Please help me thanks so much....I’ll mark you?!?!:))))

Answer:

I did

Explanation:

the answer was S=d/t = 60/10 = 6m/s, I'm sorry for getting it wrong the first time I answered ^^

Answer:

Percent yield = 57.8 %

Theoretical yield  = 11.781 g

Explanation:

Given data:

Mass of CaO produced = 6.81 g

Mass of CaCO₃ react = 20.7 g

Theoretical yield = ?

Percent yield = ?

Solution:

Chemical equation:

CaCO₃       →      CaO + CO₂

Number of moles of CaCO₃ :

Number of moles = mass/molar mass

Number of moles = 20.7 g/ 100.1 g/mol

Number of moles = 0.21 mol

Now we will compare the moles of CaCO₃ with CaO.

                  CaCO₃        :           CaO

                       1              :              1

                      0.21         :           0.21

Theoretical yield of CaO:  

Mass = number of moles × molar mass

Mass = 0.21 mol × 56.1 g/mol

Mass = 11.781 g

Percent yield:

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

Percent yield = (6.81 g/ 11.781 g) × 100

Percent yield = 57.8 %

Answer:

physical

Explanation:

Answer:

40 Grams

Explanation:

Fe2O3 is 2 parts Iron 3 parts Oxygen.

Assuming the molecular weights of both are equivalent (ideal elemental law), it is a 2:3 ratio, or 2/5 of the total.

2/5 of 100 is 40, so the answer is

40 grams

Answer:

Because it devolved

Explanation:

The sugar can no longer be seen because upon solubilization;

Definition:

Solubility is characterized by the formation of new bonds between the solute molecules and solvent molecules.

In this case; the solute is sugar while the solvent is Water.

PS: The mixture formed from sugar and water is called Sugar syrup.

Read more:

https://brainly.com/question/24671587

Answer: [tex]Ne:1s^22s^22p^6[/tex]

[tex]Li:1s^22s^1[/tex]

[tex]N:1s^22s^22p^3[/tex]

[tex]S:1s^22s^22p^63s^23p^4[/tex]

[tex]Sc:1s^22s^22p^63s^23p^64s^23d^1[/tex]

Explanation:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.  The electrons are filled according to Afbau's rule in order of increasing energies.

The electronic configuration for given elements is as follows:

[tex]Ne:10:1s^22s^22p^6[/tex]

[tex]Li:3:1s^22s^1[/tex]

[tex]N:7:1s^22s^22p^3[/tex]

[tex]S:16:1s^22s^22p^63s^23p^4[/tex]

[tex]Sc:21:1s^22s^22p^63s^23p^64s^23d^1[/tex]

Answer: duh

Explanation:

Answer: First an endothermic and then followed by the exothermic process

Explanation:

Based on the information given in the question, we should note that the entire process is an endothermic process at first and then an exothermic process.

We should note that heat is absorbed during an endothermic process and the environment is cooled but for an exothermic process, heat is being released which leads to the increase in the temperature of the surroundings.

Answer:

it says the answer is variation

Answer:

They can both be used in an electric circuit.

Explanation:

Though conductors and insulators are very different from each other but still they have a similarity that "they can both be used in an electric circuit".

Conductors are the material that allows electricity to flow and insulators have high resistance and do not allow electricity to flow.

Both conductors and insulators are used in an electric circuit as conductor is used in wires, batteries and bulb to flow current while insulators are used in insulation of wire, switches, plugs and etc. Combination of them makes the circuit shock free.

Hence, the correct answer is "They can both be used in an electric circuit."

Answer:

They can both be used in an electric circuit.

Explanation:

Answer:

Oxygen

Explanation:

If two balloons are filled with hydrogen gas and helium gas respectively, then we want to identify what gas is in each balloon, we have to do so by exposing the both balloons to flame in an oxygen atmosphere.

Hydrogen combines with oxygen in the presence of a flame with quite a loud sound and the flame is sustained but when a flame is brought near helium gas in a balloon, the gas will only make a little sound when exposed to the flame and extinguish the flame.

The reason for the explosion of the gas in the hydrogen balloon is that combustion of hydrogen gas is exothermic. The heating up of surrounding air molecules leads to a sudden explosion.

However, the helium balloon makes a little sound when the balloon is ruptured releasing helium gas which extinguishes the flame.

Answer:

Use less heat in your house.

Explanation:

You have blankets in your house, huddle up for a good movie together.

Answer:

Simple ways to reduce heat loss include

Heat loss through windows can be reduced by using double glazing

Heat loss through walls can be reduced using cavity wall insulation

Heat loss through the roof can be reduced by laying loft insulation

Explanation:

Answer:

B

Explanation:

Answer:

A) The total number of molecules of reactants has to be the same as the total number of product molecules

Explanation:

In chemistry, a chemical equation consists of reactants and products. The reactants are the compounds/substances that chemically combine to give rise to the products. According to the law of conservation of mass, a chemical equation needs to be BALANCED.

A chemical equation is said to be BALANCED when the number of atoms/molecules on the reactant side is equal to that on the product side. In other words, total number of molecules of reactants has to be the same as the total number of product molecules

Answer:

[tex]13.93\ \text{g}[/tex]

Explanation:

Molecular weight of [tex]CaCO_3[/tex] = 100.0869 g/mol

Mass of [tex]CaCO_3[/tex] = 31.7 g

Moles of [tex]CaCO_3[/tex] = [tex]\dfrac{31.7}{100.0869}=0.3167\ \text{mol}[/tex]

Moles of both [tex]CaO[/tex] and [tex]CO_2[/tex] is [tex]0.3167\ \text{mol}[/tex]

Molecular weight of [tex]CO_2[/tex] = 44 g/mol

Mass of [tex]CO_2[/tex] = [tex]44\times 0.3167=13.93\ \text{g}[/tex]

The mass of carbon dioxide formed simultaneously is [tex]13.93\ \text{g}[/tex].

Answer:

44.8 L of N₂.

Explanation:

We'll begin by writing the balanced equation for the. This is illustrated below:

N₂ + 3H₂ —> 2NH₃

From the balanced equation above,

1 mole of N₂ reacted to produce 2 moles of NH₃.

Therefore, Xmol of N₂ will react to produce 4 moles of NH₃ i.e

Xmol of N₂ = (1 × 4)/2

Xmol of N₂ = 2 moles

Thus, 2 moles of N₂ reacted to produce 4 moles of NH₃.

Finally, we shall determine the volume of N₂ required for the reaction. This can be obtained as follow:

1 mole of N₂ occupies 22.4 L at STP.

Therefore, 2 moles of N₂ will occupy = (2 × 22.4) = 44.8 L

Thus, 44.8 L of N₂ is needed to produce 4 moles of NH₃.

Hey there!:

Mole ratio :

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

2 moles C₂H₆ -------------------- 7 moles O₂

3.0 moles C₂H₆ ------------------ moles O₂ ??

moles O₂ = 3.0 x 7 / 2

moles O₂ =  21 / 2

moles O₂ = 10.5 moles of O₂

Hope this helps!

Answer:

the mass of the glass is 2

Answer: Na+ (8%)

Explanation:

Answer:

The charge carriers can be electrons, as in metals, or positive and negative ions in the case of ionic (or electrolytic) conductors. In a crystalline solid, the potassium and chlorine atoms are ionically-bonded within a crystalline matrix that prevents them from easily moving.

Explanation:

Answer:

764.7 mmHg

Explanation:

Step 1: Given data

Step 2: Calculate the partial pressure of the gas collected

The total pressure of the gaseous mixture is equal to the sum of the gas collected and the water vapor.

P = pH₂O + pGas

pGas = P - pH₂O

pGas = 785.8 mmHg - 21.1 mmHg = 764.7 mmHg

Answer:

V₂ = 956.52 L

Explanation:

Given data:

Initial pressure = 4 atm

Initial volume = 550 L

Final volume = ?

Final pressure = 2.3 atm

Solution:

The given problem will be solved through the Boyle's law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

4 atm × 550 L = 2.3 atm × V₂

V₂ = 2200 atm. L/ 2.3 atm

V₂ = 956.52 L

Answer:

0.736 moles

Explanation:

mole = mass/molecular mass

mole of H2O = 13.25/18.0

mole of H2O = 0.736

Answer: 99.45 g

Explanation: we have 22.5 g of Platinum in every 1cm3 of Platinum so if we take 4.42 cm3 of Platinum we will have 4.42 × 22.5 g = 99.45 g of Platinum

Answer:

You would put the 4 quantum numbers corresponding to the electrons being described above

Explanation:

Quantum numbers refer to electrons, so I'll assume you mean the electron number that would correspond with the atomic number of the element. Quantum numbers are basically like an address for electrons, giving us information about the location of an electron from most general to most specific.

The quantum selection rules allow finding the results for the quantum numbers for each electrons are:

          1. n = 5, f l = 3 el m = 1

           The quantum number of spin. Opposite the first electrons.

         2. n = 4, l = 2, m = 0  

             Spin opposite the first electrons.

        3. n = 4, l = 1, m = 0

            Spin number opposite the first electrons.

        4. n = 3, l = 1, m = 1

            Spin all electrons have the same spin.

         5. n = 7, l = 2, m = 0

             Spin quantum number two electrons with opposite spin.

The solution of the Scrodinger's equation in three dimensions results have  three constants related, these constants are called quantum numbers.

In independent experiments, a fourth quantum number called the spin magnetic moment was found, it can have two values ​​+ ½ and - ½

The rules for valid combinations ​​of these quantum numbers are called selection rules, the spectroscope notation for each electron is.

         [tex]n l ^m[/tex]

Where n is the principal number, l the orbital and m the magnetic.

To determine the value of the spin quantum number, the Pauli exclusion principle is used, which establishes that you cannot have two fermions (electrons) in the same quantum state, this deteriorates that in a state there can only be two electrons, one with upward spin and the other spin down.

Let's find the combination of these constants for each case.

1. The 11th electron of level  5f¹⁴.

The principal quantum number n = 5

Orbital quantum number f,  l = 3

In the f orbital, a maximum of 14 electrons can be placed, since it has 7 sub-levels and according to the Pauli Exclusion principle, each one can have two electrons.

We place 1 electron in each sub-level and then we place a second electron with the opposite spin, therefore when we get to electron number 11 it has a spin opposite to that of the first 7 electrons, but there is no way to previously know its value.

we construct a table with the distribution of electrons.

Quantum number        Electrons

n = 5

          l = 0

          l = 1

          l = 2

          l = 3

                   m = -3           ½ - ½

                   m = -2           ½ - ½

                   m = -1             ½ - ½

                  m = 0              ½ - ½

                  m = 1               ½

                  m = 2              ½

                  m = 3              ½

With the help of this table the other numbers are:

Tthe magnetic quantum number is m = 1

The quantum number of spin. opposite the spin of the first electrons.

2. The eighth electron of the 4d¹⁰ state

Pricipal number n = 4

Orbital number l = 2

We construct a table with the distribution of electrons.

Quantum number        Electrons

n = 4

      l = 0

      l = 1

      l = 2

              m = -2                ½ - ½

              m = -1                 ½ - ½

              m = 0                  ½ - ½

              m = 1                  ½

              m = 2                 ½

With this table the other quantum numbers are;

Magnetic m = 0

Spin opposite the first electron

3. 5th electron of 4p⁶

Principal number n = 4

Orbital number p l = 1

We construct a table with the distribution of electrons.

 Quantum number        Electrons

   n = 4

           l = 0

           l = 1

                m = -1                    ½ - ½

                m = 0                    ½ - ½

               m = 1                       ½

Magnetic number m = 0

Spin number opposite the first electrons.

4. 15th electron of phosphorus

The electron configuration of phosphor is

        1s² 2s²2p⁶ 3s²3p³

Principal quantum number n = 3

Orbital quantum number p, l = 1

We construct the electron distribution table.

Quantum number        electrons

 n = 3

          l = 0

         l = 1

               m = -1                   ½

               m = 0                   ½

               m = 1                    ½

The other quantified numbers are:

Magnetic m = 1

Spin all electrons have the same spin.

5. The last electron of neptunium.

Electronic configuration.

 Radon Gas Configuration +  5f⁴6d¹ 7s²

Principal quantum number n = 7

Orbital quantum number l = 2

Magnetic quantum number m = 0

Spin quantum number two electrons with opposite spin.

In conclusion using the quantum selection rules can determine the quantum numbers for each given electron are:

        1. n = 5, f l = 3 el m = 1

           The quantum number of spin. Opposite the first electrons.

         2. n = 4, l = 2, m = 0  

             Spin opposite the first electrons

        3. n = 4, l = 1, m = 0

            Spin number opposite the first electrons.

        4. n = 3, l = 1, m = 1

            Spin all electrons have the same spin

         5. n = 7, l = 2, m = 0

             Spin quantum number two electrons with opposite spin.

Learn more about the quantum selection rules here:   brainly.com/question/14288557

Answer:

I don't know exactly how you want me to answer but I feel like the white bunnies population decrease because the brown bunnies have an advantage with the brown background so the wolves will hunt and kill all the white ones because they are more standing out.

Answer:

If you are thinking all the white bunnies would be gone that would not happen

Explanation:

If you put white bunnies with the withe the brown bunnies they would breed so then there would be more bunnies then there would be more bunnies and wolves.