If there are 5 protons, how many electrons does the atom have?

Number of atoms : 1.26 x 10²³

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

0.21 moles of Al, so n = 0.21

Number of atoms :

[tex]\tt N=0.21\times 6.02\times 10^{23}\\\\N=1.26\times 10^{23}[/tex]

Qc < Kc, the reaction proceeds from left to right to reach equilibrium

Given

K = 50.2 at 445°C

[H2] = [I2] = [HI] = 1.75 × 10⁻³ M At 445ºC

Reaction

H2(g) + I2(g) ⇔2HI(g)

Required

Qc

Solution

Qc for the reaction

[tex]\tt Qc=\dfrac{[HI]^2}{[I_2][H_2]}\\\\Qc=\dfrac{(1.75.10^{-3})^2}{1.75.10^{-3}\times 1.75\.10^{-3}}=1[/tex]  

Qc < Kc ⇒ reaction from left(reactants) to right (products) (the reaction will shift on the right) until it reaches equilibrium (Qc = Kc)  

Answer:

Na2O + CO2 >> Na2CO3

Explanation:

Balanced. Single displacement, I think. SYNTHESIS

I think this is Right im not an expert so

Explanation:

Uses of hydrogen :

Hope it Helps.

                                                         Answer

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According to Toppr, [tex]2\cdot2=4g[/tex] of hydrogen reacts with  [tex]1\cdot32=32g[/tex] of oxygen to form [tex]2\cdot18=36g[/tex] of water. Hence, [tex]44=1g[/tex] of hydrogen reacts with [tex]432=8g[/tex] of oxygen to form [tex]436 = 9g[/tex] of water. [tex]9[/tex] grams of water can be produced when [tex]8[/tex]g of hydrogen reacts with

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Hope this helps! <3

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Answer:

Mass of zinc react with oxygen = 156.91 g

Explanation:

Given data:

Volume of oxygen = 18.9 L

Temperature = 15°C

Pressure = 1.50 atm

Mass of zinc react with oxygen = ?

Solution:

Chemical equation:

2Zn + O₂     →       2ZnO

Number of moles of oxygen:

PV = nRT

1.50atm ×18.9 L = n× 0.0821 atm.L / mol.K × 288 K

28.35 atm.L =  n× 23.64atm.L / mol

n = 28.35 atm.L  / 23.64atm.L / mol

n = 1.2 mol

Now we will compare the moles of oxygen and Zn.

             O₂          :           Zn

               1            :            2

              1.2          :        2/1×1.2 = 2.4 mol

Mass of zinc required:

Mass = number of moles × molar mass

Mass = 2.4 mol × 65.38 g/mol

Mass = 156.91 g

A. Zn²⁺

Given

Cations of several elements

Required

The least to be reduced

Solution

If we look at the voltaic series:

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe²⁺-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Fe³⁺-Ag-Pt-Au

The electrode which is easier to reduce than the hydrogen (H2) electrode has a positive sign (E red= +) and is located to the right of the voltaic series (right of H)

The electrode which is easier to oxidize than the hydrogen (H2) electrode and is difficult to experience reduction has a negative sign (E red= -) and is located to the left of the voltaic series (left of H)

Or you can look at the standard reduction potential value of the metals in the answer options, and the most negative reduction E° value which will be difficult to reduce.

The Zn metal is located far left of the other metals in the answer choices, so it is the most difficult to reduce

Answer:

6. In order from left to right the balanced coeficcients are,

6, 1, 2, 3

8. [tex]C_{7}H_{10}_{(l)}+6H_{(g)}=C_{7}H_{16}_{(l)[/tex]

9.  In order from left to right the balanced coeficcients are,

1, 11, 7, 8

Mass of Helium = 4

Helium = 55 liters

How many moles = ?

By the equation(AT S.T.P) of,

Moles = [tex]\frac{Given\ Volume}{22.4\ dm^3}[/tex]

Substitute the values,

Moles = [tex]\frac{55}{22.4}[/tex]

Simplify the fraction,

Moles = 2.5 grams/moles

Answer:

FeCl₃ is present in excess.

Explanation:

Given data:

Number of moles of FeCl₃ = 6 mol

Number of moles of oxygen = 3 mol

Excess reactant = ?

Solution:

Chemical equation:

4FeCl₃ + 3O₂      →    2Fe₂O₃ + 6Cl₂

Now we will compare the moles of reactant with product.

               FeCl₃         :          Fe₂O₃

                  4             :              2

                  6             :            2/4×6= 3

              FeCl₃         :              Cl₂

                  4             :               6

                  6             :            6/4×6= 9

                  O₂           :          Fe₂O₃

                  3             :              2

                  O₂          :              Cl₂

                   3             :               6

Less number of moles of product are formed by the oxygen thus it will act as limiting reactant while FeCl₃ is present in excess.

