Gordon wrote this passage about mechanical waves for his physics class. But he got most of his facts mixed up. Only one sentence is correct. Which sentence is it?

A) Mechanical waves don’t need a medium to travel. When they travel through a vacuum, mechanical waves are oval-shaped. They’re either transverse or double transverse waves.

B) Mechanical waves can apply pressure to and push on objects in their path.

C) But they travel slower in denser mediums.

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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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.

To find the number of grams of H2 in 1470 mL of H2 gas, convert the volume from mL to L, calculate the number of moles using the molar volume at STP, and then find the mass of H2 gas using stoichiometry and the molar mass of H2.

To determine the number of grams of H2 in 1470 mL of H2 gas, we need to use the concept of molar mass and stoichiometry. The molar mass of H2 is 2 g/mol, which means that one mole of H2 gas weighs 2 grams. We can use the molar volume of gases at STP (standard temperature and pressure), which is approximately 22.4 L/mol, to convert the volume of the gas into moles. From there, we can use stoichiometry to determine the mass of H2 gas in grams.

First, convert the volume of the gas from milliliters to liters by dividing by 1000. 1470 mL is equal to 1.47 L. Using the molar volume of gases at STP, we can find the number of moles: 1.47 L / 22.4 L/mol = 0.0656 mol.

Since each mole of H2 gas weighs 2 grams, the mass of H2 gas in grams is: 0.0656 mol * 2 g/mol = 0.1312 g.

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The number of grams of H₂ in 1470 mL of H₂ gas is calculated to be 0.1312 grams.

To find the number of grams of H₂ in 1470 mL of H₂ gas, we need to use the ideal gas law, which is:

PV = nRT

Where:

For this calculation, we assume the gas is at standard temperature and pressure (STP; 0°C and 1 atm), where 1 mole of an ideal gas occupies 22.4 L.
First, convert the volume from mL to L:

1470 mL = 1.470 L

At STP, 1 mole of H₂ gas occupies 22.4 L. Thus, the number of moles of H₂ gas is:

n = V / 22.4 L = 1.470 L / 22.4 L/mol = 0.0656 mol

Next, we find the mass using the molar mass of H₂ (2 g/mol):

Mass = n × molar mass = 0.0656 mol × 2 g/mol = 0.1312 g

Therefore, the number of grams of H₂ in 1470 mL of H₂ gas is 0.1312 grams.

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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I believe the correct answer is B

Final answer:

The Big Bang theory posits that the universe began as a highly compressed, hot, and dense state roughly 13.7 billion years ago, later expanding and cooling to its current form, with the cosmic microwave background (CMB) serving as a key piece of evidence.

Explanation:

The Big Bang theory states that the universe began as a small, dense ball of matter. This is often described as a hot, dense state, which then underwent rapid expansion and cooling to arrive at its present condition. According to this theory, the universe started about 13.7 billion years ago, and it continues to expand and cool today. The cosmic microwave background (CMB) is a critical piece of evidence supporting the theory, as it is the redshifted afterglow of the Big Bang and can be observed from any direction in space.

Contrary to the Big Bang being an explosion of matter into space, it is more accurately the expansion of space itself, with the universe's density decreasing over time as it expands. This expansion continues to be a subject of study, including whether the universe will eventually stop expanding and begin contracting in a 'big crunch' or continue to expand indefinitely, an idea connected to concepts like the cosmological constant and dark energy.

frequency

hope this helps :)

Alias: Mercuric Hydrogen Carbonate; Mercury(II) Bicarbonate

Formula: Hg(HCO3)2

Molar Mass: 322.6237

2:2

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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.

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.

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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.

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.

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.

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:

The general formula for “Double Replacement” would beAB+CD —> AD+CB.

I really hope this helps you.

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

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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.

C) Energy exists in a field.

C energy exists in a field

Heat describes humidity

The term describes a trace, print, or remain of an organism preserved over time in a rock is fossil. Therefore, option B is correct.

Any surviving remains, impression, or evidence of a once-living thing from a previous geological epoch is referred to as a fossil. Examples include exoskeletons, bones, shells, animal or microbe imprints in stone, items preserved in amber, hair, petrified wood, and DNA traces. The fossil record is the collection of all fossils.

The majority of fossils are created when a living thing (such as an animal or plant) dies and is swiftly buried by sediment (such as mud, sand or volcanic ash).

The preserved remnants of plants and animals that were submerged in sediments like sand and mud beneath ancient seas, lakes, and rivers are known as fossils. Any preserved sign of life that is typically more than 10,000 years old is considered a fossil.

Thus, option B is correct.

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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.

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%

This implies, for instance, that 1 kilogram of matter is equivalent to an energy E = (1 kg)×(3×108 m/sec)2 = 9×1016 kg m2/sec2. An energy of 1 kg m2/sec2 is known as 1 joule, for short.

#3 question D is Acid Rain

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:

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.

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].

Answer:A) mL / s

Explanation:This is the amount of milliliters per second

It is a subscript

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

NOT 100% SURE

Thermal Energy..?

When I think of three states of matter I think of water as an example:

• Adding extreme heat to the liquid form of water can turn it into gas.

• Adding heat to ice can turn it into the liquid form of water.

• Freezing the liquid form of water can turn it into ice.

I would say temperature (thermal energy) has an effect of the different states of matter.