**Answer:**

**Explanation:**

To find the number of entities in a given substance we use the formula

N = 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

However we weren't given the number of moles only the mass of oxygen was given. we can find the number of moles from that by using the formula

[tex]n = \frac{m}{M} \\ [/tex]

m is the mass

M is the molar mass

n is the number of moles

Molar mass of oxygen = 16 g/mol

mass in question = 25 g

We have

[tex]n = \frac{25}{16} = 1.56 \\ [/tex]

number of moles = 1.56 mol

The number of oxygen atoms is equal to

N = 1.56 × 6.02 × 10²³ = 9.3912 × 10²³

We have the final answer as

9.4 × 10²³ oxygen atomsHope this helps you

How does temperature of land far from water compare to that of land near water?

The temperature of land far from water is hotter than land near water.

The temperature of land far from water is less stable compared to land near water.

The temperature is similar for land both near and far from water.

The temperature is either too hot or too cold near water.

The **temperature **of land far from **water **is hotter than land near water.

The lower heat capacity of land often allows them to cool the nearby water **temperature **so it takes less energy to change the **temperature **of land compared to water bodies. This means that land heats and cools more quickly as compared to **water**. This difference affects the climate of different areas on Earth. Large bodies of **water **like oceans, seas and large lakes can affect the climate of the nearby regions such as coastal regions. **Water **heats and cools more slowly than land regions. The coastal regions will stay cooler in summer season and warmer in winter season, which creates moderate climate on the coastal regions.

So we can conclude that the **temperature **of land far from **water **is different from land near water because of cooling effect of **water **bodies.

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Is pollution parasitism or commensalism

The answer would be **parasitism**.

Let's define each term.

**Parasitism**: A relation between organisms in which one lives as a parasite on another.

**Commensalism**: A type of relationship between two species of plant, animal, fungus, etc., in which one lives with, on, or in another without damage to either.

**Pollution**: The introduction of harmful substances or products into the environment; the act of polluting or the state of being polluted.

Under some conditions, parasitism poses a major hazard to hosts, and environmental pollution has a detrimental impact on organism health as well. The concomitant effects of contaminants and parasites on an organism's physiological homeostasis are poorly understood. The current study indicates that parasites can: I affect how pollutants are metabolized by infected hosts; (ii) interact with pollution in positive or negative ways; and (iii) cause physiological changes in hosts that were previously assumed to be caused by pollution. Fish infected with acanthocephalans have lower metal levels than uninfected hosts, according to experimental studies on the uptake and accumulation of metals by fish. For instance, Pomphorhynchus laevis lowers lead levels in fish bile, which lessens or impedes the cycling of lead in the liver and intestines, potentially lowering the amount of metals available to fish. Thus, changes in pollutant absorption and accumulation caused by parasites in various intermediate and ultimate hosts are crucial to the study of ecotoxicology. Along with these changes, there is a strong relationship between the impacts of pollutants and parasites that appears to be partly mediated by the endocrine system, which is intimately linked to the immune system in fish. Studies in the lab on eels that had been artificially infected with the swimbladder worm Anguillicola crassus have shown that harmful substances like polychlorinated biphenyls have immunosuppressive effects that make parasite infection easier. Similar to this, a decrease in anti-A. crassus antibody levels is associated with an increase in blood cortisol concentration in eels as a result of chemical exposure and infection. Additionally, parasites are capable of inducing physiological modifications that are ascribed to substances with endocrine disrupting action, for instance, the cestode Ligula intestinalis is known to inhibit roach gonad growth. Roach are the best instances of endocrine disruption in wild fish, and it is likely that this disruption may be brought on by parasites like L. intestinalis or members of the phylum Microspora in addition to chemical action.

Thanks,

Eddie

**Answer:**

the answer is parasitism

C2H4O2 IS THE EMPIRICAL FORMULA FOR GLUCOSE?

The** empirical formula** of the **glucose **molecule is written as [tex]CH_{2} O[/tex].

Let us recall that glucose is the molecule that is response for the **quick release** of energy in the body. It is also the molecule that is first formed in the process of photosynthesis.

