3. A substance which is made up of two are more different
elements chemically combined is known as

A. an atom
B. a substance
C. a compound
D. a molecule

Answer:

Water is a remarkable substance, and its unique properties are largely due to the presence of polar covalent bonds and hydrogen bonds in its structure. These characteristics play a crucial role in the physical and chemical properties of water, making it essential for life as we know it.

Explanation:

The polar covalent bonds in water arise from the unequal sharing of electrons between oxygen and hydrogen atoms. This results in the oxygen atom having a partial negative charge (δ-) and the hydrogen atoms having partial positive charges (δ+). These charges create polarity within the water molecule, leading to the formation of hydrogen bonds.

Hydrogen bonds occur when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds are relatively weak individually, but when present in large numbers, they contribute to the cohesion, surface tension, and high boiling point of water.

The importance of these bonds is manifold. The cohesion between water molecules due to hydrogen bonding enables water to form droplets, have a high surface tension, and flow freely, facilitating transport within organisms and in the environment. Additionally, hydrogen bonding leads to the high specific heat capacity and heat of vaporization of water, making it an effective regulator of temperature in living organisms and ensuring stable environmental conditions.

Furthermore, hydrogen bonds play a crucial role in the unique properties of water as a solvent. The polar nature of water allows it to dissolve a wide range of substances, including ionic compounds and polar molecules, facilitating various biological processes such as nutrient transport and chemical reactions in cells.

V2 + 2NO → 2H2O + N2 The equation is balanced by adding an additional coefficient (2) to the hydrogen (H2) and water (H2O) molecules on the product side.

Balanced is a term used to describe a state of equilibrium or harmony. It implies a situation where all elements are in proportion and none are out of place or dominant. This could describe a healthy diet that provides a balance of proteins, carbohydrates, and fats, or a successful family life where time is shared between work, play, and private activities. Balance is also a key factor in physical and mental health, when all aspects of life are in alignment it allows for a more fulfilling and enjoyable experience.

This ensures that the number of atoms of each element is equal on both sides of the equation. In other words, the number of atoms of hydrogen (H2) and water (H2O) molecules on the left side of the equation must be equal to the number of atoms of hydrogen (H2) and water (H2O) molecules on the right side of the equation.

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Rutherford's model of atom could not explain chemical properties as it did not make any mention as to how chemical changes take place.

These properties are defined as those properties which become evident during or after a chemical reaction after the identity of the substance is changed during chemical reaction.

These properties cannot be determined externally just by viewing the substance ,these change immensely after a substance undergoes a chemical change.These are used for identification of unknown substances and for building up chemical classifications.

The major chemical properties are flammability,toxicity,reactivity,acidity and heat of combustion.For a chemical property to be apparent , it is necessary that the structure of the substance is altered.

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Explanation:

i cant see the picture!!!

Answer:

43% oxygen, 20% silicon, 19% magnesium, 10% iron, 3% calcium, 3% aluminum, 0.42% chromium, 0.18% titanium and 0.12% manganese. Orbiting spacecraft have found traces of water on the lunar surface that may have originated from deep underground.

Answer: Physical properties

Explanation: Can be measured without changing a substance's chemical identity.

(a) The main inorganic carbon system reactions in seawater involve the transfer of CO2 from the air phase into the water phase. The associated chemical equilibrium equations are as follows:

CO2 (aq) + H2O ↔ H2CO3 ↔ HCO3- + H+ ↔ CO32- + 2H+

CO2 (aq) is the dissolved CO2 in the water phase, H2CO3 is the carbonic acid, HCO3- is the bicarbonate ion, H+ is the hydrogen ion, and CO32- is the carbonate ion.

(b) Manipulation of the chemical equilibrium equations yields the following expressions for [HCO3-] and [CO32-] as a function of pCO2 and [H+] only:

[HCO3-] = K1*pCO2/[H+]

[CO32-] = K2*K1*pCO2/[H+]2

Where K1 and K2 are the carbonic acid and bicarbonate ion dissociation constants, respectively.

(c) If pH were to decrease while pCO2 remained the same, [HCO3-] would decrease more than [CO32-]. This is because the equation for [HCO3-] is directly proportional to [H+], whereas the equation for [CO32-] is inversely proportional to [H+]. As pH decreases, [H+] increases, so [HCO3-] decreases more drastically than [CO32-].

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The atomic number of an isotope of tellurium that has 71 neutrons is 52.

The atomic number of an element is the number of protons in an atom of that element.

The number of protons in an atom can be got by subtracting the mass number of an element from the number of neutrons.

According to this question, one isotope of tellurium, tellurium-123, has 71 neutrons. The atomic number or proton number can be calculated thus;

atomic number = 123 - 71

atomic number = 52

Therefore, the atomic number of an isotope of tellurium that has 71 neutrons is 52.

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Answer:

Explanation:l do not no the answer

8.22 g ca (no3) Enough water is used to dissolve 2 to create a 0.250 l solution.

The solution's molarity is 0.050/0.250 M, or 0.2 M.

How is Molar concentration is defined?

The term "molar concentration" is used to define the concentration of a chemical species, specifically a solute, in a solution. It denotes the quantity of a substance per unit volume of solution. Other synonyms for this phrase include quantity, substance concentration, and molarity.

M = n/V

where,  n = no of moles of solute

V = volume of solution

and, M = molarity of the solution.

Molecular weight of Ca(NO3)2 = 164g = 1 mole pf calcium nitrate

Thus, 8.22 g  Ca(NO3)2 = 8.22/164 moles. = 0.050 mole

Volume(given) = 0.250l

Therefore, Molarity of the given solution = 0.050/0.250 M = 0.2 M

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The mass of the precipitate is 1.08 g and the precipitate is barium carbonate.

In chemical calculations, such as figuring out the stoichiometry of reactions, figuring out concentrations, and converting between different units of measurement, the idea of moles is crucial.

Number of moles of the barium chloride = 55/1000 L * 0.1

= 0.0055 moles

Number of moles of sodium carbonate = 40/1000 L * 0.15

= 0.006 moles

Given that the reaction is 1:1, the limiting reactant is barium chloride

Number of moles of the barium carbonate precipitate =  0.0055 moles * 197 g/mol

= 1.08 g

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The binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond.  Option b

Aminoacyl-tRNA is a complex molecule that plays a crucial role in protein synthesis. It consists of a tRNA molecule covalently linked to an amino acid. The amino acid is attached to the 3' end of the tRNA molecule through an ester bond.

An ester bond is formed between the carboxyl group (-COOH) of the amino acid and the hydroxyl group (-OH) of the ribose sugar at the 3' end of the tRNA molecule. This ester bond is also referred to as an ester linkage. The formation of the ester bond is catalyzed by the enzyme aminoacyl-tRNA synthetase.

The ester bond in aminoacyl-tRNA is essential for protein synthesis. During translation, the aminoacyl-tRNA molecule carries the specific amino acid to the ribosome, where it is incorporated into the growing polypeptide chain. The ester bond is later hydrolyzed, releasing the amino acid for further use in protein synthesis.

In summary, the binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond between the carboxyl group of the amino acid and the hydroxyl group of the ribose sugar in the tRNA molecule.

Option b

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Answer:

Agree

Explanation:

Answer:

Agree

Explanation:

1. Fluid compressibility (C): Fluid compressibility refers to the measure of how much a fluid's volume changes in response to a change in pressure.

2. Solution-gas/liquid ratio (SGLR): The solution-gas/liquid ratio represents the volume of gas dissolved in a given volume of liquid at a specific pressure and temperature.

3. Fluid formation volume factor (FVF): The fluid formation volume factor represents the ratio of the volume of a fluid at reservoir conditions (pressure and temperature) to its volume at surface conditions.

4. Fluid densities (ρ): Fluid densities refer to the mass per unit volume of a fluid.

5. Fluid viscosities (μ): Fluid viscosities represent the measure of a fluid's resistance to flow.

1.  Equation: C = -1/V * dV/dP

  Symbol: C

  Unit: 1/Pascal (Pa^-1)

  Correlation: The compressibility of fluids can vary depending on the fluid type. For ideal gases, the compressibility is inversely proportional to pressure.

2.Equation: SGLR = V_gas / V_liquid

  Symbol: SGLR

  Unit: Volumetric ratio (e.g., scf/bbl)

  Correlation: The solution-gas/liquid ratio is influenced by the pressure and temperature conditions, as well as the composition of the fluid.

3. Equation: FVF = V_reservoir / V_surface

  Symbol: FVF

  Unit: Volumetric ratio (e.g., bbl/STB)

  Correlation: The fluid formation volume factor depends on the composition and properties of the fluid, as well as the reservoir conditions.

4. Equation: ρ = m / V

  Symbol: ρ

  Unit: Mass per unit volume (e.g., kg/m^3)

  Correlation: Fluid densities can vary depending on the type and composition of the fluid. For example, water has a density of approximately 1000 kg/m^3.

5. Equation: No single equation; viscosity is measured experimentally using viscometers.

  Symbol: μ

  Unit: Pascal-second (Pa·s) or centipoise (cP)

  Correlation: The viscosity of a fluid is influenced by temperature and pressure. Different fluids exhibit different viscosities, ranging from low-viscosity fluids like water to high-viscosity fluids like heavy oil.

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The total number of valence electrons in one molecule of N2O3 is 24.

Nitrogen (N) and Oxygen (O) are both nonmetals with varying numbers of valence electrons.

So, you need to find out the number of valence electrons for each atom in N2O3.

Valence electrons of each atom: N = 5 valence electrons O = 6 valence electrons

So, for N2O3:

         N2O3 has two nitrogen atoms (2 x 5 valence electrons) + three oxygen atoms (3 x 6 valence electrons)

                        = 10 + 18 = 28 valence electrons

The total number of valence electrons in one molecule of N2O3 is 28.

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In the above question the probability the electron will tunnel through the barrier is 0.011%.

An electron volt is the amount of energy required to move a charge equal to 1e⁻ across a potential difference of 1eV.

To calculate the probability the electron will tunnel through the barrier is calculated as -

Energy of electron

E=80eV

=80×1.6×10⁻¹⁹

=128×10⁻¹⁹

Height of the barrier U=100 eV

=100×1.6×10⁻¹⁹J

Thickness L=0.2×10⁻⁹m

Probability T=e⁻²cl

C=√2m(U-E)/h

=√[2×1.67×10⁻²⁷(160-128)×10⁻¹⁹] / 1.055×10⁻³⁴

=10.34×10⁻²³/1.055×10⁻³⁴

=9.8×10¹¹

2CL=2×9.8×10¹¹×0.2×10⁻⁹

=3.92×10²

T=e⁻²cl

= 1/e⁻³⁹²/¹⁰⁰⁰⁰

=0.0198%

=0.011%

Hence ,the probability the electron will tunnel through the barrier is 0.011%.

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Answer:

How far away the objects are from each other

Answer: properties

Explanation:

The element which has the properties

Mallablity

Ductility

Lusterous

High electric. Conductivity

High tensile strength is said to be metal.

Answer:

When water becomes a solid, it releases heat, warming up its surroundings. This makes freezing an exothermic reaction

Explanation: i think

Answer:

Explanation:

The mass of the volleyball can be found by using the formula

\(m = \frac{f}{a} \\ \)

f is the force

a is the acceleration

From the question we have

\(m = \frac{7}{10} = 0.7 \\ \)

We have the final answer as

Hope this helps you

The solution has a molarity of one when one gram of solute dissolves in one liter of solution. The total volume of the solution is determined because the solvent and solute combine to form a solution. Here the moles of NaOH is  0.1125 moles.

The molarity of a specific solution is defined as the total number of moles of solute per liter of solution. Molarity is denoted by the letter M, also known as a molar.

The ratio of the moles of the solute whose molarity needs to be calculated is multiplied by the volume of solvent needed to dissolve the supplied solute.

M = Number of moles  / Volume in liters

n = molarity × Volume in liters

450.0 mL = 0.45 L

n = 0.250 × 0.45 = 0.1125 moles

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The total heat that is required to produce the solid  is obtained as 34.8 kJ.

We know that the energy of the substance can be defined as the ability to do work. In this case, energy has been supplied to the system as the heat that is supplied to the substances.

There are stages that the objects would have to go through and in all these stages we have heat that is evolved or absorbed.

As the object cools from  120.9 °C to  87.9 °C

H = mcdT

m = mass of the object

c = specific heat capacity

dT = temperature change

H = 221.6 g *  1.5 J/g·°C * (87.9 °C - 120.9 °C)

H = -10,969 J or 10.969 kJ

As it is converted from gas to liquid;

H = 221.6 g/75 g/mol * 34.6 kJ/mol

H = 2.95 mol *  34.6 kJ/mol

H = 102.1 kJ

As the liquid cools from 87.9 °C to  -30.9 °C

H = 221.6 g * 2.4 J/g·°C * ( -30.9 °C - 87.9 °C)

H = -63.2 kJ

As the liquid changes to solid;

H =  221.6 g/75 g/mol * 6.3 kJ/mol

H = 2.95 mol * 6.3 kJ/mol

H = 18.6 kJ

As the solid cools further to  -61.9°C

H = 221.6 g * 4.9 J/g·°C * (-61.9°C - (-30.9 °C))

H = -33.7 kJ

Total heat involved;

10.969 kJ + 102.1 kJ - 63.2 kJ + 18.6 kJ - 33.7 kJ

= 34.8 kJ

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Answer:

can be drawn into wires.

Explanation:

A material is said to be ductile if it can be drawn into wires. Metals, for example, are very ductile as compared to non-metals. These wires are generally used for conducting electricity.

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There are completely ( 12 + 22 + 11 = 45 ) elements .

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(( C )) percentage :

\( \frac{12}{45} \times 100 = \frac{4}{15} \times 100 = 26.666 \: \: percent \\ \)

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(( H )) percentage :

\( \frac{22}{45} \times 100 = 48.888 \: \: percent \\ \)

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(( O )) percentage :

\( \frac{11}{45} \times 100 = 24.444 \: \: percetage \\ \)

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The amount of copper deposited is 0.1778 grams.

The electrolysis reaction for CuSO₄ solution

Copper deposits will occur at the cathode. According to Faraday's law the number of moles of an electron

ne = It ÷ 96,500

ne = (0.450 × 1,200) ÷ 96,500

ne = 540 ÷ 96,500

ne = 5.6 × 10⁻³ mol

The ratio of the coefficients of each element is equal to the ratio of the number of moles.

ne : n Cu = 2 : 1

n Cu = ne ÷ 2

n Cu = (5.6 × 10⁻³) ÷ 2

n Cu = 2.8 × 10⁻³ mol

Calculate the amount of copper

The molar mass for copper = 63.5

m = n × molar mass

m = 2.8 × 10⁻³ × 63.5

m = 0.1778 grams

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Answer:

c or d

Explanation:

it says it was playing classic music

In this case, the control group or control variable is the greenhouse where the plants are grown in silence, as this group does not receive any music treatment. Therefore, the correct answer is A.

Variables can be defined as any characteristics, number or a quantity that can be measured . It is also  called as a data item . It is called as variable because it can vary and can also have  wide variety of values.

There are 3 types of variables 1) manipulated variable where the condition is specified, 2) responding variable which is dependent on the manipulated variable 3)controlled variable which does not change.

In this experiment, the control group is the group that does not receive the experimental treatment and serves as a basis for comparison.

Thus, the correct answer is A , the silent greenhouse.

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Answer:

gold

Explanation: