Dose any one know how to do b and c for number 8

Answer:

I believe it is a physical change

Explanation:

The telltale sign of a chemical change is the formation of a new substance. They also usually involve the production of energy (heat, light, sound etc.)

The chemical D is  FeSO4 · 7H2O which is a green crystalline solid. When dissolved in water it gives a very pale green solution. The chemical E is Fe(OH)3 which is reddish brown in color. The chemical F is BaSO4 which is white in color.

D =  FeSO4 · 7H2O hydrated ferrous sulfate.

E = Fe(OH)3 ferric hydroxide

F= BaSO4  barium sulphate

A chemical response happens while one or extra chemical substances are modified into one or extra different chemicals. For Example iron and oxygen combine to make rust. vinegar and baking soda combine to make sodium acetate, carbon dioxide, and water. techniques concerning the atomic nucleus are called nuclear reactions. The substances that participate in a chemical reaction are known as reactants.

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Answer:If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid. The most energetic particles at the surface escape from the surface of the liquid as a vapour as it gets warmer. Liquids evaporate faster as they heat up and more particles have enough energy to break away.

Explanation:

Answer: Lightning travels much faster than thunder so lightning is seen before thunder is heard.

The limiting reactant is N₂O₄ and the mass of N₂ formed from the reaction is 45.7 g (Option C)

The limiting reactant can be obtained as illusrated below:

N₂O₄ + 2N₂H₄ -> 3N₂ + 4H₂O

From the balanced equation above,

92.02 g of N₂O₄ reacted with 64.1 g of N₂H₄

Therefore,

50 g of N₂O₄ will react with = (50 × 64.1) / 92.02 = 34.83 g of N₂H₄

From the above calculation, we can see that only 34.83 g of N₂H₄ out of 45.0 g reacted.

Thus, the limiting reactant is N₂O₄

The limiting reactant shall be used in this case in order to obtain a maximum yield of N₂. Details below:

92.02 g of N₂O₄ reacted to produce 84.06 g of N₂

Therefore,

50 g of N₂O₄ will react to produce = (50 × 84.06) / 92.02 = 45.7 g of N₂

Thus, the mass of N₂ formed is 45.7 g

Therefore, the correct answer to the question is (Option C)

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The frequency of this radiation of a quantum of energy 4.14 *10-14 J is calculated to be 2.58 *10-15 Hz.

The Photoelectric Effect occurs when electrons are released from a metal surface when light strikes it. It was once thought that the greater the intensity of incoming light, the greater its energy, independent of hue. The light was viewed and treated as a wave, however, the wave phenomenon could not explain light's photoelectric actions.

The Quantum, according to Max Planck, is the smallest unit of energy that is released or absorbed in the form of electromagnetic radiation. The energy released or absorbed is proportional to the frequency of the radiation. It may be expressed mathematically as:

E= hc/λ

or

E= hf        ( because, f = c/λ)

where,

E= Energy of the particle

h= Planck's constant

c= speed of light

λ= wavelength of the particle

f = frequency of the radiation

Thus, E= hf

Given,

E = 4,14*10-14J

E= 1.71017356 * 10^20 eV

h= 6.626 *10-34 m2Kg/s

E=hf

f= E/h

f= (1.71017356 * 10^20 eV) / (6.626 *10-34 m2Kg/s)

f= C

Thus, the frequency of this radiation is 6.626 *10-34 m2Kg/s.

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Answer:

True

Explanation:

Because in outer space there is some plants that don't have an atmosphere but earth dose that is why the whether changes cold to hot it like humans breathing in oxygen and blowing it out.

The mass percentage of C in morphine would be 4.21%.

The mass percentage of a composition in a compound is the mass of the composition relative to the mass of the entire compound. This can be mathematically expressed as:

Mass percentage = mass of component/mass of substance x 100%

In this case, we are looking for the mass percentage of C in \(C_{17}H_{19}NO_3\).

Molar weight of C = 12 g/mol

Molar mass of  \(C_{17}H_{19}NO_3\) = (12x17) + (1x19) + (14x1) + (16x3)

                                             = 285 g/mol

Mass percentage of C = 12/285

                                     = 4.21% to 2 decimal places.

In other words, the mass percentage of C in morphine is 4.21%.

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The volume in millilitres of 2.37M potassium hydroxide that contains 9.29g of solute is 70mL.

Volume of a solution can be calculated from the molarity, which is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

Molarity = no of moles ÷ volume

no of moles = mass ÷ molar mass

Molar mass of pottasium hydroxide (KOH) = 56.1056 g/mol

moles = 9.29g ÷ 56.1056 g/mol = 0.166moles

2.37 = 0.166/V

V = 0.166 ÷ 2.37

V = 0.07L

Volume in millilitres = 70mL

Therefore, 70mL is the volume of the pottasium hydroxide solution.

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The number of moles of NaOH is calculated by multiplying the moles of KHP by the mole ratio of NaOH to KHP, which is found by the balanced chemical reaction previously discussed.

A titration is described as "the process of determining the amount of a substance A by adding calibrated increments of substance B, the titrant, with which it reacts until exact chemical equivalency is obtained (the equivalence point)" (Oxford Dictionary of Chemical Terms).

The moles of KHP are multiplied by the mole ratio of NaOH to KHP, which is determined by the balanced chemical reaction mentioned above, to determine the number of moles of NaOH. 3. To determine the molarity of the NaOH solution, divide the moles of NaOH by the amount of NaOH solution needed to reach the titration's endpoint, in this case, litres.

The formula is molarity (M) of the acid x volume (V) of the acid = molarity (M) of the base x volume (V) of the base when the titrant and analyte have a mole ratio of 1:1. The concentration of a solution, measured in moles of solute per litre of solution, is known as its molarity.

Ha has a 268-gram mass per mole in its molar form. Ha is not a recognised chemical symbol for an element.

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Answer: The property of all bases is that they are substances which neutralizes an acid to form a salt and water only.

Explanation:

A base is also s substance that can accept or combine with a proton; a proton acceptor.

Bases include the oxides, hydroxides and carbonates of metals. These include MgO,Na2O, NaOH,Ca(OH)2. Most metals burn in oxygen to form metallic oxides which are basic. Examples are the MgO and Na2O.

Other properties or characteristics of bases includes:

--> They have a bitter taste.

--> They turn red litmus paper blue.

--> They are soapy to touch.

--> Aqueous solutions of bases are also electrolytes. Bases can be either strong or weak, just as acids can.

Bases (sodium hydroxide) can be used in the preparation of soaps, glass, paper and rayon. While some bases (magnesium hydroxide) can also be used to manufacture toothpaste and laxatives.

An example of heterogeneous equilibrium is:

Heterogeneous equilibrium refers to an equilibrium state in a chemical reaction where the reactants and products exist in different physical states or phases. It occurs when substances in different phases, such as solids, liquids, and gases, are involved in a chemical reaction.

Considering the given equations:

The equation I: FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g) represents a heterogeneous equilibrium.

This is because the reactants and products involve different phases (solid and gas). FeO is a solid (s), CO is a gas (g), Fe is a solid (s), and CO₂ is a gas (g). The reaction involves the conversion of a solid and a gas to another solid and a gas, and the equilibrium is established between these different phases.

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Indicators are weak acids or bases that exhibit a color change as hydrogen ion concentration in a solution varies or as a solution's pH changes.

In the water, the indicators gently separate to produce ions.

The three examples of indicators are

If the potassium atoms could be lined up in a row, it would take to make a 1.00 ft row of potassium atoms is 5.45 × 10⁻⁸.

Potassium atom is represented by K with atomic number 19. It is a silvery white metal.

Given,

Radius = 280pm = 280 × 10⁻¹²m

Diameter = 2radius = 560× 10⁻¹²m = 560pm

We know that,

1 feet = 0.305m

So, number of potassium atoms that fits into the row,

1 feet = 0.305/560 × 10⁻¹²

1 feet = 5.45 × 10⁻⁸

Hence, it takes 5.45 × 10⁻⁸ atoms of potassium to make a 1 feet row.

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Answer:

1940K and 1939K Isotopes are two forms of the same element that have different numbers of neutrons in the nucleus. This means same symbol, and same atomic number (subscript), but different mass number (superscript).

The boiling point of the 0.53 m aqueous solution of LiBr, given the bp as 100 °C, is 100.27 °C

First, we shall obtain the boiling point elevation. This is shown below:

ΔTb = kb × m

ΔTb = 0.512 × 0.53

ΔTb = 0.27 °C

Finally, we shall obtain the boiling point of the solution. This shown below:

Boiling point of solution = bp + ΔTb

Boiling point of solution = 100 + 0.27

Boiling point of solution = 100.27 °C

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Answer: 100.54

Explanation:

Acellus

The answer is A, to my brain power ig B)

Chemical weathering is the decomposition of rocks and minerals by chemical means. Dissolving limestone by acid rain is an example of chemical weathering. Hence, option A is correct.

Weathering is the process of decomposition of rocks and minerals in the earth by some physical or chemical factors. Weathering by heat, pressure and wind are called physical weathering.

Reaction with acids, water or air also lead to weathering of rocks. The chemical reaction taking place there can decompose the rock and form new products make cracks and color changes in the rocks.

Lime stones are made of calcium carbonate. When limestone reacts with an acid , it decomposes into its salt and carbon dioxide. Therefore, it is an example of chemical weathering. Hence, option A is correct.

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The given reaction releases 906 kJ of heat energy when 4 moles of ammonia react.

So, the amount of heat energy released when 1 mole of ammonia reacts is:

906 kJ ÷ 4 mol = 226.5 kJ/mol

To produce 453 kJ of heat energy, we can use the following proportion:

226.5 kJ/mol = 453 kJ/x

where x is the number of moles of ammonia required.

Solving for x, we get:

x = (453 kJ × 4 mol) ÷ 906 kJ

x ≈ 2 mol

Therefore, 2 moles of ammonia must react to produce 453 kJ of heat energy.

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The given reaction releases 906 kJ of heat energy when 4 moles of ammonia react.

So, the amount of heat energy released when 1 mole of ammonia reacts is:

906 kJ ÷ 4 mol = 226.5 kJ/mol

To produce 453 kJ of heat energy, we can use the following proportion:

226.5 kJ/mol = 453 kJ/x

where x is the number of moles of ammonia required.

Solving for x, we get:

x = (453 kJ × 4 mol) ÷ 906 kJ

x ≈ 2 mol

Therefore, 2 moles of ammonia must react to produce 453 kJ of heat energy.

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Answer:

\(\huge\boxed{\sf Q = 13.7\ Joules}\)

Explanation:

Given Data:

Mass = m = 96 g = 0.096 kg

\(T_1\) = 124 °C

\(T_2\) = 158 °C

Change in Temp. = ΔT = 158 - 124 = 34 °C

Specific Heat Constant = c = 4.186 J/g °C

Required:

Specific Heat Capacity = Q = ?

Formula:

Q = mcΔT

Solution:

Q = (0.096)(4.186)(34)

Q = 13.7 Joules

\(\rule[225]{225}{2}\)

Hope this helped!

Answer:

\(\Large \boxed{\sf 13600 \ J}\)

Explanation:

Use formula

\(\displaystyle \sf Heat \ (J)=mass \ (g) \times specific \ heat \ capacity \ (Jg^{-1}\°C^{-1}) \times change \ in \ temperature \ (\°C)\)

Specific heat capacity of water is 4.18 J/(g °C)

Substitute the values in formula and evaluate

\(\displaystyle \sf Heat \ (J)=96 \ g \times 4.18 \ Jg^{-1}\°C^{-1} \times (158\°C-124 \°C)\)

\(\displaystyle Q=96 \times 4.18 \times (158-124 )=13643.52\)

The correct option is B. CaBr2 + 2Na → 2NaBr + Ca because In option B, the reactants CaBr2 and Na are both metals with similar reactivities.

Exothermic reactions release energy and are defined as producing products with higher stability (lower energy) than the reactants. The exothermic reaction that happens during a fire and releases energy in the form of heat and light is the combustion reaction.

In terms of reactivity, the metals that are listed in the periodic table's lower left corner are the most active. Lithium, sodium, and potassium, for instance, all interact with water.

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Question:

Based on the reactivities of the elements involved, which reaction will form products that are more stable than the reactants?

A. 2AlBr3 + 3Zn → 3ZnBr2 + 2Al

B. CaBr2 + 2Na → 2NaBr + Ca

C. MgBr2 + H2 → 2HBr + Mg

D. BaBr2 + Ca → CaBr2 + Ba

E. 2LiBr + Ba → BaBr2 + 2Li

Answer:

A. Sturdy

Explanation:

Unlike every other answer, the cell wall is the part of the cell that acts as a strong barrier of the cell. In this case, it is sturdy.

Answer:

Magnesium reacts with dilute hydrochloric acid in a conical flask which is ... One student can add the magnesium ribbon to the acid and stopper the flask, ... 50 cm3 of 1M hydrochloric acid is a six-fold excess of acid.

Answer:

c. they have the same number of valence electrons

The Statement 3 (the products have more potential energy than the reactants in an exothermic reaction) is partially correct because the products do have lower potential energy than the reactants in an exothermic reaction.

The correct statement regarding endothermic and exothermic reactions is:

Energy is absorbed in an endothermic reaction.

In an endothermic reaction, energy is taken in from the surroundings, usually in the form of heat. The reactants have a lower energy level than the products, so energy must be absorbed to reach the higher energy state of the products. This energy absorption causes a decrease in the temperature of the surroundings, making the reaction feel cold.

On the other hand, in an exothermic reaction, energy is released. The reactants have a higher energy level than the products, so energy is released during the reaction, usually in the form of heat. This energy release causes an increase in the temperature of the surroundings, making the reaction feel warm or hot.

Therefore, statement 2 (energy is released in an endothermic reaction) and statement 4 (the products have more potential energy than the reactant in an endothermic reaction) are incorrect.

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This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

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The value of Kc for the given reaction is 0.0579 (rounded to four decimal places).

The formula for the equilibrium constant, Kc, of a reaction is given by the ratio of the product of the concentrations of the products raised to their respective stoichiometric coefficients to the product of the concentrations of the reactants raised to their respective stoichiometric coefficients.

The stoichiometric coefficients are the coefficients in the balanced chemical equation.

To determine the value of Kc for the reaction given by the following chemical equation:N2(g) + 3 H2(g) ⇌ 2 NH3(g)

we first need to write the expression for Kc.

The expression for Kc is given by the following formula:Kc = [NH3]² / [N2][H2]³.

We are given the equilibrium concentrations as follows:[N2]eq = 2.66 M[H2]eq = 0.64 M[NH3]eq = 3.34 M

We can substitute these values into the expression for Kc and obtain the following:Kc = (3.34)² / (2.66)(0.64)³ = 0.0579 (rounded to four decimal places).

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Answer:

The second period starts with Lithium and Beryllium which have 3 and 4 electrons and hence the last electrons enter the level 2s and they have an electronic configuration of 1s22s1 and 1s22s2

Considering the definition of mass molar and Avogadro's Number, there are 3.0115×10²⁹ molecules in 1 ton of hydrogen.

First, the molar mass of hydrogen H₂, that is, the amount of mass that a substance contains in one mole, is 2 g/mole.

In this case, being 1 ton = 1,000,000 grams, the number of moles that 1 ton of hydrogen contains is calculated as:

\(1,000,000 gramsx\frac{1 mole}{2 grams} = 500,000 moles\)

On the other hand, Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole.

Then, the number of molecules that 500,000 moles of hydrogen contains is calculated as:

\(500,000 molesx\frac{6.023x10^{23} molecules }{1 mole}\)= 3.0115×10²⁹ molecules

Finally, there are 3.0115×10²⁹ molecules in 1 ton of hydrogen.

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