what does it mean for electrons to be excited ​

Answer:

Wrap a magnet in plastic lunch wrap and move it through the mixture of the three solids. The iron filings will stick to the magnet. The filings can be removed by unwrapping the plastic from the magnet carefully! Mix the remaining salt and sand in water and stir.

Explanation:

Answer:

Explanation:

To find the number of moles given the number of entities we use the formula

[tex]n = \frac{N}{L} \\ [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question

N = 1.93 × 10²³ particles

We have

[tex]n = \frac{1.93 \times {10}^{23} }{6.02 \times {10}^{23 } } \\ = 0.320598006...[/tex]

We have the final answer as

Hope this helps you

No. of particles of Na₃PO₄ = 1.93×10²³

We have to find number of moles of the given compound[tex].[/tex]

Number of moles cam be found by using this formula :

[tex]\bigstar\:\boxed{\bf{\purple{n=\dfrac{N}{N_A}}}}[/tex]

We know that,

★ Calculation :

➠ n = N/[tex]\sf{N_A}[/tex]

➠ n = (1.93×10²³)/(6.022×10²³)

➠ n = 0.32 moles

★ Explore More :

Answer:

Explanation:

Well ik its not math for this but for the first one if u add

22+22+13+1 u get 58

then second one 1+22+22+2=47

1+22+22+24+1=70

1+22+22+13+1=59

U notice how that most or some are all going up to 50 except the third one

So that means its 1s22s22p24s1

The longest wavelength is required for the excited state, 1s22s22p13s1.

According to the Bohr model, an atom absorbs energy and moves from a lower energy level to a higher energy level. Also energy is emitted when an electron moves from a higher to a lower energy level.

The lowest energy state of an atom is called the ground state. The excited state is a higher energy level. The smaller the energy difference between the energy levels, the longer the wavelength required for the transition.

Hence, the longest wavelength is required for the excited state, 1s22s22p13s1.

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Explanation:

ur answer okkkkkkkkkkkkkkkkll

Answer:

Round to six significant = 1000.92

Explanation:

Given data:

Given value = 9.9100881×101

Round given value to six significant figures

Solution:

Significant figures:

All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.

Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.

Zero between the non zero digits are consider significant like 104 consist of three significant figures.

The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.

How to round the digits:

First we will look at the six digit of given values.

we will draw a line after six digit then we will look the digit after line.

It the digit after line which is 7th digit is 5 or more than 5 then one will be added to the six digit.

If it it is less than five then six digit remain same.

After this we will add zeros to the right till decimal point.

In given measurement:

9.9100881×101  = 1000.9188981

1000.9188981

Six digit is 1 and 7th is 8 thus 1 is converted into 2.

Round to six significant = 1000.92

Answer:

The total amount of heat is 250.64 kcal.

Explanation:

Given that,

Total amount of heat = 2.000 kg

Temperature of snow = -15.00°C

Temperature of water = 38.00°C

Heat of fusion of water = 1.44 kcal/mol

Specific heat of solid water = 0.488 cal/g°C

Specific heat of liquid = 1.00 cal/g°C

We need to calculate the heat required to bring temperature -15°C to 0°C snow

Using formula of heat

[tex]Q_{1}=mc_{p}\Delta T[/tex]

Put the value into the formula

[tex]Q_{1}=2000\times0.488\times(0+15)[/tex]

[tex]Q_{1}=14640\ cal[/tex]

[tex]Q_{1}=14.640\ kcal[/tex]

We need to calculate the heat required to convert 0°C snow  into 0°C water

Using formula of heat

[tex]Q_{2}=ml[/tex]

Put the value into the formula

[tex]Q_{2}=\dfrac{2000}{18}\times1.44[/tex]

[tex]Q_{2}=160\ kcal[/tex]

We need to calculate  heat required to increases temperature of water from 0°C  to 38°C

Using formula of heat

[tex]Q_{3}=mc_{p}\Delta T[/tex]

Put the value into the formula

[tex]Q_{3}=2000\times1.00\times(38-0)[/tex]

[tex]Q_{3}=76000\ cal[/tex]

[tex]Q_{3}=76\ kcal[/tex]

We need to calculate the total heat

Using all heat amount

[tex]Q=Q_{1}+Q_{2}+Q_{3}[/tex]

Put the value into the formula

[tex]Q=14.640+160+76[/tex]

[tex]Q=250.64\ kcal[/tex]

Hence, The total amount of heat is 250.64 kcal.

Answer:

37548.55

Explanation:

3.7500*10^4+9.7100*5

3.7500*10000+9.7100*5

37500+48.55

37548.55

Answer: Europe

Explanation: it’s in germany

Answer:

See explanation

Explanation:

A coin is money made from metal stuff. Common coinage metals are copper, silver, nickel etc.

One consideration in coin production is the density of the coin. A coin of less density will have lesser mass and occupy a lesser volume. This makes it easier to carry the coin around.

Coins should therefore be made of low density metals so that they can easily be carried about.

The Rutherford experiment rose above Thompson's Model 1911 with his gold-foil experiment. He designed an experiment to use the alpha particles created by a radioactive element as probes. Hope this helps you.

Answer:

C

Explanation:

The same types of atoms

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The correct option is option C.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus of an atom, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The two samples of the element mercury (Hg) will have same type of atoms.

Therefore, the correct option is option C.

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Answer:

it is nanometers the third one

Explanation:

hope this helps

The correct answer is:

(D) Micrometers

Hope this helps!

Answer:

yes.... reared for getting wool.

Answer:

2Br(aq)+2HNO2(aq)+2H(aq)------->Br2(l)+2NO(aq)+2H2O(l)

Explanation:

The given redox reaction can be balanced in acidic medium as follows:

[tex]\rm 2 Br^{-} + HNO_{2} + H^{+} \rightarrow Br_{2} +NO + H_{2}O[/tex]

A reaction involving both oxidation and reduction is called redox reaction. One species is getting oxidized here whereas another species reduces. The substance which is oxidized  is called oxidant and the reduced species is called reductant.

In the given reaction of bromine gas with nitrous acid, bromine oxidizes from -1 to zero whereas nitrogen reduces from +3 to +2. The reaction can be occurred in acidic medium.

The redox reaction written in acidic medium involves H+ and water properly added to either sides. The balanced redox reaction of the given one in the acidic medium is thus as written above.

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Answer:

Tin(IV) Oxide + Dihydrogen = Tin + Water

Explanation:

wasn't ez

Answer:

Explanation:

The charge on the ion is 24 protons - 22 electrons = 2+

The element is Chromium (number 24 on the periodic table).

Cr^2+

Answer:

4.5 g/cm^3

Explanation:

use formula d=m/v

45/10

d= 4.5 g/cm^3

Explanation:

Number of molecules: 4.30×10²⁵

We need to find out the total number of moles.

Now, as per Avogadro's law, 6.02×10²³ of anything (Avogadro's number) constitutes a unit called one mole. Just like 12 is a dozen, 6.02×10²³ is a mole.

If you were given 24 bananas and you had to find out the number of dozens, you would divide the total number of bananas (24) by the number of bananas in one dozen (12).

We do exactly the same here: divide the total number of molecules (4.30×10²⁵) by the number of molecules in one mole (6.02×10²³) to get the number of moles.

4.30×10²⁵ / 6.02×10²³ = number of moles

Solving, we get number of NH3 moles = 71.4 which is your final answer!

Hope this helps :D

Fe is the pure element (Iron) while Fe2+ is an isotope of Fe.

Answer:

slope of line a: y=2x-2

slope of line b: y=2x+2

slope of line c: y=1x+2

Explanation:

hope this helps!!

Answer:

a)  Fe₂S₃(s) + 6H⁺(aq) ---> 6HBr(g) + Fe³⁺

b) Net ionic equation: Cu²⁺(aq) + CO₃²⁻(aq) ---> CuCO₃(s)

c) No reaction

d) Net ionic equation: Bi(OH)₃(s) + 3H⁺(aq) ---> Bi³⁺(aq) + 3H₂O

Explanation:

a) This is a double displacement reaction between solid iron(iii) sulphide and hydrobromic acid to produce hydrogen sulphide gas. The full and net equations of the reaction are given below:

Fe₂S₃(s) + 6HBr(aq) ---> 2FeBr₃ + 3H₂S(g)

Net ionic equation:  Fe₂S₃(s) + 6H⁺(aq) ---> 6HBr(g) + Fe³⁺

b) This is a double displacement reaction between potassium carbonate and copper (ii) nitrate to produce insoluble copper (ii) carbonate. The full and net equations of the reaction are given below:

K₂CO₃(aq) + Cu(NO₃)₂(aq) ---> KNO₃(aq) + CuCO₃(s)

Net ionic equation: Cu²⁺(aq) + CO₃²⁻(aq) ---> CuCO₃(s)

c) No reaction as no precipitate is formed

d) This is a neutralization reaction between bismuth (iii) hydroxide and trioxonitrate (v) acid to produce sat and water. The full and net equations of the reaction are given below:

Bi(OH)₃(s) + 3HNO₃(aq) ---> Bi(NO₃)₃(aq) + 3H₂O(l)

Net ionic equation: Bi(OH)₃(s) + 3H⁺(aq) ---> Bi³⁺(aq) + 3H₂O

Answer:

-1, -2

Explanation:

West is left south is down east is right

Answer:

4.69 liters

Explanation:

I hope this helps.