I need some help please

Hey there!

A mole is measured in atoms, molecules, particles. It's kind of a loose sort of measurement, just unit of the substance.

Since there is a ratio of 1 to 1 nitrogen to oxygen, there will be the same amount of molecules as atoms of nitrogen.

2.25 moles of NO gas are formed from 2.25 moles of nitrogen.

Hope this helps!

Answer:

Rain,accompanied by cooler weather

Answer:

Rain and cooler weather

Explanation:

Answer:

1. The colors changes mean the reaction took place.

2. Fe and CuSO4

3. FeSO4 and Cu

4. This means that the electrons on both the reactants and the products have to be balance or need to be the same.

5. When you get the products meaning after the reaction takes place

The color change from blue to colorless indicates copper ions are being reduced to metallic copper in a chemical reaction, where iron and copper(II) sulfate are reactants, and iron(II) sulfate and copper are products. A balanced chemical equation has equal numbers of each type of atom on both sides, and reaction rate can be measured by changes in reactant/product concentration over time.

The color changes indicate a chemical reaction is taking place. Specifically, the disappearance of the blue color suggests the reduction of copper ions (Cu2+) to metallic copper (Cu) and their removal from the solution.

The reactants in this reaction are iron (Fe) and copper(II) sulfate (CuSO4).

The products are iron(II) sulfate (FeSO4) and copper (Cu).

A balanced chemical equation means that the number of atoms for each element is the same on both sides of the equation. This follows the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction.

To determine the rate of a chemical reaction, one approach is to measure the change in concentration of a reactant or product over time. For example, for the reaction Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s), you might measure how quickly the blue color of CuSO4 fades or how quickly metallic copper forms on the iron nail.

Answer:

38.75KPa

Explanation:

The following were obtained from the question:

V1 = 155cm^3

P1 = 22.5kPa

V2 = 90cm^3

P2 =?

The new pressure can obtain by doing the following:

P1V1 = P2V2

22.5 x 155 = P2 x 90

Divide both side by 90

P2 = (22.5 x 155) /90

P2 = 38.75KPa

Answer:

Solid -> Gas

Explanation:

Sublimation is when a solid directly transitions to a gas, skipping the liquid form.

Explanation:

sublimation is a changing of a solid directly into vapour on heating and of vapour into solid on cooling .

hope it helps

Answer:

The answer is 20 % V/V

Explanation:

We use this formula for calculate the %V/V:

%V/V= (ml solute/ml solution) x 100= (75ml/375 ml)x 100 = 20 % V/V

The% V / V represents the amount of ml of solute dissolved in 100 ml of solution

Answer:

To react with 0.5 moles of Zn 1 mole of HCl is required

Explanation:

Given data:

Number of moles of Zn = 0.50 mol

Number of moles of HCl = ?

Chemical equation:

Zn + 2HCl  → H₂ + ZnCl₂

Now we will compare the moles of Zn and HCl through balance chemical equation.

                       Zn         :        HCl

                         1          :            2

                       0.50      :         2×0.5 = 1 mol

In order to react with 0.5 moles of zinc 1 mole of HCl is required.

Final answer:

To react with 0.50 moles of Zn, following a 1:2 molar ratio based on the provided equation, 1.0 mole of HCl is required.

Explanation:

The question you've asked is about how many moles of hydrochloric acid (HCl) are needed to react with 0.50 moles of zinc (Zn), based on the chemical equation: Zn + 2HCl → H2 + ZnCl2. From this equation, it's clear that zinc reacts with hydrochloric acid in a 1:2 molar ratio, meaning that for each mole of zinc, two moles of HCl are required for the reaction to proceed to completion.

Therefore, to react with 0.50 moles of Zn, you need 2 * 0.50 = 1.0 mole of HCl.

Answer:

The final temperature of the water mixture is 47.85°C

Explanation :

Given,

For Warm Water

mass = 10grams

Temperature = 105°C

For Cold Water

mass = 25grams

Temperature = 25°C

When a sample of warm water is mixed with a sample of cool water,

The energy amount going out of the warm water is equal to the energy amount going into the cool water. This means:

However,

Q = (mass) (ΔT) (Cp)

Cp = Specific heat of water = 4.184 J/Kg°C

So,

(mass) (ΔT) (Cp) = (mass) (ΔT) (Cp)

We start by calling the final, ending temperature 'x.' Keep in mind that BOTH water samples will wind up at the temperature we are calling 'x.' Also, make sure you understand that the 'x' we are using is FINAL temperature. This is what we are solving for.  

The warmer water goes down from to 105°C to x, so this means its Δt equals 105°C − x. The colder water goes up in temperature, so its Δt equals x − 25℃

Substituting the values,

(10)( 105°C − x)(4.184) = (25)(x − 25℃)(4.184)

Solving for x, we get

x = 47.85°C

Therefore, The final temperature of the water mixture is 47.85°C.

Answer:

Explanation:

Combustion of methane gas molecules in abundance of O2 can follow the above reaction, product expected carbon dioxide, water and energy only.

 But, when the O2 is not sufficiently available for perfect methane combustion, then there are many other products from the methane combustion reaction in above the product with CO and C.  

 The molar ratio of [C]: [CO] :[CO2] will depend on the availability of O2 for combustion of methane . In the high deficiency of oxygen conditions:  monoxide and black carbon will be the major products of the combustion of methane.

Answer:

IT BREAKS AT RANDOM PLACES!!!!

An amorphous soild breaks at the random places

Amorphous solid, any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel.

These solids are stabilized by the regular pattern of their atoms. Their characteristic properties include distinct melting and boiling points, regular geometric shapes, and flat faces when cleaved or sheared.

Learn more about Amorphous Solid here

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Answer:

b

Explanation:

hi from 2022

Ben and Sam were conducting experiments on physical and chemical changes in science class. Sam is correct. It is a chemical change and the contents should be in D. for compound. Therefore, option B is correct.

In a physical change the visual aspect or form of the matter changes but the kind of matter in the substance does not. However, in a chemical change, the kind of matter changes and at least one new matter with new properties is produced.

Some of the processes that makes physical changes include cutting, bending, dissolving, freezing, boiling, and melting.

Examples of chemical changes are baking soda and vinegar creating carbon dioxide, iron rusting, and wood burning.

Thus, Sam is correct. It is a chemical change and the contents should be in D. for compound, option B is correct.

To learn more about the chemical and physical change, follow the link;

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Answer:

moles, liter, concentration, and 6.0 mol/L

Explanation:

Answer:

First Question:

Moles, liter, concentration, 6.0 mol/L

Second Question:

C. [HCl]

Third Question:

C. molarity.

Fourth Question:

A. M = mol solute/liter solution

Explanation:

Got it right

Answer:

more than 300 N

Explanation:

you have to have more than 300 N of force to move an object that already requires 300 so 301 N would push it but very slowly

Answer: Check explanation

Explanation:

Then bike can't get hit.  They can turn the wheel. They can hit the brake

Answer:

Modern scientists base their classifications mainly on molecular similarities. They group together organisms that have similar proteins and DNA. Molecular similarities show that organisms are related. In other words, they are descendants of a common ancestor in the past.

Explanation:

Answer: Mercury (Hg)

Atomic no.= 80

Electronic Configuration= 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^14 5d^10. The shortened form of the electronic configuration is: [Xe] 4f14 5d10 6s2.

I hope that this helps you !

Answer:2) NaCl

Explanation:

The least soluble substance at 50°C would be the one with the lowest point on a typical solubility graph at this temperature. However, a specific answer cannot be provided without the graph.

Without the graph, it's not possible to provide a definitive answer. In general, solubility depends on the specific substance and temperature. However, assuming a typical solubility graph, you would find the least soluble substance at 50°C by looking for the compound which has the lowest point on the graph at this temperature. This is because solubility graphs usually show the amount of a substance that can be dissolved in 100 grams of water at various temperatures.

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Explanation:

Balancing equation

Explanation:

In the given reaction, sodium is reacting with chlorine to produce sodium chloride

The chemical equation involved is

Na+Cl_2\rightarrow NaClNa+Cl2→NaCl

When the number of atoms for the reactant side is calculated it gives:

Na = 1

Cl = 2

When the number of atoms for the product side is calculated it gives:

Na = 1

Cl = 1

The obtained result indicates that the Chlorine atom is not equal on both sides. Thus the reaction is not balanced.

The balanced reaction has the number of atoms involved in reaction in reactants as well as the product is equal.

To make both side equal some changes must be made as shown in the balanced equation is

2Na+Cl_2\rightarrow 2NaCl2Na+Cl2→2NaCl

For the above equation, the number of atoms in the reactants is:

Na= 2

Cl = 2

The number of atoms in products is:

Na = 2

Cl = 2

As the number of atoms in the reactants side is equal to the number of atoms in the product side, the reaction is balanced.

Hey there!

H₂O₂ → H₂ + O₂

This equation is already balanced.

We count 2 hydrogen atoms on the left, and 2 hydrogen atoms on the right.

We count 2 oxygen atoms on the left, and 2 oxygen atoms on the right.

This means the equation is balanced.

Hope this helps!

Answer:

B

Explanation:

Answer:

B

Explanation:

Answer: D.) melting ice

Explanation:

An exothermic reaction is a chemical reaction that releases energy through light or heat

hope this helps :D

Answer:

% yield = 62.21 %

Explanation:

∴ mass C2H4(g) = 4.6 g

∴ mass C2H6O(l) = 4.7 g

theretical yield:

∴ molar mass C2H4(g) = 28.05 g/mol

⇒ mol C2H4(g) = (4.6 g)*(mol/28.05 g) = 0.164 mol

⇒ mol C2H6O(l) = (0.164 mol C2H4)*(mol C2H6O(l)/molC2H4(g))

⇒ mol C2H6O(l) = 0.164 mol

∴ molar mass C2H6O(l) = 46.07 g/mol

⇒ mass C2H6O(l) = (0.164 mol)*(46.07 g/mol) = 7.55 g

⇒ theoretical yield = 7.55 g

⇒ % yield = (4.7 g)/(7.55 g))*100

⇒ % yield = 62.21 %

The percent yield of the reaction is 62.7%.

The percent yield of a chemical reaction is the ratio of the actual yield to the theoretical yield, multiplied by 100. To calculate the percent yield, you need to determine the theoretical yield and the actual yield. The theoretical yield is the maximum amount of product that can be obtained based on stoichiometry, while the actual yield is the amount of product obtained in the reaction. In this case, you are given that 4.6 g of ethylene produces 4.7 g of ethyl alcohol. To find the percent yield, divide the actual yield by the theoretical yield and multiply by 100.

First, determine the moles of ethylene and ethyl alcohol. The molar mass of ethylene (C2H4) is 28 g/mol, and the molar mass of ethyl alcohol (C2H6O) is 46 g/mol.

Moles of ethylene = mass / molar mass = 4.6 g / 28 g/mol = 0.164 mol

Moles of ethyl alcohol = mass / molar mass = 4.7 g / 46 g/mol = 0.102 mol

The molar ratio between ethylene and ethyl alcohol is 1:1, meaning that 1 mol of ethylene produces 1 mol of ethyl alcohol.

Since the moles of ethylene and ethyl alcohol are equal, the theoretical yield of ethyl alcohol is 0.164 mol. Convert this to grams using the molar mass: theoretical yield = 0.164 mol * 46 g/mol = 7.5 g.

Finally, calculate the percent yield:

Percent yield = (actual yield / theoretical yield) * 100

Percent yield = (4.7 g / 7.5 g) * 100 = 62.7%

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Answer:

electrons

Explanation:

metals do what is called metallic bond

An electron is the particles are free to drift in metals.

The elements having tendency to lose electron and having properties like lustrous, malleable, ductile, opaque, denser and good conductor of heat and electricity is called metals

To learn more about drift in metals here.

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To find the total heat absorbed by 65.0 grams of water when its temperature increases from 25°C to 40°C, use the formula: Q = mcΔT.

The total number of Joules of heat absorbed by 65.0 grams of water can be calculated using the formula:
Q = mcΔT, where m is the mass of water, c is the specific heat capacity of water, and ΔT is the temperature change.
In this case, you can use the specific heat capacity of water (4.184 J/g°C) to find the heat absorbed.

1.34 moles are in 135g of Teflon.

Explanation:

Molecular formula of teflon is (C2H4)n

mass of teflon = 135 grams

atomic mass of teflon = 100.01 gram/mole

number of moles of teflon = ?

Formula used to calculate number of moles in a substance is given as:

number of moles = [tex]\frac{mass}{atomic mass of 1 mole}[/tex]

putting the values in the above equation:

number of moles = [tex]\frac{135}{100.01}[/tex]

number of moles = 1.34 moles

Teflon is polymer which is used for making non-stick coating, in 135 grams of teflon there are 1.34 moles in it.

Using the formula for calculating moles (mass/molar mass), we find that there are roughly 0.27 moles in 135g of Teflon.

To calculate the number of moles in a given mass of a substance, we use the formula:
Number of moles = Mass (in grams) / Molar Mass (in g/mol).
Teflon is also known as polytetrafluoroethylene (PTFE), and its molar mass is roughly 500 g/mol. So, to find the number of moles in 135g of Teflon, we divide:
Number of moles = 135 g / 500 g/mol = 0.27 moles.
Therefore, there are around 0.27 moles of Teflon in a 135g sample.

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The rest of the wood was burned into gases of equivalent weight.

Explanation:

The rest of the wood was burned into gases of equivalent weight.

Water's chemical properties remain the same as it changes states from vapor to liquid to ice because it retains its molecular structure of two hydrogen atoms bonded to an oxygen atom (H₂O) throughout the transformations.

As water changes states from water vapor to liquid water, and then to ice, what remains consistent is (A) its chemical properties. This is because, in each state, water is still composed of Hydrogen and Oxygen atoms in a 2:1 ratio, represented as H₂O. Even though its physical properties like density, temperature, and appearance change, the fundamental molecular structure remains the same.

For instance, consider liquid water freezing into ice. Though the physical arrangement of the water molecules changes (which accounts for ice's unique property of being less dense than the liquid water), the water molecules themselves remain unchanged. Each water molecule is still composed of two hydrogen atoms bonded to an oxygen atom.

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Answer:

The number of electrons in the outer energy level of oxygen is 6.

Explanation:

Oxygen is present in the group 16 of the periodic table. The electronic configuration of group 16 element is [tex]ns^{2}np^{4}[/tex]. The number of electrons in outer energy level of group 16 element is always found to be 6.

The addition of the number of the electrons present in the valence shell orbitals of oxygen will give the total number of electrons present in the outer energy level.

The number of electron in the outer energy level of oxygen is (2 + 4) = 6.