What is the correct formula for copper(ii) oxide

Answer:

[tex]2.82x10^{23}molecules[/tex]

Explanation:

Hello.

In this case, given the volume (1cm³=1mL) and density of the bromine we are to firstly compute the mass since it will allow us to compute the representative particles:

[tex]\rho =\frac{m}{V}[/tex]

[tex]m=\rho *V=3.12g/cm^3*24.0cm^3\\\\m=74.88gBr_2[/tex]

Next, since the mass of one mole of diatomic bromine is 159.82 g (one bromine weights 78.91), we can next compute the moles in that sample:

[tex]n=74.88g*\frac{1mol}{159.82g} =0.469molBr_2[/tex]

Finally, via the Avogadro's number we can compute the representative particles of bromine as follows:

[tex]particles=0.469mol*\frac{6.022x10^{23}molecules}{1mol}\\ \\2.82x10^{23}molecules[/tex]

Best regards.

The properly balanced chemical equation for this chemical reaction is written as follows:

                   [tex]FeCl_{3}(aq)+3Na0H(aq) \rightleftharpoons Fe(OH)_3(s)+3NaCl(aq)[/tex]

A chemical reaction can be defined as a chemical process that involves the continuous transformation (rearrangement) of the ionic, atomic or molecular structure of a chemical element by breaking down and forming chemical bonds, in order to produce a new chemical compound while new bonds are formed.

The chemical reaction of aqueous ferric hydroxide that is dissolved in aqueous sodium hydroxide produces ferric hydroxide and aqueous sodium chloride. Thus, the properly balanced chemical equation for this chemical reaction is written as follows:

                   [tex]FeCl_{3}(aq)+3Na0H(aq) \rightleftharpoons Fe(OH)_3(s)+3NaCl(aq)[/tex]

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Answer:

you gotta rotate it 90 degrees and get that screen fixed

Explanation:

Answer:

Please show a file so I can answer your question or tell me which experiment.

Explanation:

Definition:The control group (sometimes called a comparison group) is used in an experiment as a way to ensure that your experiment actually works. It's a way to make sure that the treatment you are giving is causing the experimental results, and not something outside the experiment.

Answer:

522

Explanation:

9 time 8 is 72, 7 carryover on 5 and 9 times 5 is 45 plus 7 carry over which is equal to 52. Therefore answer becomes 522.

(i) The volume of  1.00 M HCl neutralized by two of these ingestion tablets is 20.6 mL

(ii) The mass of salt formed in the neutralization reaction is 0.98 g

(iii) The number of magnesium ions present in that amount of salt is 6.19 × 10²¹ ions

(i) From the question, we are to calculate the volume of 1.00 M HCl neutralized two of the ingestion tablets

From the given balanced chemical equation

Mg(OH)₂(aq) + 2HCl(aq) ⟶ MgCl₂(aq) + 2H₂O(l)

This means,

1 mole of Mg(OH)₂ is neutralized by 2 moles of HCl to give 1 mole of MgCl₂

Now, we will determine the number of moles of Mg(OH)₂ present in two of the ingestion tablets

From the given information

Mass of Mg(OH)₂ in 1 ingestion tablet = 0.30 g

∴ Mass of Mg(OH)₂ in 2 ingestion tablets = 0.60 g

Using the formula,

[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]

Molar mass of Mg(OH)₂ = 58.33 g/mol

Then,

Number of moles of Mg(OH)₂ in 2 ingestion tablets = [tex]\frac{0.60}{58.33}[/tex]

Number of moles of Mg(OH)₂ in 2 ingestion tablets = 0.0102863 mole

Now,

If 1 mole of Mg(OH)₂ is neutralized by 2 moles of HCl

Then,

0.0102863 mole of Mg(OH)₂ will be neutralized by 0.0205726 moles of HCl

∴ The number of moles of HCl that would neutralize 2 ingestion tablets is 0.0205726 mole

Now, for the volume of 1.00 M HCl neutralized by two ingestion tablets

Using the formula,

[tex]Volume = \frac{Number\ of\ moles}{Concentration}[/tex]

Volume = [tex]\frac{0.0205726}{1.00}[/tex]

Volume = 0.0205726 L

Volume = 20.5726 mL

Volume ≅ 20.6 mL

Hence, the volume of  1.00 M HCl neutralized by two of these ingestion tablets is 20.6 mL

(ii) For the mass of salt (MgCl₂) formed in the neutralization reaction

Since 1 mole of Mg(OH)₂ is neutralized by 2 moles of HCl to give 1 mole of MgCl₂

Then,

0.0102863 mole of Mg(OH)₂ will be neutralized by 0.0205726 moles of HCl  to give 0.0102863  mole of MgCl₂

∴ The number of moles of the salt (MgCl₂) formed is 0.0102863 mole

For the mass of the salt formed,

Using the formula,

Mass = Number of moles × Molar mass

Molar mass of MgCl₂ = 95.211 g/mol

∴ Mass = 0.0102863 × 95.211

Mass = 0.9793689 g

Mass ≅ 0.98 g

Hence, the mass of salt formed in the neutralization reaction is 0.98 g

(iii) For the number of magnesium ions present in that amount of salt,

1 mole of MgCl₂ contains 1 mole of magnesium ions

Then,

0.0102863 mole of MgCl₂ will contain 0.0102863 mole of magnesium ions

From the formula,

Number of ions = Number of moles × Avogadro's constant

Avogadro's constant = 6.022 × 10²³ mol⁻¹

∴ Number of magnesium ions present = 0.0102863 × 6.022 × 10²³

Number of magnesium ions present = 0.061944 × 10²³

Number of magnesium ions present = 6.1944 × 10²¹

Number of magnesium ions present ≅ 6.19 × 10²¹ ions

Hence, the number of magnesium ions present in that amount of salt is 6.19 × 10²¹ ions

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Answer:

a) equivalence point

b) direct titration

c) primary standard

d) titrand

e) Back titration

f) back titration

g) standard solution

h) standard solution

I) indirect titration

j) end point

Explanation:

A volumetric analysis is one in which a solution of unknown concentration is determined from its volume. This is commonly referred to as titration.

In titration, a standard solution is reacted with another solution of unknown concentration. The point at which the concentration of the standard solution is equal to that of the analyte is known as the equivalence point (usually indicated by a colour change). An indicator may be added to the analyte solution to help identify when the reaction is complete.

The statement that are true about dilution are:

Dilution of a solution is the process by which more solvent that makes up a solution is added to the solution to decrease it's concentration.

The properties of a solution that is diluted include the following:

In dilution, the amount of solute does not change, the number of moles are the same before and after dilution.

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Based on the effect of temperature on reaction rate, to make the strongest possible solution of ammonia, it is best to use hot water.

The rate of a chemical reaction is increases with increase in temperature.

This increase in rate of reaction is observed because the number of particles with energy greater than or equal to the activation energy increases.

Therefore, to make the strongest possible solution of ammonia, it is best to use hot water.

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Explanation:

the formula of combined gas law = PV/T

:• PV/T = K

K is constant

The convergence of two oceanic plates can give rise to deep sea trenches, island arcs, and tall folded mountains, each of which is a distinctive geological feature resulting from the complex interplay of subduction, volcanic activity, and crustal compression. options A,C and D are correct.

When two oceanic plates converge, several geological features can develop as a result of the collision. One common feature is the formation of deep sea trenches. As the denser oceanic plate subducts beneath the other plate, it creates a deep trench in the ocean floor. The subduction process leads to the downward bending of the oceanic plate, forming a trench that can extend for hundreds or thousands of kilometers.

Another feature that can develop is the formation of island arcs. As the subducting oceanic plate sinks into the mantle, it releases water and volatiles, which cause the overlying mantle to melt. This molten material rises through the Earth's crust, creating a chain of volcanic islands known as an island arc. These islands are often characterized by active volcanism and can be seen in regions such as the Pacific Ring of Fire.

Additionally, the convergence of two oceanic plates can result in the formation of tall folded mountains. As the leading edge of one plate is compressed and pushed upwards, it forms a range of folded mountains. The collision and compression forces can cause the sedimentary layers to buckle and fold, leading to the creation of prominent mountain ranges. options A,C and D are correct.

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Answer:

1) Filter the mixture, Sand will remain on the filter paper. 2) Then pour the mixture of mustard oil and in separating funnel. Water will settle down at bottom and mustard oil will float on it. Then open the stopcock of the separating funnel and pour out the lower layer of water.

Explanation:

Answer:

0.714 in scientific notation is 7.14 × 10-1.

Answer: m × 10n, where m is a number between 1 and 10 ( 1 ≤ |m| < 10 ) and the exponent n is a positive or negative integer.

Explanation:

1) Move the decimal 1 times to right in the number so that the resulting number, m = 7.14, is greater than or equal to 1 but less than 10

2) Since we moved the decimal to the right the exponent n is negative

n = -1

3) Write in the scientific notation form m × 10n

= 7.14 × 10-1

Therefore,

7.14 × 10-1 is the scientific notation form of 0.714 number and 7.14e-1 is the scientific e-notation form for 0.714

Answer:

The list is limited to 20 most important contributors or, if less, a number sufficient to account for 90% of the provenance. The listed Reaction acts as a link to the relevant references for the measurement. The Measured Quantity is normaly given in the original units; in cases where we have reinterpreted the original measurement, the listed value may differ from that given by the authors. The quoted uncertainty is the a priori uncertainty used as input when constructing the initial Thermochemical Network, and corresponds either to the value proposed by the original authors or to our estimate; if an additional multiplier is given in parentheses immediately after the prior uncertainty, it corresponds to the factor by which the prior uncertainty needed to be multiplied during the ATcT analysis in order to make that particular measurement consistent with the prevailing knowledge contained in the Thermochemical Network.

Explanation:

Answer:

2835J

Explanation:

Q = mcΔT

Given,

Q = 45 × 4.2 × 15

Q = 2835 J

According to the given balanced equation:

We want to calculate the mass of products when certain amounts of reactants react. This is a stoichiometry problem.

Stoichiometry refers to the relationship between the quantities of reactants and products before, during, and following chemical reactions.

Let's consider the following balanced equation.

2 Al(s) + Fe₂O₃(s) → Al₂O₃(s) + 2 Fe(l)

a) Calculate the mass of Al₂O₃ formed when 4.1 g of Al completely reacts.

The mass ratio of Al to Al₂O₃ is 53.96:101.96.

4.1 g Al × 101.96 g Al₂O₃/53.96 g Al = 7.7 g Al₂O₃

b) Calculate the mass of Fe formed when 4.1 g Al completely reacts.

The mass ratio of Al to Fe is 53.96:111.70.

4.1 g Al × 111.70 g Fe/53.96 g Al = 8.5 g Fe

c) Calculate the mass of Fe formed when 4.1 g Fe₂O₃ completely reacts.

The mass ratio of Fe₂O₃ to Fe is 159.69:111.70.

4.1 g Fe₂O₃ × 111.70 g Fe/159.69 g Fe₂O₃ = 2.9 g Fe

According to the given balanced equation:

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Answer:

.75 meter north

Explanation:

v = d/t

v = 15/20

v = .75

Answer:

ill try

Explanation:

Answer:

C. 12.5 m/s

Explanation:

h = h(0) - gt²/2

0 m = 8 m - 9.8 m/s²*t²/2

- 8 m = - 9.8 m/s²*t²/2

16 m = 9.8 m/s² * t²

t² = 16/9.8 s²

t = √(16/9.8) s

v = v(0) + gt

v = 0 +gt

v = 9.8 m/s² * √(16/9.8) s ≈ 12.5 m/s

Given what we know, we can confirm that the one property listed that is universal for all of the electromagnetic waves listed is that they all move at the same speed in a vacuum.

These are a specific type of wave. These waves are the result of interactions between an electric field and a magnetic field. These waves have many properties and can be of many distinct types, however, one universal property of these waves is that all of them will move at the same speed whilst in a vacuum.

Therefore, we can confirm that the one property listed that is universal for all of the electromagnetic waves listed is that they all move at the same speed in a vacuum.

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Answer:

2.33 g H20

Explanation:

12.1 grams of water are produced when 5.38g of O₂ is reacted.

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Given,

Mass of oxygen = 5.38g

Moles = mass / molar mass

Moles of oxygen = 5.38 / 16

                             = 0.34 moles

From the reaction,                      2H₂ + O₂ = 2 H₂O

1 mole of oxygen gives 2 moles of water.

Thus, 0.34 moles of oxygen will give 2 × 0.34 moles

                                                 = 0.67 moles of water.

Mass of water = moles × molar mass

                    = 0.67 × 18

                    = 12.1 g of water

Therefore, 12.1 grams of water are produced when 5.38g of O₂ is reacted.

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Answer:

Explanation:

All forms of energy that may move in waves, including as light, x-rays, radio signals, heat, and microwaves, are included in the electromagnetic spectrum. These waves all have an abundance of energy in them. Additionally, they can all fly through outer space.

Light energy is a type of electromagnetic energy, while heat energy is a type of kinetic energy made up of the random motion of a material's particles. This is the main distinction among light energy and heat energy. Despite the fact that light and heat are both forms of energy, both are not the same. All forms of energy that may move in waves, including as light, heat, x-rays, radio signals, ultraviolet waves, and microwaves, are included in the electromagnetic spectrum. These waves all have an abundance of energy in them. Additionally, they can all fly through outer space.

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bro is that genius cast that's an easy line

I can easily draw that

Answer:

Salts of Weak Acids and Strong Bases are slightly basic with a pH of greater than 7 . For Example: NaOH (Sodium Hydroxide) , a strong base , when reacted with a weak acid , H 2 CO 3 (Carbonic acid) , gives a basic salt Na 2 CO 3 (Sodium Carbonate) which has a pH of higher than 7.

hope this helps

Answer:

The answer is Near The Ocean Ridges.

Answer:

2 Mg(s) + O2(g)→ 2 MgO(s)

Explanation:

Number of moles of magnesium reacted = mass/ molar mass = 3.28g/24gmol-1 = 0.137 moles

From the balanced reaction equation;

2 moles of Mg yields 2 moles of MgO

0.137 moles of Mg yields 0.137 moles of MgO

For oxygen;

Number of moles of oxygen reacted = mass/ molar mass = 7.5g/32gmol-1 = 0.234 moles of O2

If 2_moles of oxygen yields 2 moles of MgO

0.234 moles of oxygen yields 0.234 moles of MgO

Hence Mg is the limiting reactant

Theoretical yield of MgO = 0.137 moles × 40 gmol-1 = 5.48 g of MgO

% yield of MgO = 83.7%

But

% yield = actual yield/theoretical yield × 100

actual yield = % yield × theoretical yield / 100

actual yield= 83.7 × 5.48/100

Actual yield = 4.59 g

According to the equation;

2 moles of Mg reacts with 2 moles of oxygen

Hence 0.137 moles of Mg will react with 0.137 moles of O2

Amount of excess reactant = 0.234 moles - 0.137 moles = 0.097 moles

Mass of excess reactant = 0.097 moles × 32gmol-1 = 3.1g of O2

Answer:

B

Explanation:

I did the test