Answer: C. q < 0

Explanation: sorry if I'm wrong

Answer:

67.0 g Lead (ll) Nitrate

Explanation:

first, find you mass for each element

Pb= 207 g

N=14 g

207(2)+14=428 g

now convert to grams using the standard moles conversion

0.270 moles (248 g/1 mole) = 66.96

round to the correct number of significant figures, 3.

66.96= 67.0 g

Answer:

0.03697 mol Al₂(SO₄)₃

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

12.65 g Al₂(SO₄)₃

Step 2: Identify Conversions

Molar Mass of Al - 26.98 g/mol

Molar Mass of S - 32.07 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of Al₂(SO₄)₃ - 2(26.98) + 3(32.07) + 12(16.00) = 342.17 g/mol

Step 3: Convert

[tex]12.65 \ g \ Al_2(SO_4)_3(\frac{1 \ mol \ Al_2(SO_4)_3}{342.17 \ g \ Al_2(SO_4)_3} )[/tex] = 0.03697 mol Al₂(SO₄)₃

Step 4: Check

We are given 4 sig figs. Follow sig fig rules and round.

We already have 4 sig figs in the final answer, so no need to round.

Answer:

So the number of protons equals the number of electrons.

Explanation:

Ionic bond, also called an electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.

Answer:

It’s one of the most popular mobile networks across the UK, but it seems that O2 is having issues this morning

explanation:

According to Down Detector, the issues started at around 10:41 BST, and are affecting users across the UK.

Of those who reported issues, 74% said they were having problems with their mobile phone, 13% with the network, and 11% with mobile internet.

Speaking to Mirror Online, an O2 spokesperson said: "The earlier issue we experienced where some customers may have had difficulty using mobile data has now been resolved. Our technical teams are continuing to closely monitor the situation. We apologise for any inconvenience."

Answer:

W has the most potential energy

Answer:

F

Explanation:

Answer:

This type of reaction almost always produces a gas. The following are examples of decomposition reactions: Heating mercury (II) oxide produces oxygen gas: 2HgO (s) → 2Hg (l) + O2 (g). Leaving the cap off the carbonated soft drink bottle allows the carbonic acid to release carbon dioxide: H2CO3 (aq) → H2O (l) + CO2 (g). Hope this helps :)

Answer:

H2CO3

the product is H2CO3 because it is on the right side of the arrow where as the others are on the left side of the arrow (making them reactants)

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\[/tex]

From the question we have

[tex]volume = \frac{200}{0.88} \\ = 227.2727...[/tex]

We have the final answer as

Hope this helps you

Answer:

False

Explanation:

They are not the same color since they do not all have the same temperature

Temperature defines their color

Answer:

(d) All of the above

Explanation:

Acidic:-

Glutamic Acid

Basic:-

Lysine

Polar:-

Histidine

NonPolar:-

Leucine

The side chain of amino acids may contain

d) all of the above

Amino acids are the building blocks of proteins.

Amino acids are the building blocks of proteins and play an important role in body functions. They are needed for vital processes like cell building and synthesis of hormones and neurotransmitters (brain chemicals). They may also be taken as supplements.

They contain acidic and basic groups, polar and non-polar groups as well.

Examples are Alanine, Arginine, Asparagine, etc.

Find more information about Amino acid here:

brainly.com/question/1302816

Answer:

Producersssssssssss

Answer: C.  

Explanation: These offspring inherited a DNA sequence coding for white flowers from each parent plant.

:)

Answer:

Aluminum Metal

Explanation:

A P E X states that it is Aluminum Metal 100% right

Answer

a ecuación química para la reacción es: Bicarbonato sódico + vinagre = Acetato de sodio + agua + dióxido de carbono NaHCO3 + CH3COOH => CH3COO-Na+ + H2O + CO2 De la anterior fórmula, puede calcularse que una cucharadita de vinagre produce aproximadamente 1'5 gr de CO2

Answer:

It is the "Bhor's Model"

Explanation:

Nearly two-thirds of the students ranked the electron cloud and Bohr-model as their two most preferred representations. Students invoked ideas from classical mechanics to interpret the electron cloud model and used probabilistic language to describe the Bohr model of the atom.

Answer:

explain futher pls

Explanation:

Answer:

alright that sounds like a recipe i gota try

Answer:

cool!!!

Explanation:

Answer:

a) A satellite is warmed by sunlight.

Explanation:

Heat transfer by radiation mostly involves heat gain or heat loss from the Sun. In this case, Option A is the only option where sunlight is involved so it is the best example of heat transfer by radiation.