1) 1.644 kg
Express your answer using three significant figures.

2) 74.2587 L
Express your answer using three significant figures.

3) 0.00268756 cm
Express your answer using three significant figures.

4) 8907 m
Express your answer using three significant figures.

A solution is a combination of two or more substances in which the molecules are evenly distributed throughout. A colloid is a combination of two or more substances in which the molecules are not evenly distributed.

A solution is a kind of homogeneous mixture composed of two or more substances. The term aqueous solution is termed when one of the solvents is water. In such a mixture, solute and solvent are the two components in the solution.

The mixing process of a solution happens at a macroscopic scale via the interchange of particles between the solvent and solute.

A colloid is a substance that is composed of particles that are too small to be seen with a microscope, but are large enough so that they do not pass through a semipermeable membrane. An example of a colloid is milk.        

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Answer:

• SCl6 [ Sulphur hexachloride ]

• Na2O [ Sodium oxide ]

Or:

• Na2O2 [ Sodium peroxide ]

Explanation:

→ Ionic bonding or electrovalent bonding is the type of bonding between a metal and a non metal, where a metal loses its Outermost electrons to the non metal in order to gain stability.

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7.54 *\(10^8\) meters is  75.4 nanometers.

To convert 7.54 *  \(10^8\) meters to nanometers, you can multiply the value by \(10^9\)

as,  \(10^9\)nanometers = 1  meter.

7.54 * \(10^8\) m * \(10^9\) =  7.54 x \(10^1\) nm

Therefore, 7.54 *\(10^8\) meters is equal to 75.4 nanometers.

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To convert 7.54 x 10^-8 meters to nanometers, you multiply 7.54 x 10^-8 by 1 x 10^9 to get 75.4 nanometers.

To convert meters to nanometers, you need to know that 1 meter is equivalent to 1 x 109 nanometers. Therefore, if you were to convert 7.54 x 10-8 m to nanometers, you would multiply 7.54 x 10-8 by 1 x 109.

Here's how you'd do it: 7.54 x 10-8 m * 1 x 109 nm/m = 75.4 nm. So, 7.54 x 10-8 meters is equivalent to 75.4 nanometers.

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The complete reaction, according to the law of conservation of mass is:

XX + YY → 2XY

The Law of Conservation is a fundamental principle in chemistry and physics. It states that in a closed system, mass cannot be created or destroyed during a chemical reaction or a physical change. The total mass of the substances involved before the reaction or change must equal the total mass of the substances after the reaction or change.

This principle is based on the understanding that atoms are not created or destroyed, but they can combine or separate to form different substances.

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Answer:

A wave

Explanation:

A wave is a disturbance that carries energy from one place to another. Matter is not carried with the wave but instead a wave can move through matter.

Answer:

A Wave

Explanation:

Answer:

Explanation:

wavelength λ = 12.4 x 10⁻² m .

energy of one photon = h c / λ

= 6.6 x 10⁻³⁴ x 3 x 10⁸ /  12.4 x 10⁻²

= 1.6 x 10⁻²⁴ J .

Let density of coffee be equal to density of water .

mass of coffee = 255 x 1 = 255 g

heat required to heat up coffee = mass x specific heat x rise in temp

= 255 x 4.18 x ( 62-25 )

= 39438.3 J  .

No of photons required = heat energy required / energy of one photon

= 39438.3 / 1.6 x 10⁻²⁴

= 24649 x 10²⁴

= 24.65 x 10²⁷ .

The periodic table of elements has vertical groups that tell you the number of electrons and horizontal periods that tell you the number of valance shells. The chemical elements are arranged in the periodic table according to their atomic numbers, starting with hydrogen, which has the lowest atomic number, and moving up to uranium, which has the greatest atomic number.

Due to their comparable chemical behavior, the periodic table's vertical columns are referred to as groups or families. The number of valence electrons and chemical characteristics is the same for all members of a family of elements. Periods refer to the horizontal rows on the periodic table.

The contemporary periodic table has 18 vertical columns and 7 horizontal periods.

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Answer:

2, 19, 12 and 14 are the coefficients.

In order to find the limiting reactant we will need to first set up the properly balance equation, which the question already provided us:

4 NH3 + 5 O2 -> 4 NO + 6 H2O

Now from the information in the question we have:

3.25 g of NH3

3.50 g of O2

We will need their molar mass in order to find how many moles of each compound we actually have:

O2 = 32 g/mol

NH3 = 17.03 g/mol

As we can see, in a regular reaction, we will have a 4:5 molar ratio between NH3 and O2, which means that for every 4 moles of NH3 we will need 5 moles of O2 in order to proceed in the reaction, not let's find the number of moles in NH3

17.03 g = 1 mol

3.25 g = x moles

x = 0.19 moles of NH3

Now we will use the molar ratio to find the number of moles of O2

4 NH3 = 5 O2

0.19 NH3 = x O2

x = 0.24 moles

Now we need to check if 0.24 moles of O2 is under the 3.50 grams of mass, if the mass is below 3.50, we have an excess of O2, therefore the limiting reactant will be NH3, if we have a mass above 3.50, this means that we actually have an excess of NH3, and the limiting reactant is O2

32 g = 1 mol

x grams = 0.24 moles

x = 7.68 grams, which is above 3.50, which means that the limiting reactant is O2 and we have an excess of NH3

A) Oxygen gas, O2

Now for letter B

We have to use the limiting reactant to find out how much is the mass of the product, so let's use O2, which has 3.50 g of mass and molar mass of 32 g/mol

32 g = 1 mol

3.50 g = x moles

x = 0.11 moles of O2

The molar ratio is 5:4, 5 moles of Oxygen gas for 4 moles of NO, this in a regular situation, but we have 0.11 moles of O2, for NO will be:

5 O2 = 4 NO

0.11 O2 = x NO

x = 0.09 moles of NO

Now we have to find the mass, we will use its molar mass, which is 30.01 g/mol

30.01 g = 1 mol

x grams = 0.09 moles

x = 2.7 grams of NO

b) 2.7 grams of NO

For letter C

We already know that the oxygen gas is the limiting reactant, and we have 0.11 moles of O2 in the reaction, let's find out how many grams are in excess in 3.25 g of NH3, again we are going to use molar ratio 4:5

4 NH3 = 5 O2

x NH3 = 0.11 O2

x = 0.09 moles of NH3

Using the molar mass of NH3 we will end up with

17.03 g = 1 mol

x grams = 0.09 moles

x = 1.53 grams of NH3

Now we only need to subtract this from 3.25 g

3.25 - 1.53

We have an excess of 1.72 grams of NH3

c) 1.72 grams of NH3

Answer: 7.45 g of \(Pb(NO_3)_2\) excess reagent are left over after the reaction is complete.

Explanation:

To calculate the number of moles, we use the equation:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\)

a) \({\text{Number of moles of} KI}=\frac{7.55g}{166g/mol}=0.045moles\)

b) \({\text{Number of moles of} Pb(NO_3)_2}=\frac{9.06g}{331.2g/mol}=0.027moles\)

The balanced chemical reaction is :

\(Pb(NO_3)_2(s)+2KI(s)\rightarrow 2KNO_3(s)+PbI(s)\)

According to stoichiometry :

2 moles of \(KI\) require = 1 mole of \(Pb(NO_3)_2\)

Thus 0.045 moles of \(KI\) will require=\(\frac{1}{2}\times 0.045=0.0225moles\)  of \(Pb(NO_3)_2\)

Thus \(KI\) is the limiting reagent as it limits the formation of product and \(Pb(NO_3)_2\) is the excess reagent as (0.045-0.0225) = 0.0225 moles are left

Mass of \(Pb(NO_3)_2=moles\times {\text {Molar mass}}=0.0225moles\times 331.2g/mol=7.45g\)

Thus 7.45 g of \(Pb(NO_3)_2\) of excess reagent are left over after the reaction is complete.

Explanation:

293८4639374493७47392946

Answer:

The volume of the gas at standard temperature and pressure is 378 mL.

Step-by-step Explanation:

To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas:

P1V1/T1 = P2V2/T2

where P1, V1, and T1 are the initial pressure, volume, and temperature, respectively, and P2, V2, and T2 are the final pressure, volume, and temperature, respectively.

We know that the gas has an initial pressure of 100 mmHg and an initial volume of 480 mL at a temperature of 40°C. We want to find the final volume of the gas at standard temperature and pressure, which is defined as 0°C and 1 atm (or 760 mmHg) of pressure.

First, we need to convert the initial temperature from Celsius to Kelvin by adding 273.15:

T1 = 40°C + 273.15 = 313.15 K

Next, we can plug in the values into the combined gas law equation:

(100 mmHg)(480 mL)/(313.15 K) = (760 mmHg)(V2)/(273.15 K)

We can solve for V2 by cross-multiplying and simplifying:

V2 = (100 mmHg)(480 mL)(273.15 K)/(313.15 K)(760 mmHg)

= 378 mL

Therefore, the volume of the gas at standard temperature and pressure is 378 mL.

Answer:

The ball will stop bouncing because where the starting point of the ball dropping is the most potential energy it will have. The energy decrease will cause it to bounce lower and lower by each bounce. The ball's lowered energy will cause it to stop bouncing.

1. To solve for the grams of H2 needed, we need to use the given ΔH value to calculate the amount of moles of N2 that reacted. From the balanced chemical equation, we know that for every 3 moles of H2 that reacts, 1 mole of N2 reacts. Therefore, we can use the mole ratio to convert the moles of N2 to moles of H2 and then use the molar mass of H2 to convert to grams.

First, we need to calculate the moles of N2 that reacted to produce 150.9kJ of heat:
ΔH = -92.40 kJ/mol N2
150.9 kJ = (1 mol N2 / -92.40 kJ) x (-150.9 kJ)
mol N2 = 1.63 mol

Using the mole ratio from the balanced chemical equation:

1 mol N2 : 3 mol H2

We can calculate the moles of H2 needed:3 mol H2 = 1 mol N2

3 mol H2 = 1.63 mol N2
mol H2 = 0.543 mol

Finally, we can convert moles of H2 to grams:

mol H2 = 0.543 mol
molar mass of H2 = 2.02 g/mol
grams of H2 = (0.543 mol) x (2.02 g/mol)
grams of H2 = 1.10 g

Therefore, 1.10 grams of H2 are needed to involve 150.9kJ of heat.

2. To solve for the moles of NH3 produced, we can use the same mole ratio from the balanced chemical equation:

1 mol N2 : 2 mol NH3

From the moles of N2 that reacted calculated in part 1, we can calculate the moles of NH3 produced:
1 mol N2 = 2 mol NH3
1 mol N2 = 1.63 mol N2
mol NH3 = (2 mol NH3 / 1 mol N2) x (1.63 mol N2)
mol NH3 = 3.26 mol

Therefore, 3.26 moles of NH3 were produced in the process.

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Answer:

C. The amount of natural gas consumed in the U.S. will remain constant even if the population size changes.

Answer:

First, we need to determine the molar mass of HCl.

The molar mass of HCl = the mass of hydrogen (1.008 g/mol) + the mass of chlorine (35.45 g/mol) = 36.45 g/mol.

Next, we can use Avogadro's number (6.02 x 10^23 molecules/mol) to convert the number of molecules to moles:

6.02 x 10^24 molecules / 6.02 x 10^23 molecules/mol = 10 moles

Finally, we can use the molar mass to convert moles to grams:

10 moles x 36.45 g/mol = 364.5 grams

Therefore, the mass of 6.02 x 10^24 molecules of HCl is 364.5 grams.

Answer:

Total atoms in 0.550g of =1.631x1022

Explanation:

answer is above

Answer: metal turn orange and weaker as it gets oxidised

Explanation:

Answer:

Explanation:

  1 Non-zero digits are always significant.

  2 Any zeros between two significant digits are significant.

  3 A final zero or trailing zeros in the decimal portion ONLY are significant.

Answer: using observations to spark an idea

Explanation:

Answer:

B

Explanation:

B

The correct option for the given question about Buffer Solution is Option B) which is maintains a constant or nearly constant pH when small amounts of strong acids or bases are added.

Thus we conclude that when weak acids or bases are supplied in small amounts, the pH remains steady or almost constant.

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ΔH₁ = ΔH₂ - ΔH₃

ΔH₁ = -635.1-(178.3) KJ

ΔH₁ = -813.4 KJ

Answer:

1. Solid

2. Particles.

3. Space.

Explanation:

1. The particles in a solid are packed very closely together. This is the most reason why solid particles have definite shapes of volume. This closeness is as a result of strong intermolecular forces force that exist between the particles. Hence, they can not flow but only vibrates about their mean position. Solids can not be compressed because of the strong intermolecular forces between their particles.

2. The particles of liquid are loosely together. In liquid, the particles are loosely packed and free to move about to certain degree. This is so because the intermolecular force between the particles are not as strong as those within the solid particles. Hence liquid has no definite shape but they have definite volume. They only assume the shape of the container they are poured into. Liquid can no be compressed..

3. In a gas, the space between the particles are bigger. This is so because the intermolecular forces between the particles are negligible i.e very small and so, the gas particles are free to move about and only restricted by the wall of the container they poured into. This negligible intermolecular forces are the reason why gas has no definite shapes and no volume. They can be compressed to fill a particular container.

Answer:

A) increasing dispersion interactions

Explanation:

Polarizability allows gases containing atoms or nonpolar molecules (for example,  to condense. In these gases, the most important kind of interaction produces dispersion forces, attractive forces that arise as a result of temporary dipoles induced in atoms or molecules.

Dispersion forces, which are also called London forces, usually increase with molar mass because molecules with larger molar mass tend to have more electrons, and dispersion forces increase in strength with the number of electrons. Furthermore, larger molar mass often means a bigger atom whose electron distribution is more easily disturbed because the outer electrons are less tightly held by the nuclei.

Because the noble gases are all nonpolar molecules, the only attractive intermolecular  forces present are the dispersion forces.

The boiling point of the noble gas increases on moving down the group because of the increase in the dispersion force. Thus, option A is correct.

The noble gas has been consisted of the fully complete octet of the atom and has been less reactive in nature.

On moving down the group, there has been an increase in the number of shells of the atom with the increase in the atomic mass. The bigger molecules tend to have loosely bonded outermost electrons.

In noble gases, the force acting upon the molecule has been the Dispersion force. Since, the noble gas has a complete octet, the energy for removing the electrons and changing the state increase with the increase in the molecular mass.

The only force acting on the noble gases has been the dispersion force, Thus with an increase in the dispersion force, the boiling point increases. Thus, option A is correct.

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a.The balanced reaction between \(AlCl_3\) and NaOH is:

\(AlCl_3 + 3NaOH\) → \(Al(OH)_3 + 3NaCl\) is the balanced reaction.

b.58.55g of aluminum hydroxide will form? Work must be shown to earn credit

c. 6.50 g grams of aluminum hydroxide can be formed.

d.\(Al(OH)_3\) produced from NaOH is less, NaOH will be the limiting reagent. The amount of \(Al(OH)_3\) actually produced is  4.13 g.

An equation that has an equal number of atoms of each element on both sides of the equation is called a balanced chemical equation.

a.The balanced reaction between \(AlCl_3\) and NaOH is:

\(AlCl_3 + 3NaOH\) → \(Al(OH)_3 + 3NaCl\) is the balanced reaction.

b) Given mass of \(AlCl_3\) = 100.1 g

Molar mass of \(AlCl_3\) = 133.34 g/mol

moles of \(AlCl_3\) = 100.1 g ÷133.34 = 0.7507 moles

Based on the reaction stoichiometry:

1 mole of \(AlCl_3\) produces 1 mole of \(Al(OH)_3\)

# moles of \(Al(OH)_3\) = 0.7507 moles

Molar mass \(Al(OH)_3\) = 78 g/mol

Amount of \(Al(OH)_3\) produced = 0.7507 moles x 78 = 58.55g

c) Given mass of NaOH = 57.2 g

Molar mass of NaOH= 40 g/mol

moles of NaOH = 57.2 g ÷ 40 = 1.43 moles

Based on the reaction stoichiometry:

3 moles of NaOH produces 1 mole of \(Al(OH)_3\)

moles of \(Al(OH)_3\) produced = 1.43÷ 3 = 0.4766 moles

Molar mass \(Al(OH)_3\) = 78 g/mol

Amount of \(Al(OH)_3\) produced = 0.4766 78 = 6.50 g

d) Since moles of \(Al(OH)_3\) produced from NaOH is less, NaOH will be the limiting reagent. The amount of \(Al(OH)_3\) actually produced is 6.50 g.

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The final temperature of the water is: T_final = 45.0°C

We can use the formula for the specific heat capacity of the water to solve this problem:

q = mcΔT

First, we can calculate the initial energy of the water:

q = mcΔT

q = (10.0 g) (4.184 J/g°C) (25.0°C)

q = 1,046 J

Next, we can calculate the final temperature after absorbing 840 J:

q = mcΔT

840 J = (10.0 g) (4.184 J/g°C) (ΔT)

ΔT = 20.0°C

Therefore, the final temperature of the water is:

T_final = T_initial + ΔT

T_final = 25.0°C + 20.0°C

T_final = 45.0°C

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Answer:

what are the following statements?

Explanation:

Answer:

Explanation: Calculate the wavelength and frequency of an emitted photon of gamma radiation that has energy of 2.93 × 109 J/mol

The volume of \(N_2O_5\) needed to produce 9.64 L of \(NO_2\) is 4.97 L, calculated using stoichiometry and the ideal gas equation.

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Crystals form when magma cools because the solution is super-saturated with certain minerals. Because the crystals do not have much time to form if the magma cools quickly, they are very small. The crystals have enough time to grow and become large if the magma cools slowly.

When the solution becomes supersaturated, which means there is too much salt dissolved in the water, crystals form. Crystals form from the extra salt (or other material). To obtain a supersaturated solution, either cool the solution or allow some of the water to evaporate.

The size of the crystals is affected by the solubility of the compound in the solvent used for recrystallization, the number of nucleation sites, mechanical agitation of the system, and time during crystal growth.

Thus, the crystals do not have much time to form if the magma cools quickly, they are very small.

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