Why do you think that we used the metal salts (solutions) instead of the pure metals?

The distance between the earth and star = 8 ✕ (9.46 ✕ 1012) = 7.6 ✕ 1013 km.

What is exoplanet?

Every planet in our solar system orbits the Sun. Planets known as exoplanets orbit other stars. It is quite challenging to directly observe exoplanets with telescopes. They are hidden by the bright light from the stars they orbit.

It is challenging to give distances in kilometers for many celestial objects since they are so far away from the earth, such as galaxies or stars.

How far light may travel in a year is measured in large units called light-years. The vast distances are therefore expressed in terms of light-years.

9.46 x 1012 kilometres make up a light year.

In other words, if a star is eight light-years away, light would travel that distance in eight years. This is how the distance between a star and the earth is calculated.

Therefore, the distance between the earth and the star is 8 (9.46 1012) = 7.6 1013 kilometers.

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Five liters of hydrogen gas are stored at a pressure of 400 torrs. If the temperature does not change, then the volume of the gas would be 8 liters when the pressure is decreased to 250 torrs.

It is an imaginary gas for which the volume occupies by it is negligible, this gas does not exist in a practical situation and the concept of an ideal gas is only the theoretical one,

Using the Boyle's law for the given problem,

P₁V₁=P₂V₂

400 × 5 = 250 × V₂

V₂ = 400 × 5 / 250

    = 8 Litres

Thus, if the temperature does not change the volume of the gas would be  8 Litres.

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A covalent bond bond is appropriately described as occurring when one or even more electrons move of one atom to another.

a bond in which the two bound atoms' electron densities are unequally distributed as a result of either a difference in the electronegativity or the effects of induction.

A covalently bonded bond is represented by the water molecule, written as H2O. The oxygen atom is given more time with the electrons than for hydrogen atoms due to the unequal distribution of the electrons.

The electron is an unit of matter with a negative zero elementary charge electric charge. Due to their lack of known components, electrons, which are part of the first generation of lepton particles family, are typically regarded to be elementary particles or substructure

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According to the research, the correct option is d. Fernando is currently going through Detoxification process in which his body is cleared of drugs.

This is the treatment aimed at restoring the body's physiological homeostasis after it has been disturbed by the consumption of psychotropic substances as drugs.

In this sense, this process is carried out under the supervision of specialists in the treatment of addictive behaviors.

Therefore, we can conclude that Detoxification is a process of eliminating drugs or substances harmful to health to achieve physiological stability in the body.

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Answer:

most things would melt

Explanation:

such as glaciers and ice caps in the arctic and Antarctic, causing many floods etc.

ur welcome

In cellular respiration, carbon dioxide and water are the reactants, and fuel and oxygen are the products, this statement is false.

As in the cellular respiration, the fuel which is glucose and oxygen are the reactants, these react to form ATP, while the carbon dioxide and water are the products formed.

The equation of the reaction of cellular respiration is written as -

C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O + 25 ATP

glucose + water → carbon dioxide + water + ATP

Carbon dioxide and water are considered as byproducts or waste products. Aerobic respiration uses up the glucose and oxygen which releases the energy or results in the ATP formation.

Therefore, the statement given is false.

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A synthesis reaction is a reaction in which two compounds come together to form one. In this case, if the product is lithium sulfide, the reactants will be lithium and sulfur. Lithium in its natural form is solid, and sulfur also has a solid-state. Lithium sulfide is also a solid compound. The synthesis reaction will be:

Now, we have to balance the equation. We have two atoms of Li on the products side and 1 atom of Li on the reactants side. So, we put the coefficient 2 in Li molecules.

Now, we have the balanced equation of the synthesis reaction of Lithium Sulfide

A coyote is a species considered as a consumer in the food chain because they need to eat other live organisms to survive (Option 2).

The role of consumers in the food chain is to eat other organisms such as plants (in the case of herbivore consumers) or meat (in the case of carnivore consumers). Coyote is a carnivore consumer.

Therefore, with this data, we can see that the role of a consumer in the food chain is to consume (eat) other organisms.

Complete question:

Choose the correct option. A coyote is a ____ producer, consumer, decomposer.

