nononononononononononon

Answer:

water

Explanation:

specific heat means the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree.

Answer:

The answer is true

Explanation:

the ovary is a tubular structure and contains ovules

Answer:

D) a four-fold increase

Explanation:

According to Gay-Lussac's law, which states that the pressure of a given amount of gas is directly proportional to the temperature at a constant volume, the pressure increases with an increase in temperature.

According to this question, at a fixed volume, a four-fold increase in the temperature of a gas will lead to a four-fold increase in the pressure as well.

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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Answer:

pH = 1.05

Explanation:

A solution of sulfuric acid, H₂SO₄, dissociates in water as follows:

H₂SO₄ → 2H⁺ + SO₄²⁻

That means per mole of H₂SO₄ you will have 2 moles of H⁺

pH = -log [H⁺]

As [H₂SO₄] = 0.045M and [H⁺] = 2×[H₂SO₄]

[H⁺] = 0.090M

pH = -log [0.090M]

Answer:

2.275x10⁶g of CN⁻¹ were dissolved in the sample

Explanation:

Molarity is defined as the ratio between moles of solute and liters of solution.

If a CN⁻¹ solution has a concentration of 25mM, there are 0.025 moles of CN⁻¹ per liter of solution.

If the sample has a colume of 3.5x10⁶L, moles of CN⁻¹ are:

3.5x10⁶L × (0.025moles / L) = 8.75x10⁴ moles of CN⁻¹ in the sample of water.

In grams (As molar mass of CN⁻¹ is 26g/mol):

8.75x10⁴ moles CN⁻¹ × (26g / mol) = 2.275x10⁶g of CN⁻¹ were dissolved in the sample

The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)

In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.

The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.

The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.

In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.

It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.

Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.

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Answer:

B

Acid H3PO4 And base H2O

Explanation:

The length of the real-life crystal is 120 cm which is 24 times longer than the length of the crystal in the model.

Given that, a student makes a model of a mineral crystal.

The scale is 1:24. The crystal in the model is 5 cm long.

We are given a scale of 1:24, which means that every unit in the model represents 24 units in real life.

To find the length of the real-life crystal, we need to use the scale factor of 24.

We can set up a proportion to solve for the real-life length of the crystal:

1 unit in the model : 24 units in real life

5 cm in the model : x cm in real life

Using cross-multiplication, we get:

1 × x = 24 × 5

x = 24 × 5

x = 120cm

Therefore, the real-life crystal measures 120cm.

Option A) 120cm is the correct answer.

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Since it reflects no change in volume – it is most likely that the data recorded in row B is erroneous.

In order to pinpoint the row with a probable error, we will scrutinize the correlation between temperature and volume.

Typically, whenever there is an increase in temperature, there would be an accompanying escalation in the volume of a given substance.

Let's take a closer look at the values reflected in the table:

From A to B: Temperature rises but the volume remains stagnant.

From B to C: Both temperature and volume show an increment.

Similarly, from C to D, as well as from D to E, we see that for every rise in temperature, there is subsequently more volume illustrated.

Given the dissimilarity between rows A and B – where the former shows a temperature increase while the latter reflects no change in volume – it is most likely that the data recorded in row B is erroneous.

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Which row in the table below is likely to represent an error in the student's data collection?

Temperature (°C) Volume (cm³)

A 2.4 5.8

B 21.5 5.8

C 39.6 6.7

D 55.6 6.9

E 71.2 7.4

Answer:

A student collected the data shown above. Row

✔ B

may represent an error.

Explanation:

edge 2023

Answer:

0.0084

Explanation:

The mole fraction of BaCl₂ (X) is calculated as follows:

X = moles BaCl₂/total moles of solution

Given:

moles of BaCl₂ = 0.400 moles

mass of water = 850.0 g

We have to convert the mass of water to moles, by using the molecular weight of water (Mw):

Mw of water (H₂O) = (2 x 1 g/mol)+ 16 g/mol = 18 g/mol

moles of water = mass of water/Mw of water = 850.0 g/(18 g/mol) = 47.2 mol

The total moles of the solution is given by the addition of the moles of solute (BaCl₂) and the moles of solvent (water):

total moles of solution = moles of BaCl₂ + moles of water = 0.400 + 47.2 mol = 47.6 mol

Finally, we calculate the mole fraction:

X = 0.400 mol/47.6 mol = 0.0084

Answer:

C. average transnational kinetic energy of the particles in an object.

Explanation:

The temperature decreases to 4°C and the volume decreases to 0.153 L. Therefore, the pressure at this depth is 804.23 atm.

The term pressure is defined as a way of measure out how much force is acting over an area. A strong forcing on a small area causes high pressure, while a weak push spread out over a large area creates only a little pressure.

PV = nRT

n = 0.0500 mol

P = ?

V = 1.53 L

T = 296 K

R = gas constant 8.314

By substituting this value in given equation we get,

P = 0.500 × 8.314 × 296 / 1.53

P = 804.23atm

Thus, the pressure at this depth is 804.23 atm.

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The pressure of the gas is now obtained as 32.7 atm.

We know that the reaction has been shown in the question and we have been asked to be able to obtain the final pressure of the system. We need to obtain the limiting reactant so that we can be able to get the amount of the product that is formed.

If 1 mole of phosphorus reacts with 6 moles of chlorine

0.351 moles of  phosphorus reacts with 0.351 moles * 6 moles/1 mole

= 2.1 moles

Thus chlorine is the limiting reactant.

6 moles of chlorine produces 4 moles of phosphorus trichloride

1.17 moles of chlorine produces 1.17 moles * 4 moles/6 moles

= 0.78 moles

We would now apply the ideal gas equation;

PV = nRT

P = pressure

V = volume

n = Number of moles

R = gas constant

T = temperature

Then

P = nRT/V

P = 0.78 * 0.082 * 572/1.12

P = 32.7 atm

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Answer:

D. Speed up and spread out

The pressure inside the tire is approximately 1.970796 newtons per square centimeter (N/cm²) when measured in those units.

To convert the pressure from pounds per square inch (psi) to newtons per square centimeter (N/cm²), we need to use the conversion factors between these units.

First, let's convert pounds to newtons:

1 pound = 0.45359237 kilograms

1 kilogram = 9.80665 newtons

Next, let's convert square inches to square centimeters:

1 square inch = 6.4516 square centimeters

Now, we can perform the conversion:

1 psi = (0.45359237 kg) × (9.80665 N/kg) / (6.4516 cm²)

≈ 0.070307 N/cm²

Therefore, the pressure inside the tire of 28.0 psi is approximately equal to 28.0 × 0.070307 N/cm², which is approximately 1.970796 N/cm².

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Answer:

near an open flame

Explanation:

if your hair is not tied back near open flames in combination with most hair care products it would turn you into a living torch

Long, unrestrained hair is most likely to be a safety concern near an open flame in the laboratory and the correct option is option 1.

The open flame poses a direct risk of igniting loose hair, potentially causing burns or fires. In a laboratory setting, there are often various sources of open flames, such as Bunsen burners, gas stoves, or torches.

The heat and proximity of these flames increase the likelihood of hair coming into contact and catching fire. To prevent accidents, it is essential to follow proper safety protocols and secure long hair by tying it back or using hair restraints when working in areas with open flames. This precaution helps minimize the risk of personal injury and maintains a safe working environment.

Thus, the ideal selection is option 1.

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Answer: Industrial processes including mining and manufacturing historically have been leading causes of soil pollution. Industrial areas typically have much higher levels of trace elements and organic contaminants. This is due to intentional and unintentional releases from industrial processes directly into the environment, including to the soil, adjacent water bodies, and the atmosphere.

Explanation:

Answer:

Since 2H₂ + O₂ ---> 2H₂O

We need 2 moles of hydrogen for each mole of oxygen

So, we need 2(6) = 12 moles of H₂ but since we only have 10 moles,

H₂ is the limiting reagent

So since 2 moles of H₂ gives 2 moles of water,

10 moles of H₂ will give rise to 10 moles of Water with 1 mole of remaining oxygen

The values of X and Y in the diagram represent the progress of the reaction along the x-axis and the potential energy along the y-axis, respectively.

To determine whether the student's sketch of the potential energy diagram for an exothermic reaction is correct or incorrect, we need to understand the characteristics of such a reaction. In an exothermic reaction, the reactants have a higher energy level than the products, and energy is released during the reaction.The potential energy diagram should have the reactants positioned at a higher energy level (y-axis) than the products. As the reaction progresses from reactants to products, the potential energy should decrease, indicating the release of energy. This decrease in energy should be evident in the form of a downward slope or a curve.If the student's sketch accurately depicts these characteristics, with the reactants at a higher energy level than the products and a downward slope or curve indicating energy release, then the diagram is correct. However, if the student's sketch shows the reactants at a lower energy level or depicts an upward slope, it would be incorrect.The x-axis typically represents the reaction coordinate, which can be the extent of the reaction or the progression of time.

The y-axis represents the potential energy, which can be measured in joules or any other energy unit. The specific values on the axes will depend on the reaction and the units chosen.

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A physical change is a change from one state of matter to another; a chemical change results in the formation of a new substance.

Examples of physical changes include changes in the composition or size of materials. Physical changes include changes from one state to another, for as going from a solid to a liquid or a liquid to a gas. Some of the processes that result in physical changes are cutting, bending, dissolving, freezing, boiling, and melting.

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Answer:

a)  \(T_b=590.775k\)

b)  \(W_t=1.08*10^4J\)

d)  \(Q=3.778*10^4J\)

d)  \(\triangle V=4.058*10^4J\)

Explanation:

From the question we are told that:

Moles of N2 \(n=2.50\)

Atmospheric pressure \(P=100atm\)

Temperature \(t=20 \textdegree C\)

                      \(t = 20+273\)

                     \(t = 293k\)

Initial heat \(Q=1.36 * 10^4 J\)

a)

Generally the equation for change in temperature is mathematically given by

\(\triangle T=\frac{Q}{N*C_v}\)

  Where

  \(C_v=Heat\ Capacity \approx 20.76 J/mol/K\)

\(T_b-T_a=\frac{1.36 * 10^4 J}{2.5*20.76 }\)

\(T_b-293k=297.775\)

\(T_b=590.775k\)

b)

Generally the equation for ideal gas is mathematically given by

 \(PV=nRT\)

For v double

 \(T_c=2*590.775k\)

 \(T_c=1181.55k\)

Therefore

\(PV=Wbc\)

\(Wbc=(2.20)(8.314)(1181_590.778)\)

\(Wbc=10805.7J\)

Total Work-done \(W_t\)

\(W_t=Wab+Wbc\)

\(W_t=0+1.08*10^4\)

\(W_t=1.08*10^4J\)

c)

Generally the equation for amount of heat added is mathematically given by

\(Q=nC_p\triangle T\)

\(Q=2.20*2907*(1181.55-590.775)\\\)

\(Q=3.778*10^4J\)

d)

Generally the equation for change in internal energy of the gas is mathematically given by

\(\triangle V=nC_v \triangle T\)

\(\triangle V=2.20*20.76*(1181.55-293)k\)

\(\triangle V=4.058*10^4J\)

Answer:

The appropriate reagent is: H3PO2.

Explanation:

H3PO2 is in charge of eliminating the amino group by diazotization, remember that the amino group had previously achieved bromination at positions m; that is to say that it achieved in the beginning that the three bromine atoms of 1,2,4 tribromobenzene were introduced in the meta positions among themselves, which finally corresponds as part of the last reaction to the 1,3,5-tribromobenzene position.

The balanced equation is:

Chemical equation is simply a representation of chemical reaction with symbols and formula of the reactants and products involved in the reaction.

The balancing of chemical equation is guided by the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one for to the other.

Thus, an unbalanced equation simply means that matter has been created or destroyed.

Now, we shall balance the equation given in the question as follow:

C₆H₆ + O₂ —> H₂O + CO₂

There are 6 atoms of H on the left side and 2 atoms on the right side. It can be balance by writing 3 before H₂O as shown below:

C₆H₆ + O₂ —> 3H₂O + CO₂

There are 6 atoms of C on the left side and 1 atom on the right side. It can be balance by writing 6 before CO₂ as shown below:

C₆H₆ + O₂ —> 3H₂O + 6CO₂

There are 2 atoms of O on the left side and a total of 15 atoms on the right side. It can be balance by writing \(\frac{15}{2}\) before O₂ as shown below:

C₆H₆ + \(\frac{15}{2}\)O₂ —> 3H₂O + 6CO₂

Multiply through by 2 to clear the fraction.

Now, the equation is balanced.

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Taking into account the Law of Conservation of Mass, the balanced reaction is:

2 C₆H₆ + 15 O₂ → 6 H₂O +  12 CO₂

In first place, you have to know that the Law of Conservation of Mass postulates that "mass is neither created nor destroyed, it only transforms."

This means that the reagents interact with each other and form new products with different physical and chemical properties than the reagents.

But the amount of matter or mass before and after the chemical reaction is always the same, that is, the amounts of the masses involved in a given reaction must be constant at all times, not changing in their proportions when the reaction ends.

So, since the mass of the reactants must be equal to the mass of the products, the number of atoms present in the reactants must be kept in the products. Therefore, the equation must be balanced.

To balance the chemical equation, you must first look at the subscripts next to each atom to find the number of atoms in the equation. If the same atom appears in more than one molecule, you must add its amounts.  

The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.

By multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction.

Then, taking into account all of the above, in this case you can determine the amount of elements on each side of the equation:

Left side: 6 C, 6 H and 2 O

Right side: 1 C, 2 H and 3 O

In first place, you can balanced the C:

C₆H₆ + O₂ → H₂O +  6 CO₂

Then, you have:

Left side: 6 C, 6 H and 2 O

Right side: 6 C, 2 H and 13 O

Now, balanced the H:

C₆H₆ + O₂ → 3 H₂O +  6 CO₂

Then, you have:

Left side: 6 C, 6 H and 2 O

Right side: 6 C, 6 H and 15 O

Finally, balanced the O:

C₆H₆ + \(\frac{15}{2}\) O₂ → 3 H₂O +  6 CO₂

Then, you have:

Left side: 6 C, 6 H and 15 O

Right side: 6 C, 6 H and 15 O

The reaction is balanced, but you can't balance a chemical equation with fractions, so multiplying all the stoichiometric coefficients by 2 finally obtains:

2 C₆H₆ + 15 O₂ → 6 H₂O +  12 CO₂

Finally, the balanced reaction is:

2 C₆H₆ + 15 O₂ → 6 H₂O +  12 CO₂

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Answer:

Option B is correct.

4

Explanation:

We know that an atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example, if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

In given problem we are given with 2 neutrons of helium. We know that the atomic number of He is 2. Thus Mass number of He is,

Number of neutrons + number of proton

2 + 2 = 4

Thus, option B is correct.

Li and Na two elements have chemical properties that are most similar

The element that have the most similar chemical properties are those in the same group or column of the periodic table and one such group includes lithium sodium potassium these element are all shiny and conduct heat and electricity well and have similar chemical properties and the element in a group have the same number of electron in the outermost shell hence they have similar chemical properties

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Answer:

SI unit: kg/m³

but g/cm³ is commonly used

Explanation:

Answer:

you need to state the options