What should you do if your hypothesis is incorrect ?

Answer:

the oxidation number is -3

Taking into account the definition of oxidation number, the oxidation number for N in the compound NH₃ is -3.

The oxidation number is the charge that an atom has; is an integer that represents the number of electrons an atom puts into play when it forms a given compound.

In other words, the oxidation number of an element is a value that indicates the number of electrons that element gains or loses when it combines with another.

To determine the oxidation state it is necessary to know that The oxidation number of hydrogen in a compound is +1, except in metal hydrides, where is –1.

On the other side, the sum of the oxidation numbers of the existing elements in a chemical formula must add up to zero.

Then, considering the oxidation numbers of each element, multiplying it by the number of existing elements in the chemical formula and adding it and equaling it to zero, the value of the missing oxidation number can be obtained.

In this case, the oxidation numbers of nitrogen is calculated as:

NH₃: oxidation numbers of nitrogen + 3×(+1)= 0

Solving:

oxidation numbers of nitrogen + 3= 0

oxidation numbers of nitrogen = -3

Finally, the oxidation number for N in the compound NH₃ is -3.

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Answer:

true

Explanation:

Answer:

pH at the equivalence point is 8.6

Explanation:

A titulation between a weak acid and a strong base, gives a basic pH at the equivalence point. In the equivalence point, we need to know the volume of base we added, so:

mmoles acid = mmoles of base

60 mL . 0.1935M = 0.2088 M . volume

(60 mL . 0.1935M) /0.2088 M = 55.6 mL of KOH

The neutralization is:

HBz + KOH  ⇄  KBz  +  H₂O

In the equilibrum:

HBz + OH⁻   ⇄  Bz⁻  +  H₂O

mmoles of acid are: 11.61 and mmoles of base are: 11.61

So in the equilibrium we have, 11.61 mmoles of benzoate.

[Bz⁻] = 11.61 mmoles / (volume acid + volume base)

[Bz⁻] = 11.61 mmoles / 60 mL + 55.6 mL = 0.100 M

The conjugate strong base reacts:

  Bz⁻  +  H₂O  ⇄  HBz + OH⁻    Kb

0.1 - x                       x        x

(We don't have pKb, but we can calculate it from pKa)

14 - 4.2 = 9.80 → pKb  → 10⁻⁹'⁸ = 1.58×10⁻¹⁰ → Kb

Kb = [HBz] . [OH⁻] / [Bz⁻]

Kb = x² / (0.1 - x)

As Kb is so small, we can avoid the quadratic equation

Kb =  x² / 0.1 → Kb . 0.1 = x²

√ 1.58×10⁻¹¹ = [OH⁻] = 3.98 ×10⁻⁶ M

From this value, we calculate pOH and afterwards, pH (14 - pOH)

- log [OH⁻] =  pOH → - log 3.98 ×10⁻⁶  = 5.4

pH = 8.6

An exothermic reaction Produces energy

In an endothermic reaction, the energy of the products is more than the energy of the reactants.  and  Activation energy is always greater than the potential energy of the products

An endothermic reaction is a reaction which requires an external source of energy before the reaction will take place ( i.e. endothermic reaction absorbs energy in the form of heat from its surrounding ) while an exothermic reaction releases energy in the form of heat into the environment.

Activation energy is amount of energy required to start a reaction since an endothermic reaction absorbs energy from its environment to kick off its reaction, its activation energy is always higher than the potential energy of its products.

Hence we can conclude that An exothermic reaction Produces energy In an endothermic reaction, the energy of the products is more than the energy of the reactants.   and Activation energy is always greater than the potential energy of the products.

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Answer:

An exothermic reaction

✔ produces energy

.

In an endothermic reaction, the energy of the products is

✔ more than

the energy of the reactants.

Activation energy is

✔ always greater than

the potential energy of the products.

Explanation:

2023 edge

Answer:

It shows constant motion when a straight line( not parallel) is formed in distance time graph.

Answer:

the answer is C

Explanation:

there is 1 purple and 2 blues

The  model which represents chemical formula of nitrogen dioxide is C.

Chemical formula  is a way of representing information about the proportions of elements which are present in a compound or molecule.It is generally written with the symbols of chemical elements. It also makes use of brackets and subscripts.

Number of atoms of each element is written as a subscript .Chemical formula makes use of no words . It is not the same as structural formula .Chemical formula in the simplest form is called as the empirical formula.

Drawbacks of chemical formula are that they do not provide information about the position of atoms and not also on the structure. Owing  to these reasons, chemical formula is not that informative as that of structural formula.

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Answer:

C.

Explanation:

Answer:

60 meters

Explanation:

Answer:

Empirical formula: CH₃O

Molecular formula: C₂H₆O₂

Explanation:

All carbon is converted in CO2 and all hydrogen in H2O. Thus, we can find mass of each element and, by subtracting, the mass of Oxygen:

Mass C:

10.52g CO2 * (1mol / 44g) = 0.239 moles CO2 = Moles C * (12.01g / mol) =

2.87g C

Mass H:

6.460g H2O * (1mol / 18g) = 0.359 moles H2O * 2 = 0.718 moles H * (1g / mol) =  

0.718g H

Mass O:

7.417g Sample - 2.87g C - 0.718g H =

3.829g O

Now, we can determine empirical formula defined as the simples whole number ratio of atoms present in a compound with moles of each atom:

Moles C: 0.239 moles C

Moles H: 0.718 moles H

Moles O: 3.829g * (1mol / 16g) = 0.239 moles O

The ratio of moles of each atom divided in moles of oxygen:

C: 0.239 mol / 0.239 mol = 1

H: 0.718 mol / 0.239 mol = 3

C: 0.239 mol / 0.239 mol = 1

The molar mass of CH3O is:

12.01g/mol + 1g/mol*3 + 16g/mol =

31.01g/mol

That means molecular formula is twice empirical formula because its molecular mass is 31.01g/mol * 2 = 62.02g/mol ≈ 62.07g/mol

Answer:

A. flooding

Explanation:

At high elevations air becomes thinner so a person may not be receiving enough oxygen which can cause dizziness. Flooding typically happens at sea level.

Answer:

I HOPE IT HELPED THANKS

Answer:

E = 2.05×10⁻²³ J

Explanation:

Given data:

Wavelength of transmission = 9.7 mm (9.7/1000 = 0.0097 m)

Energy of transition = ?

Solution:

9.7 mm (9.7/1000 = 0.0097 m)

9.7×10⁻³ m

Formula:

E = hc/λ

By putting values,

E = 6.63 ×10⁻³⁴ Js × 3×10⁸ m/s / 9.7×10⁻³ m

E = 19.89×10⁻²⁶ J.m / 9.7×10⁻³ m

E = 2.05×10⁻²³ J

Answer:

its 2

Explanation:

boron has 6 neutrons and oxygen has 8 neutrons on avg.

the difference is 2 neutrons

Answer:

6 oxygens on the product side

Explanation:

1) balance the equation:

C2H4 + 3O2 → 2CO2 + 2H2O

2) calculate the number of oxygens on the product side

2CO2=4

2H2O=2

According to the law of conservation of mass, there are 6  atoms of oxygen in the product of this reaction.

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

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Answer:

[BaCl₂] = 1.42M

Explanation:

Given:    Na₂SO₄(aq) + BaCl₂(aq) => 2NaCl(aq) + BaSO₄(s)

The balanced equation shows a 1:1 reaction between Na₂SO₄(aq) & BaCl₂(aq) and means the moles of sodium sulfate used equals the moles of baium chloride used. The concentration is the theoretical mole value calculated divided by 0.050 Liters.

Na₂SO₄(aq) + BaCl₂(aq) => 2NaCl(aq) + BaSO₄(s)

Moles of Na₂SO₄(aq) = moles of BaCl₂(aq) = 10.09g/142.04g/mol = 0.071mole

∴ Molar Concentration of BaCl₂(aq) = moles BaCl₂/Volume of Soln in Liters

= 0.071mole/0.050Liters = 1.42M in BaCl₂.  

Answer:

5

Explanation:

Answer:

carbon dioxide in the atmosphere

Explanation:

Carbon dioxide in the atmosphere is the major cause of greenhouse effect.

Greenhouse effect is the main cause of global warming.

Answer:

A.

Explanation:

I just know.

Answer:

a.

Explanation:

Answer:

22 electrons are in the compound CO2. And the correct answer is Phosphorus tribromide.

Explanation:

Answer:

A. star formation begins in a nebula.

Explanation:

Answer:

Carbon Dioxide

Explanation:

Plants inhale Carbon Dioxide and exhale Oxygen

Answer:

9812

Explanation:

i think

Answer:

if im correct its b but im not 100 percent sure

Explanation:

Answer:

CH2N2

Explanation:

To find the molecular formula, we must first find the empirical formula as follows:

28.57% C - 28.57g of Carbon

4.80% H - 4.80g of Hydrogen

66.64% N - 66.64g of Nitrogen

Next, we convert this mass values to mole by dividing by their respective atomic mass.

C = 28.57/12 = 2.38mol

H = 4.80/1 = 4.80mol

N = 66.64/14 = 4.76mol

Next, we divide each mole value by the smallest mole value (2.38mol)

C = 2.38mol ÷ 2.38 = 1

H = 4.80mol ÷ 2.38 = 2.01

N = 4.76mol ÷ 2.38 = 2

The empirical ratio of C, H and N is therefore 1:2:2. Hence, the empirical formula is CH2N2

To calculate the molecular formula;

(CH2N2)n = 42.04 g/mol

{12 + 1(2) + 14(2)}n = 42.04

{12 + 2 + 28}n = 42.04

{42}n = 42.04

n = 42.04/42

n = 1.00009

Since n = 1, molecular formula is CH2N2

Answer:

Average atomic mass  = 85.557 amu.

Explanation:

Given data:

Percent abundance of Rb-85 = 72.15%

Percent abundance of Rb-87 = 27.85%

Average atomic mass = ?

Solution:

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass = (72.15×85)+(27.85×87) /100

Average atomic mass =  6132.75 + 2422.95 / 100

Average atomic mass = 8555.7 / 100

Average atomic mass  = 85.557 amu.

Explanation:

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability