Calculate the volume of an object (in mL) if the density of the object is 4.08 g/mL and the mass of the object is 10.02 g.
Round your answer to one decimal.

Answer:

1.11 M

Explanation:

M₁V₁ = M₂V₂

Step 1: Define

Molarity₁ = 2.50 M

Volume₁ = 0.890 L

Molarity₂ = unknown

Volume₂ = 2.00 L

Step 2: Substitute and Evaluate for M₂

(2.50 M)(0.890 L) = (M₂)(2.00 L)

2.225 = M₂(2.00 L)

M₂ = 1.1125 M

Step 3: Simplify

We are given 3 sig figs.

1.1125 M ≈ 1.11 M

0.167L

In order to know how much L of the 3M NaOH solution would you need, we will simply set up an equal proportion solution expressed as;

C1 and C2 are the concentration of the solutions

V1 and V2 are the volumes of the solutions

Given the following parameters;

C1 = 1M

V1 = 500mL

C2 = 3M

V2 = ?

Substitute the given parameters into the formula above to get the required litre of solution needed.

Divide both sides by 3:

Converting to litres

Since 1mL = 0.001L

166.67mL = x

Cross multiply

Hence the amount of L of the 3M NaOH solution would you need is 0.167L

A liquid substance that could be used in the laboratory for dissolving dry mortar on floor tiles is vinegar; (i) removing KMnO₄, stains is sodium metabisulfite solution; drying acid anhydrides is concentrated sulfuric acid.

Solvents are substances usually liquids, but may also be gases or solids that dissolve other substances known as solutes.

Solvents are usually used as cleansing agents.

One possible liquid substance that could be used for dissolving dry mortar on floor tiles is a mild acid solution, such as diluted hydrochloric acid or vinegar.

KMnO₄ stains are often difficult to remove, but one substance that can be used is sodium metabisulfite (Na₂S₂O₅) solution. Sodium metabisulfite acts as a reducing agent and can effectively neutralize and remove KMnO₄ stains.

Concentrated sulfuric acid is commonly used in the laboratory as a drying agent. It has a strong affinity for water and can efficiently absorb moisture, including water present in acid anhydrides.

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Long:-

Control puede ser el dominio sobre algo o alguien, una forma de fiscalización, un mecanismo para regular algo manual o sistémicamente o un examen para probar los conocimientos de los alumnos sobre alguna materia. La palabra control deriva del francés antiguo controle que se refería a un registro que lleva un duplicado.

Inshot:-

Examen u observación cuidadosa que sirve para hacer una comprobación.

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Because air puffs up the cream as it is whipped, there is a physical change even though the ingredients are still cream and air.

Physical modifications are those that affect a chemical substance's form but not its chemical content. Physical changes may normally be used to separate compounds into chemical elements or simpler compounds, but they cannot be used to separate mixtures into their component compounds.

Liquid cream is extensively combined with small air bubbles to form the foam colloid known as whipped cream. Because milk is transformed from a colloid (cream) to a solid (butter) without changing its chemical makeup, turning milk into butter is a physical transformation. This change in the body can be undone.

Thus, there is a physical change even though the ingredients are still cream and air.

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Answer:

The ideal gas law is a formula that relates the pressure, volume, temperature, and number of moles of a gas. It can be expressed as:

PV = nRT

where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of the gas, R is the gas constant, and T is the temperature in Kelvin.

Since the number of moles and the temperature are constant in this problem, we can rearrange the formula to solve for the pressure:

P = (nRT) / V

Plugging in the known values, we get:

P = (nRT) / V

= (n * R * (35 + 273)) / 0.25 L

= (n * R * 308 K) / 0.25 L

We are given that the pressure is 500 mmHg and the volume is 0.25 L at this pressure, so we can set these equal:

500 mmHg = (n * R * 308 K) / 0.25 L

Solving for n, we get:

n = (500 mmHg * 0.25 L) / (R * 308 K)

We know that the pressure and volume of the gas at its original state are what we are trying to solve for. Let's call the original pressure P_0 and the original volume V_0. We can then express the relationship between the original and final state of the gas as:

P_0 * V_0 = n * R * T

Substituting the expression we found for n and the known values, we get:

P_0 * V_0 = ((500 mmHg * 0.25 L) / (R * 308 K)) * R * 308 K

Solving for P_0, we get:

P_0 = (500 mmHg * 0.25 L) / (R * 308 K) * (R * 308 K) / V_0

= (500 mmHg * 0.25 L) / (V_0)

Since V_0 = 0.5 L, we can substitute this value to get:

P_0 = (500 mmHg * 0.25 L) / (0.5 L)

= 500 mmHg / 2

= 250 mmHg

Therefore, the original pressure of the gas was 250 mmHg.

Answer:

B protons determine indentity and valence electrons determine chemical properties.

:)

Explanation:

Protons determine identity and valence electrons determine chemical properties of an atom.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

How many moles KCl in 1 grams? The answer is 0.013413582325

1 mole is equal to 1 moles KCl, or 74.5513 grams.

447.3078 is the answer

Explanation:

~Cornasha_Weeb

Answer:

The correct answer is - option 1. the molarity of H changes by one order of magnitude.

Explanation:

pH is dependent on the concentration of H+ not on the volume of H+ or the salt content.  The molarity of H+ changes by one order of magnitude with the change in pH of 1.0 unit that can be an increase or decrease in molar concentration by one order of magnitude or factor of 10.

Order of magnitude refers to the factor of ten or powers of ten. A change in the order is equal to the change of the exponent changes by ± 1

Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

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Rough ER is connected to the nuclear membrane and is responsible for the synthesis and processing of proteins.

The rough endoplasmic reticulum (ER) is a network of membrane-bound sacs and tubules that is studded with ribosomes on its surface. These ribosomes are responsible for protein synthesis. The rough ER is connected to the nuclear membrane because it receives instructions for protein synthesis from the DNA in the nucleus. This connection allows for the efficient transfer of genetic information from the nucleus to the rough ER.

Once the ribosomes on the rough ER synthesize proteins, the rough ER is also involved in the processing and modification of these proteins. It helps in folding the newly synthesized proteins into their functional three-dimensional shapes and also adds various modifications such as glycosylation (the addition of sugar molecules) or signal sequences that target the proteins to specific locations within or outside the cell.

After processing, the proteins may be transported to other parts of the cell or exported to the cell membrane or extracellular space. The connection between the rough ER and the nuclear membrane ensures a coordinated flow of genetic information and protein synthesis, allowing the cell to efficiently carry out its functions.

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Answer: Since all sodium atoms have 11 protons, this one has 11 protons. This tells us that it also has 11 electrons. Since the mass number is 23, we know that the sum of protons and neutrons in the nucleus must equal 23.

So the answer is : Mass number = 23

Explanation:

The International Union of Pure and Applied Chemistry (IUPAC) provides a standard system for naming organic compounds.

It is essential to learn this nomenclature system to communicate correctly about the chemical structures of compounds and how they relate to each other. Here is the IUPAC name of the following substance.Below is the structure of the given compound: In the given compound, there are four carbon atoms that are connected with single bonds. Carbon atoms are also attached to hydrogen atoms. Since it has four carbons in the main chain, the root name will be "but-". The functional group present in the molecule is the carboxylic acid group (-COOH), which gives the suffix "-oic acid." Therefore, the IUPAC name of the given substance is Butanoic acid.Thus, the IUPAC name of the given compound is Butanoic acid. It is essential to know the IUPAC naming of organic compounds to communicate correctly about the chemical structures of the compounds.

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• Given the balanced equation :

2LiOH + CO2 → Li2CO3 + H2O

• We can see that 2 moles of LiOH reacts with 1 mole of CO2.

1. Lets calculate number of moles

n = massLiOH/Molecular massLiOH

→Where molecular mass LiOH = 23.95 g/mol, and given Mass of LiOH = 80.5g

∴ n = 80.5g/23.95g/mol

n = 3.36 mol

2. Determine moles of CO2 required from the equation ratio:

2 moles LiOH : 1 Mol CO2 → 1 mol Li2O3 + 1 mol H20

So,

• Moles of CO2 required = 3.36 mol/2 = 1.68 moles

• Molar Mass CO2 = 44.01 g/mol

• Mass of CO2 = 44.01 g /moles* 1.68 moles

= 73.94 g

• This means that 73.94g of CO2 would be required to react with 80.5gLiOH

Answer:

5l NO

2

at STP

No. of molecules=

22.4

5

mol=

22.4

5

×N

A

molecules

A) 5ℊ of H

2

(g)

No. of moles=

2

5

mol=

2

5

×N

A

molecules

B) 5l of CH

4

(g)

No. of moles of CH

4

=

22.4

5

mol=

22.4

5

N

A

molecules

C) 5 mol of O

2

=5N

A

O

2

molecules

D) 5×10

23

molecules of CO

2

(g)

Molecules of 5l NO

2

(g) at STP=5l of CH

4

(g) molecules at STP

Therefore, option B is correct.

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Answer:

The uranium fluoresces under UV light

Explanation:

The uranium fluoresces under UV light because the UV excites the electrons above the ground state and gives off photons as the electrons transition back to the ground state,” Naomi Marks, a research scientist at the Lawrence Livermore National Laboratory in California, tells Collectors Weekly.

Answer:

Uranium oxide.

Explanation:

Uranium glass does indeed glow under a blacklight. This is because of the uranium oxide that is used to produce the glass. When exposed to ultraviolet light, the uranium oxide will emit a greenish-yellow light.

Answer:

Condensation

Explanation:

Zoe is quite keen to have noticed what we call condensation. Air contains many components, one of those being water vapor. Like how sugar is soluble in water, water can be said to be "soluble" in air. Water will evaporate into the air to a certain extent. The higher the temperature of the air, the more water the air can hold. If the air has more water that it can hold (potentially because of a temperature decrease), the extra water will come out of the air. Zoe's water bottle was cold, and because the air around Zoe's bottle had cooled down, the air can not hold as much water as it could when it was warm, so the air deposited the extra water in the form of liquid water onto the bottle, giving the illusion that her bottle was sweating.

Convex lenses refract light inward toward a focal point. Light rays progress through the edges of a convex lens and are bent most.

convex lenses are across in the middle. Rays of light that pass through the lens are conducted closer together (they converge). A convex lens is a meet lens. When parallel rays of light pass through a convex lens the refracted rays cross at one point called the principal focus.

. A convex lens is a connecting lens. When parallel rays of light pass through a convex lens the refracted rays merge at one point called the principal focus.

So we can conclude that Convex Lens. Concave Lens; It is known as a converging lens as light rays, when passed through this lens, tends to bend towards each other. It is known as a Convex Lens

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Answer: A model would be useful because the model makes the concepts easier to understand.

Explanation:

Models are helpful tools in science education that can be used to enhance explanations, spark discussion, make predictions, provide visual representations of abstract concepts, and create mental models.

The fact that the infrared thermometers used in medical research were first intended to detect the temperature on Mars has had an impact on that field of study.

Technology for use in outer space, in aviation or other operations outside of Earth's atmosphere, for things like spaceflight, space exploration, and Earth observation, is referred to as space technology.

By enabling high-speed data transport with the development of the internet, enabling research of global natural phenomena, and enabling environmental monitoring, space technology started to be employed for telecommunications and the environment.

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Answer:

Two.

Explanation:

Hello!

In this case, considering the attached picture wherein you can see the presence of the parent chain as aniline, we can see radicals at the nitrogen, named by N-ethyl and N-methyl which are the present alkyl substituents. In such a way, the benzene ring is not considered an alkyl radical because it belongs to the parent chain on aniline and therefore, N-ethyl-N-methylaniline has two alkyl substituents.

Best regards!

There are two alkyl substituents attached to the nitrogen; one ethyl and one methyl group

Aniline consists of a benzene ring to which an -NH2 moiety is attached. Usually, it is possible for the any of the two hydrogen atoms in the -NH2 moiety to become substituted leading to N-alkylated product.

In the compound N-ethyl-N-methylaniline, there are two alkyl substituents attached to the nitrogen; one ethyl and one methyl group as shown in the image attached to this answer.

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Answer:

Kc = [Pb²⁺]³.[PO₄³⁻]²

Explanation:

Let's consider the following reaction at equilibrium.

Pb₃(PO₄)₂(s) ⇄ 3 Pb²⁺(aq) + 2 PO₄³⁻(aq)

The concentration equilibrium constant is the product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients. It only includes gases and aqueous species.

Kc = [Pb²⁺]³.[PO₄³⁻]²

This equilibrium constant is known as the solubility product of Pb₃(PO₄)₂.

Answer: 45g of NO2 are produced (third option or letter C).

Explanation:

The question requires us to calculate the amount of NO2, in grams, that would be obtained from 250 mL of 2.6 M HNO3 and excess of NO in the following chemical reaction:

To solve this problem, we must calculate the number of moles of HNO3 used, considering the volume and solution concentration given, then use the stoichiometry of the reaction to calculate the amount of moles of NO2 produced and, at last, use the molar mass of NO2 to convert the number of moles to mass.

Considering the definition of molarity, we can write:

Thus we need the volume of HNO3 solution used (250 mL = 0.250 L) and the molarity of the solution (2.6 M) to calculate the number of moles of HNO3 used in the reaction:

Therefore, 0.65 moles of HNO3 were used in the reaction.

Considering the stoichiometry of the reaction, given by the chemical equation, we can say that 2 moles of HNO3 are necessary to obtain 3 moles of NO2. Thus, we can write:

2 mol HNO3 --------------------- 3 mol NO2

0.65 mol HNO3 ---------------- x

Solving for x, we'll have:

Therefore, 0.98 moles of NO2 are obtained when 0.65 moles of HNO3 are used.

Next, we need to use the molar mass of NO2 (46.00 g/mol) to calculate the mass that corresponds to 0.98 moles of NO2:

1 mol NO2 ---------------- 46.00g NO2

0.98 mol NO2 ---------- y

Solving for y, we'll have:

Therefore, 0.98 moles of NO2 correspond to 45g of this compound.

The best option to answer this question is the third one (or letter C): 45g.

Answer: a) \(H_3O^++CH_3O^-\rightleftharpoons CH_3OH+H_2O\)

acid : hydronium ion

base : methoxide ion

conjugate acid : methanol

conjugate base: water

b) \(CH_3CH_2O^-+HCl\rightleftharpoons CH_3CH_2OH+Cl^-\)

acid : hydrogen chloride

base : ethoxide ion

conjugate acid : ethanol

conjugate base: chloride ion

c) \(NH_2^-+CH_3OH\rightleftharpoons NH_3+CH_3O^-\)

acid : methanol

base : amide ion

conjugate acid : ammonia

conjugate base: methoxide ion

Explanation:

According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.

The species accepting a proton is considered as a base and after accepting a proton, it forms a conjugate acid.

The species losing a proton is considered as an acid and after loosing a proton, it forms a conjugate base

For the given chemical equation:

a) \(H_3O^++CH_3O^-\rightleftharpoons CH_3OH+H_2O\)

acid : hydronium ion

base : methoxide ion

conjugate acid : methanol

conjugate base: water

b) \(CH_3CH_2O^-+HCl\rightleftharpoons CH_3CH_2OH+Cl^-\)

acid : hydrogen chloride

base : ethoxide ion

conjugate acid : ethanol

conjugate base: chloride ion

c) \(NH_2^-+CH_3OH\rightleftharpoons NH_3+CH_3O^-\)

acid : methanol

base : amide ion

conjugate acid : ammonia

conjugate base: methoxide ion

.

Answer: % 50

Explanation: Aa x aa = Aa Aa aa aa

If you increase the pressure of the reaction 2A(g) + B(g)C(g) + 2D(g)the reaction will shift forward to the side with little moles of gas.

Le Chatelier's principle states that if pressure is raised, the reaction will favor the direction with a lower number of gas moles.

On this  case, the cleared out side includes a add up to of three gas moles (two moles of A and one mole of B), whereas the correct side covers four gas moles (one mole of C and two moles of D). In this way, the balance will move towards the left-hand side in arrange to diminish the collective gas particles and relieve the rise in weight. The levels of A and B will rise, as the levels of C and D will decrease.

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The specific heat capacity of the object is C = Q / (ΔT ⨉ m).The specific heat capacity of the object is 0.022.

The amount of heat or energy needed to raise a substance's temperature by 1 °C per unit mass of that substance is known as its specific heat capacity.

The equation is: C = Q / (T m).

Q= mc T

715 J = 105g * c* 298.5

715/ 105* 298.5 =c

715/ 31342.5 =c

0.022 =c

Therefore, The specific heat capacity of the object is C = Q / (ΔT ⨉ m).The specific heat capacity of the object is 0.022.

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