(Trial 1)
Convert mass to moles for both reactants. (round to 2 significant figures.)
2.50 g CuCl equals
moles
0.50 g Al equals
moles
DONE

4.63 gram of Cooper(II) chloride contain 2.17 grams of Cu²+

Molar mass of copper(II) chloride = 134.45 g/mol

Molar mass of copper = 63 grams

The average mass of an element's atoms expressed in atomic mass units is known as its atomic mass (amu, also known as daltons, D). The mass of each isotope is multiplied by its abundance to produce the atomic mass, which is a weighted average of all the isotopes of that element.

63 gram of copper is present in 134.45 g/mol of copper(II) chloride

1 gram copper is present in copper(II) chloride = 134.45/63 = 2.13 gram

2.17 gram Cu²+ in copper(II) chloride = 2.13 gram x 2.17 gram = 4.63 gram

Hence, 4.63 gram of Copper(ii) chloride contain 2.17 grams of Cu²+

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Considering the definition of STP conditions, you obtain:

A. 44 grams of N₂ will ocupy at STP 35.168 L.

B. 0.25 moles of NH₃ will ocupy at STP 5.6 L.

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.

The molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.

In this case, you have:

You can apply the following rule of three to know the number of moles of N₂: if 28 grams of the compound are contained in 1 mole, 44 grams are contained in how many moles?

number of moles of N₂= (44 grams× 1 mole)÷ 28 grams

number of moles of N₂= 1.57 moles

Now, you can apply the following rules of three to know the volume of N₂ and NH₃:

volume of N₂= (1.57 moles× 22.4 L)÷ 1 mole

volume of N₂= 35.168 L

volume of NH₃= (0.25 moles× 22.4 L)÷ 1 mole

volume of NH₃= 5.6 L

Finally, you obtain:

A. 44 grams of N₂ will ocupy at STP 35.168 L.

B. 0.25 moles of NH₃ will ocupy at STP 5.6 L.

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The number of mole of Cr in 1 mole of Cr₈(PO₄)₃ is 8.00 moles

From the formula of the compound, Cr₈(PO₄)₃, the following were obtained:

From the formula, we can see that 8 moles of Cr are present.

Thus, 1 mole of Cr₈(PO₄)₃ will contain = 1 × 8 = 8.00 moles of Cr

Therefore, we can conclude that 1 mole of Cr₈(PO₄)₃ contains 8.00 moles of Cr

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The arrows B, C, and E represent the process of cooling.

Solid state: In the solid state, the molecules are arranged in a regular and fixed pattern. The molecules in a solid are closely packed that is the solid particles can not move.

Liquid state: In the liquid state, the molecules are present in an irregular pattern. The molecules are closely packed but particles can move.

Gaseous state: In the gaseous state, the molecules are present in an irregular manner. The molecules of gases are not closely packed and can move freely.

Therefore, the solid changes to liquid on heating, and the liquid changes to solid after cooling.

Liquid changes to a gaseous state on heating while gases changes to liquid on cooling.

Solid changes to gas on heating and gases change to solid after cooling.

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The empirical formula of the carboxylic acid is C₃H₆O₂.

For determination of the empirical formula of the carboxylic acid.

As you know, one mole of water, contains 2 moles of hydrogen. This means that the percent composition of hydrogen in water will be

2× 1.00794 g/mol / 18.015 g/mol × 100 = 11.19% H

What this means is that every 100 g of water will contain  11.19 g of hydrogen. In your case, the 0.2349-g  sample of water will contain  

0.2349 g water⋅ 11.19 g H / 100 g water = 0.026285 g H

Similarly, one mole of carbon dioxide, CO₂, contains one mole of carbon. The percent composition of carbon in carbon dioxide will be

1 ×12.011 g/mol / 44.01 g/mol × 100 = 27.29% C

Once again, this tells you that every 100 g of carbon dioxide will contain

27.29 g of carbon. In your case, you will have

0.5706g H₂O ⋅ 27.29 g C /100g H₂O = 0.15572 g C

The mass of carbon + hydrogen originally present in the carboxylic acid sample will be

m C + H = 0.026285 g + 0.15572 g =0.18201 g

The initial mass of the sample was equal to 0.3200 g. This tells you that the sample also contains oxygen

m oxygen = 0.3200 g −0.18201 g = 0.13799 g O

So, now that you know how many grams of each element were present in the initial sample, use their molar masses to convert these to moles

For C: 0.15572g /12.011g/mol = 0.012965 moles C

For H:  0.026285 g/1.00794g/mol = 0.026078 moles H

For O:  0.13799g/15.9994g/ mol = 0.0086247 moles O

Now, to get the compound's empirical formula, you need to find the smallest whole number ratio that exists between the number of moles of each element in the compound.

To do that, divide these values by the smallest one to get

For C:  0.012965 moles / 0.0086247 moles = 1.5032 ≈ 1.5

For H: 0.026078moles /0.0086247 moles =3.0236≈ 3

For O:  0.0086247moles /0.0086247 moles = 1

This means that you have

C₁.₅H₃O₁

Since you're looking for the smallest whole number ratio that exists between the elements, multiply each subscript by 2 to get

C₁.₅H₃O₁ * 2 = C₃H₆O₂

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Magnesium is not a good conductor. Hence, the conductivity of magnesium is not good.

Magnesium is placed in group 2 of the periodic table. It has 2 valence electrons which are in the fully filled s-subshell. When the subshell is fully filled, the electrons are not available to move to conduct. For example, group 1 has half filled subshell which allows the electrons to move.

But, how does magnesium conduct? As its subshell is fully filled and therefore no electrons are available to move.

In group 2 metals, there is a property called s-p hybridization. The s- and p- subshells overlap so that metals can now move to the unfilled states of the p-subshell.

Hence, magnesium is not a good conductor.

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Answer:

42

Explanation:

miles per gallon = kilometers per liter × 2.35

According to postulates of the Dalton's atomic theory, atoms of same element are identical in all respects i.e., in shape, size, mass and chemical properties. However, after the discovery of isotopes, it was modified as : atoms of same element may not be similar in all respects

Forest Food web consists of the producers, main consumers, secondary consumers, scavengers, and decomposers. Food web is the collection of the large number of food chains.

Numerous food chains make up a food web. As animals seek food, a food chain only follows one way. As an example, a hawk consumes a snake following the consumption of a frog, a grasshopper, and grass. A food web illustrates the numerous relationships between plants and animals.

1. Primary consumers

2. Secondary consumers

3. Tertiary consumers

4. Decomposers or phytoremediators

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Formal charge = number of valence electron - 1/2 bonded electron - lone pair electron

a. N3 =  number of valence electron - 1/2 bonded electron - lone pair e-

    = 5 - 2/4 - 4

    = -1

b. CO = number of valence electron - 1/2 bonded electron - lone pair e-

         Charge on carbon

       =  4 - 2 - 6/2

        = -1

charge on oxygen

number of valence electron - 1/2 bonded electron - lone pair e-

= 6 - 2 - 6/2

  = +1

c. NO3

by making structure we found that each oxygen has different charge in this compound.

O = -1, -1 , 0

N = 0

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Explanation:

taking atom as hydrogen than

answer is +2.55

just apply Delta energy=energy in 4th orbit -energy in 2nd orbit

[tex]energy = - 13.6 \times z ^{2} \div n {}^{2} [/tex]

so here you can find answer

Answer:

ddddxddddddddddddddddddddddddd

An atomic mass unit is defined as 1/12 th of the mass of carbon-12 atom.

The mass of an atom is mainly due to its protons and neutrons in the nucleus.

Weight of a proton is 1.6 x 10^-27 kg

Weight of a neutron is 1.6 x 10^-27kg

However weight of an electron is 9 x 10^-31kg and hence is negligible in calculation of amu

A chlorine atom has 17 protons in its nucleus and 18 neutrons in its nucleus

Its atomic number is 17

Amu weight of Cl= weight of protons+ weight of neutrons

        =17+18

        =35amu

Hence the average atomic mass unit of chlorine atoms will be 35 amu

Disclaimer:

The value is taken for easier calculation and is not accurate upto 3 decimals

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Answer: false

Explanation: A model is a representation of a more complex system

Density of the liquid is 0.418g/mL

The liquid sample has a volume of 0.000275 L. We can convert this to mL (because we are asked to find the density in g/mL):

mass of liquid= 0.115 grams

volume of the liquid, V= 0.000275L

Density is defined as the ratio of mass per unit volume

Now we must convert the unit of volume from L to ml as liter is SI unit which goes with Kilogram

volume in ml = 0.000275 ml/l x 1000 =0.275 ml

Density d = mass/volume

                = 0.115/ 0.275

                = 0.418 g/mL

Hence the density of the liquid is 0.418 g/mL

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Answer:

Yes

Explanation:

these gains towards early childhood development are now seriously threatened

Answer:

Nebula Was Sent Into Space By Supernova

This shock wave compresses the material it passes through and is the only place where many elements such as zinc, silver, tin, gold, mercury, lead and uranium are produced. Over several months the gases cool and fade in brightness and join the debris of interstellar space.

Answer:   This shock wave compresses the material it passes through and is the only place where many elements such as zinc, silver, tin, gold, mercury, lead and uranium are produced. Over several months the gases cool and fade in brightness and join the debris of interstellar space.

Explanation:

Taking into account the reaction stoichiometry ,CuCl₂ is the limiting reagent and the theoretical yield of copper produced is 0.2363 grams.

In first place, the balanced reaction is:

2 Al + 3 CuCl₂ → 3 Cu + 2 AlCl₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 54 grams of Al reacts with 403.32 grams of CuCl₂, 0.5 grams of Al reacts with how much mass of CuCl₂?

mass of CuCl₂= (0.5 grams of Al× 403.32 grams of CuCl₂)÷ 54 grams of Al

mass of CuCl₂= 3.734 grams

But 3.734 grams of CuCl₂ are not available, 0.5 grams are available. Since you have less mass than you need to react with 0.5 grams of Al, CuCl₂ will be the limiting reagent.

The theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 403.32 grams of CuCl₂ form 190.62 grams of Cu, 0.5 grams of CuCl₂ form how much mass of Cu?

mass of Cu= (0.5 grams of CuCl₂× 190.62 grams of Cu)÷ 403.32 grams of CuCl₂

mass of Cu= 0.2363 grams

Then, the theoretical yield of copper produced is 0.2363 grams.

In summary, you obtain:

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The statement that correctly compares a hypothesis and a theory is that a hypothesis is a prediction for a specific situation, while a theory is used to make predictions for many similar situations (option B).

A hypothesis is a tentative conjecture explaining an observation, phenomenon or scientific problem that can be tested by further observation, investigation and/or experimentation.

On the other hand, a scientific theory is a coherent statement or set of ideas that explains observed facts or phenomena and correctly predicts new facts or phenomena not previously observed, or which sets out the laws and principles of something known or observed.

A theory is simply a hypothesis confirmed by observation or experiment.

Therefore, the statement that correctly compares a hypothesis and a theory is that a hypothesis is a prediction for a specific situation, while a theory is used to make predictions for many similar situations.

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Answer:

A.

Explanation:

Spiders are creepy.

That your answer.

The given chemical reaction is :

Calcium Oxide (s) + Water (l) → Calcium Hydroxide (s)

Molecular Changes : A chemical reaction is one in which the replying substances experience changes at the molecular position. This means that bonds between tittles of the reactants are broken, and tittles are changed or rearranged to produce commodity new. Chemical reaction can be reversible or unrecoverable.

What happens when frying an egg ?

Frying an egg is a chemical response. It's an illustration of an endothermic response or bone that takes in heat to make the response do. An egg is made up of proteins and water, and the thralldom also contains fat. When an egg is hotted , the proteins begin to change their structure. Protein motes are veritably complex, made up of long chains of structure blocks called amino acids. These chains are also folded and twisted to make complicated molecular structures. Hotting the egg adds energy, which causes the motes to begin to move and lose their shape. Bonds holding the shape of the protein motes together begin to break, unfolding the proteins and allowing them to spread out. New bonds are formed, and water evaporates out of the egg, changing it into a semi-solid. The egg has experienced anon-reversible chemical response, as it can not be changed back into its raw state.

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The mass of a liquid with a density of 2.5 g/mL and a volume of 15 mL  is 37.5g.

Density is the measurement of quantity or mass per unit of volume in a particular substance. Its units are  grams per centimeters cube (g/cm³) or kilograms per liter (kg/l)

⇒  g/cm³ can also be written as g/mL because 1cm³ = 1mL

Volume is a measure of space. When measuring the volume of a liquid which is sometimes referred to as capacity, the units liters (L) and milliliters (mL) are used.

Mass is defined as amount of matter present in a body. Gram (g) and kilogram (kg) are the common units.

density = mass / volume

mass = density × volume

         =  2.5 g/mL  ×  15 mL.

         =  37.5 g

Since density is given in g/mL and volume is given in mL, we can keep the unit of mass in grams (g).

Thus we can conclude that the mass of liquid is 37.5g

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Answer:

1,2,6,8,8

Explanation:

1.3511=1

2.473 =3

5.687524=6

7.555=8

8.235=8

All processes for which the temperature stays constant are described by Boyle's law.

Boyle's law is expressed as p1 * V1 = p2 * V2, where p1 and V1 are starting pressure and volume, respectively. The ultimate values of these gas parameters are p2 and V2.

Boyle's law formula can be stated in a variety of ways, depending on the parameter we want to estimate. Let's imagine we wish to determine the pressure that results from changing a gas' volume under isothermal conditions. The Boyle's law equation thus reads: p2 = p1 * V1 / V2 or p2 / p1 = V1 / V2.

As we can see, the final-to-initial pressure ratio is the opposite of the volume ratio.

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Answer:

Helper

Explanation:

is the expaltin of the explatin

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The de Broglie wavelength of the bullet traveling at 1649 miles per hour is  1.3 x 10^34 m.

The  wavelength that is associated with an object in relation to its quantum and mass is known as de Broglie wavelength.

The particles de Broglie wavelength is inversely proportional to its force.

de Broglie wavelength is expressed as : ^ = h/mv

Where ^ is wavelength, h is plank constant, m is mass and v is velocity.

1 miles = 1.60934 km

So  1649 miles = 2653.8 km

Then 2653.8 x 1000/ 60x60 = 737.2 ms -1.

The momentum  of bullet is p = mv = 0.00693kg x 737.2 ms-1

                                                          = 5.109 kg/ms

Now, de Broglie wavelength = h/p = 6.63 x 10^-34 / 5.109 kg/ms

                                                           =  1.3 x 10^34 m

Thus, de Broglie wavelength of the bullet traveling at 1649 miles per hour is  1.3 x 10^34 m.

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Answer:

A

Explanation:

A rise in temperature means that there is more thermal energy which will be used in the reaction by the sugar/sucrose, that is why solubility increases with temperature increase

Answer: The solubility of a solid increases as the temperature increases.

Explanation: THE ANSWER!! okay everbody