19. Luke wants to create an aqueous solution that conducts electricity. Which of the following compounds should
he use?
a) KNO3
b) C12H22O11
c) C2H5OH
d) NH4OH

The calcium ion has 18 protons, 20 neutrons, and 20 electrons.
The relationship between the components a and b is Inverse proportion.


The calcium ion (Ca2+) has a 2+ charge, indicating that it has lost 2 electrons from its neutral state. To determine the number of protons, neutrons, and electrons in the calcium ion, we need to consider its atomic number and mass.

The atomic number of calcium is 20, which indicates that it has 20 protons. Since the calcium ion has a 2+ charge, it means it has lost 2 electrons. Therefore, the number of electrons in the calcium ion is 20 - 2 = 18.

The mass number of calcium is 40 amu, which represents the total number of protons and neutrons. Since the calcium ion has 20 protons, the number of neutrons can be calculated as 40 - 20 = 20.

So, the correct option is: d. 18 protons, 20 neutrons, and 20 electrons

In the expression a∼1/b, the relationship between the components a and b is an inverse proportion. This means that as the value of a increases, the value of b decreases, and vice versa. The symbol ∼ represents the proportional relationship between a and 1/b, indicating that they are inversely related. Therefore, the correct answer is: Inverse proportion

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The balanced equation for the chemical equation given in the question above is: 2Cr(s) + 3Cl₂(aq) → 2CrCl₃(s)

The following data were obtained from the question:

Chemical equations are generally balanced by ensuring that the number of atoms of each element present on both sides of the equation are equal.

Now, we shall balance the equation given from the question as follow:

Cr(s) + Cl₂(aq) → CrCl₃(s)

There are 2 atoms of Cl on the left side and 3 atoms on the right side. It can be balanced by writing 2 before CrCl₃ and 3 before Cl₂ as shown below:

Cr(s) + 3Cl₂(aq) → 2CrCl₃(s)

There are 2 atoms of Cr on the right side and 1 atom on the left side. It can be balanced by writing 2 before Cr as shown below:

2Cr(s) + 3Cl₂(aq) → 2CrCl₃(s)

Thus, the equation is balanced.

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Answer:

Limiting reactant: lead(II) nitrate (Pb(NO3)2).

Mass of sodium nitrate (NaNO3) = 12.92 g.

Explanation:

What is given?

Mass of lead (II) nitrate (Pb(NO3)2) = 25 g.

Mass of sodium iodide (NaI) = 30 g.

Molar mass of Pb(NO3)2 = 331 g/mol.

Molar mass of NaI = 150 g/mol.

Molar mass of sodium nitrate (NaNO3) = 85 g/mol.

Step-by-step solution:

First, let's state the balanced chemical equation. Lead (II) nitrate (Pb(NO3)2) reacts with sodium iodide (NaI) in a double-replacement reaction to produce sodium nitrate (NaNO3), and PbI2:

Now, let's calculate the number of moles of each reactant using its molar mass. The conversion from grams to moles for Pb(NO3)2 will look like this:

And for NaI:

The next step is to see how many moles of NaNO3 are being produced. We're going to need the chemical equation: let's start with Pb(NO3)2. 1 mol of Pb(NO3)2 reacted produces 2 moles of NaNO3, so we will obtain:

And now, let's see that 2 moles of NaI reacted produce 2 moles of NaNO3, so the molar ratio between these compounds is 1:1, which means that 0.20 moles of NaI reacted will produce 0.20 moles of NaNO3 too:

Based on these calculations, you can note that the limiting reactant would be Pb(NO3)2 because this compound imposes the limit because is being consumed first, it is producing the maximum amount of NaNO3 that we can produce in this reaction.

The final step is to calculate the mass of NaNO3 that is being produced. Remember as Pb(NO3)2 is the limiting reactant and it produces 0.152 moles of NaNO3, we use this data to find the mass of NaNO3 using its given molar mass too, like this:

The answer is that the limiting reactant is lead (II) nitrate (Pb(NO3)2) and we're producing 12.92 g of sodium nitrate (NaNO3).

Answer:

false

Explanation:

Answer:

False.

Explanation:

The sum of potential energy and the kinetic energy of an object is mechanical energy.

Hope that this helps!!! :)

Explanation:

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Answer:

C

Explanation:

 i hope i helped you and have a nice day...

Answer:

A

Explanation:

Answer:

The magnesium atom is larger.

Explanation:

The magnesium atom is larger because it is on the left side of the Periodic Table (period 3 and group 2) where the atomic radius is larger.

Atomic radius is the distance from the center of the nucleus of an atom to the most external electron shell.

The greater the columbic attractions, the closer the protons in the nucleus are to the electrons in the outer layers, making the size of the atom smaller.

To calculate concentration we use -

\( \:\:\:\:\:\:\:\:\:\:\:\star\longrightarrow \sf \underline{C=\dfrac{n}{V}}\\\)

\( \:\:\:\:\:\:\:\:\:\:\:\star\longrightarrow \sf \underline{n = C\:V}\\\)

Where -

We are given the volume and the concentration of the KOH. Using those information, we can calculate the moles of KOH.

Given data:-

Volume of KOH, V= 27.4mL = 27.4×10⁻³ L

\(\star\)Concentration of KOH, C= 1 M

\( \:\:\:\:\:\:\longrightarrow \sf Moles \:of \:KOH = C\:V\\\) 

\( \:\:\:\:\:\:\longrightarrow \sf Moles \:of \:KOH = 1\times 27.4 ×10⁻³\\\) 

\( \:\:\:\:\:\:\longrightarrow \sf Moles \: of \: KOH = 0.0274  \\\)

The neutralization reaction is expressed as:-

\( \star\longrightarrow \sf\underline{ \pink{2KOH} + \pink{H_2SO_4} = K_2SO_4 + 2H_2O}\\\)

According to this reaction, 2 moles of KOH reacted with 1 mole of H₂SO₄.Therefore, 0.0274 mole of KOH would also react with (0.0274/2)=0.0137 mole of H₂SO₄.

\( \:\:\:\:\:\:\longrightarrow \sf Concentration\: of\: H₂SO₄ =\dfrac {Moles\:of\:H₂SO₄}{ Volume \: of \: H₂SO₄}\\\)

\( \:\:\:\:\:\:\longrightarrow \sf Concentration\: of\: H₂SO₄ =\dfrac {0.0137}{ 25×10⁻³  }\\\)

\( \pink{\because\sf \underline{ Volume\: of \: H₂SO₄= 25 mL = 25×10⁻³ L}}\\\)

\( \:\:\:\:\:\:\longrightarrow \sf Concentration\: of\: H₂SO₄ =\dfrac {0.0137}{ 0.025 }\\\)

\( \:\:\:\:\:\:\longrightarrow \sf \underline{Concentration\: of\: H₂SO₄ = 0.548\: M}\\\)

Therefore, the concentration of H₂SO₄ is 0.548M.

Answer:

To get from DNA, written in one chemical language, to protein, written in another, requires two major stages, transcription and translation.

Explanation:

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When an acid such as hydrochloric acid (HCl) reacts with a metal like zinc (Zn), the gas produced is hydrogen gas (H₂).

When hydrochloric acid (HCl) reacts with zinc (Zn), something interesting happens. The acid gives away its hydrogen atoms (H⁺) to the zinc. At the same time, the zinc gives away some of its electrons. As a result, hydrogen gas (H₂) is produced. The gas forms little bubbles that you might see during the reaction. The remaining zinc combines with the chlorine atoms (Cl⁻) from the acid to form zinc chloride (ZnCl₂). So, to sum it up, when acid (like HCl) and metal (like zinc) react, they create hydrogen gas and a compound called zinc chloride. The hydrogen gas bubbles out, and the zinc chloride dissolves in the remaining acid.

A single displacement reaction, also known as a metal-acid reaction, occurs when hydrochloric acid (HCl) and zinc (Zn) are in contact. This reaction results in the creation of zinc chloride (ZnCl₂) and hydrogen gas (H₂) as the zinc metal displaces the hydrogen in the hydrochloric acid. While the acid's hydrogen ions lose electrons and undergo oxidation, the zinc atoms acquire electrons and undergo reduction. It is a redox (reduction-oxidation) reaction because it includes both oxidation and reduction reactions.

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i cant understand your question define briefly

The formal charge of an atom in a molecule or polyatomic ion can be calculated using the following equation:

Formal Charge = Valence electrons - Non-bonding electrons - 1/2 (Bonding electrons)

where:

Valence electrons are the number of electrons an atom has in its outermost (valence) shell.

Non-bonding electrons are the number of electrons that an atom has which are not involved in bonding with other atoms in the molecule.

Bonding electrons are the number of electrons that an atom shares with other atoms in covalent bonds.

To use the equation, first count the number of valence electrons for the atom in question. Then count the number of non-bonding electrons on the atom, as well as the number of electrons that the atom shares in covalent bonds with other atoms. Finally, plug these numbers into the equation to calculate the formal charge.

The formal charge can help to determine the most stable arrangement of electrons in a molecule or ion. In general, atoms with a formal charge of zero or close to zero are more stable than those with higher formal charges.

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A dark colored peppered moths has a better survival rate in the forest than a light colored peppered moth due to their color difference which exposes the moths to predators.

Why do color matter in peppered moths?

Peppered moths usually have white with black spots across the wings. Organisms like to camouflage to boost their survival rate as they will be able to blend with the environment in other to evade predators.

The  dark colored peppered moths have the ability to evade predators more due to their color, as they can easily blended in with the dark tree trunks and the forest. While the light peppered moths will be easily picked by predators because of their color.

In summary, peppered moths are found in places like the tree trunks, dark forest where they can feed on leaves of some trees. The color of their wings has the ability to boost their survival chances.

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Explanation:

Actually the total abundant of isotopes of any element in the world must sum up to 100 percent. So we initially know that 12c is 98.9 percent. Therefore the remaining of the remains of 100 must be 12

3c = 100%- 98.9

13c= 1.1%

the area of one of the cat's paws is 4 square centimeters.

The weight of the cat is 4.0 kilograms, which is the force exerted on the scale by the cat's body. The weight per unit area on the scale due to the cat's paws is 0.25 kilograms per square centimeter.

Let A be the area of one of the cat's paws in square centimeters. The weight of the cat is supported by all four paws, so the total force exerted by the paws on the scale is:

force = weight = 4.0 kg

The force exerted by one paw is one-fourth of the total force:

force per paw = force / 4 = 4.0 kg / 4 = 1.0 kg

This force is distributed over the area of one paw, so we can write:

pressure = force per paw / A

where pressure is the weight per unit area, which is given as 0.25 kg/cm

Substituting the values and solving for A, we get:

0.25 kg/cm = 1.0 kg / A

A = 1.0 kg / 0.25 kg/cm = 4 cm

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The answer is e) 1.84 x 102 g. This means that 184.16 grams of table salt are needed to provide 72.0 grams of sodium.

Table salt, also known as sodium chloride, is a common chemical compound used in various applications. It is composed of two elements: sodium and chlorine, with sodium accounting for 39.1% of the compound's mass. In this problem, we are asked to determine how many grams of table salt are needed to provide 72.0 grams of sodium.

To solve this problem, we can use the information that table salt is 39.1% sodium by mass. This means that in every 100 grams of table salt, 39.1 grams is sodium. We can use this proportion to determine how much table salt is needed to provide 72.0 grams of sodium.

Let x be the amount of table salt (in grams) needed to provide 72.0 grams of sodium. Using the proportion, we can set up the following equation:

39.1/100 = 72.0/x

To solve for x, we can cross-multiply and simplify:

39.1x = 7200

x = 7200/39.1

x ≈ 184.16

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Answer:

a)calcium nitrate + hydrogen

b) sodium sulfate+ water.

c)barium chloride +carbon dioxide+hydrogen

d) magnesium phosphate +water

e) chlorine+aluminum = aluminum chloride + water

f) potassium bicarbonate +sulphuric acid=potassium sulfate +water +carbon dioxide

According the question the Percent yield is 11.99%

Yield is an economic term referring to the income generated by an investment over a period of time. It is usually expressed as a percentage of the initial investment and is calculated by taking the total income earned and dividing it by the initial investment. Yield is an important measure of the performance of an investment, and is a key factor in determining the attractiveness of an investment. Yields can be calculated for individual investments, or for portfolios of investments. Yields can also be calculated for different types of investments, such as stocks, bonds, and mutual funds. Yields are also used to compare investments with different levels of risk, so investors can make informed decisions about their investments. Yields are affected by a variety of factors, including interest rates, inflation, and market conditions.

The percent yield can be calculated using the formula:

Percent yield = (Actual yield / Theoretical yield) * 100

For Magnesium Chloride, the theoretical yield is 14.87 moles, and the actual yield is 1.78 moles.

Therefore, the percent yield is:

Percent yield = (1.78 / 14.87) * 100 = 11.99%

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The percent composition of anhydrous salt (MgBr2) is approximately 74.95%.

Anhydrous salt refers to the salt which doesn’t have any water molecules attached to its structure. MgBr2.6H2O is an example of hydrated salt. The formula states that there are six moles of water for every one mole of magnesium bromide. The formula mass of MgBr2.6H2O (hydrated salt) can be calculated by adding the formula mass of the anhydrous salt to the formula mass of six water molecules. So, the formula mass of the hydrated salt is:MgBr2.6H2O = 24.31 + (2 × 79.90) + (6 × 18.02) = 245.43 g/mol The formula mass of MgBr2 (anhydrous salt) is 24.31 + (2 × 79.90) = 184.11 g/mol.

The mass of water in the hydrated salt is 61.32 g/mol (6 × 18.02 g/mol).The percent composition of anhydrous salt MgBr2 in hydrated salt MgBr2.6H2O can be calculated by dividing the mass of anhydrous salt by the mass of hydrated salt and multiplying by 100. Therefore, the percent composition of anhydrous salt in hydrated salt is: Mass percent of MgBr2 = (184.11/245.43) × 100% ≈ 74.95%.

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The minimum number of theoretical (equilibrium) stages required to achieve the separation of 45 kg/hr of 50 mol% benzene in toluene entering as a saturated liquid into streams of 85 mol% benzene and 90 mol% toluene is 10.

To determine the minimum number of theoretical (equilibrium) stages required to achieve this separation, we can use the McCabe-Thiele method.

First, draw the equilibrium curve for the benzene-toluene system using the given compositions. The equilibrium curve represents the compositions of the vapor and liquid phases in equilibrium at each stage of the separation.

Next, draw a diagonal line representing the feed composition on the graph. The point where this line intersects the equilibrium curve is the point where the feed is in equilibrium with the vapor leaving the first stage. From this point, draw a horizontal line to the y-axis (representing the mole fraction of benzene) to find the composition of the vapor leaving the first stage. This composition is higher in benzene than the feed composition, indicating that the vapor is enriched in benzene compared to the liquid.

Repeat this process for each subsequent stage, drawing a diagonal line from the previous stage's vapor composition to the equilibrium curve, and then drawing a horizontal line to find the composition of the vapor leaving the current stage. Continue until the composition of the vapor leaving the final stage (which should be at least 85 mol% benzene) is reached.

Count the number of stages required to achieve this separation. In this case, the minimum number of theoretical (equilibrium) stages required to achieve this separation is approximately 10.

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Answer:

9.2% is the answer

Explanation:

In this question asking for the percent error of the students calculated density. The formula that will be given;

density = 9.78g/cm^3

d = 9.78g/cm^3

accepted is on the RT table S = 8.96g/cm^3

%error = (measured - accepted)/accepted * 100%

%error = (9.78 - 8.96/8.96) * 100%

%error = 9.15% or approximately 9.2%

Answer:3

Explanation:

The most abundant component of the atmospheres of Uranus and Neptune is methane, which is represented by the chemical formula CH4.

Uranus and Neptune are known as ice giants and their atmospheres are primarily composed of hydrogen and helium. However, methane is the most abundant component after hydrogen and helium. Methane makes up about 2.3% of Uranus' atmosphere and about 1.5% of Neptune's atmosphere. The presence of methane gives these planets their characteristic blue color as it absorbs red light and reflects blue light. The remaining components of the atmospheres of Uranus and Neptune are made up of trace amounts of ammonia, water vapor, and other gases.

In conclusion, the most abundant component of the atmospheres of Uranus and Neptune is methane, which is responsible for their distinctive blue color. While hydrogen and helium are the primary components of their atmospheres, methane makes up a significant percentage and is essential in understanding the composition and characteristics of these ice giants.

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One common test for carbon dioxide (CO2) is the limewater test. Here's how it works:

Add a small amount of limewater (a solution of calcium hydroxide in water) to a clear container.

Blow into the container, creating bubbles in the limewater.

Observe the limewater. If carbon dioxide is present, it will react with the calcium hydroxide to form calcium carbonate, which will make the limewater turn cloudy or milky.

This test is often used to detect the presence of carbon dioxide in the breath of a person, as well as in various chemical reactions where carbon dioxide may be produced or consumed.

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Answer:

No

Explanation:

There is only one Nitrogen on the left side while there are 2 on the right. Also there is zero oxygen on the left side and two on the right. The amounts of hydrgen arent equal to each side either.

Answer:

Something that's interdisciplinary covers more than one field of study. If you take an interdisciplinary science and literature class, you might read a science fiction novel and then explore the scientific ideas behind it. ... Interdisciplinary means between fields, but they don't have to be unrelated disciplines.

Explanation:

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The new freezing point of the solution is 1.09 °C.

Based on the given information, the freezing point of pure water is 0.0 °C, and the freezing point changes by 1.09 °C. To find the new freezing point of the solution, we need to add the change in freezing point to the freezing point of pure water.

0.0 °C + 1.09 °C = 1.09 °C

Therefore, the new freezing point of the solution is 1.09 °C.

When performing calculations with significant figures, it's important to consider the rule for addition and subtraction. According to this rule, the result should be rounded to the least number of decimal places among the values being added or subtracted. In this case, both the freezing point of pure water (0.0 °C) and the change in freezing point (1.09 °C) have one decimal place. Thus, the final answer is also rounded to one decimal place, resulting in a new freezing point of 1.1 °C.

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