The term carbohydrate actually means a compound that is a hydrate of carbon and it is composed of glucose molecules. The empirical formula shows the relationship or the **ratio **of the atoms that could be found in a compound. We can see that we can obtain the ratio from the number of each of the atoms present.

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How can you find the number of particles in a salt packet of known mass?Place the tiles to complete the equation to convert from grams to particles. Refer to the mole road map to determine the correct conversion factors. Use the space below to take notes or make calculations if needed.

First, you need to transform grams of NaCl into moles of NaCl. For this, you will divide by its molar mass. If you divide a fraction, If you divide a fraction, it is inverted and multiplied. So first you have:

**0.75 g NaCl x 1 mol NaCl / 58.4 g/mol NaCl = 1.28 x 10^-2 moles**

Now you need to use the avogrado's constant to find the number of particles. The avogrado's constant value is 6.02x10^23 mol^-1.

So you have:

**0.75 g NaCl x 1 mol NaCl / 58.4 g/mol NaCl x 6.02 x 10^23 particles NaCl / 1 mol NaCl = 7.73 x 10^21 particles of NaCl**

An instantaneous dipole occurs when a molecule's moving electrons are briefly more concentrated in one place than another, causing the molecule to become temporarily polarized.

True

False

An instantaneous **dipole** occurs when a molecule's moving **electrons** are briefly more concentrated in one place than another, causing the molecule to become temporarily polarized.

The correct option is True.

What are dipoles?**Dipoles** refer to a separation of charges where one end of a substance has a positive charge while the other end has a negative charge.

In chemical compounds, dipoles occur within a molecule that has covalently bonded atoms or atoms that share **electrons** in the** covalent bond.**

The dipole may be permanent dipoles or temporary dipoles.

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A piece of metal has a mass of 32.4g and has a volume of 24.9cm³. What is its

density?

A piece of metal has a **mass **of 32.4g and has a **volume **of 24.9cm³, then its **density **is 1.301 g/cm³

**Density **is defined as **mass **of a material substance per unit of the **volume**. The equation for **density** is d = M/V, where d stands for **density**, M for **mass**, and V for **volume**.

Grams per cubic centimeter are a common unit of **density **measurement. For instance, the **density **of Earth is 5.51 grams per cubic centimeter, whereas the **density **of water is 1 gram per cubic centimeter.

**Density **measures how tightly a **mass **of matter is packed. The **density **of a **mass **depends on how tightly it is packed in relation to the **volume **that it takes up. A low **density **substance, on the other hand, has a lower **mass **to **volume **ratio.

The amount of a substance present when its **density **is being measured ought not to have an impact on its **density**, in theory. The ratio of **mass **to **volume **should be constant regardless of the size of the sample being tested.

The formula of density is

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

Where,

[tex]\rho[/tex] = **density**

m = **mass**

V = **volume**

We have given

m = 32.4g

V = 24.9cm³

[tex]\rho[/tex] = 32.4g/24.9cm³

[tex]\rho[/tex] = 1.301 g/cm³

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The average college student uses 320 pounds of paper per year. How many

ounces of paper does an average college student use per day?

1 pound = 16 ounces 1 year= 365 days

*

Based on the **conversion facto**r, the number of **ounces** of paper an average college student uses per day is 14 ounces of paper per day

A** conversion factor** is a value that is used to make the conversion from one unit of measurement to another.

The conversion factor from **pounds** to **ounces** is given below as follows:

1 pound = 16 ounces

Also, the conversion factor from years to days is given below as follows:

1 year = 365 days

Hence, the **ounces** of paper an average college student uses per day are calculated as follows;

320 pounds = 320 * 16 ounces

320 pounds = 5120 ounces

Ounces of paper per day = 5120 / 365

**Ounces** of paper per day = 14 ounces per day

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Which of the following correctly explains why an object floats on water?(1 point)

Responses

An object that has less mass in the same amount of volume, is supported by the water underneath it.

An object that has less mass in the same amount of volume, is supported by the water underneath it.

An object that has less volume in the same amount of mass, is supported by the water underneath.

An object that has less volume in the same amount of mass, is supported by the water underneath.

An object that has less tightly packed atoms than water is not supported by the water underneath it.

An object that has less tightly packed atoms than water is not supported by the water underneath it.

An object that has more tightly packed atoms than water is supported by the water underneath it.

Answer choice #3

This question deals with density. Answer choice #3 explains density.

This question deals with density. Answer choice #3 explains density.

HELP PLEASE RIGHT ANSWERS ONLY. A legend is a traditional story that explains something in real life. Sometimes they are accepted as true, but sometimes they are fantastical and just plain fun. There are many legends that surround the North Star explaining its creation as well as why it is stationary.

Take some time to research some of the legends of the North Star. After you have had a chance to read several of them, create your own fantastical story of the North Star. It can be how it came to be or explain why it is stationary.

The North **star** is stationary because it helped as a **reference** point in describing the **location** of a place in Bethlehem.

This is a **celestial** body which is characterized by the presence of **gases** which are mostly hydrogen and helium and are held together by its own **gravity**.

The origin of the North **star** was in the creation of the stars by God in which a small dot was left. This resulted in the dot wanting to be like other stars. The wish was the later granted and it was the **Star** of Bethlehem which was stationary and helped in the precise **location** of the place.

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A 0.325g of KHP required 20.15ml of NaOH for neutralization. Calculate the molarity of NaOH

The **molarity** of **NaOH** solution that required 20.15mL is 0.0004032M.

**Molarity** is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

**Molarity** of a solution can be calculated by dividing the number of moles in the solution by the volume as follows:

**Molarity** = no of moles ÷ volume

According to this question, 0.325g of KHP required 20.15ml of **NaOH** for neutralization. The number of moles in this mass can be calculated as follows:

no of moles = 0.325g ÷ 40g/mol

no of moles = 0.008125mol

**Molarity** = 0.008125mol ÷ 20.15mL

**Molarity** = 0.0004032M

Therefore, 0.0004032M is the **molarity** of the solution.

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how do i calculate the mass of the product of this equation : 2Fe+3Cl2-->2FeCl3, given that I have 5 grams of Chlorine

To calculate the mass of the product FeCl₃, we will need to do the following steps:

1 - Calculate the molar masses of Cl₂ and FeCl₃.

2 - Calculate the number of moles of Cl₂ in 5g of it.

3 - Calculate the number of moles of FeCl₃ given the stoichiometry of the reaction.

4 - Calculate the mass of FeCl₃ for the calculatd number of moles.

(we will use *M* for molar mass, *m* for mass and *n* for number of moles)

1 - The molar masses can be calculated using the molar masses of the elements in each compound:

[tex]\begin{gathered} M_{Cl_2}=2\cdot M_{Cl} \\ M_{Cl_2}=2\cdot35.453g\/mol \\ M_{Cl_2}=70.906g\/mol \end{gathered}[/tex][tex]\begin{gathered} M_{FeCl_3}=1\cdot M_{Fe}+3\cdot M_{Cl} \\ M_{FeCl_3}=(1\cdot55.845+3\cdot35.453)g\/mol \\ M_{FeCl_3}=162.204g\/mol \end{gathered}[/tex]2 - Now, we need to calculate the number of moles of Cl₂, so we will use the molar mass of Cl₂.

So, for the number of moles of Cl₂, we have:

[tex]\begin{gathered} M_{Cl_{2}}=\frac{m_{Cl_2}}{n_{Cl_{2}}} \\ n_{Cl_2}=\frac{m_{Cl_2}}{M_{Cl_{2}}}=\frac{5g}{70.906g\/mol}=0.070515\ldots mol \end{gathered}[/tex]3 - Now, we need to apply the stoichimetry. We can use rule of three for this.

From the balanced equation, we see that for each 3 Cl₂ that react, we will produce 2 FeCl₃.

So, we know that we actually have 0.070515...mol of Cl₂, so we use the rule of three to see how many moles we will produce of FeCl₃:

FeCl₃ --- Cl₂

2 --- 3

n --- 0.070515...mol

So, we have the equation:

[tex]\begin{gathered} \frac{2}{n}=\frac{3}{0.070515\ldots mol} \\ 2\cdot0.070515\ldots mol=3n \\ 0.141031\ldots mol=3n \\ 3n=0.141031\ldots mol \\ n=\frac{0.141031\ldots mol}{3} \\ n=0.047010\ldots mol \end{gathered}[/tex]And this is the number of moles of FeCl₃, so we can indicate this with the subscript:

[tex]n_{FeCl_3}=0.047010\ldots mol[/tex]4 - Finally, we will use now the molar mass of FeCl₃ to calculate the mass of 0.047010...mol of FeCl₃. The equation is the same as we used for Cl₂, but we will find the mass instead of the number of moles:

[tex]\begin{gathered} M_{FeCl_3}=\frac{m_{FeCl_3}}{n_{FeCl_{3}}} \\ m_{FeCl_3}=n_{FeCl_3}\cdot M_{FeCl_3}=0.041010\ldots mol\cdot162.204g\/mol=7.6253\ldots g \end{gathered}[/tex]So, the mass is 7.6253...g, but since we started with the mass of 5g, we have only one significant figure, so if we strickly consider the number of significant figures, we need to end up with only one, so:

[tex]m_{FeCl_3}\approx8g[/tex]So, **the mass that we will produce if all the 5 grams react is 7.6253...g or, approximately 8g**.

I NEED HELP! WILL MARK BRAINLIEST!

Isotopes of certain ___ elements that spontaneously emit ___ and ___ from the ____.

Isotopes of certain **radioactive** elements that spontaneously emit **radiation** and **rays** from the **nuclei**.

**Isotopes** can be artificially created by **bombarding **a stable nucleus with charged particles using accelerators or nucleons in a **nuclear** reactor, or they can be created normally through the nuclear reactions of a nucleus (i.e., emission of energy in the form of of **alpha **particles, **beta** particles, neutrons, and photons).

Soddy at the Glasgow University at his lab. The idea of **isotopes**—that **elements** could have more least 1 atomic weight—was first forth by English radiochemist **Frederick Soddy** in a public letter that appeared in the Dec. 4, 1913, issue of Nature. His formula won him the 1921 Nobel Prize in Chemistry.

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iven the following reactions,

Fe2O3 (s) + 3CO (s) 2Fe (s) + 3CO2 (g) H = -28.0 kJ

3Fe (s) + 4CO2 (s) 4CO (g) + Fe3O4 (s) H = +12.5 kJ

the enthalpy of the reaction of Fe2O3 with CO (below) is _____________ kJ.

3Fe2O3 (s) + CO (g) CO2 (g) + 2Fe3O4 (s)

**Enthalpy of reaction** when CO(s) reacts with Fe₂O₃(s) is +15.5KJ.

First let us write all the **reactions**,

Fe₂O₃(s) + 3CO(s) → 2Fe(s) + 3CO₂(g); ΔH₁ = -28.0 kJ, Equation 1,

3Fe(s) + 4CO₂(s) → 4CO(g) + Fe₃O₄(s) ; ΔH₂ = +12.5 kJ, Equation 2,

**Enthalpy of reaction **of CO(s) and Fe₃O₄(s) can be found by,

Adding the two given equation,

Fe₂O₃(s) + 3CO(s) + 3Fe(s) + 4CO₂(s) → 2Fe(s) + 3CO₂(g) + 4CO(g) + Fe₃O₄(s)

Further solving,

Fe₂O₃(s) + Fe(s) + CO₂(s) → CO(s) + Fe₃O₄(s); ΔH = ΔH₁+ΔH₂

Now, reversing the equation,

CO(s) + Fe₃O₄(s) → Fe₂O₃(s) + Fe(s) + CO₂(s); ΔH = -(ΔH₁+ΔH₂)

On **reversing **a reaction the sign of the Enthalpy changes,

So, the enthalpy,

** ΔH = -(ΔH₁+ΔH₂)**

ΔH = -(-28+12.5)KJ

ΔH = 15.5 KJ.

Hence the **enthalpy of reaction** is 15.5KJ.

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Below is the word equation for the reaction between sodium hydroxide and hydrochloric acid. Identify the reactant(s) in the reaction. Sodium hydroxide + Hydrochloric acid → Sodium chloride + Water

I a chemical reaction, we have the reactants in the left part,followed by an arrow and then the products.

So, the reactants are the two that are in the left part of the equation:

**Sodium hydroxide and Hydrochloric acid**

What is made of two or more substances that are together in the same place but are not chemically combined

When two or more **substances **are together in the same place but are **not chemically **combined they form a **mixture**.

The word **mixture **is used in chemistry to denote a combination of two or more elements that conserve their **original properties,** which is fundamental to achieving the separation of such elements in the future.

Therefore, with this data, we can see that a mixture is a mix or combination of two or more elements that still **conserve **their physical and chemical properties, thereby allowing their separation through different techniques.

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Methanol has a density of 0.792 g/mL. What is the volume of 0.5 moles of methanol?

Density=0.792g/ml

Volume=?

We know, **Density **= **Mass/volume**

Moles=0.5

To calculate mass, no of moles = given mass/ molar mass

Molar mass of methanol= 32

On calculating, given mass= 0.5*32 = 16g

**Volume** of methanol = **Mass**/**Density**

** **=16/0.792

=**20.202 ml**

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A 300K gas at 1.5 atm is pressurized to 2.25 atm. What is its resulting temperature in K?

**Step 1 **- Understanding the relation between temperature and pressure

There are three main variables that can modify the state of a gas: pressure (**P**), volume (**V**) and temperature (**T**). When one of them is** kept constant**, **linear **relationships arise between the remaining two.

So when we keep the volume constant (**isovolumetric** transformation), the **pressure** and the **temperature** become** directly** proportional, i.e., the **greater** the **temperature**, the **greater** the **pressure** and vice-versa.

We can state it mathematically as:

[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]Step 2 - Using the equation to solve the question

Ammonium nitrate (NH4NO3), a common fertilizer, is 35.0% nitrogen by mass. How much ammonium nitrate contains 1.25 kg of nitrogen?

The amount of **ammonium nitrate **contains 1.25 kg of **nitrogen **is 3571.42 gm

**Percent composition** tells you with the aid of mass what percent of each detail is found in a compound. A chemical compound is a mixture of or greater factors. in case you are analyzing a chemical compound, you may want to find the percentage composition of a sure detail within that chemical **compound**.

The** percentage composition **is the percentage through **the mass **of each detail in a compound.

The **molar mass **of **ammonium nitrate** (NH₄NO₃) = 14 + 4 + 14 + 48 = 80 g.

**percentage composition** of **Nitrogen **= 35%

Percentage composition of Hydrogen = 5%

Percentage composition of **Oxygen **= 60%

35% of 80 g ammonium nitrate (NH₄NO₃) = 80 × 35/100

= 28 g.

∵ 28 grams of nitrogen contained in = 80 grams of ammonium nitrate (NH₄NO₃)

1250 g of nitrogen contained in = (80/28) × 1250 grams of ammonium nitrate (NH₄NO₃)

= 3571.42 g of ammonium nitrate (NH₄NO₃)

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For the reaction CH4 + 202-> CO₂ + 2H₂O, how many moles of water are produced alongside 100g of carbon dioxide.

**ANSWER**

The number of moles of water produced is **4.54 moles**

**EXPLANATION**

Given that:

[tex]\text{ CH}_4\text{ }+2O_2\text{ }\rightarrow\text{ CO}_2\text{ }+\text{ 2H}_2O[/tex]The mass of carbon dioxide is **100g**

To find the moles of water, follow the steps below

Step 1: Calculate the moles of carbon dioxide using the formula below

[tex]\text{ Mole }=\text{ }\frac{\text{ mass}}{molar\text{ mass}}[/tex]Recall, that the molar mass of CO2 is 44.01 g/ mol

Step 2: Substitute the given data into the formula in step 1

[tex]\begin{gathered} \text{ mole }=\text{ }\frac{100}{44.01} \\ \text{ mole }=2.272\text{ moles} \end{gathered}[/tex]Step 3: Find the moles of water produced using **a stoichiometry ratio**

In the reaction above, 1 mole of CO2 is equivalent to 2 moles of H2O

Let x represent the number of moles of water

[tex]\begin{gathered} \text{ 1 mole CO}_2\text{ }\rightarrow\text{ 2 moles H}_2O \\ \text{ 2.272 moles CO}_2\text{ }\rightarrow\text{ x moles H}_2O \\ \text{ Cross multiply} \\ \text{ 1 mole CO}_2\text{ }\times\text{ x moles H}_2O\text{ }=\text{ 2 moles H}_2O\times2.272\text{ moles CO}_2 \\ \text{ Isolate x} \\ \text{ x }=\frac{2\text{ moles H}_2O\times2.272\cancel{molesCO_2}}{1\cancel{moleCO_2}} \\ \text{ x }=\text{ 2 }\times\text{ 2.272} \\ \text{ x }=\text{ 4.54 moles} \end{gathered}[/tex]Therefore, the number of moles of water produced is **4.54 moles**

What is a scanning tunneling microscope?An instrument used to view cells and bacteria.An instrument used to view viruses.An instrument used for imaging surfaces at the atomic level.An instrument used to view quarks.

Explanation:

A scanning tunneling microscope is a type of microscope widely used both in industrial and fundamental research to obtain atomic scaled images. It is basically used for imagaing surfaces at the atomic level.

Answer:

**The third option is correct.**

Consider the chemical reaction that takes place between aqueous iron(III)

nitrate and aqueous sodium hydroxide.

Complete the balanced molecular chemical equation for the reaction below.

If no reaction occurs, write NR after the reaction arrow. Be sure to include

the proper phases for all species within the reaction.

Fe(NO3)³(aq) + NaOH(ag) →|

**Answer:**

[tex]Fe(NO_3)_3 (aq) + 3 NaOH (aq) = > Fe(OH)_3 (s) + 3NaNO_3 (aq)[/tex]

The oxidation state of the iron does not change and this is a double displacement reaction. Fe(OH)3 may decompose further into some oxyhydroxides but the equation provided is probably what the questioner is asking for

Can I know the answer ？

According to the given statement **Mass **of one **atom** of **gold** in grams is **196.78 g.**

A chemical element is uniquely defined by its **atoms**, that are small bits of substance. An **atom** is made up of a core nucleus one and or more negatively charged **electrons** that orbit it. The positively charged, relatively hefty protons and **neutrons **that make it up the nucleus may be present.

Up until the 1800s, this idea of tiny, indivisible pieces of matter remained. The contemporary **atomic** idea was really started by the eminent chemist **John** **Dalton** (1766–1844). But his atom was like a rock-solid ball.

Molar mass is the weight in grams of one mole of an **atom**.

1 mole = 6.022×10²³ **atoms**

Molar mass of Gold (Au)

= mass of an atom × number of atoms

=3.207×10-²²×6.022×10²³

=**196.78g.**

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How many possible combinations are there for the values of l and ml when n = 3?

There are **three **possible values for the l and there are **nine **possible values for ml.

The term** quantum numbers** has to do with the description that shows the most probable position of the electron in an atom. We know that the orbital is a region in space, where there is a high probability of finding the electrons.

Given that the values of l must be in the range of** 0 to n - l** and the values of ml must be in the rang of** -l to + l.** we then can use this to know the number of the possible combinations of l and ml when n = 3.

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based on research, would you consider natural gas a clean source of energy?

**Answer:**

**Explanation:**

Here, we want to consider if natural gas is a clean energy source

A clean energy source is one with zero environmental pollution effects

At present, it is quite impossible for natural gas plant not not release heat-trapping gases into the atmosphere. Although this can be largely reduced as we can see in new generation plants. However,this does not move us from the point that natural gas is itself not a clean energy source due to its by-product from usage.

Hence, our answer here is** NO, natural gas is not a clean **source of energy

Natural gas is not clean.

the number of mole of iron produced from 0.216 mole of aluminum is:

3 FeO (l) + 2 Al (l) → 3 Fe (l) + 1 Al2O3

0.324 moles of Iron is produced from 0.216 moles of Aluminum.

the relative density of lead is 11. Calculate it's density.

Under the given conditions, the **density** **of lead **is 11000 kg/m∧3.

**What is relative density?**

The proportion of a substance's **density** to that of reference material under particular circumstances is called **relative density**. The standard measure for liquids and solids is often water at 4°C or another predetermined temperature. An ice cube, for instance, has a** relative density **of 0.91 and will float. A substance will sink if its relative density is greater than 1. Both the reference and the sample must have a specific** temperature** and **pressure**.

Let the **Relative density **of lead be R

The** density of water** is ρw

We know,

**Relative density** R = 11

**Density of water** = 1000 kg/m∧3

**Density of lead** = 11 × ρwater = 11 × 1000 kg/m∧3 = 11000 kg/m∧3

Hence, the **density of lead** is 11000 kg/m∧3.

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****

****

** **

**Density of water, ρ **

**water**

****

** =1000 kg/m **

**3**

** =1 g/cm **

**3**

** **

**⟹ρ **

**lead**

****

** =11.3×ρ **

**water**

****

** **

**ρ **

**lead**

****

** (in g/cm **

**3**

** )=11.3×1**

**ρ **

**lead**

****

** (in g/cm **

**3**

** )=11.3 g/cm **

**3**

** **

**And,**

**ρ **

**lead**

****

** (in kg/m **

**3**

** )=11.3×1000**

**ρ **

**lead**

****

** (in kg/m **

**3**

** )=11300 kg/m **

**3**

how many moles of HCL are required to prepare 0.80L of a 0.5M HCL solution

**Answer:**

**Explanation:**

Here, we want to get the number of moles

Mathematically:

[tex]Number\text{ of moles = molarity }\times\text{ volume}[/tex]We have that as:

[tex]Number\text{ of moles = 0.5 }\times\text{ 0.8 = 0.4 mol}[/tex]If the specific heat of methanol is 2.44 J/k -g how many joules are necessary to raise the temperature of 40g of methanol from 50⁰c to 60⁰c?

**Explanation:**

[tex]q = mc(t2 - t1)[/tex]

[tex]q = 40 \times 2.44 \times (60 - 50)[/tex]

[tex]q = 976 \: joules[/tex]

distinguish between kinetic energy and potential energy

**Potential energy** is stored energy in an object. Potential energy is the product of mass of an object, acceleration due to gravity and height of an object where it is placed.

Potential energy = mgh

m = mass of an object

g = acceleration due to gravity

h = height of an object

The S.I. unit of potential energy is **joule **and is represented by J.

**Kinetic energy** is energy of an object due to its movement. Kinetic energy is the product of mass of an object and velocity of an object shown by :-

Kinetic energy = 1/2 mv²

m = mass of an object

v = velocity of an object

The S.I. unit of kinetic energy is **joule **and is represented by J.

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50 POINTS!!! GOOD AND EXPERT ANSWER ONLY!!! DONT WRITE FAKE ANSWERS FOR POINTS OTHERWISE THEY WILL BE DELETED!!!

The cathode ray experiment indicated the existence of negatively charged particles in an atom. This experiment also disproved the part of Dalton's atomic model that claimed indivisibility of the atom. When the experiment was repeated using cathodes made of a different metal, each time the results were consistent. These discoveries of Thompson were later substantiated by Robert Millikan when he calculated the charge on an electron.

Use information from the passage to justify whether the characteristics of reliable scientific explanations are present in the development of the atomic theory.

The characteristics of** scientific explanation** are included in the development of the** atomic theory**.

The development of a **scientific idea **always follows the **scientific method**. The scientific method includes the proposition of a **hypothesis, **the confirmation or disapproval of the initial hypothesis, and experimentation.

**Dalton's** primary ideas were laid aside as stronger empirical evidence developed.** J.J. Thomson's** experiment has given the** atomic mode**l while the **nucleus** and **electron** were discovered by the experiments of **Rutherford**, Geiger, and Ernest Marsden.

Since there was **experimentation** at certain points to confirm or disprove the propositions, therefore, there was a deep involvement of the **scientific method** in the development of the **atomic theory**.

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