What is the GCF of 18 and 30

Answer:The pressure exerted by the gas is 100kPa

Explanation:Let's apply the Charles Gay Lussac law, to solve the question.

At constant volume, the pressure varies proportionally with the temperature.

P initial / T° initial = P final / T° final

50kPa / 20°C = P final / 40°C

Temperature has increased the double, so the pressure will be increased, the double too.

100 kPa

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Answer:

A.) If the temperature increases, then crickets will chirp more.

Explanation:

The hypothesis is a testable statement that can be supported or disproved through experimentation.

A.) is correct. This statement clearly identifies what will (supposedly) happen when a variable is manipulated. Once an experiment is carried out, this hypothesis can be supported or negated.

B.) is incorrect. This is an opinion, not an objective statement. This statement is subjective and cannot be backed by evidence.

C.) is incorrect. Hypotheses are not questions. This statement also does not state how temperature could affect a cricket's chirp. However, questions can often lead to the formation of a hypothesis.

D.) is incorrect. The first part of the statement is an observation, and the second part is an assumption. Like in answer C, this information can be used as the basis in making a hypothesis.

The mass of hydrogen produced in the reaction is 2g.

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Given,

Mass of Zn = 65g

Mass of HCl = 72g

Moles of Zn = mass / molar mass

= 65 / 65 = 1 mole

Moles of HCl = 72 / 36.5

= 1.97 moles

Since moles of Zn is lesser, therefore it is the limiting reagent.

From the reaction, 1 mole of Zn gives 1 mole of hydrogen

Moles of hydrogen = 1 mole

mass of hydrogen = moles × molar mass

= 1 × 2 = 2g

Therefore, the mass of hydrogen produced in the reaction is 2g.

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55.03 moles of KCI are produced when 6743 grams of \(KClO_{3}\) decomposes

To determine the number of moles of KCl produced when 6743 grams of \(KClO_{3}\) decomposes, we need to use the concept of molar mass and the balanced chemical equation.

First, let's calculate the molar mass of \(KClO_{3}\)

The molar mass of potassium (K) is approximately 39.10 g/mol.

The molar mass of chlorine (Cl) is approximately 35.45 g/mol.

The molar mass of oxygen (O) is approximately 16.00 g/mol.

So, the molar mass of \(KClO_{3}\) is:

(39.10 g/mol) + (35.45 g/mol) + (3 * 16.00 g/mol) = 122.55 g/mol.

Now, we need to calculate the number of moles of \(KClO_{3}\):

Number of moles = Mass / Molar mass

Number of moles = 6743 g / 122.55 g/mol = 55.03 mol.

According to the balanced chemical equation:

2\(KClO_{3}\) -> 2 KCl + 3 O2,

we can see that for every 2 moles of \(KClO_{3}\), we obtain 2 moles of KCl.

Therefore, the number of moles of KCl produced will be equal to the number of moles of \(KClO_{3}\) since the ratio is 1:1. Thus, 55.03 moles of KCl will be produced.

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Answer:

Al2o3 is 101

(nh4)2O IS 52

S8 is 256.56

Ba(oh)2 is 171.35

Cacl2 is 110.98

H2O is 18.01

Explanation:

A dam constructed to produce tidal power does so by harnessing water flow to drive turbines and electric generators .

Tidal energy was employed in grain mills to crush grains mechanically, just like wind energy was. grain crushing Here, the tidal energy generated by the turbines was used. Hydroelectric dams, which serve as significant energy storage, also employ tidal energy to store energy.

Tidal power can harm marine life because tidal turbines' whirling blades can cause marine organisms to perish. Fish habitations in tidal power settings may be impacted by noise from the turbines' rotation. Tidal energy can also affect how sediment and water are processed.

Therefore, option B is correct.

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Carbon atoms may thus form bonds to as many as four other atoms. For example, in methane (CH 4​start subscript, 4, end subscript), carbon forms covalent bonds with four hydrogen atoms

__________________________________________________________

Explanation:

To solve this kind of problem we usually use the ideal gas law. The formula is:

P * V = n * R * T

Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, T is the temperature. R is 0.082 atm*L/(mol*K), so we have to convert the temperature from °C to K and the pressure from mmHg to atm before solving the formula.

R = 0.082 atm*L/(mol*K)

V = 0.500 L

T(K) = T(°C) + 273.15 K

T(K) = 250 + 273.15 K

T(K) = 523.15 K

760 mmHg = 1 atm

P = 170 mmHg * 1 atm/(760 mmHg)

P = 0.224 atm

Now we can replace those values and solve the formula for the number of moles.

P * V = n * R * T

n = P * V/(R*T)

n = 0.224 atm * 0.500 L/(0.082 atm*L/(mol*K) * 523.15 K)

n = 0.00261 mol

Answer: There are 0.00261 mol in the sample.

If the temperature is 25 °C.

T = (273.15 + 25) K

T = 298.15 K

n = 0.224 atm * 0.500 L/(0.082 atm*L/(mol*K) * 298.15 K)

n = 0.00457 mol

Answer: There are 0.00457 mol in the sample.

The descending order of the strength of the conjugate bases of the given acids is as follows:

Conjugate bases are substances formed when an acid donates its proton.

The strength of the conjugate bases formed from an acid is the inverse of the acid dissociation constant, Ka, of the acid.

The acid dissociation constant, Ka, of the given acid are given below:

The acid dissociation constant, Ka, of hypobromous acid, HBrO, is 2.3 * 10⁻⁹

The acid dissociation constant, Ka, of trioxonitrate (v) acid, HNO₃ is 2.4 * 10¹

The acid dissociation constant, Ka, of water, H₂O, is 1.8 x 10⁻¹⁶

The acid dissociation constant, Ka, of Hypochlorous acid, HClO, is 3.0 x 10⁻⁸

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The thinner and denser layer labelled "2" in the diagram represents the marine crust, while the thicker and less dense layer labelled "1" represents the continental crust. Therefore, A. 1; 2 is the right response.

The land on Earth is made up of the continental crust, which is less dense, thicker (between 35 and 70 km), and primarily composed of the rock granite. The majority of the ocean is made up of oceanic crust, which is denser, thinner (5–7 km), and primarily composed of the rock basalt.

With a density of around 2.7 grammes per cubic cm, continental crust has a largely granitic composition and is slightly lighter than Oceanic crust has a density of roughly 2.9 to 3 grammes per cubic centimetre and is composed of basalt, which is richer in iron and magnesium than granite.

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As per the standard data, the heat evolved during one mole of calcium carbonate decomposes is 177.8 KJ. Thus 15 g or 0.15 moles of calcium carbonate when decomposed will produce 26.67 KJ of heat.

Reaction enthalpy of a substance is the heat evolved or absorbed during a reaction. Reaction enthalpy is negative for an exothermic reaction and positive for an endothermic reaction.

Molar mass of calcium carbonate = 100 g.

no.of moles in 15 g = 15 /100 = 0.15 moles.

One mole or 100 g of calcium carbonate decompose to evolve 177.8 KJ according to the scientific record.

Thus, heat evolved by the decomposition of 0.15 moles is 0.15 × 177.8 KJ = 26.67 KJ.

Hence, the heat evolved during the decomposition of 15 g of calcium carbonate is 26.67 KJ.

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Answer:

96.99 C degree change

Explanation:

  480 cal  / ( 150 g * .033 cal/g-C )  = 96.99 C

The formula for lithium hydrogen phosphate is Li2HPO4.

What is lithium hydrogen phosphate (Li2HPO4)?

Lithium hydrogen phosphate (Li2HPO4) is a chemical compound that contains the elements lithium, hydrogen, phosphorus, and oxygen. It is an ionic compound and a salt of phosphoric acid.

Lithium hydrogen phosphate is commonly used in the production of lithium-ion batteries and as a source of lithium ions in chemical reactions. It is also used in the synthesis of various other lithium compounds. In addition, lithium hydrogen phosphate has potential applications in the field of biomedical engineering as a material for bone tissue engineering and drug delivery.

What is an ionic compound?

An ionic compound is a type of chemical compound formed by the combination of positively charged ions (called cations) and negatively charged ions (called anions) through electrostatic attraction. The cations and anions are held together by ionic bonds, which are formed by the transfer of electrons from the cation to the anion. Ionic compounds are typically solids at room temperature and have high melting and boiling points. Examples of ionic compounds include sodium chloride (NaCl), magnesium oxide (MgO), and calcium carbonate (CaCO3).

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Answer:

C. i don't kow

Explanation:

Answer:

answers

Explanation:

1a)a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure.

1b)a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction

1c)all existing matter and space considered as a whole

2)tick the first box

3)milky way

4)This is caused by Earth's orbit around our Sun.

5)star,planet,galaxy,universe

6)star-Stars are astronomical objects, that emit their own light, produced due to thermonuclear fusion, occurring at its core

Stars can form orbital systems with other astronomical objects, as in the case of planetary systems and star systems with two or more stars.

6 ii)A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion,

Planets refer to the celestial object that has a fixed path (orbit).They do not have their own light.

7)ten thousand km

Answer:

1. A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived outline or pattern, typically repesenting an animal, mythological person or creature, or an inanimate object.

B. A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems.

C. The universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.

2. 1st photo

3. Our galaxy is called Milky Way galaxy.

6. Stars are the astronomical objects, that emit their own light, produced due to thermonuclear fusion, occurring at its core. Planets refers to the celestial object that has a fixed path (orbit), in which it moves around the star. They have their own light. They do not have their own light.

7. Ten thousand km

Answer:

Find alternatives to fossil fuels

Explanation:

The most effective long - term solution to reduce the amount of carbon dioxide emission is to find alternatives to fossil fuels.

Fossil fuels consumption and use in most industrial processes are some of the leading causes of huge carbon signatures in the atmosphere.

Answer:

The three components of a chemical formula are the empirical formula, the molecular formula, and the structural formula.Hope this answer helps.

Answer:

kindly give options

Explanation:

The compound would have a molecular formula of C5H10O2.

The empirical formulas is the simplest formula of a compound.

We know that;

Mass  of the carbon = 14.03 * 12/44 = 3.82 g

Moles of C = 3.82 g/12 g/mol = 0.32 moles

Mass of water = 3.83 * 2/18 = 0.43 g

Moles of H =  0.43 g/1 g/mol =  0.43  moles

Mass of oxygen = 8.5 - (3.82 + 0.43)

= 4.25 g

Moles of oxygen = 4.25 g/16 g/mol = 0.27 moles

We can now divide through by the lowest ratio;

C - 0.32    H - 0.43    O - 0.27

C - 1   H - 2  O - 1

The empirical formula is CH2O

The molecular formula is;

[12 + 2+ 16]n = 160

n = 160/30

n = 5

The molecular formula is;

C5H10O2

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Answer:

A scale shows colors from red to purple with labels from the red end of 0, 1 gastric acid, 2 lemon juice, 3 orange juice, 4 tomato juice, 5 black coffee, 6 urine, 7 distilled water, 8 sea water, 9 baking soda, 10 milk of magnesia, 11 ammonia, 12 soapy water, 13 bleach, 14.

Familiar solutions can have a wide range of pH levels.

According to the chart, which is the strongest acid, based on its pH level?

✔ gastric acid

Lemon juice has approximately how many more times the H+ ions than tomato juice?

✔ one hundred times

Which has the highest concentration of H+ ions: baking soda, ammonia, or bleach?

✔ baking soda

Explanation:

The strongest acid based on pH level is gastric acid. Lemon juice has 10 more times H⁺ ions than tomato juice.

The highest concentration of H⁺ ions is in baking soda.

pH value can be explained as the negative logarithm of hydrogen ion (H⁺) ions concentration in the solution. The pH is mathematically inversely proportional to the number of H⁺ ions.

pH = - log ([H⁺])

In chemistry, the acidity or basicity of an aqueous solution can be determined from the pH value. Acidic solutions generally have lower pH values while basic or alkaline solutions have high pH values.

The pH scale ranges from pH values 0 to 14 while a pH equal to 7.0 is neutral. A low pH value of about 1 or 2 is acidic and a high pH (of 12 or 14) is basic.

Baking soda has a low pH value among baking soda, ammonia, or bleach so it will have the highest concentration of H⁺ ions.

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In the J = 0 state, the BrF molecule does not undergo any revolutions per second. In the J = 1 state, it undergoes approximately 0.498 revolutions per second, and in the J = 10 state, it undergoes approximately 15.71 revolutions per second.

To calculate the rotational constant B, we can use the formula:

B = 1 / (2 * π * Δν)

Where:

B = rotational constant

Δν = spacing between consecutive lines in the rotational spectrum

Given that the spacing between consecutive lines is 0.71433 cm^(-1), we can substitute this value into the formula:

B = 1 / (2 * π * 0.71433 cm^(-1))

B ≈ 0.079 cm^(-1)

The moment of inertia (I) of the molecule can be calculated using the formula:

I = h / (8 * π^2 * B)

Where:

h = Planck's constant

Given that the value of Planck's constant (h) is approximately 6.626 x 10^(-34) J·s, we can substitute the values into the formula:

I = (6.626 x 10^(-34) J·s) / (8 * π^2 * 0.079 cm^(-1))

I ≈ 2.11 x 10^(-46) kg·m^2

The bond length (r) of the molecule can be determined using the formula:

r = sqrt((h / (4 * π^2 * μ * B)) - r_e^2)

Where:

μ = reduced mass of the molecule

r_e = equilibrium bond length

To calculate the wavenumber (ν) of the J = 9+ to J = 10 transition, we can use the formula:

ν = 2 * B * (J + 1)

Substituting J = 9 into the formula, we get:

ν = 2 * 0.079 cm^(-1) * (9 + 1)

ν ≈ 1.58 cm^(-1)

To determine the most intense spectral line at room temperature (300 K), we can use the Boltzmann distribution law. The intensity (I) of a spectral line is proportional to the population of the corresponding rotational level:

I ∝ exp(-E / (k * T))

Where:

E = energy difference between the levels

k = Boltzmann constant

T = temperature in Kelvin

At room temperature (300 K), the population distribution decreases rapidly with increasing energy difference. Therefore, the transition with the lowest energy difference will have the most intense spectral line. In this case, the transition from J = 0 to J = 1 will have the most intense spectral line.

To calculate the number of revolutions per second, we can use the formula:

ω = 2 * π * B * J

Where:

ω = angular frequency (in radians per second)

J = rotational quantum number

For J = 0:

ω = 2 * π * 0.079 cm^(-1) * 0 = 0 rad/s

For J = 1:

ω = 2 * π * 0.079 cm^(-1) * 1 ≈ 0.498 rad/s

For J = 10:

ω = 2 * π * 0.079 cm^(-1) * 10 ≈ 15.71 rad/s

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Answer:

a. 1.12 L

Explanation:

Step 1: Write the balanced equation for the photosynthesis

6 CO₂(g) + 6 H₂O(l) ⇒ C₆H₁₂O₆(s) + 6 O₂(g)

Step 2: Calculate the moles corresponding to 2.20 g of CO₂

The molar mass of CO₂ is 44.01 g/mol.

2.20 g × 1 mol/44.01 g = 0.0500 mol

Step 3: Calculate the moles of O₂ produced

The molar ratio of CO₂ to O₂ is 6:6. The moles of O₂ produced are 6/6 × 0.0500 mol = 0.0500 mol

Step 4: Calculate the volume occupied by 0.0500 moles of O₂ at STP

At STP, 1 mole of O₂ occupies 22.4 L.

0.0500 mol × 22.4 L/1 mol = 1.12 L

Answer:

We can use the principle of conservation of energy to solve this problem. The heat lost by the metal is equal to the heat gained by the water:

Q metal = -Q water

where Q metal is the heat lost by the metal, and Q water is the heat gained by the water.

The heat lost by the metal can be calculated using the formula:

Q metal = m metal * c metal * ΔT metal

where m metal is the mass of the metal, c metal is its specific heat, and ΔT metal is the change in temperature of the metal.

The heat gained by the water can be calculated using the formula:

Q water = m water * c water * ΔT water

where m water is the mass of the water, c water is its specific heat, and ΔT water is the change in temperature of the water.

We know the values of all the variables except c metal, so we can solve for it. We can start by calculating the values of Q metal and Q water:

Q metal = -Q water

m metal * c metal * ΔT metal = -m water * c water * ΔT water

Substituting the given values, we get:

5.4 g * c metal * (100.0 °C - T) = -142 g * 4.18 J/(g*°C) * (T - 24.2 °C)

Simplifying and solving for c metal, we get:

c metal = [142 g * 4.18 J/(g*°C) * (T - 24.2 °C)] / [5.4 g * (100.0 °C - T)]

Multiplying out, we get:

c metal = [593.56 J/(°C) * (T - 24.2 °C)] / [5.4 g * (100.0 °C - T)]

To solve for c metal, we need to find the value of T that satisfies the equation. We can do this by substituting the given value of ΔT water = 0.9 °C into the equation and solving for T:

c metal = [593.56 J/(°C) * (T - 24.2 °C)] / [5.4 g * (100.0 °C - T)]

c metal = [593.56 J/(°C) * (T - 24.2 °C)] / [540 g - 5.4 g * T]

0.9 g * [593.56 J/(°C) * (T - 24.2 °C)] = [540 g - 5.4 g * T] * c metal

535.2044 J/(°C) * (T - 24.2 °C) = 540 g * c metal - 5.4 g * T * c metal

535.2044 J/(°C) * T - 12931.7808 J = 540 g * c metal - 5.4 g * c metal * T

5.4 g * c metal * T + 535.2044 J/(°C) * T = 540 g * c metal + 12931.7808 J

T * (5.4 g * c metal + 535.2044 J/(°C)) = 540 g * c metal + 12931.7808 J

T = [540 g * c metal + 12931.7808 J] / [5.4 g * c metal + 535.2044 J/(°C)]

Substituting the given values, we get:

T = [540 g * c metal + 12931.7808 J] / [5.4 g * c metal + 535.2044 J/(°C)]

T = [540 g * c metal + 12931.7808 J] / [5.4 g * c metal + 535.2044 J/(°C)]

T ≈ 23.3 °C

Therefore, the specific heat of the metal is:

c metal = [142 g * 4.18 J/(g°C) * (T - 24.2 °C)] / [5.4 g * (100.0 °C - T)]

c metal ≈ 0.39 J/(g°C)

So the specific heat of the metal is approximately 0.39 J/(g*°C).

A 5.4 g sample of the metal is heated to the 100.0 °C and is placed in the beaker containing 142 g of the water at 24.2 °C. The specific heat of the metal is 1.322 J/ g °C.

The mass of the metal = 5.4 g

The final temperature = 25.1 °C

The initial temperature = 100 °C

The specific heat capacity of metal = x

The mass of the water = 142 g

The final temperature = 25.1 °C

The initial temperature = 24.2 °C

The specific heat capacity of water = 4.184 J/ g °C

Loss of Heat of Metal = Gain of Heat by Water

-q metal = + q metal

- 5.4 × x × ( 25.1 - 100 ) = 142 × 4.184 ( 25.1 - 24.2 )

404.46 x = 534.71

x = 1.322 J/ g °C

The specific heat capacity of metal is  1.322 J/ g °C.

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The seedlings exerted an upward pushing force on the soil explains why the

seeds emerged from the soil.

Bob watered the soil in which the seed absorbs the water through the coat ,

the seed coat and embryo begins to enlarge and emerge from the soil.

The hydrated enzymes become active thereby increasing metabolic

activities and energy production which is needed for the growth of the plant.

The energy helps the seed exert an upward force on the soil.

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The four amino acids that are ranked in terms of their solubility in the solvent used, according to the Rf values, are Leucine, Arginine, Alanine, and Glycine.

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Answer: D.

Explanation:

In an exothermic reaction, the reactants have higher potential energy than the products, and energy is released. In an endothermic reaction, the reactants have lower potential energy than the products, and energy is absorbed. In this case, the statement that best describes the total energy change of the system is D. The reactants have higher potential energy, and energy is absorbed.

I hope this helps. Let me know if you have any other questions!

The average corrected freezing point is 1.5 °C and uncorrected freezing point is 2.5 °C.

Freezing point is defined as the temperature at which a liquid changes to solid when cooled.

Trial                              freezing point (°C)

Run 1                                     0.5

Run 2                                     4.0

Run 3                                     3.0

The average uncorrected freezing point is = ( 0.5 + 4.0 + 3.0 ) / 3

                                                                       = 7.5 / 3

                                                                       =  2.5 °C

corrected freezing points (°C)

                3.5

                0.0

                 1.0

The average corrected freezing point is = (3.5 + 0 + 1 ) / 3

                                                                  =  4.5 / 3

                                                                  =  1.5 °C

Thus, The average corrected freezing point is 1.5 °C and uncorrected freezing point is 2.5 °C.

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