. Calculate the frequency of a photon with an energy of 2.55 x 10-18 J

Answer:

2 oxygen atoms make oxygen gas

A molecule of oxygen gas is composed of two oxygen atoms chemically bonded together. The symbol for oxygen is "O," and the atomic number is 8, indicating that each oxygen atom has 8 protons in its nucleus.

A covalent bond is a type of chemical bond that occurs between two atoms when they share one or more pairs of electrons. It is a strong bond that holds atoms together to form molecules.

In a covalent bond, atoms share electrons in order to achieve a more stable electron configuration, typically by filling their outermost energy levels (valence shells). By sharing electrons, both atoms involved in the bond can achieve a more stable configuration, similar to the noble gas configuration.

In an oxygen gas molecule, the two oxygen atoms are held together by a covalent bond. Covalent bonds involve the sharing of electron pairs between atoms. In the case of oxygen gas, each oxygen atom shares two electrons with the other oxygen atom, resulting in a stable molecule.

Therefore, a molecule of oxygen gas is made up of two oxygen atoms (O) bonded together by a covalent bond.

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Answer:

Asexual reproduction does not involve sex cells or fertilisation . Only one parent is required, unlike sexual reproduction which needs two parents. Since there is only one parent, there is no fusion of gametes and no mixing of genetic information.

The main difference between sexual and asexual reproduction is that sexual reproduction involves the fusion of gametes, while asexual reproduction does not.

In sexual reproduction, offspring are produced through the fusion of gametes (reproductive cells) from two parent organisms. This fusion, known as fertilization, results in offspring that inherit genetic material from both parents. This genetic recombination introduces variation in the offspring, promoting genetic diversity within a population.

In contrast, asexual reproduction involves the production of offspring without the involvement of gametes or the fusion of genetic material from two parents. A single parent organism reproduces by generating genetically identical or near-identical offspring through various methods such as budding, fragmentation, or binary fission. Asexual reproduction typically leads to offspring that are genetically identical to the parent, lacking the genetic diversity observed in sexual reproduction.

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Answer:

Explanation:

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

\(volume = \frac{mass}{density} \\ \)

From the question.

density = 0.017 g/mL

mass = 4 g

We have

\(volume = \frac{4}{0.017} \\ = 235.2941176...\)

We have the final answer as

Hope this helps you

The term used for the geometrical isomer shown below is the term "cis-isomer."

Cis-trans isomerism, also known as geometric isomerism or configurational isomerism, is a type of stereoisomerism that occurs in alkenes and cyclic compounds.

Cis-isomer and trans-isomer are two types of stereoisomers.

Cis-isomer refers to a molecule in which two functional groups or substituents are on the same side of the double bond or ring.

Cis-isomerism occurs when substituents on a double bond or ring have the same spatial orientation.

The molecule shown below is an example of a cis-isomer.

Cis-isomers and trans-isomers have the same molecular formula and sequence of bonded atoms but differ in their spatial arrangement.

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Answer:

Hey mate here's your answer ⤵️

a mark or character used as a conventional representation of an object, function, or process, e.g. the letter or letters standing for a chemical element or a character in musical notation.

noun: letter, character, sign of written communication

Something used for or regarded as representing something else; a material object representing something,

or a character of some kind

Example:

Often something immaterial; emblem, token, or sign: "$"<< the dollar sign is a symbol used to show / means money

Hope this kinda helped

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{1.52908 \times {10}^{24} }{6.02 \times {10}^{23} } \\ \)

We have the final answer as

Hope this helps you

Answer:

A) Oxygen

Explanation:

An element is defined as something made of only 1 type of atom. Brass and rust are made up of many types of atoms, and water has two types of atoms, hydrogen and oxygen. Oxygen is made up of two oxygen atoms, which are the same element. So, by definition, oxygen is an element.

Answer:A

Explanation:

An atom which an electron moves from the first to the third shell atom absorbs more energy.

An atoms may occupy different energy states . The energy states are discrete , that means they occur at specific values only. Therefore an atom can only move to a new energy level if it absorbs or emits an amount of energy that exactly corresponds to the difference between two energy levels.

The lowest possible energy levels that the atom can occupy is called ground state.The energy levels which is higher to the ground state is called excited state.

The more energy absorb when electron move from first to third because in this second energy level have to pass to reach at third energy level.

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Answer:

it would be C

Explanation:

Answer: C

Explanation:

both numbers have 2 S.F. so the answer should have 2 too.

Approximately 5272.2 grams of PbCl4 were added to 2700 grams of ethanol to increase the boiling point by 6.8 degrees.

To determine the grams of PbCl4 added to 2700 grams of ethanol, causing the boiling point to increase by 6.8 degrees, we will use the molality-based boiling point elevation formula, which is:

ΔTb = Kb * m

Here, ΔTb is the change in boiling point (6.8 degrees), Kb is the molal boiling point elevation constant of ethanol (1.22 °C kg/mol), and m is the molality (moles of solute per kg of solvent).

First, we need to find the molality (m) of the solution:

6.8 = 1.22 * m
m = 6.8 / 1.22 ≈ 5.57 mol/kg

Now, we can calculate the moles of PbCl4 added to the ethanol:

5.57 mol/kg * (2700 g / 1000 g/kg) ≈ 15.03 mol of PbCl4

Next, we need to find the molar mass of PbCl4:

Pb: 207.2 g/mol
Cl: 35.45 g/mol

Molar mass of PbCl4 = 207.2 + (4 * 35.45) ≈ 350.6 g/mol

Finally, we can calculate the grams of PbCl4 added to the ethanol:

15.03 mol * 350.6 g/mol ≈ 5272.2 g

Therefore, approximately 5272.2 grams of PbCl4 were added to 2700 grams of ethanol to increase the boiling point by 6.8 degrees.

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1. Lithium 2. Fluorine 3. Aluminum

Bohr's atomic model came into existence with the modification of Rutherford's model of an atom. Bohr explained that the electrons move in fixed orbitals and also explained that each orbit has a fixed energy.

Postulates are given by Bohr:

Based on these postulates the names of atoms shown in the figure are:

1. Lithium: Atomic number is 3 therefore, it has three protons in the nucleus.

2. Fluorine: Atomic number is 9 and it has 9 protons in the nucleus.

3. Aluminum: Atomic number is 13 and it has 13 protons in the nucleus.

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As the environmental pH or temperature of a particular enzymatic reaction is changed, the activity of the enzyme may decrease due to denaturation.

Enzymes are proteins that speed up chemical reactions by binding to substrates and converting them into products. The environmental conditions in which enzymes function, such as pH and temperature, can have a significant effect on their activity.Proteins are delicate molecules that require specific conditions to remain functional. Enzymes can lose their functionality if the environmental pH or temperature is changed too much.

This results in a process called denaturation, which causes the protein to lose its shape and functionality. Denaturation results from changes in the interactions between the amino acid residues that make up the protein's three-dimensional structure.As a result, the activity of the enzyme is reduced or lost. The specific temperature or pH value that results in denaturation varies depending on the enzyme. However, there is typically an optimum temperature and pH value for each enzyme, where the enzyme is most active. If the environmental pH or temperature moves too far from this optimum value, the enzyme activity will decrease or stop altogether.

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NaHCO3(s) + HC2H3O2(aq) → CO2(g) + H2O(l) + NaC2H3O2(aq)

This equation represents the reaction of baking soda (sodium bicarbonate) with vinegar (acetic acid) to generate carbon dioxide gas, water, and sodium acetate.

The balanced equation for the reaction of NaHCO3(s) with HC2H3O2(aq) including phase symbols is

NaHCO3(s) + HC2H3O2(aq) → CO2(g) + H2O(l) + NaC2H3O2(aq)

Baking soda, also known as sodium bicarbonate, is a white, crystalline powder with the chemical formula NaHCO3. It is an alkaline substance that neutralizes acids.

Vinegar is mostly composed of acetic acid, HC2H3O2, which is a weak acid. Vinegar has a sour flavor and a strong smell due to the presence of acetic acid.

NaHCO3(s) + HC2H3O2(aq) → CO2(g) + H2O(l) + NaC2H3O2(aq)  This equation represents the reaction of baking soda (sodium bicarbonate) with vinegar (acetic acid) to generate carbon dioxide gas, water, and sodium acetate. When the baking soda and vinegar are combined, a chemical reaction occurs, causing carbon dioxide gas bubbles to form. This is due to the reaction between the acid and base in the mixture, which generates carbon dioxide gas as a byproduct. This reaction is commonly used in baking as a leavening agent to make cakes, muffins, and other baked goods rise.

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Answer:

(simple differences)Biodegradable substances are those that degrades or break down naturally...

Non-biodegradable substances are those that do not degrades easily...

Answer:

Biodegradable substances are those that degrades or break down naturally

Non-biodegradable substances are those that do not degrades easily

13.015  grams of acetylene (C2H2) are required to produce 1.0 moles of CO2.

To find the number of grams of acetylene (C2H2) required to produce 1.0 moles of CO2, we can use the balanced equation for the combustion of acetylene: 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)

From the balanced equation, we know that for every 2 moles of C2H2 that react, 4 moles of CO2 are produced. Therefore, if we want to produce 1.0 moles of CO2, we need to react 1.0 moles of CO2 / 4 moles CO2/ 2 moles C2H2 = 0.5 moles of C2H2.

To convert moles to grams, we use the molar mass of C2H2 which is 26.03 g/mol

So, 0.5 moles of C2H2 = 0.5 x 26.03 g/mol = 13.015 g C2H2

Therefore 13.015  grams of acetylene (C2H2) are required to produce 1.0 moles of CO2

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Answer:

magnesium + oxygen ----> magnesium oxide

Answer: Magnesium+Oxygen=Magnesium Oxide

Explanation:

Mg is the chemical symbol for magnesium and O is the chemical symbol for Oxygen.

MgO is Magnesium Oxide because when you react a metal with oxygen you get a ‘metal oxide’.

Answer:

41.03 %

Explanation:

Given that,

The actual length of a strip of aluminum is 2.12 m

Observed length of a strip of aluminum is 1.25 m

We need to find the student's percent error. The percentage error on any value is given by :

\(\%=\dfrac{\text{observed-actual}}{\text{actual}}\times 100\)

Putting all values, we get :

\(\%=\dfrac{2.12-1.25}{2.12}\times 100\\\\\%=41.03\ \%\)

So, the percent error of the student is 41.03 %.

Answer:

Inference

Explanation:

I mean, it's not difficult.

A theory is an unproven explanation.

An inference is a guess/educated guess where you don't have all the facts.

For example, if "Bob" is caught in the kitchen with a ketchup stain on his shirt, you are inferencing that he used the ketchup.

However, if you see a ketchup bottle nearby or saw it earlier, then it is not, because you already have the facts that ketchup was used.

Answer:

A dunes windward side is the side where the wind is blowing and pushing material up. A dunes slip face is simply the side without wind. A slipface is usually smoother than a dunes windward side. A collection of dunes is called a dune belt or dune field.

Explanation:

Hope this helps...

Answer:

b. glutamate

Explanation:

Answer:

1. The warming climate has dried out California's landscape, turning it into a tinderbox. ... This is due in part to climate change: rising temperatures, have an exponential impact when it comes to setting the stage for catastrophic wildfires,

2. Due to the heat and temperature of the place and if the place is very dry.

3. It all depends on the weather. At times there can be less rain whereas at time there is a lot of rain or how much heat it is outside within years

4. Well California is really hot during the summer and it becomes really dry so that is the reason forest fires are getting worse

The balanced equation for the redox reaction when Al metal reacts with HCl is 2Al + 6HCl -> 2\(AlCl_{3}\) + 3\(H_{2}\).

To balance the redox equation for the reaction between aluminum metal and hydrochloric acid using the electron transfer method, follow these steps:

Step 1: Write the unbalanced equation:
Al + HCl -> \(AlCl_{3}\) + \(H_{2}\)

Step 2: Separate the equation into half-reactions:
Oxidation half-reaction: Al -> \(Al^{3+}\)
Reduction half-reaction: \(H^{+}\) -> \(H_{2}\)

Step 3: Balance the atoms in each half-reaction, except for oxygen and hydrogen:
Oxidation half-reaction: Al ->  \(Al^{3+}\) (already balanced)
Reduction half-reaction: 2\(H^{+}\) -> \(H_{2}\)

Step 4: Balance the charges in each half-reaction by adding electrons:
Oxidation half-reaction: Al -> \(Al^{3+}\) + 3\(e^{-}\)
Reduction half-reaction: 2\(H^{+}\) + 2\(e^{-}\) -> \(H_{2}\)

Step 5: Equalize the number of electrons transferred in both half-reactions by multiplying the half-reactions by appropriate factors:
Oxidation half-reaction: 2(Al -> \(Al^{3+}\) + 3\(e^{-}\) ) -> 2Al -> 2\(Al^{3+}\)  + 6\(e^{-}\)
Reduction half-reaction: 3(2\(H^{+}\)  + 2\(e^{-}\) -> H2) -> 6\(H^{+}\)  + 6\(e^{-}\) -> \(H_{2}\)

Step 6: Add the balanced half-reactions back together:
2Al + 6\(H^{+}\) -> 2\(Al^{3+}\) + 3\(H_{2}\)

Step 7: Add back the spectator ions (chloride ions) to complete the balanced equation:
2Al + 6HCl -> 2\(AlCl_{3}\) + 3\(H_{2}\)

The balanced redox equation using the electron transfer method is:
2Al + 6HCl -> 2\(AlCl_{3}\) + 3\(H_{2}\)

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The new volume is calculated in each condition as follows using ideal gas equation .

The ideal gas law is the equation of condition of an ideal gas. It states that pressure into volume is equal to nRT where n is moles and T is temperature.

1. P1V1=P2V2

50*100= V2 * 10

V2= 500 Liter

2. V1/T1 = V2/T2

20/200 = V2/400

V2= 40 Liter

3. P1V1=P2V2

100*20= V2 * 60

V2= 33.33 Liter

4.  V1/T1 = V2/T2

800/400 = V2/100

V2= 200 Liter

5. P1V1/T1 = P2V2/T2

20*100/100 = 10*v2/200

v2= 400 Liter

6. P1V1/T1 = P2V2/T2

5*200/100 = 10*v2/50

v2= 50 Liter

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Answer:

P.E = 14,400J or 14.4kJ

Explanation:

Hello,

This question requires us to calculate the elastic potential energy of a cord. To do this, we should get our data first from the question and then proceed on how to approach the question.

Data;

Spring constant (k) = 800Nm²

Displacement (x) = 6m

Elastic potential energy (P.E) = ½kx²

P.E = ½kx²

k = force or spring constant

x = displacement

P.E = ½ × 800 × 6²

P.E = ½ × 28800

P.E = 14,400J

P.E = 14.4kJ

The potential energy is 14,400J or 14.4kJ

Therefore, the bungee cord has a potential energy of 14.4kJ

Answer:

14,400J

Explanation:

Answer:

+35

Explanation:

Answer:

The earlier bog bodies that were discovered in the 1600s might have not been preserved properly due to a lack of knowledge on how to preserve them or a lack of awareness of their significance. It is also possible that they might have decayed and decomposed over time and not survived till the present day. However, the bog bodies found after the late 1800s were preserved and studied extensively due to the increasing awareness and understanding of their historical and archaeological significance.

Explanation:

Hope this helped!! Have a great day/night!!

The correct organisation of the following transformation in order is as follows:

A chemical reaction is a process involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.

According to this question, a transformation involving copper metal is involved in this question. The copper metal begins by reacting with an acid (nitric acid) to form copper nitrate.

The correct order of the transformation of the copper metal through different phases is as given above.

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