Identify the following substances:
(1) An acidic gas which gives dense white fumes with NH3
(11 An alkane which can also be called a green house gas.
(iii) A solid which when kept in the open, forms a solution after som
(iv) An alloy used in electrical fittings.
(v) A metal which gives hydrogen gas on reacting with both dilute a
Write equations for the following reactions:
Aluminium oxide and Sodium hydroxide.
(ii) Zine and dilute sulphuric acid.
(
11​

The volume of \(N_2O_5\) needed to produce 9.64 L of \(NO_2\) is 4.97 L, calculated using stoichiometry and the ideal gas equation.

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Answer: One methane molecule, CH4, contains one carbon atom and four hydrogen atoms.

Explanation:

sorry needed the points

Answer:

39.6 mL

Explanation:

Step 1: Write the balanced neutralization reaction

Ba(OH)₂(aq) + 2 CH₃COOH(aq) ⟶ Ba(CH₃COO)₂(aq) + 2 H₂O(l)

Step 2: Calculate the moles corresponding to 2.78 g of CH₃COOH

The molar mass of CH₃COOH is 60.05 g/mol.

2.78 g × 1 mol/60.05 g = 0.0463 mol

Step 3: Calculate the moles of Ba(OH)₂ needed to react with 0.0463 moles of CH₃COOH

The molar ratio of Ba(OH)₂ to CH₃COOH is 1:2. The moles of Ba(OH)₂ needed are 1/2 × 0.0463 mol = 0.0232 mol.

Step 4: Calculate the volume of 0.586 M solution that contains 0.0232 moles of Ba(OH)₂

0.0232 mol × 1 L/0.586 mol = 0.0396 L = 39.6 mL

• that the mass fraction of Na2CO3 = 2%

meaning 2 grams of Na2Co3 was dissolved in 98g of water .

∴ total mass of solution = 100g

• Density = 1.019g/mL.

• Molar mass Na2CO3=105,9888 g/mol

Density = mass /volume

∴Volume = mass/density = 100g /1.019g/mL.

= 90.66mL.

n = mass Na2CO3/MolMass Na2Co3

= 2 g /105.9888g/mol

∴moles of Na2CO3 =0.019moles Na2CO3

Molarity =( n/v) * 1000

= (0.019mol/(90.66/1000) L

= (0.019/90.66)*1000 ( multiply by 1000: 90.66/1000=0.09066)

=0.21M

Answer:  a) \(2H_2(g)+O_2(g)\rightarrow 2H_2O(g)\)

b) 4.00 L of \(H_2O\) will be produced

Explanation:

a) The balanced chemical reaction is:

\(2H_2(g)+O_2(g)\rightarrow 2H_2O(g)\)

b) According to avogadros law, equal moles of gases occupy equal volumes at same temperature and presure conditions.

According to stoichiometry :

2 L of \(H_2\) require  = 1 L of \(O_2\)

Thus 4.00 L of \(H_2\) will require=\(\frac{1}{2}\times 4.00=2.00L\)  of \(O_2\)

Thus \(H_2\) is the limiting reagent as it limits the formation of product and \(O_2\) is the excess reagent.

As 2 L of \(H_2\) give = 2 L of \(H_2O\)

Thus 4.00 L of \(H_2\) give =\(\frac{2}{2}\times 4.00=4.00L\)  of \(H_2O\)

Thus 4.00 L of \(H_2O\) will be produced

a. The balanced reaction for the process should be 2h_2(g) + O_2(g) ⇒2H_2O(g)

b. The number of liters of water vapor should be 4.00 liters of H_2O.

a. The balanced reaction for the process should be 2h_2(g) + O_2(g) ⇒2H_2O(g)

b. As per the law, the equal moles of gases occupied equal volumes at the similar temperature

So, the number of liters should be

= 2/2*4.00

= 4.00 of H_2O

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Answer:

omg that song l0wkey but high.key slaps

can you not please? this is an education website

So, the new pressure of the gas is approximately 0.759 atm.

To find the new pressure of the gas when the temperature is increased from 200 K to 376 K, we can use the ideal gas law:

P/T = nR/V

Now, we can plug in the initial pressure and temperature, and the new temperature, to find the new pressure:

P1/T1 = nR/V (initial conditions)

P2/T2 = nR/V (new conditions)

Where P1 = 1 atm, T1 = 200 K, and T2 = 376 K. Solving for P2, we get:

P2 = (P1 * T2) / T1

P2 = (1 atm * 376 K) / 200 K

Using the value of the universal gas constant, R = 8.31 J/mol*K, we can convert the units of pressure from atmospheres to pascals:

P2 = (1 atm * 101,325 Pa/atm * 376 K) / 200 K

P2 = (101,325 * 376) / 200

P2 = 75937.5 Pa

So, the new pressure of the gas is approximately 75,937.5 Pa or approximately 0.759 atm.

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The new pressure of the ideal gas would be 1.88 atm

According to Pressure law, the pressure of a gas is directly proportional to the temperature of the gas, provided that the volume of the gas is constant.

Mathematically: p1/t1 = p2/t2

In this case, p1 = 1 atm, t1 = 200 K, and t2 = 376 K

P2 = p1 x t2/t1 = 1x376/200

                       = 1.88 atm

In other words, the new pressure of the ideal gas would increase to 1.88 atm from 1 atm.

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Answer:

The first image = double replacement

Second = single replacement

Third = Decomposition

Fourth = Combination

Explanation:

1. a color from each pair is being swapped and replacing each other so there is a double replacement

2. only the blue and the red are changing places so it is single replacement

3. the pair is being separated (decomposed)

4. the red and green are coming together (combined)

The total mass of the balloon and its content is 1521.17 g, the number of moles of CO₂ in the balloon is 34.15 mol, and the number of CO₂ molecules in the balloon is 2.06 x 10²⁵ molecules.

a) The molar mass of CO₂ is 44.01 g/mol. To find the total mass of the balloon and its content, we need to add the mass of the balloon (20g) to the mass of the CO₂ inside the balloon.

Mass of CO₂ = number of moles of CO₂ x molar mass of CO₂

Since the balloon is at STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to find the number of moles of CO₂ in the balloon:

Volume of CO₂ = Volume of balloon = 765 L (at STP)

Number of moles of CO₂ = volume of CO₂ / molar volume of a gas at STP

                                          = 765 L / 22.4 L/mol

                                          = 34.15 mol

Mass of CO₂ = 34.15 mol x 44.01 g/mol

                       = 1501.17 g

Total mass of balloon and its content = 20 g + 1501.17 g

                                                               = 1521.17 g

b) Number of moles of CO₂ in the balloon is 34.15 mol

c) To find the number of CO₂ molecules in the balloon, we need to use Avogadro's number (6.02 x 10²³ molecules/mol).

Number of CO₂ molecules = number of moles of CO₂ x Avogadro's number

                                           = 34.15 mol x 6.02 x 10²³ molecules/mol

                                           = 2.06 x 10²⁵ molecules

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Answer:

may I help?............

Answer:

well i think coffe is an example cause it goes from hot to cold

Answer:

a. the conversion of nitric oxide into elemental nitrogen and oxygen gas.

Explanation:

Hello,

In this case, combustion at the automobiles' motors is not complete since gasoline usually has a considerable nitrogen oxides content (NOx) which is highly toxic when giving off from the cars. For that reason, recent advancements have shown platinum-rhodium-based catalytic converters have the capacity to catalyze the conversion of nitrogen oxides to elemental nitrogen and oxygen which are nontoxic. For that reason, answer is a. the conversion of nitric oxide into elemental nitrogen and oxygen gas.

Regards.

They appear as the trait over a recessive allele. Statement C) is true about the dominant alleles.

Dominant alleles are genetic variants that, when present in an individual's genotype, are expressed phenotypically, meaning they determine the visible or observable traits. Dominant alleles are represented by capital letters, while recessive alleles are represented by lowercase letters in genetics.

In terms of inheritance, if an individual has at least one copy of the dominant allele, it will be expressed in the phenotype, regardless of the presence of a recessive allele. This is because dominant alleles exert their influence over recessive alleles, thus "dominating" their expression.

To illustrate this, let's consider a specific example using a trait controlled by a single gene with two possible alleles: dominant (A) and recessive (a). If an individual is homozygous dominant (AA), meaning they possess two copies of the dominant allele, the dominant trait will be expressed.

However, if an individual is homozygous recessive (aa), with two copies of the recessive allele, the recessive trait will be expressed since there are no dominant alleles to override it.

Therefore, dominant alleles appear as the trait over recessive alleles, regardless of the presence or absence of a recessive allele. The presence of even a single copy of the dominant allele is sufficient for its expression in the phenotype. Option C

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Answer:

i think the answer should be a

There are approximately 6.022 × 10^23 atoms in 12 grams of Carbon-12 (12C).

The number of atoms in a given amount of a substance can be calculated using Avogadro's number, which represents the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 × 10^23.

Carbon-12 is a specific isotope of carbon, with an atomic mass of 12 atomic mass units (amu). One mole of Carbon-12 has a mass of 12 grams. Since one mole of any substance contains Avogadro's number of particles, in the case of Carbon-12, it contains 6.022 × 10^23 atoms.

Therefore, if we have 12 grams of Carbon-12, which is equal to one mole, we can conclude that there are approximately 6.022 × 10^23 atoms in this amount of Carbon-12.

In summary, 12 grams of Carbon-12 contains approximately 6.022 × 10^23 atoms. Avogadro's number allows us to relate the mass of a substance to the number of atoms or molecules it contains, providing a fundamental concept in chemistry and enabling us to quantify and understand the microscopic world of atoms and molecules.

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Answer:

They contain equal quantities of positively charged protons and negatively charged electrons

Explanation:

Atoms are electrically neutral because they contain equal quantities of positively charged protons and negatively charged electrons. Electrons and protons have equal but opposite charges, so the result is no net charge.

The balanced chemical equation for the reaction is:

PCl5 + H2O → H3PO4 + HCl

To balance this equation, we need to make sure that the number of atoms of each element is equal on both sides of the equation.

To do this, we can start by balancing the phosphorus (P) and chlorine (Cl) atoms. There is one P atom and five Cl atoms on the left side of the equation, and one P atom and one Cl atom on the right side of the equation. We can balance these by adding a coefficient of 5 in front of HCl:

PCl5 + H2O → H3PO4 + 5HCl

Now we have five Cl atoms on both sides of the equation. Next, we can balance the hydrogen (H) atoms. There are two H atoms on the left side of the equation and five H atoms on the right side of the equation. We can balance these by adding a coefficient of 2 in front of H2O:

PCl5 + 2H2O → H3PO4 + 5HCl

Now we have two H atoms on both sides of the equation. Finally, we can balance the oxygen (O) atoms. There are two O atoms on the left side of the equation and four O atoms on the right side of the equation. We can balance these by adding a coefficient of 2 in front of H3PO4:

PCl5 + 2H2O → 2H3PO4 + 5HCl

Therefore, to balance this reaction, we need to use this balanced chemical equation:

PCl5 + 2H2O → 2H3PO4 + 5HCl

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Xeriscaping is a landscaping approach that focuses on conserving water by using drought-tolerant plants and efficient irrigation techniques. The goal is to create a visually appealing and sustainable garden while minimizing water usage.

Successful xeriscaping projects involve several key elements. Firstly, careful plant selection is crucial, opting for species that can thrive in arid conditions without excessive watering. Mulching is used to reduce evaporation and retain soil moisture.

Proper soil preparation, such as improving drainage and adding organic matter, promotes healthier plant growth. Efficient irrigation systems, like drip irrigation or soaker hoses, deliver water directly to plant roots, minimizing wastage.

Additionally, controlling erosion through the use of retaining walls or terracing is important. Lastly, regular maintenance, including appropriate pruning and weed control, ensures the longevity and vitality of the xeriscape garden. Overall, a successful xeriscaping project harmonizes sustainable practices with a beautiful outdoor environment.

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Answer:

pH = 3.513

Explanation:

Hello there!

In this case, since this titration is carried out via the following neutralization reaction:

\(HONH_2+HCl\rightarrow HONH_3^+Cl^-\)

We can see the 1:1 mole ratio of the acid to the base and also to the resulting acidic salt as it comes from the strong HCl and the weak hydroxylamine. Thus, we first compute the required volume of HCl as shown below:

\(V_{HCl}=\frac{22.0mL*0.200M}{0.15M}=29.3mL\)

Now, we can see that the moles of acid, base and acidic salt are all:

\(0.0220L*0.200mol/L=0.0044mol\)

And therefore the concentration of the salt at the equivalence point is:

\([HONH_3^+Cl^-]=\frac{0.0044mol}{0.022L+0.0293L} =0.0858M\)

Next, for the calculation of the pH, we need to write the ionization of the weak part of the salt as it is able to form some hydroxylamine as it is the weak base:

\(HONH_3^++H_2O\rightleftharpoons H_3O^++HONH_2\)

Whereas the equilibrium expression is:

\(Ka=\frac{[H_3O^+][HONH_2]}{[HONH_3^+]}\)

Whereas Ka is computed by considering Kw and Kb of hydroxylamine:

\(Ka=\frac{Kw}{Kb}=\frac{1x10^{-14}}{9.10x10^{-9}} \\\\Ka=1.10x10^{-6}\)

So we can write:

\(1.10x10^{-6}=\frac{x^2}{0.0858-x}\)

And neglect the x on bottom to obtain:

\(1.10x10^{-6}=\frac{x^2}{0.0858}\\\\x=\sqrt{1.10x10^{-6}*0.0858}=3.07x10^{-4}M\)

And since x=[H3O+] we obtain the following pH:

\(pH=-log(3.07x10^{-4})\\\\pH=3.513\)

Regards!

Answer:

The answer is D

Explanation:

The element is in the 3rd period because n = 3.

Answer:

If there are more products than reactants, that means the reaction has shifted towards the left, which is the backward direction. If there are more reactants than products, that means the reaction has shifted towards the right, which is the forward direction.

Option (e) is correct. Alcohol is not a humectant because it binds to water and dehydrates the body.

Humectant is a substance which is used to keep things moist. A humectant attracts and retains the moisture in the air nearby via absorption. Sorbitol is a naturally occurring polyol. It is widely used in the food industry as a humectant. Sorbitol is a good humectants. Glycerol is a humectant which is most often derived naturally from vegetable oils. Humectants work to preserve other skincare ingredients and retain moisture by drawing water from the surface of your skin down into the deeper skin layers. Lanolin oil softens the skin and is a good humectant making it ideal for use in you skin care products. Methyl is an extremely effective humectant for both rinse off and leave on products. It is recommended for use in skin care products including lotions and creams.

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Answer:

Potential energy = 441 N

Explanation:

Given:

Mass M = 15 kg

Height = 3 m

Find:

Potential energy

Computation:

Potential energy = mgh

Potential energy = (15)(9.8)(3)

Potential energy = 441 N

Answer:

so I don't know how to answer that

Answer:

B. 8

Explanation: