CHEMISTRY HIGH SCHOOL

A 10.0 mL syringe contains 0.10 g of nitrogen gas at 0.0 degrees Celsius. What is the pressure inside the syringe?

Answers

Answer 1
Answer: Since the sample inside the syringe is a gas, we assume that it is an ideal gas that is we use the expression PV = nRT. We can easily calculate the pressure as follows:

n = m /MM = 0.10 / 28 = 0.0036 mol

P = nRT / V = 0.0036(0.08206)(273.15) / 0.010
P = 8 atm
Answer 2
Answer:

Answer:

The correct answer is 8.0 atm.

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Compounds are formed when the atoms of two or more elements are chemically combined.What type of bond is formed if atoms donate electrons to other atoms when the elements are combined?

A. ionic bond
B. hydrogen bond
C. covalent bond

Answers

Fully donating an electron results in an ionic bond, so A is the correct answer.

In comparison, B, a hydrogen bond, is a bond that forms between an H in one compound and an O, N, or F in another.  It is among the strongest of intermolecular forces, while ionic/covalent bonds are intramolecular.

C, a covalent bond, is a bond that forms when atoms share electrons instead of donating them.

Describe how activity within the earth results in earthquakes

Answers

When the plates either move together, apart or slide beside each other

In order to observe a property of a substance, the substance must interact with another substance, such as when gasoline burns or when sodium metal reacts with water.

Answers

Observing a property of a substance can be done through experiments. Most of these experiments are done by a chemical reaction. A chemical reaction involves two substances interacting with each other. However, not all property of a substance can only be observed through a reaction. Like melting experiment, freezing point determination and boiling point determination, only heat is added or is removed to the substance in order to see that certain property.

answer:

chemial

Explanation:

chemical reactions include the reactivity of an object. physical properties do not include reactivity and electrical and thermal properties are not reactivity either

"For the following compound with three carbonyl groups, can you rank these carbonyl groups in order of increasing wavenumber in an infrared (IR) spectrum, and explain the reasoning behind the ranking?"

Answers

Explanation:

The wavenumber of absorption peaks in an infrared (IR) spectrum is related to the vibrational frequencies of chemical bonds within a molecule. Different functional groups and bond types exhibit characteristic wavenumbers in the IR spectrum. When ranking carbonyl groups in a compound by increasing wavenumber, you can consider the following principles:

1. Single bonds vibrate at lower wavenumbers than double bonds.

2. Carbon-oxygen double bonds (C=O) vibrate at higher wavenumbers than carbon-oxygen single bonds (C-O).

3. The presence of electron-withdrawing groups can increase the wavenumber of the carbonyl group.

Based on these principles, here's how you can rank the carbonyl groups in the compound from lowest to highest wavenumber:

1. Carbonyl group without any adjacent electron-withdrawing groups (lowest wavenumber): This carbonyl group, if it's surrounded by alkyl or other non-electron-withdrawing groups, will have the lowest wavenumber since it's less polar and experiences weaker stretching vibrations.

2. Carbonyl group with adjacent electron-withdrawing groups: If a carbonyl group is adjacent to electron-withdrawing groups (e.g., nitro groups, fluorine atoms, etc.), it will have a higher wavenumber. The presence of these groups increases the polarity and strength of the C=O bond, causing it to vibrate at a higher frequency.

3. Carbonyl group in a conjugated system: If a carbonyl group is part of a conjugated system (alternating single and double bonds), it will have the highest wavenumber. Conjugation enhances the electron delocalization and increases the wavenumber of the carbonyl group.

So, in summary, the ranking of carbonyl groups by increasing wavenumber in an IR spectrum would generally be: carbonyl without adjacent electron-withdrawing groups < carbonyl with adjacent electron-withdrawing groups < carbonyl in a conjugated system.

Which is a product of a condensation reaction? 1. O2 2. CO2 3. H2 4. H2O

Answers

The correct answer is H2O, it is a product of a condensation reaction. It is a type of chemical reaction where two molecules combine to form a larger molecule together with a loss of a small molecule. Usually, this small molecule is water.

Answer:

H_(2)O is a product of a condensation reaction.

Explanation:

In a condensation reaction, two molecules are combined to produced a large molecules along with removal of a water molecule.

For an example, let's consider aldol condensation reaction.

In aldol condensation reaction, an enolate anion reacts and combines with an aldehyde or ketone molecule follwed by dehydration. In that dehydration step  , H_(2)O gets removed and an unsaturated carbonyl product is formed.

Usually, O_(2),CO_(2) and H_(2) are produced as a by product of a decomposition reaction.

Which of the following observations led physicist James Chadwick to perform experiments that eventually led to the discovery of the neutron?A. Protons alone were not able to account for the density of an atoms nucleus.

B. Atomic nuclei possess shells similar to the electron shells of atoms.

C. Some atoms contained more protons than electrons.

Answers

The correct answer is letter C. James Chadwick confirmed the existence of neutrons.In his experiment, he was able to show that the particles that were ejected had no electrical charge but had almost the same mass as the proton. These particles were, of course, neutrons.
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