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Considering the definition of calorimetry, if 200.0 g of ice absorb 1255.0 J of heat, the temperature change is 2.988°C.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change). So, the amount of heat that a body receives or transmits is determined by the following expression:

Q = c×m×ΔT

Where:

In this case:

Replacing in the definition of calorimetry:

1255 J = 2.1 J/gC× 200 g× ΔT

Solving:

1255 J ÷(2.1 J/gC× 200 g)= ΔT

2.988 °C= ΔT

Finally, the temperature change is 2.988°C.

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The mass of the 13 cm³ of copper, given that 100 cm³ of it has a mass of 890 g is 115.7 g

We'll begin by obtainig the density of the copper. This can be obtained as illustrated below:

Density = mass / volume

Density of copper = 890 / 100

Density of copper = 8.9 g/cm³

Finally, we shall determine the mass of the 13 cm³ of copper. This is obatined as follow:

Density = mass / volume

Cross multiply

Mass = Density × volume

Mass of copper = 8.9 × 13

Mass of copper = 115.7 g

Thus, the mass of the copper is 115.7 g

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The mass of 13 cm³ of copper with a volume of 100 cm³ has a mass of 890 g is 115.7 grams.

Mass is defined as a dimensionless number used to describe the mass of a particle or item.

We'll start by finding out how dense copper is.

Given, Volume = 100 cm³

           Mass = 890 g

Density = Mass / Volume

             = 890 g / 100 cm³

             = 8.9 g/cm³

Now to determine mass is 13 cm³ of copper is

Density = Mass / Volume

So, Mass = Density x Volume

               = 8.9 g/cm³ x 13 cm³

               = 115.7 grams

Thus, the mass of 13 cm³ of copper with a volume of 100 cm³ has a mass of 890 g is 115.7 grams.

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Answer:

Explanation:

The mass of the bone sample can be found by using the formula

mass = density × volume

From the question

density = 1200mg/cm^3

volume = 39.5cm^3

We have....

mass = 1200 × 39.5 = 47400

We have the final answer as

Hope this helps you

A calibration curve is used to calculate the limit of detection and the limit of quantitation, as well as the concentration of an unknown material.

The concentration of an unidentified drug can be determined using a calibration curve. Researchers and developers can use these curves to determine where an unidentified substance plots by comparing them to data points of known drugs at various doses.

A calibration curve is used to calculate the limit of detection and the limit of quantitation, as well as the concentration of an unknown material. The instrument response to a series of standard samples at various concentrations is used to produce the curve.

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What occurs when copper sulfate solution is combined with a piece of silver metal?

If the reaction happens, you should also write the chemical equation in balance.

Reactions to displacement as a first option

A more reactive metal can displace a less reactive metal from a solution in a displacement reaction. The reactivity series of metals can be used to forecast the end products of a displacement process. The metals are arranged according to their reactivity with diluted acids in the reactivity series. A specific metal in the reactivity series may be displaced by metals positioned above it.

In the reactivity series, some of the elements above hydrogen (H) are potassium (K), sodium (Na), magnesium (Mg), zinc (Zn), and others. Several of the metals in the reactivity sequence below hydrogen

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Answer:

The Atomic Number

Explanation:

The atomic number is the number of protons of an atom in its nucleus.

Each element has a unique atomic number.

(view screenshot too, to find where it is in element table)

The presence of partial charges in a liquid enables the liquid to split the bonds of the salt when dissolved in it. On the other hand, in the absence of partial charges, the liquid won't be able to break bonds apart and dissolve salts in it.

How a liquid dissolves things?

In a liquid such as water the charges are arranged in a such a way that generates partial positive and negative sides on hydrogen and oxygen atoms giving rise to polarity.

So when a substance such as salt is dissolved in water, the partial positive charge attracts the negative side of the salt with a definite force while partial negative charge of liquid pulls the positive charges apart.

In general, the partial charges of the liquid pull apart the charges of the added substance which results in breaking their chemical bonds and dissolving them.

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The percent composition are the percent in mass of each atom in the molecule.

Since we know that the molar mass of the substance is 334.0 g/mol, we can use it to figure out how much of each atom we have per molecule.

Starting from carbon, we know it is 75.42% of the mass.

In 1 mol of the substance, there are 334.0 g, 75.42% of which is from carbon atoms.

So, in 1 mol of the substance, there are the following mass of carbon:

The aromic mass of the carbon atom is 12.0107 g/mol.

That is, in 1 mol of the substance -> 251.9028 g of C.

That mass of carbon is equivalent to:

So, in 1 mol of the substance -> 251.9028 g of C -> 21 mol of C. This means that for each molecule of the substance we have 21 atoms of carbon.

Now, we can just repeat the process for Hydrogen, Nitrogen and Oxygen.

Hydrogen has an atomic mass of 1.00794 g/mol, and the percent composition of it is 6.63%, so:

So, for each molecule of the substance there are 22 atoms of hydrogen.

Nitrogen has an atomic mass of 14.0067 g/mol, and the percent composition of it is 8.38%, so:

So, for each molecule of the substance there are 2 atoms of nitrogen.

Oxygen has an atomic mass of 15.9994 g/mol, and the percent composition of it is 9.57%, so:

So, for each molecule of the substance there are 2 atoms of oxygen.

To summarize, we have, for each molecule of the substance:

- 21 carbon

- 22 hydrogen

- 2 nitrogen

- 2 oxygen

So, the molecular form of the substance is C₂₁H₂₂N₂O₂.

Answer:

This is NOT a CUBE..

now Considering that one side of one small block is equal to 1 unit.

Then

Length = 3 units

Width = 3 units

Height = 4 units

Please tell me if this is correct

Length would be 3 units, Height is 4 units, and Width is I want to say 5 or 6 not truly sure

The percent yield is 83.29%.

The real yield is calculated as the theoretical yield divided by the theoretical yield multiplied by 100. % Yield = (Actual Yield % Theoretical Yield × 100%) Many factors can cause a chemical reaction's actual yield to be lower than its theoretical yield.

Numbers of moles copper = 0.0970 moles

Mass of copper(I) sulfide = 6.43 grams.

Balanced equation

2Cu + S ⇒ Cu₂S

Calculate moles of Cu₂S

To create 1 mol of Cu2S from 2 moles of Cu, we require 1 mole of S.

For 0.0970 moles Cu we'll have 0.0970 / 2 = 0.0485 moles

Calculate mass of Cu₂S

Mass Cu₂S = moles Cu₂S × molar mass Cu₂S

Mass Cu₂S = 0.0485 moles × 159.16 g/mol

Mass Cu₂S = 7.72 grams

Calculate percent yield

Percent yield = (actual yield/ theoretical mass) × 100%

Percent yield = (6.43grams / 7.72 grams) × 100%

Percent yield = 83.29 %

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Answer:

Explanation:

About 1.3 seconds

It takes light about 1.3 seconds to travel from the moon to the Earth at a distance of 384000 km. This is because the speed of light is about 300000 km/s. So, it takes light about 1.3 seconds to travel from the moon to the Earth.

The following chlorides are ionic or covalent:

SiCl₄ = covalent

PCl₃ = covalent

CaCl₂ = ionic

CsCl = ionic

CuCl₂ = ionic

CrCl₃ = ionic

SiCl₄ is silicon tetrachloride. SiCl₄ is a covalent. The bond between silicon and chlorine is formed by the sharing of electrons.

PCl₃ is Phosphorous trichloride . PCl₃ is covalent. Phosphorus contain 5 electrons in valence shell and requires 3 more to complete octet and chlorine require one electron to complete octet so, the bond formed is by sharing of electron.

CaCl₂ is calcium chloride. CaCl₂  is an ionic. calcium is metal and  metal donates electron  to  chlorine is non metal and non metal accept electrons  and become Ca²⁺  and Cl⁻. The bond formed by the transfer of electrons.

CsCl is cesium chloride. CsCl is an ionic. symbol of ions : Cs⁺ and Cl⁻

CuCl₂ is copper(II) chloride. CuCl₂ is ionic formed by the transfer of electrons. symbol of ions : Cu²⁺ and Cl⁻

CrCl₃  is chromium(III) chloride. CrCl₃  is an ionic. symbol of ions : Cr³⁺ and Cl⁻.

Thus, The following chlorides are ionic or covalent:

SiCl₄ = covalent

PCl₃ = covalent

CaCl₂ = ionic

CsCl = ionic

CuCl₂ = ionic

CrCl₃ = ionic

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Adding buffering compounds to neutralize acids is used to address acid mine drainage.

Therefore, the correct option is C.

Adding lime or other alkaline materials to neutralize the acidity of the soil, as well as adding uncontaminated topsoil, planting vegetation, and modifying slopes to stabilize the soil and reduce surface water infiltration into the underlying contaminated material, are some of the common methods for cleaning up contaminated land. The most commonly used technique for treating AMD contamination is the use of alkaline reagents like lime, limestone, sodium carbonate, or sodium hydroxide. The purpose of this process is to neutralize acidic water and prevent the precipitation of heavy metals.

Acid mine drainage (AMD) is a global problem that has negative effects on the ecosystem. Because of its high acidity and high concentration of heavy metals and metalloids, AMD is harmful to both plants and animals as well as to people. Traditional AMD therapies have been in use for a very long time.

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Answer:

Electrical energy is caused by moving

electric ions.

Explanation:

The faster the charges move, the more electrical energy they carry. As the charges that cause the energy are moving, electrical energy is a form of kinetic energy.

The minimum mass of octane that could be left over is 0.468 grams.

Step 1: Data given

Mass of octane = 3.4 grams

Mass of oxygen = 20.5 grams

Molar mass octane = 114.23 g/mol

Molar mass oxygen = 32.0 g/mol

Step 2: The balanced equation

2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O

Step 3: Calculate the number of moles

Moles = mass / molar mass

Moles octane = 3.4 grams / 114.23 g/mol

Moles octane = 0.0297 moles

Moles O₂ = 20.5 grams / 32.0 g/mol

Moles O₂ = 0.640 moles

Step 4: Calculate the limiting reactant

For 2 moles octane we need 25 moles O₂ to produce 16 moles CO₂ and 18 moles H₂O

O₂ is the limiting reactant. It will completely be consumed (0.640 moles). There will react 0.0320/ 12.5 = 0.0256 moles.

There will remain 0.0297 - 0.0256  = 0.0041 moles octane.

Step 5: Calculate mass octane remaining

Mass octane = moles * molar mass

Mass octane = 0.0041 moles * 114.23 g/mol

Mass octane = 0.468 grams

The minimum mass of octane that could be left over is 0.468 grams.

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Answer:

A water turbine is used to convert the energy contained in water, potential energy or kinetic energy, into mechanical or electrical energy. There are two types of water turbines, the reaction water turbine, and the impulse water turbine.

Explanation:

Answer:

Water turbines are used to take energy whether it may be kinetic or potential from the water and convert that energy into mechanical, or electrical energy.

Explanation:

According to the given statement The molarity of the iron(II) solution is 0.648 M.

The amount of the sample in a specific solution volume is defined as its molarity (M). The molarity of a solute per litre of a solution is known as molarity. The molar concentration is yet another name for molarity.

Iron(II) solution volume (V₁) = 25.0 mL/0.025 L

Dichromate solution (V₂) has a volume of 18.0 mL, or 0.018 L.

Dichromate solution molarity (M₂) = 0.150 M

Molarity of dichromate solution is :

M₂ = n₂/V₂

(n₂  = M₂* V₂ = 0.150  * 0.018 = 2.7 * 10⁻³ mol

Complete balanced equation is given below.

[tex]6 \mathrm{Fe}^{2+}(a q)+\mathrm{Cr}_2 \mathrm{O}_7^{2-}(a q)+14 \mathrm{H}^{+}(a q) \rightarrow 6 \mathrm{Fe}^{3+}(a q)+2 \mathrm{Cr}^{3+}(a q)+7 \mathrm{H}_2 \mathrm{O}[/tex]

It is obvious from the equation that 1 mole of dichromate is needed to make 6 moles of iron(II) solution.

Therefore, we calculate the number of moles of iron(II) solution using the unitary technique.

1 mole of dichromate is equal to 6 moles of iron (II)

6n₂ moles of iron are equal to n₂ moles of dichromate (II)

=6 * 2.7 * 10⁻³ = 0.0162 mol Fe²⁺

So, 0.0162 moles of iron(II) is needed. Therefore,

Now, molarity of iron(II) solution is given as: n[tex]_1[/tex] = 0.0162

Molarity = Moles ÷ Volume

M₁ = n[tex]_1[/tex]/V₁

M₁ = 0.0162mol/0.025 L = 0.648 M

The molarity of the iron(II) solution is 0.648 M.

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The complete question is -

The titration of 25.0 mL of an iron(II) solution required 18.0 mL of a 0.150M solution of dichromate to reach the equivalence point. What is the molarity of the iron(II) solution?

Energy was lost by substance A to the environment is the statement which best supports the data in the table and is denoted as option D.

This is referred to as the processes which is characterized by the movement of energy from one system to another an an example is heat energy transfer which have different techniques such as conduction, convection etc.

Temperature on the other hand is the measure of the degree of hotness or coldness of a substance and is influenced by heat energy.

From the graph, we can deduce that substance has a temperature which was decreasing with time while substance B has a temperature which was constant throughout.

This therefore means that Energy was lost by substance A to the environment hence ,the reason why option D was chosen as the correct choice.

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Molality (W) is the ratio of the amount of substance of a solute (in moles – n) to the mass in kilograms of the solvent (m1). It can be calculated by the following formula:

W = n/m1

Step 1 - Let's discover how many moles of sodium fluoride is needed first.

Let's transform 600 g of water to kilograms:

1 g = 0.001 kg

600 g = 0.6 kg

W = 0.600m

m1 = 0.6

0.600 = n/0.6

n = 0.36 moles of sodium floride

Step 2 - Let's transform 0.36 moles of NaF into grams. Let's use the following formula: mass = moles x molar mass

molar mass of NaF = 42 g/mol

mass = 0.36 x 42

mass = 15.12 g

Answer: 15.12 g of NaF

Radium have a lower ionization energy than Barium because electrons are closer to the nucleus

What is ionization energy?

Ionization energy can be simply stated as a measurement of an atom's or ion's inclination to give up an electron or of how challenging it is to remove an electron from them. An electron is often lost when a chemical species is in its ground state.

The atom displays a smaller radius than anticipated and the s electrons are more challenging to expel because these electrons are located nearer the nucleus. The first ionization enthalpy of Radium is higher than that of Barium.

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The volume of water used is 500cm^3.

The volume of water used.

NaOH concentration in mol/dm^3=NaOH concentration in g/dm^3/molar mass of NaOH.

M of NaOH=23+16+1=40

M=40 g/mol

0.2mol= concentration of NaOH in g/dm^3/40g/mol

=0.2mol/dm^3*40g/mol

=8g/dm^3

we know that,

1dm^3=1000cm^3

4.00g of NaOH will be dissolved in 4g*1000cm^3/8g

=500cm^3 of water

So, the volume of water used is 500cm^3.

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Answer:

20cm³

Explanation:

Volume = Molarity*number of moles

number of moles = Mass given/Molar mass

number of moles= 4.00g/40.0g

number of moles= 0.1mols

thus:

Volume= 0.200mol/dm³*0.1mol

Volume= 0.02dm³(20cm³)

Among the given options, the option A which is A person's weight on the moon is the less than on the Earth, due to the force of gravity, is true.

The weight of a person is usually one-sixth less than their Earth's weight. Only the value of weight fluctuates from Earth to the moon, whereas the mass stays the same on both earth and moon.

This happens due to the gravitational force of the moon. Moon is smaller than the Earth, therefore it has low gravitational forces. Moon's gravitational force leads to the difference in the weights on the Earth and the moon.

The moon of Earth has comparitively less amount of mass than Earth. It is not only small in size than but it also is not as dense as earth. It is only 60 % dense which leads to lower gravitational pull, hence leading to difference in the weight.

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