Cu +H2O → CuO + H2
What is the balancing equation

formula for density of liquid = mass ÷ vol

= 14.0 g ÷ 18.0 cm³

= 0.77778 g/cm³ ( 5sf)

= 0.778 g/cm³ ( 3sf )

18.0 cm³ is the same as 18.0 ml

Therefore, the liquid will float on water as the water is denser than the liquid.

18.0 cm³ is equivalent to 18.0 ml, in light of the fact that water is denser than liquid, the liquid will float on it.

Density is defined as d = M/V, where M stands for mass and V for volume. The unit of density that is most frequently used is grams per cubic centimeter.

The formula for liquid density is mass divided by volume.

= 14.0 g ÷ 18.0 cm³

= 0.77778 g/cm³

= 0.778 g/cm³

The same procedure used to determine a solid's density is used to determine a liquid's density. Calculate the fluid's mass, then its volume, then divide mass by volume.

To determine the fluid's mass, weigh the fluid in the container, pour it out, weigh the empty container, and then subtract the empty container's mass from the mass of the filled container.

Therefore, in light of the fact that water is denser than liquid, the liquid will float on it.

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The number 0.00208 has three significant figures. Significant figures are the digits in a number that carry meaningful information about its precision. In the case of 0.00208, the digits 2, 0, and 8 are all significant.

Zeros that appear before the first nonzero digit (leading zeros) are not considered significant. Therefore, the leading zero in 0.00208 is not counted as a significant figure.

To summarize, the number 0.00208 has three significant figures: 2, 0, and 8.

If we write the number as 0.002080, the trailing zero after the 8 would be considered significant, indicating that there are four significant figures in the number.

If we express the number in scientific notation, such as 2.08 x 10^(-3), the digits 2, 0, and 8 remain significant, regardless of the exponent. Hence, there are still three significant figures in the number.

It's important to note that significant figures are not limited to decimal numbers. They are also relevant in whole numbers and in calculations involving measurements with uncertainties.

Understanding the concept of significant figures allows us to maintain consistency and precision in calculations and measurements. By recognizing the significant figures in a number, we can appropriately determine the number of decimal places to retain in the result of a calculation or measurement.

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According to the definition of molarity, 350 mL of a solution with a sodium ion concentration of 0.125 M requires 6.2125 g of Na2SO4 to manufacture.

The number of moles of a solute that are dissolved in a given volume is what is meant by the definition of molarity, which is a measurement of a solute's concentration.

By dividing the moles of the solute by the volume of the solution, molarity, also known as the molar concentration of a solution, is obtained.

Molarity = No. of moles of solute / Volume

Molarity is expressed in units mole/litre

In this case, you know that:

Replacing in the definition of molarity:

0.125M = No. of moles of solute / 0.350l

Solving:

number of moles of solute= 0.125 M× 0.350 L

number of moles of solute= 0.04375 moles

Being 142 g/mole the molar mass of Na₂SO₄, that is, the mass of one mole of the compound, the amount of mass that contains 0.04375 moles is calculated as:

mass= 0.04375 moles× 142 g/moles

mass= 6.2125 g

In summary, 6.2125 g of Na₂SO₄ is needed to prepare 350 mL of a solution having a sodium ion concentration of  0.125 M.

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Answer:

50000 dollars or 5 e5

Explanation:

Mr. Garibay has \(5.0 * 10^4\) dollars in his bank.

Scientific notation represents the data in the format of expanded number or with e character.

For instance, 5.0 * 10^4 dollars = 50000 dollars or 5 e5

CH3OH has the highest boiling point of the three substances, with a boiling point of 64.7°C.

What is Hydrogen bonding?

Hydrogen bonding is a type of chemical bond that occurs when a hydrogen atom is covalently bonded to a highly electronegative atom, such as oxygen or nitrogen. This type of bond is stronger than a typical covalent bond and can result in the formation of water molecules, DNA, and proteins. Hydrogen bonds are responsible for many of the properties of water and other molecules, such as their boiling points.

The highest boiling point among the three given substances is CH3OH with a boiling point of 64.7 °C. This is due to the presence of strong intermolecular hydrogen bonding forces between the molecules. The other two substances, CO and N2, do not engage in hydrogen bonding and have much lower boiling points of -191.5 °C and -195.8 °C respectively.

What are dipole-dipole forces?

Dipole-dipole forces are a type of intermolecular force that results from the electrostatic attraction between two molecules that have permanent dipole moments. This type of force occurs when the positive end of one dipole is attracted to the negative end of another dipole. Dipole-dipole forces are relatively weak compared to other intermolecular forces such as ion-dipole forces and hydrogen bonding.

What are dispersion forces?

Dispersion forces, also known as London forces, are weak intermolecular forces that occur when temporary dipoles form in molecules. These forces are usually present in non-polar molecules, and are caused by fluctuations in electron density across the molecule. Dispersion forces are the weakest of the intermolecular forces, but are still important for determining physical properties such as boiling points, vapor pressures, and solubility.

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Answer:

Objects with more mass have more gravity. Gravity also gets weaker with distance. So, the closer objects are to each other, the stronger their gravitational pull is.

Explanation:

Answer:

The force of gravity increases with mass, but decreases with increasing distance between objects.

Explanation:

Objects with more mass have more gravity. Gravity also gets weaker with distance. So, the closer objects are to each other, the stronger their gravitational pull is. Earth's gravity comes from all its mass.

The percent yield using KBr would be 80.6%, which is different from the percent yield using NaCl (88.5%).

In part 2, step 1 of the experiment, we react [Fe(phen)₃]Cl₂ with NaBr to obtain [Fe(phen)₃]Br₂ and NaCl. If we were to use an excess of KBr instead of NaCl, the reaction would proceed as follows:

[Fe(phen)₃]Cl₂ + 2KBr → [Fe(phen)₃]Br₂ + 2KCl

In this case, the product we would obtain is still [Fe(phen)₃]Br₂, but the byproduct would be KCl instead of NaCl.

Now, let's consider the theoretical yield and percent yield. The theoretical yield is the amount of product that would be obtained if the reaction proceeded perfectly, without any loss of material. The percent yield is the actual yield (the amount of product obtained in the experiment) expressed as a percentage of the theoretical yield.

Since we are assuming that we isolated the same amount of product in grams as the original experiment, the actual yield would be the same. However, the theoretical yield would be different because the molar mass of KBr is different from that of NaCl. Therefore, the amount of [Fe(phen)₃]Br₂ that would be obtained from a given amount of KBr would be different from the amount obtained from the same amount of NaCl.

To calculate the new theoretical yield and percent yield, we need to know the amount of KBr used in the experiment. Let's assume that we used 2.0 grams of KBr.

The molar mass of KBr is 119.0 g/mol, so the moles of KBr used in the experiment would be;

2.0 g KBr / 119.0 g/mol = 0.0168 mol KBr

From the balanced equation, we can see that the stoichiometry of the reaction is 1:1 between [Fe(phen)₃]Cl₂ and NaCl or KBr. Therefore, the moles of [Fe(phen)₃]Br₂ that would be obtained from 0.0168 mol of KBr would be;

0.0168 mol [Fe(phen)₃]Br₂ / 1 mol KBr = 0.0168 mol [Fe(phen)₃]Br₂

The molar mass of [Fe(phen)₃]Br₂ is 740.2 g/mol, so the theoretical yield of [Fe(phen)₃]Br₂ would be:

0.0168 mol [Fe(phen)₃]Br₂ × 740.2 g/mol = 12.4 g [Fe(phen)₃]Br₂

Therefore, the theoretical yield of [Fe(phen)₃]Br₂ using KBr would be 12.4 grams, which is different from the theoretical yield using NaCl (11.3 grams).

To calculate the new percent yield, we need to divide the actual yield (let's assume it's 10.0 grams) by the new theoretical yield (12.4 grams) and multiply by 100;

Percent yield=(actual yield/theoretical yield) × 100

Percent yield = (10.0 g / 12.4 g) × 100

Percent yield = 80.6%

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The concentration of the HBr solution is 0.125 M.

The given solution is a 53.65 ml solution of HBr that is completely titrated by 33.50 ml of a 0.200 M NaOH solution.

This implies that all of the HBr present in the solution is neutralized by NaOH, and therefore, the number of moles of HBr is equal to the number of moles of NaOH.

The balanced chemical equation for the reaction:HBr(aq) + NaOH(aq) → NaBr(aq) + H2O(l)The stoichiometric ratio of HBr to NaOH in this reaction is 1:1.

This means that one mole of HBr reacts with one mole of NaOH to form one mole of NaBr and one mole of water.

We can use the given information to determine the number of moles of NaOH that were required to neutralize the HBr. The molarity of the NaOH solution is given as 0.200 M.

This means that there are 0.200 moles of NaOH in every liter of solution.

Therefore, the number of moles of NaOH used in the titration is:moles of NaOH = molarity × volume in liters= 0.200 M × (33.50/1000) L= 0.0067 mol

Since the stoichiometric ratio of HBr to NaOH is 1:1, the number of moles of HBr that were neutralized by the NaOH is also 0.0067 mol.

This means that the concentration of the HBr solution can be calculated as follows:concentration of HBr = moles of HBr / volume of HBr solution in liters= 0.0067 mol / (53.65/1000) L= 0.125 M

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Answer:

looo

rdyxvxkxkvxkgxkgdkvx

Explanation:

lolollkvvbffffkhdhlxkgzfjzufsfjsdhayzyrzruzruzufzktzkgdjfdufskdgjgzjfgkzjgskf

The three alkenes using systematic names are:Ethene ,Propene,Butene

1. Ethene (also known as ethylene) - with the molecular formula C2H4, it has a double bond between the two carbon atoms and is commonly used in the production of plastics, fibers, and chemicals.
2. Propene (also known as propylene) - with the molecular formula C3H6, it has a double bond between the second and third carbon atoms and is used in the production of plastics, synthetic rubber, and gasoline.
3. Butene - with the molecular formula C4H8, there are four isomers of butene that differ in the placement of the double bond. The three alkenes using systematic names are:Ethene ,Propene,Butene They are named 1-butene, 2-butene, cis-2-butene, and trans-2-butene. Butenes are used in the production of plastics, synthetic rubber, and solvents.

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The final molarity is 74.03 mM.

What is molarity?
Molar concentration, also known as molarity, amount concentration, or substance concentration, is a unit used to describe the amount of a substance in a solution expressed as a percentage of its volume. The number of moles per litre, denoted by the unit symbol mol/L as well as mol/dm3 in SI units, is the most widely used unit for molarity in chemistry. One mol/L of a solution's concentration is referred to as one molar, or 1 M.

Molar mass of KBr = 119.00 g/mol
Mass of KBr = 1.76 g
Moles of KBr = 1.76 g / 119.00 g/mol = 0.0148 mol
Initial molarity of AgNO3 = 74.0 mM
Molarity of AgNO3 = 74.0 mM = 74.0 mol/L
Volume of AgNO3 = 350 mL = 0.35 L
Moles of AgNO3 = 74.0 mol/L x 0.35 L = 25.9 mol
Total moles in solution = 0.0148 mol KBr + 25.9 mol AgNO3 = 25.91 mol
Total volume of solution = 0.35 L
Final molarity of KBr = 25.91 mol KBr / 0.35 L = 74.03 mM

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Answer:

the trapping of the sun's warmth in a planet's lower atmosphere, due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet's surface.

Answer:

The warming of a planet due to trapped radiation.

Based on Fernando's observations, when he mixed HCl and NaOH together, the resulting solution contains NaCl (sodium chloride) and H2O (water).

When he tested the conductivity of this solution using a conductivity tester and observed that the light bulb turned on, it indicates that the solution conducts electricity.

From these observations, Fernando can conclude that ionic compounds, such as NaCl, can conduct electricity when dissolved in water (H2O). This is because ionic compounds dissociate into ions when they dissolve in water, and these ions are capable of carrying electric charge. In the case of NaCl, it dissociates into Na+ (sodium cations) and Cl- (chloride anions) when it dissolves in water. These ions are free to move and can conduct electricity, allowing the electrical current to flow and light up the conductivity tester.

Conductivity is a characteristic property of ionic compounds in an aqueous solution, as the presence of mobile ions enables the flow of electric current. This behavior is due to the dissociation of the ionic compound into its constituent ions in the presence of water. The ability of ionic compounds to conduct electricity in water is an important property and has various applications in fields such as chemistry, biology, and industry.

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Answer:

2.7mol

Explanation:

Concentration = amount of substance (n)/Volume

n = C × V

n = 2.7M × 1L

n = 2.7mol

Answer:

Half life = 1.83 sec

Explanation:

Given data:

Total amount of Ar-35 = 1.80 g

Amount left after 5.49 sec = 0.225 g

Half life of Ar-35 = ?

Solution:

At time zero = 1.80 g

At first half life = 1.80 g/2 = 0.9 g

At 2nd half life = 0.9 g/2 = 0.45 g

At 3rd half life = 0.45 g/2 = 0.225 g

Half life:

Half life = Time elapsed / number of half lives

Half life = 5.49 sec / 3

Half life = 1.83 sec

p+=12   n°=14  e- =10 , The species that is represented here is ;

Mg2+.

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Answer:

2.0 x 10²³ atoms Au = 65.4g

1.5 x 10²³ atoms Pb = 51.6g

7.9 x 10²¹ atoms U = 3.1g

Explanation:

We want to convert each to grams.

We can use dimensional analysis to do so.

Kindly view the attached image for work.

1.) 2.0 x 10²³ atoms Au

Needed conversions:

Math: (2.0x10²³atoms)/(6.022x10²³atoms) x 196.966g = 65.4g

2.) 1.5 x 10²³ atoms lead

Needed conversions:

Math: (1.5x10²³atoms)/(6.022x10²³atoms) x 207.2g = 51.6g

3.) 7.9 x 10²¹ atoms U

Needed conversions:

Math: (7.9x10²¹atoms)/(6.022x10²³atoms) x 238.029g = 3.1g

B

The sodium hydroxide (NaOH) solution is a basic solution, so the pH of that solution should be close to 14

then when adding hydrochloric acid (HCl) we start to neutralice the solution, meaning the pH must sift slowly to lower pH.

Assuming both solutions have similar concentration the pH shall shift form basic (above 7) to acid pH (below 7). Until now both B and D images agreed with the explanation given. To chose between them we need to remember that HCl is a very strong acid, which means that in solution will get to very acid solutions (very low pH values) which leaves only B as possible answer

Hi

In the modern periodic table, the elements are arranged in the order of their increasing atomic number. In the modern periodic table, there are seven horizontal rows called periods and eighteen vertical columns (1 to 18) called groups. The arrangement of the periods and groups results in formation of boxes.

Explanation:

If it's help pls give me Brainliest!!

Answer:

no resonance

Explanation:

Since there is only one possible lewis structure C2H2 does not have resonance. A molecule has resonance if more than one lewis structure can be drawn for that molecule. For molecules with resonance, each lewis structure individually does not accurately depict the structure of the molecule

Answer:

no im not

Explanation:

Answer:

I have 8th but I could probably help!!

Answer:

CO 3 2-

A substance formed by combining two or more elements is called a compound .

...

Explanation:

hope it helps

This is not the best way to organize a periodic table because two elements might have similar atomic mass.

Periodic table is a chart in which arrangement of chemical elements are done.

In the early periodic table elements are arranged on the basis of their atomic masses, while after sometime Moseley arranged the periodic table on the basis of atomic number as he proposed that properties of an element is justified on the basis of number if electrons.

And mass of two substances may be same so it is difficult to differentiate between them.

Hence, two elements might have similar atomic mass.

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Answer:

Pic attached of structures

Explanation:

a) Propanal       (R-CHO; Carbonyl grp structure)

b) Dimethyl ether or methoxymethane     (R-O-R)

Answer:

A) The amount in grams of Li₃N produced is 1.243 g

B) N₂, is the limiting reagent

The mass of the non-limiting reagent, Li, remaining after the reaction is completed is 1.757 g

Explanation:

The given parameters are;

The mass of Li(s) = 2.5 grams

The mass of N₂ (g) = 0.5 grams

The chemical equation for the reaction can be presented as follows;

6 Li (s) + N₂ (g) → 2 Li₃N

Therefore, 6 moles of Li reacts with 1 mole of N₂  to produce 2 moles of Li₃N

The molar mass of Li = 6.941 g/mol

The molar mass of N₂ = 28.0134 g/mol

The number of moles of a reactant or product, n is given by the relation;

n = Mass of substance/(Molar mass of the substance)

For lithium, Li, n = 2.5/6.941 = 0.3602 moles

For Nitrogen gas, N₂, n = 0.5/28.0134  = 0.01785 moles

A) Given that 1 mole of  N₂ to produces 2 moles of Li₃N

0.01785  moles of  N₂ will produces 2×0.01785 = 0.0357 moles of Li₃N

The molar mass of Li₃N = 34.83 g/mol

The mass of Li₃N = 34.83 g/mol × 0.0357 moles = 1.243 g

B) 6  moles of Li reacts with 1 mole of N₂ to produce 2 moles of Li₃N

0.3602 moles will reacts with 1/6×0.3602 = 0.06003 mole of N₂

Therefore, N₂, is the limiting reagent and we have;

0.01785  moles of  N₂ will react with 6×0.01785 = 0.1071  moles of Li

The number of of moles of Li left = 0.3602 - 0.1071 =0.2531 moles

The mass of lithium left = 0.2531 moles × 6.941 g/mol = 1.757 g

The mass of lithium remaining after the reaction is completed = 1.757 g.

Answer:

10.58km

The formula needed to calculate the amount of wire used is expressed as:

W is the weight of wire used to wind a magnet

wg is the weight of wire per km

Given the following parameters:

Substitute the given parameters into the formula to have:

Hence the length of wire used is 10.58km

If the threshold energy of the reaction 2016O(n, γ) 170 is 15.6 MeV, then the atomic mass of 170Ol can be calculated.

Given:Atomic mass of Ol (15.996415 amu)Atomic mass of neutron (1.008665 amu)M (Ol) = 15.996415 amuM (neutron) = 1.008665 amu Threshold energy of the reaction, E = 15.6 MeV The threshold energy (E) is the minimum amount of energy that an incoming neutron must have to trigger the nuclear reaction or the amount of energy that is needed to supply for the reaction to proceed.

The atomic mass of 170Ol can be calculated as follows:E = [M (n) + M (2016O) - M (170O)] x c²Where c = speed of light, M (n) = mass of neutron, M (2016O) = mass of oxygen-16M (170O) = mass of the oxygen-17, the product of the reaction.Rearranging the above equation:  M (170O) = [M (n) + M (2016O) - E/c²]Thus, M (170O) = [1.008665 + 15.994915 - (15.6 x 10⁶ eV/ (3.0 x 10⁸ m/s)²)] amuM (170O) = 16.98803 amuTherefore, the atomic mass of 170Ol is 16.98803 amu.

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Answer:

I think C option ✔️ ✔️ correct