each atom of an element has the following electron configuration.
1s22s22p63s23p64s23d104p65s24d105p5
what is the name of this element

Answer:

Energy from the question above: is converted first from gravitational potential energy, to mechanical energy, then finally to chemical energy.

Gravitational potential energy— mechanical energy— chemical energy  

Explanation:

The Lion on the clifs edge, is above the earth's surface, has its energy stored in the form of gravitational potential energy. Gravitational energy = mgh (m = mass, g = gravitational field, h = height). The lion pouncing on the deer now has mechanical energy which comprises the addition of the lion's potential energy and its kinetic energy. After consuming the deer, the energy is in chemical energy which is important to build molecules of glucose.

Answer:

B. A Brønsted-Lowry acid donates a proton and has a matching conjugate base.

Explanation:

Here's HA is bronsted acid and its conjugate base pair is A-.

Answer:

Explanation:

The actual answer is B. The equation has an acid on one side and a base on the other. The acid donates a proton. Donates means gives up the equivalent of a proton.

Answer:

Ethanol (boiling point 78°C) and methanol (boiling point 65°C) are two miscible liquids. There is only a small difference in their boiling points. These two liquids are separated from their mixture by fractional ths distillation.

When vapours of the mixture pass through the fractionating column, repeated liquefaction and vapourisation take place. Subsequently, the vapours of low boiling methanol enter the condenser from the fractionating column, condense to liquid and get collected in the round bottomed flask first. Similarly, ethanol with higher boiling point can be collected later in another round bottomed flask.

Answer:

2.68

Explanation:

Considering the definition of STP conditions, the mass of 2.15 liters of N₂ gas at STP is 2.68 grams.

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 its mass per unit quantity of substance. In other words, molar mass is the amount of mass that a substance contains in one mole.

You can apply the following rule of three: if by definition of STP conditions 22.4 L are occupied by 1 mole of N₂, 2.15 L are occupied by how many moles of N₂?

[tex]amount of moles of N_{2} =\frac{2.15 Lx1 mole}{22.4 L}[/tex]

amount of moles of N₂= 0.096 moles

In this case, the molar mass of N₂ is 28 g/mole.

Now, you can apply the following rule of three: If 1 mole of N₂ contains 28 grams, 0.096 moles of N₂ contains how much mass?

[tex]mass of N_{2} =\frac{0.096 molesx28 grams}{1 mole}[/tex]

mass of N₂= 2.68 grams

Finally, the mass of 2.15 liters of N₂ gas at STP is 2.68 grams.

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Answer:

the answer is A i learned this in class and i had the exact same question

Answer:

please where is the Gibb free energy to indicate if its exothermic or endothermic reaction but the chemical equation is homogeneous one.

Answer:

2.33g of iron (iii) chloride

50.0 mL of 5.00 M of sodium phosphate

FeCl3 + Na3PO4 > Fe(PO4) + 3NaCl

mol = conc × vol = 0.5 × 50/1000 = 0.025 mol Na3PO4

from the equation:

1 mol of Na3PO4 reacts with 1 mol FeCl3 = 3 mol of NaCl

0.025 mol = x

x = 0.0025 × 3 = 0.075 mol NaCl

mass = 0.075 g × 59 g/mol = 4.425 g NaCl

i guessed all of this so i dont know i it is correct

One mole of sodium phosphate produce 3 moles of sodium chloride. Then the given concentration of sodium sulphate gives 0.438 g NaCl.

Sodium chloride is common salt formed by the ionic bonding of sodium and chlorine. The reaction of iron chloride with sodium phosphate is written as follows:

[tex]FeCl_{3} + Na_{3}PO_{4} \rightarrow FePO_{4} + 3NaCl[/tex]

Molar mass of iron (3) chloride = 162.4. The no.of moles in 2.33 g is 2.33/162.4 = 0.014 moles.

Molar mass of sodium phosphate is 164 g. The no.of moles of 50 ml or 0.05 L of 0.500 M is 0.500×0.05 L = 0.0025 moles.

Here the limiting reactant is sodium sulphate. The mass of sodium sulphate in this reaction is 0.0025×164 g = 0.41 g. We know that molar mass of NaCl is 58.4, for three moles 58.4×3 =175.2 g.

Thus, 164 g of sodium sulphate gives 175.2 g of sodium chloride. The mass of NaCl produced by 0.41 g of sodium sulphate is calculated as follows:

mass of NaCl = (175.2 × 0.41)/164 = 0.438 g.

Therefore, the mass of NaCl produced in this reaction is 0.438 g.

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To Find :

Gas’s temperature in Celsius when it has a volume of 25 L, 203 mol, 143.5 atm .

Solution :

We know, by ideal gas equation :

[tex]PV =nRT\\\\T = \dfrac{PV}{nR}[/tex]

Here, R is universal gas constant and [tex]R = 0.082 \ L \ atm \ mol^{-1} \ K^{1}[/tex]

Putting all given values and R in above equation, we get :

[tex]T = \dfrac{PV}{nR}\\\\T = \dfrac{143.5\times 25}{203 \times 0.082}\ K\\\\T = 215.52\ K[/tex]

Hence, this is the required solution.

Explanation:

The ozone layer is a natural layer of gas in the upper atmosphere that protects humans and other living things from harmful ultraviolet (UV) radiation from the sun. ... The ozone layer filters out most of the sun's harmful UV radiation and is therefore crucial to life on Earth.

Answer:

2Na2O (s) → 4Na (s) + O2 (g)

Explanation:

According to this question sodium oxide, Na2O, decomposes to produce oxygen gas, O2, and sodium metal, Na. The following represents the chemical equation;

Na2O (s) → Na (s) + O2 (g)

However, the above chemical equation is not balanced as the number of atoms of each element on both sides are not equal e.g. there are 2 moles of Na on one side and 1 mole on the other.

To balance the equation, we make use of coefficients to ensure that the atoms of each element on the reactant side are the same as that on the product side. The balanced equation is as follows:

2Na2O (s) → 4Na (s) + O2 (g)

Explanation:

The distribution of electrons of an atom or molecule in an atomic orbital is called electronic configuration.

1. The electronic configuration of Fluorine: [He] 2s²2p⁵.

2. The electronic configuration of Neon: [He]2s²2p⁶

3. The electronic configuration of Sulfur: 1s²2s²2p⁶3s²3p⁴

4.  The electronic configuration of Calcium:[Ar] 4s²

5. The electronic configuration of Iron: [Ar] 3d⁶4s²

Hence, this is the required solution.

the answer is Cr in Cr2O7.

Explanation:

it's oxidation number is +7 in the compound

while Fe has +3 and P has +6 in their respective compounds

The oxidation state is the gained or lost electrons by an atom to create a chemical bonding. Chromium (Cr) in Cr₂O₂⁻⁷ has the highest oxidation state. Thus, option C is correct.

Oxidation is the representation of the electrons that are lost and gained by an element in a molecule or compound to establish a chemical bond. The oxidation number of free elements is always zero, and hydrogen is usually +1.

The oxidation state of P in H₂PO⁻₄ is given as,

2 (1) + P + 4(-2) = -1

P = + 5

The oxidation number of Fe in Fe₂O₃ is given as,

2Fe + 3O = 0

2Fe + 3(-2) = 0

Fe = + 3

The oxidation number of Cr in Cr₂O₂⁻⁷ is given as,

2Cr + 7O = -2

2Cr + 7(-2) = -2

Cr = + 6

Therefore, chromium (+6) in Cr₂O₂⁻⁷ has the highest oxidation state.

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Answer:

It is not equal to Avogadro constant

Explanation:

This is because Avogadro constant refer to the number of molecules or atoms of particles per mile substance and thus is equal to 6.022×10^23 per mile or unit of that substance.

Answer:

Explanation:

You'r answer should be D

Answer:

the answer is C There is simply more collisions

Answer:

A substance has a freezing point of -4 °C and a boiling point of 60 °C.

At which temperature would the substance be found in its solid state?

Explanation:

The freezing point is the equilibrium temperature at which both solid and liquid phases of a substance will coexist.

Below the freezing point of a  substance, it exists in a solid state.

Given,

the freezing point of a substance is [tex]-4^{o} C[/tex].

So, below this temperature, the substance exists in a solid state.

Among the given options,

option A that is [tex]-10^{o} C[/tex] is less than [tex]-4^{o} C[/tex].

Hence, the answer is option A.

The temperature at which the substance would be found in its solid state is -10°C.

The given parameters:

The freezing point of a substance is the equilibrium temperature at which both solid and liquid phases of a substance will coexist.

Since the freezing point of the substance is -4 °C, its solid state will be found below -4 °C.

From the given options, only -10°C is below -4 °C.

Thus, we can conclude that the temperature at which the substance would be found in its solid state is -10°C.

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Answer:

the volume decreases and the pressure increases.

Answer:

When you first set the water balloon on top of the jar, the air pressure outside the jar and the air pressure inside the jar are the same. ... So now there is less air, less stuff, in the jar

Answer:

TRUE

Explanation:

Answer:

130.76g of Zn are needed

Explanation:

Zinc, Zn, reacts with silver nitrate, AgNO3, as follows:

Zn + 2AgNO3 → Zn(NO3)2 + 2Ag

Where 1 mole of Zn reacts with 2 moles of AgNO3

For a complete reaction of 4 moles of AgNO3 are needed:

4mol AgNO3 * (1mol Zn / 2mol AgNO3) = 2mol Zn

The mass of Zn is (Molar mass: 65.38g/mol):

2mol Zn * (65.38g / mol) =

Answer:

Aluminium fluoride is an ionic compound and the formation of the compound involves ionic bonding between positively-charged aluminium ions and negatively-charged fluoride ions.

Explanation:

Aluminium fluoride is an ionic compound and the formation of the compound involves ionic bonding between positively-charged aluminium ions and negatively-charged fluoride ions.

Ionic bonds are formed between two oppositely charged ions which are held together by strong electrostatic forces of attraction.

In the formation of aluminium fluoride, aluminium being a metal gives up its electrons to form the aluminium ion. Aluminium has three valence electrons which it gives up to the aluminium ion, Al³+. Fluorine, being a non-metal forms ions by accepting electrons to form the fluoride ion, F-. Fluorine has a valency of 1, hence, each fluorine atom can only accept one electron to form fluoride ions. Therefore, three fluorine atoms are required to accept the three electrons from an aluminium atoms.

With the formation of the aluminium and fluoride ions, the ions are then held together in the compound by the strong electrostatic forces of attrcation between the charges on the ions. Thus, the compound aluminium fluoride is formed.

Answer:

The mouth begins the process of digestion by mechanically breaking food into smaller pieces.

Explanation:

Digestion is a crucial process that involves the break down of complex food molecules into simpler ones that are assimilable by the body. The process of digestion in humans, for example, is said to begin in the MOUTH where the food enters through.

The mouth via the use of teeth helps the initially break down the food particles using mechanical/physical method. This further helps the break down of the food into tiny particles before they are acted on enzymatically.

Answer:

Refractive index

Heat capacity

Density

Explanation:

Properties that are used to identify materials are called intensive properties. These intensive properties are characteristic of the material and does not depend on the amount of material present.

Thus, if i want to identify whether the three bars are made of the same metal, i can look out for the following properties;

Refractive index

Heat capacity

Density

These properties are intensive properties thus they can be used to identify an unknown substance.

Answer:

Option A.

Explanation:

Balanced equation is:

2SO₂ (g) + O₂(g)  →  2SO₃(g)

First of all, we need to determine the limiting reagent. We convert mass to moles:

544.5 g . 1 mol / 64.06g = 8.5 moles of sulfur dioxide

160 g . 1mol / 32g = 5 moles of oxygen

Ratio is 1:2. 1 mol of oxygen needs 2 moles of sulfur dioxide

5 moles of oxygen may react to (5 . 2) /1 = 10 moles of SO₂

We only have 8.5 moles of SO₂ but we need 10 moles. In conclussion limiting reagent is SO₂.

Ratio is 2:2. 2 moles of SO₂ can prdouce 2 moles of SO₃

Then 8.5 moles of SO₂  must produce 3 moles of SO₃

We convert mass to moles, to determine the theoretical yield (100 % yield reaction) → 8.5 mol . 80.06 g /mol = 680.51 g

Formula for percent yield is: (Produced yield / Theoretical yield) . 100

(382 g / 680.51g) . 100 = 56.1 %