In this molecule, what's the formal charge on the central O atom?
A. -1
B. -2
C. 0
D. +1

Answer:

Solution B: [OH-] = 1×10^–6 M

Solution C: [OH-] = 1×10^–6 M

Explanation:

Solution B:

Hydronium ion concentration, [H3O+] = 9.99×10^–9 M

Hydroxide ion concentration, [OH-] = ?

The Hydroxide ion concentration, [OH-] can be obtained as follow:

[H3O+] × [OH-] = 1×10^–14

9.99×10^–9 × [OH-] = 1×10^–14

Divide both side by 9.99×10^–9

[OH-] = 1×10^–14 / 9.99×10^–9

[OH-] = 1×10^–6 M

Therefore, the Hydroxide ion concentration, [OH-] is 1×10^–6 M

Solution C:

Hydronium ion concentration, [H3O+] = 0.000777 M

Hydroxide ion concentration, [OH-] = ?

The Hydroxide ion concentration, [OH-] can be obtained as follow:

[H3O+] × [OH-] = 1×10^–14

0.000777 × [OH-] = 1×10^–14

Divide both side by 0.000777

[OH-] = 1×10^–14 / 0.000777

[OH-] = 1.29×10^–11 M

Therefore, the Hydroxide ion concentration, [OH-] is 1.29×10^–11 M

Answer:

RCOOR

Explanation:

Odyssey ware

RCOOR is the functional group for an ester. An ester is an organic molecule created when an acid and an alcohol interact. The general structure of the compound is RCOOR, where R is an aryl or alkyl group.

This functional group is made up of an alkyl or aryl group (R) and a carbonyl group (C=O) linked to an oxygen atom. Two additional carbon atoms, one of which is a member of the carbonyl group and the other of which is a member of the alkyl or aryl group, are joined to the oxygen atom.

The connection between the oxygen atom and the hydrogen atom of the acid is broken during the interaction of an acid with an alcohol to create an ester.of a fresh connection between the oxygen atom and the alcohol's alkyl or aryl group. As a result, the RCOOR functional group is created.

Esters are significant organic substances with many different uses. They serve as solvents and are employed in the synthesis of flavours, perfumes, polymers, medicines, and other products. They are also employed in the creation of fragrances and cosmetics, as well as as lubricants. Other organic compounds can be made using esters as intermediates.

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Answer:

A. 20 grams of milk at 10°C

Explanation:

Since we refrigerate milk, it would be cooler than the room temperature, which standard norm is 25°C. So the milk has to be colder than the room temperature. Therefore, our answer is A.

Answer: A is the correct answer

Explanation:

The temperature of room temperature is more than that and you need to keep it colder, hope this helped!

Answer:

The final temperature of the bomb calorimeter is 82.98°C

Explanation:

The given information are;

The mass of the propane sample =  10.0 g

The heat capacity of the bomb calorimeter = 8.0 kJ/°C

The molar heat of combustion of propane is -2,222 kJ/mol.

The starting (initial) temperature of the water, T₁ = 20°C

The final temperature of the bomb calorimeter = T₂

The molar mas of propane = 44.1 g/mol

The number of moles, n, of propane present in 10.0 g of propane is found as follows;

[tex]Number \ of \ moles \ of \ propane, \ n = \dfrac{Mass \ of \ propane}{Molar mass \ of \ propane} = \dfrac{10}{44.1} = 0.227 \ moles[/tex]Which gives;

The heat, Δh, released from the combustion of 10.0 g of propane = 0.227 × -2222 kJ/mol  

Δh = -503.85 kJ/mol  

Heat gained by the calorimeter = Heat released from the combustion of 10.0 g of propane = 503.85 kJ/mol  

Change in heat, Δh[tex]_c[/tex] in the calorimeter = Heat capacity × Temperature change

Δh[tex]_c[/tex] = m × C

503.85 kJ/mol = 8.0 kJ/°C × (T₂ - 20°C)

T₂ = -503.85 kJ/mol/(8.0 kJ/°C) + 20°C = 82.98°C

The final temperature of the bomb calorimeter = 82.98°C

Answer:

D. 1:1

Explanation:

For every 1 mole of chlorine (Cl₂), there is one mole of calcium chloride (CaCl₂).

So, the mole ratio of chlorine to calcium chloride is 1:1.

Hope this helps. :)

The mole ratio of chlorine to calcium chloride in the given chemical reaction is 1:1.

Stoichiometry of the reaction gives idea about the relative amount of moles of reactants and products present in the given chemical reaction.

Given chemical reaction is:

Ca + Cl₂ → CaCl₂

From the stoichiometry of the given reaction it is clear that,

1 mole of chlorine = reacts with 1 mole of calcium chloride

So, mole ratio = Chlorine / calcium chloride = 1:1

Hence required mole ratio is 1:1.

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Answer:

c). 2-iodopropane

14) C). Fluoroethene

16) D). More chemically reactive

17) 1). High temperature combustion  - Dioxins/furans

2). Pulp and paper industry  - SO2(g)

3). Pesticides  - Phosphates

4). Sour gas plants - Nox(g)

Explanation:

The correct name for molecule I would be '2-iodopropane' where the number 2 reflects the position of iodine. There are three carbons and 8 hydrogen atoms which reflect that it is an alkane compound. In the given carbon chain. In this chain of three carbons, iodine is present on the second carbon. Therefore, option C is the correct answer.

14). The appropriate name for molecule III exemplifies Fluoroethene as it consists of two carbons due to which it belongs to the 'ethane' group and it bears the prefix 'fluoro as it belongs to fluorine group and the suffix '-ene' due to double bond.

16). Synthetic hydrocarbons are 'more chemically reactive' and therefore, it generates greenhouse gases and leads to climate change, global warming, depletion of the ozone layer, etc.

17). 1). Dioxins are generated as a result of high-temperature combustion processes like commercial waste incineration or burning of fuels.

2). Pulp and paper industry releases various gases like nitrogen oxide, sulfur dioxide SO2(g), carbon dioxide, etc.

3). Phosphate is the pollutant released from pesticides that badly affects the fertility of the soil.

4). Nox(g) nitrogen oxide released by sour gas plants and coal-fired emissions is a major contributor to increased greenhouses gases and global warming.

Answer:

The second on, A man who works as a computer programmer and sits at desk magority of the day.

Explanation:

Answer:

Explanation:

The only answer I can think as being possible is the last one. Pesticides are chemicals that go after unwanted animal life. They do not know that they should not attack human beings.

Infertility could very well be one of the side effects of a pesticide. There are others as well. Some pesticides go after the central nervous system (think mice and rats) and those are dangerous to use and to leave around.

The others all involve occupations that either require authentic abilities or mental astuteness. Neither should affect a man's ability to reproduce.

Answer:

34.08 g

Explanation:

Take the atomic mass of N=14.0, H=1.0/

no. of moles=mmass/molar mass

no. of moles of N2 used = 28.02 / (14x2)

=1.0007mol

From the equation, the mole ratio of N2 : NH3 = 1: 2,

so one mole of N2 produces 2 moles of NH3.

Using this ratio, we can deduce that the no. of moles of NH3 = 1.0007x2

= 2.001428mol

mass = no. of moles x molar mass

Hence,

mass of NH3 produced = 2.001428 x (14+1x3)

= 34.03

≈C

Answer:

Correct, because B it is reported to the nearest miligram

Explanation:

4.6 rounded up is 5

Answer:

Mechanical energy

Answer:

Mechanical Energy

Explanation:

The mechanical energy is the sum of the objects potential energy (energy the object possess due to its position) and its kinetic energy (energy the object possess due to its motion). Adding this two energies together, gives the total mechanical energy.

The pH of a substance can only be determined when it is frozen. Hence, option B is correct.

pH stands for Hydrogen potentials.

The use of the pH scale is one practical way of quantitatively determining how acidic something is.

If the pH of a solution is less than 7, it is acidic. If the pH is 7, the solution is neutral and if the pH is greater than 7,the solution is basic.

The pH of a substance can only be determined when it is frozen. Hence, option B is correct.

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Answer:

Four ways to test a copper penny are given below:-

Explanation:

Answer: Fossils of the species have never been found because:-

a. There were few members of the species.

d. Their bodies decompose quickly.

For an organism to become fossil it is important that it do not decompose before it get buried by sediments.

What are fossils?

A fossil is any preserved remains, impression, or trace of any once-living thing from a past geological age.

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Answer: The answer is B and A.

Explanation:

I took the test!

Answer:

0.04 L

Explanation:

The following data were obtained from the question:

Concentration of stock solution (C1) = 18M

Volume of stock solution needed (V1) =?

Concentration of diluted solution (C2) = 1.5M

Volume of diluted solution (V2) = 0.5L

The volume of the stock solution needed can be obtain by using the dilution formula.

This is illustrated below:

C1V1 = C2V2

18 x V1 = 1.5 x 0.5

Divide both side by 18

V1 = (1.5 x 0.5)/18

V1 = 0.04L

Therefore, the volume of the stock solution needed is 0.04L.

Answer:

The answer to your question is given below

Explanation:

In this reaction, the calcium metal, Ca loses two electrons to form calcium ion, Ca^2+ and two fluorine atoms, F receives the two electrons to form two fluoride ion, F^-.

This is illustrated by the following equation:

Ca —> Ca^2+ + 2e

2F + 2e –> 2F^-

Ca + 2F + 2e —> Ca^2+ + 2F^- + 2e

Cancel out 2e

Ca + 2F —> Ca^2+ 2F^-

Thus, the electronic configuration can be written as follow:

Before combination:

Calcium, Ca (20) => 2, 8, 8, 2

Two fluorine atom, F (9) => 2, 7 and 2, 7

After combination:

Calcium ion, Ca^2+ => 2, 8, 8

Two fluoride ion, F^- => 2,8 and 2,8

Answer:

These reactions are similar because the process is similar and the products are carbon dioxide they are different because the substances are different to outgo these reactions

Explanation:

Answer:

Cl₂ > Br₂ > I₂

Explanation:

An oxidizing agent gains electron for itself by removing electrons from other reactants during a reaction. Oxidation is the loss of electrons. Chlorine can take electron from bromine and chlorine while bromine can take electron from iodine, therefore chlorine is a more oxidizing agent than bromine and iodine while bromine is a more oxidizing agent than iodine.

Oxidizing ability decreases down the group.

Therefore Cl₂ > Br₂ > I₂

Answer:

86.5%

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

2Na + 2HF –> 2NaF + H2

Next, we shall determine the theoretical yield of the hydrogen gas, H2. This is illustrated:

From the balanced equation above,

2 moles of Na reacted to produce 1 mole of H2.

Therefore, 5.75 moles of Na will react to produce = (5.75 x 1)/2 = 2.88 moles of H2.

Therefore, the theoretical yield of Hydrogen gas, H2 is 2.88 moles.

Finally, we shall determine the percentage yield of Hydrogen gas, H2. This can be obtained as follow:

Actual yield of H2 = 2.49 moes

Theoretical yield of H2 = 2.88 moles

Percentage yield of H2 =.?

Percentage yield = Actual yield /Theoretical yield x 100

Percentage yield = 2.49/2.88 x 100

Percentage yield = 86.5%

Therefore, the percentage yield of Hydrogen gas, H2 is 86.5%.

Answer:

Ph.D

Explanation:

For the most part, research scientists need a bachelor's degree in a highly associated field. A master's degree or a doctorate is frequently expected.