Which is an example of potential energy?

A
Water behind a dam

B
A dart stuck in a dartboard

C
Plants using photosynthesis

D
A cow chewing grass

Dipole moment is present between atoms that have differences in their electronegativity. These atoms have unequal distribution of positive and negative charges.  

CO₂, BF₃, CCl₄, and BeF₂ have zero dipole moments because the atoms present in these molecules cancel each other's dipole moments and have overall net zero dipole moments.  

CO₂ is a linear and symmetrical molecule. The molecule has two C=O bonds, which are present in opposite directions. The dipole moment of one C=O bond cancels the dipole moment of the other.  

In BF₃, all three B-F bonds have slightly negative charges on fluorine atoms. The charges are balanced in the symmetrical triangular shape of the molecule. Therefore, the dipole moments of the three bonds cancel each other.  

Similarly, CCl₄ and BeF₂ have overall zero dipole moments because these have regular symmetrical structures.

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The empirical formula is HgCl₂, which is mercuric chloride, as it indicates that the ratio of mercury to chlorine in the compound is 1:2.

To determine the empirical formula of a compound containing mercury and chlorine, we need to convert the percentage composition by mass into mole ratios. Assuming a 100-gram sample, the mass of each element can be determined, and the corresponding number of moles can be calculated using their atomic masses. Dividing the number of moles of each element by the smaller value and multiplying to get whole-number ratios yields the empirical formula. In this case, the empirical formula is HgCl₂, which is mercuric chloride, as it indicates that the ratio of mercury to chlorine in the compound is 1:2.

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Complete question:

Mercury forms a compound with chlorine that is 73.9% mercury and 26.1% chlorine by mass. what is the empirical formula?

If the radius of the bowl is 10 and the depth of the water is 16 inches, the area of the surface of the water in the fish bowl is approximately 1,005 square inches.

To determine the surface area of the water in a fish bowl, we must first calculate the volume of the water. The fish bowl is in the shape of a sphere, so we can use the formula for the volume of a sphere, which is 4/3 πr^3. In this case, the radius of the bowl is 10 inches, so the volume of the water is 4/3 × 3.14 × 10^3, which equals approximately 4,188.8 cubic inches.

Next, we need to calculate the surface area of the water. Since the water level is 16 inches deep, we can use the formula for the surface area of a sphere segment, which is 2πrh, where r is the radius of the sphere and h is the height of the segment. In this case, the radius of the sphere is 10 inches and the height of the segment is 16 inches. Plugging these values into the formula, we get 2 × 3.14 × 10 × 16, which equals approximately 1,005 square inches.

Therefore, the area of the surface of the water in the fish bowl is approximately 1,005 square inches.

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Answer:

The greater the energy required to break a bond, the stronger that bond must be.

Explanation:

Most iconic bonds are considerably stronger, more difficult to break, than covalent bonds.

Hope this helps! :) x

To decay 44 mg sample strontium to a mass of 11 mg it will take 56 years. A silvery metal called strontium is a naturally occurring, non-radioactive element.

The chemical element strontium has the atomic number 38 and the symbol Sr. Strontium is a soft, silver-white, yellowish metallic element that is an alkaline earth metal and has a strong reactivity to chemicals. When the metal is exposed to air, a thick layer of dark oxide forms.

Most people associate strontium with the vivid red colours that its salts give to fireworks and flares. Creating ferrite magnets and purifying zinc are two further uses for it. Strontium aluminate is a component of contemporary polymers and "glow-in-the-dark" paints.

According to studies, taking strontium supplements may help decrease bone pain, boost bone mineral density, and lower the risk of some fractures. More. Both bone formation and bone breakdown may be influenced by strontium.

In 28 years, you will have (1/2)(44)=22 mg left.

After another 28 years, you will have (1/2)(22)=11 mg left.

Total time to 11 mg = 56 years.

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a) Subscript (s) means solid or precipitate.

b) CdSO₄ (aq) → Cd²⁺ (aq) + SO₄²⁻(aq) and K₂S(aq) → 2K⁺ (aq) + S²⁻ (aq). There are 4 types of ions present in the solution Cd²⁺, SO₄²⁻, 2K⁺ and S²⁻.

c) Yellow to orange color precipitate will be seen after this reaction.

d) The reaction is known as double displacement or a precipitation reaction.

e) 2K⁺ and SO₄²⁻ are the ions still present in the solution.

The detailed answer to the questions related to the given equation are as follows:

Given equation: CdSO₄ (aq) + K₂S (aq) → CdS (s) + K₂SO₄ (aq)

a) The subscript (s) means "solid." In this reaction, CdS is a solid product formed by the reaction of aqueous CdSO₄ and K₂S.

b) When cadmium sulfate (CdSO₄) dissolves in water, it dissociates into ions:

CdSO₄ (aq) → Cd²⁺ (aq) + SO₄²⁻ (aq)

Similarly, when potassium sulfide (K₂S) dissolves in water, it dissociates into ions:

K₂S (aq) → 2K⁺ (aq) + S²⁻ (aq)

In this solution, there are four types of ions are present: Cd²⁺, SO₄²⁻, 2K⁺, and S²⁻.

c) Cadmium sulfide (CdS) has a yellow to orange color and is insoluble in water. When you mix cadmium sulfate (CdSO₄) and potassium sulfide (K₂S), you would expect to see a yellow to orange precipitate forming, which is cadmium sulfide (CdS).

d) The name for this type of reaction is a double displacement reaction or a precipitation reaction.

e) After the reaction, the soluble product potassium sulfate (K₂SO₄) is formed, which dissociates into ions in the solution. The ions still present in the solution after the reaction are: 2K⁺ (aq) + SO₄²⁻ (aq).

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Answer:

10 meters per second

Explanation:

The name of binary ionic cpd composed of the lithium cation and the chlorine anion is called Lithium chloride (LiCl). In Chemistry, the lithium chloride is an ionic compound consisting of lithium and chlorine.

It has a white or colourless solid structure in the form of a crystal. The lithium chloride formula is LiCl. It is a compound that is highly soluble in water and its solutions conduct electricity. Lithium chloride is used as a desiccant, a flux for welding and soldering, and a starting material in the synthesis of various other lithium compounds.

It is also used as an important reagent in organic synthesis. It is also useful in the production of ceramics and in the manufacture of lithium-ion batteries. In conclusion, the name of the binary ionic cpd consisting of the lithium cation and chlorine anion is Lithium chloride (LiCl).

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Answer:

225kg.m.s

Explanation:

Momentum equals to mass times velocity

The molarity of the solution of 0.065 grams of NaCl in enough ethanol \((CH_3CH_2OH)\) to give 100 ml of solution is 0.11 M.

The molarity of a solution is defined as the number of moles of solute per liter of solution. To calculate the molarity, we need to know the number of moles of solute present in the solution and the volume of the solution.

First, we need to find the number of moles of solute. We can do this by using the formula:

moles of solute = mass of solute / molar mass of solute

The molar mass of NaCl is 58.44 g/mol, so we can use this to calculate the number of moles of NaCl in 0.065 g of NaCl:

moles of NaCl = 0.065 g / 58.44 g/mol = 0.0011 mol

Next, we need to find the volume of the solution. We know that the solution has a volume of 100 ml. We will assume that the density of ethanol is close to the density of water which is 1g/ml, so we can assume that the volume of the solution is equal to the mass of the solution.

Finally, we can calculate the molarity of the solution:

molarity = moles of solute/liters of solution

molarity = 0.0011 mol / 0.1 L = 0.11 M

So the molarity of the solution is 0.11 M.

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Answer:

10 hours

Explanation:

Answer:

10

Explanation:

Answer:

5.850 kJ (of heat energy)

Explanation:

What we need:

[] The mass of the material = m = 32.5g  

[] The temperature change that occurs = ΔT = 43

() 75 - 34 = 43  

[] The specific heat capacity of the material = c

() This is the amount of heat required to raise 1 gram of that substance by 1°C

() For water, this is 4.186Jg°C

The equation to use:

Q = m * c * ΔT

Q = 32.5 * 4.186 * 43

Q = 5849.935 J

Q = 5.850 kJ

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     I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)

- Heather

Answer:

\(\boxed {\boxed {\sf 5569.85 \ Joules}}\)

Explanation:

We are asked to find how much energy is required to heat a sample of water.

We will use the following equation:

\(q= mc \Delta T\)

The mass of the water is 32.5 grams. The specific heat capacity of water is 4.18 Joules per gram degree Celsius.

The change in temperature is the difference between the final temperature and the initial temperature. The water's temperature is raised from 34 degrees Celsius to 75 degrees Celsius.

Now we know all three variables:

Substitute the values into the formula.

\(q= (32.5 \ g)(4.18 \ J/g \textdegree C)(41 \ \textdegree C)\)

Multiply the first 2 numbers together. The units of grams cancel.

\(q= 135.85 \ \ J/ \textdegree C(41 \ \textdegree C)\)

Multiply again. This time, the units of degrees Celsius cancel.

\(q= 5569.85 \ J\)

5,569.85 Joules of energy are required.

The mass of sodium tetraoxosulphate (VI) formed when 0.5 mole of sodium hydroxide reacts with tetraoxosulphate ions is 71.0 g.

To calculate the mass of sodium tetraoxosulphate (VI) formed, we first need to write a balanced chemical equation for the reaction between sodium hydroxide (NaOH) and tetraoxosulphate (VI) ions (\(SO4^2\)-):

\(NaOH + H_{2}SO_{4} \rightarrow Na_{2}SO_{4} + 2H_{2}O\)

From the balanced equation, we can see that 1 mole of NaOH reacts with 1 mole of \(H_{2}SO_{4}\) to produce 1 mole of \(Na_{2}SO_{4}\). Therefore, the number of moles of \(Na_{2}SO_{4}\) produced can be calculated using the following formula:

moles of \(Na_{2}SO_{4}\) = moles of NaOH

Since we are given 0.5 moles of NaOH, we know that 0.5 moles of \(Na_{2}SO_{4}\) will be produced.

To calculate the mass of \(Na_{2}SO_{4}\) produced, we need to know its molar mass.

\(Na_{2}SO_{4}\) molar mass = 2(Na atomic mass) + 1(S atomic mass) + 4(O atomic mass)

\(Na_{2}SO_{4}\) molar mass = 2(23.0 g/mol) + 32.1 g/mol + 4(16.0 g/mol)

\(Na_{2}SO_{4}\) molar mass = 142.0 g/mol

Now, we can use the following formula to calculate the mass of \(Na_{2}SO_{4}\) produced:

mass = moles * molar mass

mass = 0.5 mol * 142.0 g/mol

mass = 71.0 g

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Answer:

If the atom is neutral, then the number of protons(atomic number) equals the number of electrons. If the atom is an ion and has a charge, then that changes. If the charge is negative(ex. 1-), then you add that number to the number of protons to get the number of electrons. If the charge is positive, then you subtract(ex 1+) that number from the number of protons to get the number of electrons

Explanation:

Answer:

may be mp3 player......

Answer:

mp3 player

Explanation:

Neon sign contains Neon

Flash camera contains Xenon

Helium balloon contains Helium

a.) If M is a 2 × 2 matrix with det M = −2, and we want to find det((3M)-1) and det(3M-1),

then the formula to use is:

$$\det(cM) = c^n\det(M)$$ where $n$ is the order of matrix $M$.

1. Find det((3M)-1):

$$\begin{aligned}\det((3M)^{-1})&=\dfrac{1}{\det(3M)}\\\\&=\dfrac{1}{3^2\det(M)}\\\\&=\dfrac{1}{9(-2)}\\\\&=-\dfrac{1}{18}\end{aligned}$$

Therefore, det((3M)-1) = -1/18.

2. Find det(3M-1):

$$\begin{aligned}\det(3M-1)&=3^2\det(M-1/3)\\\\&=9\det(M-1/3)\\\\&=9\left|\begin{matrix}a-1/3 & b \\ c & d-1/3\end{matrix}\right|\\\\&=9\left(ad-\dfrac{a}{3}-\dfrac{d}{3}+\dfrac{1}{9}\right)\\\\&=3(3ad-a-d+1/3)\\\\&=9\det(M)-3\det(I)\\\\&=9(-2)-3(1)\\\\&=-21\end{aligned}$$

Therefore, det(3M-1) = -21.

b.) If A is a 5 × 5 matrix and det((2A)-1) = 1/8, then:

$$\begin{aligned}\det(2A)^{-1}&=\dfrac{1}{\det(2A)}\\\\\Rightarrow\dfrac{1}{8}&=\dfrac{1}{2^5\det(A)}\\\\\Rightarrow \det(A)&=2^5(8)\\\\&=256\end{aligned}$$

Therefore, det A = 256.

c.) If A and B are 3 × 3 matrices such that $\det(A) = 150$ and $\det(B) = 3$, then:

1. det(2A) = $2^3\det(A)$ = $2^3\times150$ = 1200
2. det(A + B) $\neq\det(A) + \det(B)$ (property does not hold true for addition)
3. det(AB) = $\det(A)\det(B)$ = $150\times3$ = 450

Therefore, det(2A) = 1200, det(A + B) $\neq$ det(A) + det(B), and det(AB) = 450.

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3 methyl 2 hept-yne is the first compound. 2,3- dimethyl- 2- heptene is the second compound. 2,3,4 trimethyl octane is third compound. 2-pentyne is fourth compound.

The first substance, 3-methyl-2-heptyne, contains a triple bond between the second and third carbon atoms and a chain of seven carbon atoms. The third carbon atom is joined to the methyl group.

The second substance, 2,3-dimethyl-2-heptene, has a double bond between the second and third carbon atoms and a chain of seven carbon atoms. The second carbon atom has two methyl groups bonded to it.

Eight carbon atoms make up the chain of the third chemical, 2,3,4-trimethyl-octane, which also has three methyl groups connected to its carbon atoms 2, 3, and 4.

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Answer:

0.108

Explanation:

You use the formula Q =mco

M is mass

Q is th heat release

C is specific heat

O is the temperature change

Substitute what you have and what you get in the information in the equation then you will get your answers

Considering the definition of STP conditions and Avogadro's Number, 1.952496 L of methane will occupy 5.25×10²² molecules at STP.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

You can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of methane, then 5.25×10²² molecules are contained in how many moles of methane?

amount of moles of methane= (5.25×10²² molecules × 1 mole)÷ 6.023×10²³ molecules

amount of moles of methane= 0.087165 moles

There are 0.087165 moles of methane in 5.25×10²² molecules.

You can apply the following rule of three: if by definition of STP conditions 1 mole of methane occupies a volume of 22.4 liters, 0.087165 moles occupies how much volume?

volume= (0.087165 moles× 22.4 L)÷1 mole

volume= 1.952496 L

Finally, 1.952496 L of methane will occupy 5.25×10²² molecules at STP.

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483.07 grams

The reaction between Iron (III) oxide and carbon to produce solid iron and carbon monoxide is given as

Determine the moles of Iron(III) oxide

According to stoichiometry, 1 mole of Iron(III)oxide produced 2 moles of Iron. The moles of Iron required is expressed as:

Determine the mass of Iron produced

Hence the mass of iron that can be produced is 483.07 grams

Answer:

Boil the water and stir in potassium nitrate. If it doesn't all dissolve, you can cook it on the stove or microwave it until the water boils again. Remove the solution from heat, but let it cool slowly for the best crystal formation.

The composition of an ionic compound can be represented by its chemical formula, which shows the types and numbers of atoms in a unit of the compound.

Ionic compounds are composed of positively charged ions, called cations, and negatively charged ions, called anions.

The composition of an ionic compound can be represented by its chemical formula, which shows the types and numbers of ions in a unit of the compound.

The sum of the charges on the cations and anions must be equal and opposite in order for the compound to be electrically neutral.

For example, the chemical formula for magnesium chloride, an ionic compound, is MgCl2, which shows that it is made up of one magnesium ion (Mg2+) and two chloride ions (Cl-).

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The given statement "A hot plate is the only heat source available in the lab room to heat the hydrate in a crucible at least 2 times for 10-15 minutes at medium-high setting" is true because the water in hydrate can be removed by heating.

The crucible is the type of the laboratory glassware that is designed to melt or to burn the solid chemicals over the burner. Crucible is made from the heat resistant ceramic or the metal. The hot plates are the laboratory tools that is used for the  uniformly heat the samples. The hot plates are available with Varity of the  number of the different heating top styles.

Thus, the hot plate is the heating tool to heat the hydrate in the crucible.

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Answer:

it's 2.6 just did it the other person is wrong.

Its 2.6 the other guy is right

i did the assignment

Answer:

Example of a scientific question:

Does the angle of a ramp change the distance a toy car will travel?

Explanation: