + NaOH = NaCl + H2O

1 mole HCl : 1 mole NaOH

Therefore;

Moles of  HCl : 0.0057856 moles NaOH

Hence; moles of HCl  =  0.0057856 x 1 / 1

                                    =  0.0057856 moles of HCl

Molarity of  HCl = moles of HCL / Volume of HCl

                         M =  0.0057856 / 0.0255

                              = 0.227 M

Answer:

The energy of a photon depends on the frequency of the emission.

Explanation:

E = hν  

where E is the energy of a photon, ν   is the frequency of photon and h is Planck’s constant.  

Energy of a photon is quantized and is directly proportional to the frequency of the emission.  

Quantized energy of a photon explained the photoelectric effect. It was proven that light not has wave nature but particle nature as well. This later gave rise to wave particle duality of light waves.

#3 question D is Acid Rain

Lizards are reptiles that are closely related to snakes. Like all reptiles, lizards have scaly skin and are ectotherms—cold-blooded animals whose body temperature varies with the temperature of their surrounding environment. Most lizards are native to the tropics, but a number of species are found in temperate regions.Chameleons, iguanas, skinks, monitors, anoles, and geckos are some of the many different types of lizards.

A number of lizard species have adapted to life in the desert. Some desert lizards have toes fringed with spiny scales to help them run across the sand without sinking. Others burrow into the sand to escape the desert's intense heat, to hide from predators, or to search for small animals that they prey upon. Some burrowing lizards even have clear scales on their eyelids that protect their eyes but still allow them to see while they move under the sand.

I hope you find it helpful!!!!!

C) Energy exists in a field.

C energy exists in a field

2:2

ioudhfihsOIUDHFIUOSAHD

The mole ratio of reactants and products is learned by comparing the coefficients of the balanced equation. The current equation is unbalanced, so adding some coefficients to help balance the reactants and products is necessary.

2H2 + O2 —— 2H2O

In this equation, you can count the number of hydrogens and oxygens on each side to verify that there are the same on each. Now, compare the coefficients:

2H2:2H2O

2:2

The mole ratio of hydrogen to water is 2:2, simplified to 1:1. Choosing which ratio is to be used is dependent on the context of the question, however both are technically correct.

Answer:A) mL / s

Explanation:This is the amount of milliliters per second

The mass of 50 carbon atoms is   [tex]\bold{99.07\;\times\;10^{-23}}[/tex] amu, and the mass of 50 hydrogen atoms is [tex]\bold{8.30\;\times\;10^{-23}}[/tex] amu.

The mass of an atom can be given by the Avogadro law.

According to the Avogadro law, 1 mole of an element is composed of [tex]\rm 6.023\;\times\;10^{23}[/tex] atoms. The molar mass of an element is the mass of a mole of substance.

Thus, the mass of atoms can be given by:

[tex]\rm 6.023\;\times\;10^2^3\;atoms=molar\;mass[/tex]

Molar mass of carbon is 12 amu.

[tex]\rm 6.023\;\times\;10^2^3\;Carbon\;atoms=12.01\;amu\\\\50\;Carbon\;atoms=\dfrac{12.01}{6.023\;\times\;10^2^3}\;\times\;50\;amu\\\\50\;Carbon\;atoms=99.70\;\times\;10^{-23}\;amu[/tex]

The mass of 50 carbon atoms is [tex]99.70\;\times\;10^{-23}[/tex] amu.

Molar mass of hydrogen is 1 amu.

[tex]\rm 6.023\;\times\;10^2^3\;Hydrogen\;atoms=1\;amu\\\\50\;Hydrogen\;atoms=\dfrac{1}{6.023\;\times\;10^2^3}\;\times\;50\;amu\\\\50\;Hydrogen\;atoms=8.30\;\times\;10^{-23}\;amu[/tex]

The mass of 50 hydrogen atoms is [tex]8.30\;\times\;10^{-23}[/tex] amu.

Learn more about mass of an atom, here:

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Heat describes humidity

Your answer would be Option A. Energy is transferred.

I just took this quiz, and can 100% confirm this is the answer.

Hope this helps! :)  

When a mechanical wave travels through a medium, it transfers energy from one particle to another causing them to vibrate. The particles do not travel with the wave but rather vibrate about a central point.

When a mechanical wave travels through a medium such as air, water, or a solid material, the primary process is the transfer of energy. The mechanical wave causes particles in the medium to vibrate back and forth, thereby transferring energy from one particle to the next. However, it's important to note that while energy is transferred, the particles themselves don't travel with the wave but rather vibrate about a central point. This is different from losing, gaining or fluctuation of energy, but rather it's a consistent transfer of energy from one place to another.

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Washing your hands before eating?

Answer:

Inflammation.

Explanation:

The same reason you would die if your body temperature gets too high. Our bodies are meant to perform at an optimal temperature because the cells within our body perform cellular processes perfectly at that temperature. Same goes with bacteria. At high temperatures, proteins degrade and denature and fail to function. Your membrane transport proteins break apart: you can't get things in or out of your cells. You can no longer establish electron gradients for ATP synthesis: your body can no long provide itself with energy. Your ribosomes denature and fail to carry out protein synthesis: you cannot build new cells to replace the dying ones. You are dead.

Since mole ratio of magnesium to hydrochloric acid is 1:2, the answer is 1 mole of HCL.

The moles of hydrochloric acid are needed to react with O.50 mole of magnesium is 1 mole

The amount of substance which contains same number of atoms, molecules or ions as the number of atoms present in 12 g of carbon (C-12) is called a mole.

1 mol = 6.023 * 10²³ atoms

In the question

An equation Mg +2HCl --> MgCl₂+H₂ is given

It is asked that  moles of hydrochloric acid  needed to react with O.50 mole of magnesium = ?

It can be seen that the equation given is balanced as the number of atoms of the elements in the reactants is equal to the atoms in the products.

The mole ratio of Mg to HCl is 1 : 2

The mole of Magnesium is 0.5

Therefore the mole of HCl required to react will be  1 mol

To know more about Mole

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Final answer:

To balance a chemical equation, follow these steps: Determine the correct formulas, count the number of atoms, balance the elements one at a time, check the balance, and reduce coefficients if needed.

Explanation:

In order to balance a chemical equation, you can follow the steps below: