Plants need to take in gases and release gases during their
everyday life processes. What part allows plants to do this?

Answer:

See below ~

Explanation:

Basic oxides

Acidic oxides

you need to lose one electron

Answer:

The molal concentration of the solution is approximately 0.124 molal

Explanation:

The given parameters are;

The reduced freezing point of the water = -0.23°C

For freezing point depression of a solution, we have;

\(\Delta T_f\) = \(K_f\)· b·i

Where;

\(\Delta T_f\) = The freezing point depression

\(K_f\) = Cyroscopic constant (The freezing-point depression constant) = 1.86° Cm⁻¹ for water

b = The molality of the solution

i = van't Hoff factor = 1

Therefore;

\(\Delta T_f\) = \(T^{\circ}_f - T_f\)

Where;

\(T^{\circ}_f\) = The freezing point of pure water = 0°C

\(T_f\) = The freezing point of the solution = -0.23°C

∴ \(\Delta T_f\) = \(T^{\circ}_f - T_f\) = 0°C - (-0.23°C) = 0.23 °C

From, \(\Delta T_f\) = \(K_f\)· b·i, we have;

0.23°C = 1.86°C/m × b × 1

∴ b  = (0.23°C/1.86°C/m) ≈ 0.124 molal

Therefore, the molal concentration of the solution, b ≈ 0.124 molal.

Answer:

Ký hiệu hóa học (xem thêm ký hiệu) cho nước. Mỗi phân tử nước chứa hai nguyên tử hydro (H) liên kết với một nguyên tử oxy (O).

The chemical symbol (see also symbol) for water. Each molecule of water contains two atoms of hydrogen (H) joined to a single atom of oxygen (O).

Nascent hydrogen is more reactive than molecular hydrogen simply because nascent hydrogen is more reactive than molecular hydrogen.

This released energy activates the nascent hydrogen and makes it more energy rich than that of ordinary occurring molecular hydrogen.

An element can be defined as a substance which cannot be split into simpler units by an ordinary chemical process.

Below are examples of some chemical elements

So therefore, nascent hydrogen is more reactive than molecular hydrogen simply because nascent hydrogen is more reactive than molecular hydrogen.

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An engineer need to introduce heat pump systems when designing a heating/cooling system for a home in a cooler or warmer climate.

For all climates, heat pumps provide a more energy-efficient furnace and air conditioner replacement. Heat pumps, like your refrigerator, use power to move heat from a cold space to a warm space, warming the warm space and making the cool space cooler. Therefore, an engineer may introduce heat pump systems while designing a house in any kind of climate.

In the winter, heat pumps transfer heat from the chilly outside to your comfortable home. In the summer, heat pumps transfer heat from your home to the outside.

Heat pumps can effectively supply your home with acceptable temperatures since they transfer heat rather than producing it.

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Answer:

electrons.

Answer:

Hamburger

Explanation:

In IR spectroscopy, vibrational frequency is directly proportional to the energy of the vibrational mode, which in turn is proportional to the strength of the chemical bond and the masses of the atoms involved in the bond.

In infrared (IR) spectroscopy, vibrational frequency is directly proportional to the energy of the vibrational mode. Specifically, the vibrational frequency of a molecule is directly proportional to the strength of the chemical bond and the masses of the atoms involved in the bond. As the vibrational frequency increases, the energy of the bond also increases. This is because the bond becomes stiffer and requires more energy to vibrate. Therefore, IR spectroscopy can be used to identify the types of chemical bonds present in a molecule by measuring the vibrational frequencies of the bonds.

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Answer:

When you mix silver nitrate and hydrochloric acid it is a chemical

change.

Explanation:

Physical change: You are changing the form of a chemical substance, but not, chemical composition.

- Physical changes are used to separate mixtures into their component compounds, but cannot usually be used to separate compounds into chemical elements or simple compounds.

Chemical Change: Occurs when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances.

- These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

When you mix silver nitrate and hydrochloric acid it is a chemical change.

Physical changes are changes which affecting the form of chemical substances but not it's chemical composition. Physical change are the processes in which we can separate mixture from compound, but can't usually be used to separate compound into chemical elements or simplest compound.

Physical change takes place when mixture are can't separate by chemical changes then we separate by the help of physical change. In general a physical change is reversible using physical means.

Silver is a shiny metal that conducts electricity very well . It can be molded into thin sheets it means it can spread into a like a sheet and these type of properties is known as malleability.

Potassium is dull and brittle it means that it can't be change into sheet when you try to change in sheet it will break and these properties are called as brittlness. And when it is has been dissolved into water, which it does quite easily. Physical properties of matter include color, hardness, malleability, solubility, electrical conductivity, density, melting points and boling points.

Therefore, When you mix silver nitrate and hydrochloric acid it is a chemical change.

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Answer:

An object's thermal energy is dependent upon its temperature and mass. The higher the temperature of a given quantity of a substance, more is its thermal energy. Similarly, for the same temperature, higher mass of a substance will contain more thermal energy

Answer:

n=mass/molar mass

mass=?,molar mass=12+(35.5)4=154g/mol.n=4.63x10²

mass=4.63x10²x154=7128g

ZnS is the chemical formula of the  zinc sulphide. Zinc sulphide contain two ions i.e. ( Zn ⁺² ) and ( S ⁻² ) ion present in zinc sulphide.

A Bronsted - Lowry acid or Lewis acid is a molecule or ion that has the ability to donate a proton or establish a covalent bond with an electron pair. Proton donors, also known as Bronsted - Lowry acids, are the first class of acids.

Any hydrogen containing material that has the ability to donate a proton (hydrogen ion) to another chemical is considered an acid. A base is a molecule or ion that can take up an acid's hydrogen ion. Typically, sour tastes help to identify acidic chemicals.

Thus, ZnS is the chemical formula of the  zinc sulphide. Zinc sulphide contain two ions i.e. ( Zn ⁺² ) and ( S ⁻² ) ion present in zinc sulphide.

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Answer:

C

Explanation:

Take my word.

Hope this helped.

Answer:

C: It revolves around the sun and is much smaller than a planet.

Explanation:

An asteroid is a rocky or metallic object that orbits, revolves around, the Sun and is much smaller than a planet. - Trust your Teacher here.

Answer:

2180 g Cu(OH)₂

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

22.3 mol Cu(OH)₂

Step 2: Identify Conversions

Molar Mass of Cu - 63.55 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H - 1.01 g/mol

Molar Mass of Cu(OH)₂ - 63.55 + 2(16.00) + 2(1.01) = 97.57 g/mol

Step 3: Convert

\(22.3 \ mol \ Cu(OH)_2(\frac{97.57 \ g \ Cu(OH)_2}{1 \ mol \ Cu(OH)_2} )\) = 2175.81 g Cu(OH)₂

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

2175.81 g Cu(OH)₂ ≈ 2180 g Cu(OH)₂

The concentration of A after 30 seconds when the given reaction obeys the rate law rate = k[A]²[B].

We use the initial concentration of A and B and the rate constant of the reaction to find the rates at these concentrations. Using the integrated rate law for a second-order reaction, we find the concentration of A after 30 seconds to be 0.0934 M.

Given reaction obeys the rate law, rate=k[A]²[B].

Here, the initial concentration of A= 0.10 M,

initial concentration of B = 0.05 M, and

rate constant, k = 2.0 × 10⁻⁴ M⁻¹s⁻¹

We have to find the concentration of A, after 30 seconds.

To find the concentration of A, we need to know the rate at 0.10 M and 0.05 M. Therefore, we have to calculate the rates at these concentrations.

rate1 = k[A]²[B]

= (2.0 × 10⁻⁴ M⁻¹s⁻¹)(0.10 M)²(0.05 M)

= 1.0 × 10⁻⁷ M/srate2

= k[A]²[B] = (2.0 × 10⁻⁴ M⁻¹s⁻¹)(0.09 M)²(0.04 M)

= 6.48 × 10⁻⁸ M/s

Using the integrated rate law for a second-order reaction: [A] = [A]₀ - kt where [A]₀ = initial concentration of A, k = rate constant, and t = time in seconds.

We know [A]₀ = 0.10 M and k = 2.0 × 10⁻⁴ M⁻¹s⁻¹.

Substituting the values in the above equation, we get: [A] = [A]₀ - kt= 0.10 M - (2.0 × 10⁻⁴ M⁻¹s⁻¹)(30 s)≈ 0.0934 M

Therefore, the concentration of A in the vessel after 30 seconds is 0.0934 M.

This question requires us to calculate the concentration of A after 30 seconds when the given reaction obeys the rate law rate = k[A]²[B].

We are given the initial concentration of A and B and the rate constant of the reaction. To find the concentration of A after 30 seconds, we need to calculate the rates at the initial concentrations of A and B.

Using the integrated rate law for a second-order reaction, we can find the concentration of A at any given time. We substitute the given values in the formula and solve for [A]. We get the concentration of A as 0.0934 M after 30 seconds. This calculation is based on the assumption that no other reaction is important.

The concentration of A after 30 seconds when the given reaction obeys the rate law rate = k[A]²[B]. We use the initial concentration of A and B and the rate constant of the reaction to find the rates at these concentrations. Using the integrated rate law for a second-order reaction, we find the concentration of A after 30 seconds to be 0.0934 M. This calculation assumes that no other reaction is important.

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Step-by-step Explanation:

a. \(CaCO_{3}\) → \(CaO\) + \(CO_{2}\)

This is the balanced chemical equation for the combustion of Calcium carbonate.

b. Properties of \(CaCO_{3}\) :

   Properties of \(CaO\) :

   Properties of \(CO_{2}\) :

c. According the above equation, number of atoms on both sides are equal.

Before reaction: Ca = 1, C = 1, O = 3

After reaction: Ca = 1, C = 1, O = 1 + 2 = 3

d. The law of conservation of matter states that the total mass and kind of elements in the reactants is equal to the total mass and kind of elements in the products. Thus matter cannot be created not destroyed, it can only be conserved. From the chemical equation, we get to know that the mass and number of atoms of all the elements is equal in the reactants and products. Thus we can prove the conservation of matter.

e. Combustion of Sodium Carbonate:

\(Na_{2} CO_{3}\) → \(Na_{2}O + CO_{2}\)

In this reaction, sodium carbonate undergoes combustion at temperature > 500°C and forms sodium oxide and carbon dioxide.

f. The following results are achieved when a chemical reaction occurs:

Water and calcium oxide react quickly to form calcium hydroxide. A significant amount of heat is also released during this process, raising the system's temperature. This demonstrates that there was a chemical reaction.

Calcium carbonate breaks down into calcium oxide and carbon dioxide when heated. Here, the evolution of gas (carbon dioxide) proves that a chemical reaction has occurred.

Answer:

\(MgO _{(s)} + 2H {}^{ + } _{(aq)} = Mg {}^{2 + } _{(aq)}+ H _{2} O _{(l)} \\ \)

The new volume of the balloon should be approximately 716.92 cm^3.

To find the new volume of the balloon, we can use the ideal gas law formula:

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

Since the pressure is constant,

we can rewrite the formula as V1/T1 = V2/T2, where V1 is the initial volume, T1 is the initial temperature, V2 is the new volume we want to find, and T2 is the new temperature.

Given:
V1 = 456 cm^3
T1 = 255 K
T2 = 400 K

We can rearrange the formula to solve for V2:
V2 = V1 * (T2 / T1)

Substituting the given values, we have:
V2 = 456 cm^3 * (400 K / 255 K)

Calculating this expression:
V2 ≈ 456 cm^3 * 1.57

Therefore, the new volume of the balloon should be approximately 716.92 cm^3.

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A substance that contains a hydrogen atom and can be given as a hydrogen ion in an aqueous solution is considered an acid, according to the Arrhenius hypothesis. Arrhenius acids are the name given to such compounds.

According to Arrhenius: Acid: Acids are those substances that, when dissolved in water, produce H+ ions. Base: Bases are compounds that, when dissolved in water, give off OH ions.

According to the Bronsted-Lowry definition, an acid is a substance that contributes protons to the formation of a bond or takes a pair of valence electrons. (in the Lewis definition).

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Question:

Which term describes an acid according to the Arrhenius acid-base theory?

Aluminum is solid at room temperature and will, therefore, have a melting point that is above room temperature.

The room temperature is about 25 degrees Celsius.

Argon and oxygen are gases at room temperature.

Mercury is a liquid at room temperature.

Aluminum, on the other hand, is solid at room temperature. Hence, its melting point is definitely somewhere above room temperature.

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The heat required to raise the temperature of 8.75 g of water from its melting point to its boiling points is 3.662 kJ.

The amount of heat required to increase the temperature of one gram of a material by one degree Celsius (°C) is defined as specific heat.

The equation q = mcΔt can be used to compute the amount of heat acquired or lost by a specific heat (q), where m is the mass of the sample, c is the specific heat, and Δt is the temperature change.

Given:

m = 8.75

c = 4.186 J/g°C

The melting point and boiling point of water is 0° and 100° respectively.

Δt = 100° - 0° = 100°

We know that,

q = mcΔt

  = 8.75(4.186)100

  = 3.662 kJ

Thus, the heat required to raise the temperature of 8.75 g of water from its melting point to its boiling points is 3.662 kJ.

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Answer:

+2.5

Explanation:

So the oxidation number of S in Na2S4O6is +2.5.

Answer:

Explanation:

Oxidation number of Na = 1+   There are two of them, so it is 2*1 = 2

Oxidation number of O =  2-    There are 6 of them so 6 * 2-    =  -12

There are 4 S's so the oxidation number is 4*S

Now set up a small equation

2 + 4s - 12 = 0

And solve.

2 - 12 + 4s =0

-10 + 4s =   0

4s = 10

4s/4 =10/4

s = 2.5

Answer

0.1

Explanation

Given:

mass of HCl = 0.915g

volume of HCl = 250 mL

We know the molar mass of HCl = 36,458 g/mol

Solution

Step 1: covert the volume from mL to L

1 mL = 0.001 L

therefore 250 mL = 0.25 L

Step 2: Calculate the number of moles of HCl

n = m/M where n is the moles, m is the mass and M is the molar mass

n = 0.915 g/36,458 g/mol

n = 0.025 mol

Step 3: Calculate the molarity

C = n/V where C is the molarity, n is the moles and V is the volume

C = 0.025 mol/0.25 L

C = 0.1

Answer: The hydronium \((H_{3}O^{+})\) concentration of a solution with a pH of 3.60 is 0.56 M.

Explanation:

pH of a substance is the negative logarithm of concentration of hydrogen ions present in it.

It's formula is; pH = - log \([H^{+}]\)

When pH of a solution is 3.60 then its hydronium or hydrogen ion concentration is calculated as follows.

\(pH = - log [H^{+}]\\3.6 = - log [H^{+}]\\concentration of H^{+} = antilog (-3.6)\\= 0.56\)

Thus, we can conclude that the hydronium \((H_{3}O^{+})\) concentration of a solution with a pH of 3.60 is 0.56 M.

C. physical change

Explanation:

That's the answer

The energy produced by the sun is as a result of nuclear reactions which produces large amounts of energy.

Chemical reactions are reactions which occur as a result of a rearrangement of atoms of elements to form new combinations of substances known as compounds.

Since chemical reactions which have relatively short lifespans, scientist would have assumed that the sun is very young.

However, nuclear reactions have been proven to be the means by which the sun produces its energy.

Nuclear reactions release large amounts of energy and have relatively long lifespans.

Therefore, the energy produced by the sun is as a result of nuclear reactions.

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Answer:

It’s 3

Explanation: