Copper is a metal that is used for many purposes. It is mined from the earth using various methods. Though the amount of copper in the Earth's crust is very large, if the mining of copper continues, it will eventually run out.

Jim thinks that conserving copper is important, and says that the best way to do this would be to stop all copper mining at once. Is there a problem with this solution?

A. no, it is a good solution as any.
B. yes, there is no need to conserve copper.
C. no, we must conserve copper no matter what.
D. yes, the need to conserve copper must be balanced with use

There're three termination codons

IN RNA IN DNA NAME

UAG TAG "amber"

UAA TAA "ochre"

UGA TGA "opal"

Answer:

There are three termination code words.

Explanation:

From the question stated, we have three termination code words as shown below.

IN RNA              IN DNA               NAME        

UAG                    TAG                  "amber"

 UAA                     TAA                  "ochre"

UGA                    TGA                    "opal"

Answer:

Carbon is the basis of all living things

Nitrogen is found in certain foods

Oxygen and hydrogen combine with each other to form water

Carbon, oxygen, hydrogen, nitrogen, phosphorus and sulfur are found in organic compounds

Explanation:

We are all made up of mainly three elements, Carbon, Hydrogen, and Oxygen. These three elements are found in every living organism on our planet, and along with a few trace elements, they make up all the nutrients we take in and use to build our bodies and survive.

Nitrogen is primarily found in meats, and this is because nitrogen is a key element in amino acids (which are used to build proteins), however we cannot directly assimilate nitrogen from the air, so we have to assimilate it through amino acids already synthesized in plants, or in proteins found in meat.

The chemical formula for water is H₂O. Seeing the chemical formula, it is obvious that hydrogen and oxygen are the only elements in the water molecule.

In our bodies, we use phosphorus to form our skeleton and help maintain it, sulfur and nitrogen can be found in some amino acids, and carbon, hydrogen and oxygen can be found in carbohydrates, lipids and proteins.

Answer:

Carbon is the basis of all living things

Nitrogen is found in certain foods

Oxygen and hydrogen combine with each other to form water

Carbon, oxygen, hydrogen, nitrogen, phosphorus and sulfur are found in organic compounds

Explanation:

LOL FREE POINTS

Hello!

In this chemical equation, there are two main elements. Those elements are magnesium (Mg) and oxygen (O).

Molecules are a group of atoms bonded together, and in this case, the oxygen molecules is O2, but not 2MgO because there are two different molecules in this compound.

Coefficients are a number that multiply an entire molecule, and are also placed in front of it. In this case, O2 has no coefficient, but a subscript of 2. But, every molecule in this equation must have a coefficient and if add a coefficient of 1 to the oxygen molecule, it does nothing to the overall balancing of equations.

Therefore, the coefficient to the oxygen molecule is choice C, 1.

We have that It is seen from the equation that the Number or variable that Precedes the Oxygen atom is 1

Option C

From the question we are told

in this equation 2mg+o2=2mgo what is the coefficient to the oxygen molecule  

A,2  

B,4  

C,1  

D,0

Generally

Coefficient of a molecule is the digit, Number or variable that precedes the Molecule

Therefore

It is seen from the equation that the Number or variable that Precedes the Oxygen atom is 1

Option C

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Yes, this is a balanced chemical equation, and it obeys the Law of Conservation of Mass.

A balanced chemical equation obeys the Law of Conservation of Mass if there are the same numbers of each type of atom on each side of the reaction arrow.

N₂ + 3H₂ ⟶ 2NH₃

Let’s check the numbers.

Atom  On the left  On the right

   N            2                 2

   H            6                 6

We have the same numbers of H and O on each side of the reaction arrow.

The equation is balanced and it obeys the Law of Conservation

of Mass.

Carbon:

Protons: 6

Neutrons: 7

Electrons: 6 (in a neutral atom)

Hope that helps:)

Rutherford's gold-foil experiment showed that D. the atom is mostly empty space.

When he shot α particles at a thin gold foil, most of them went straight through the foil without being deflected.

However, a few of the α particles were deflected by rather large angles. He concluded that the atom is mostly empty space with almost all its mass concentrated in a small central nucleus.

What are the options? An increase in density does not occur in an increase of volume or a decrease of mass.

With $14.12, and a price of $3 per pound, you can buy 4 pounds of pecans, which equates to 508 pecans, since each pound has 127 pecans.

To determine how many pecans can be bought for $14.12, we need to calculate the number of pounds that can be purchased and then multiply by the number of pecans per pound. The given price is $3 per pound, and there are 127 pecans per pound.

First, divide the total amount of money by the price per pound:

$14.12 ÷ $3.00 = 4.7067 pounds

Since you cannot purchase a fraction of a pecan, we need to find the maximum whole number of pounds that can be bought with $14.12, which is 4 pounds. Multiplying this number by the number of pecans per pound gives the total number of pecans that can be bought:

4 pounds × 127 pecans/pound = 508 pecans

Therefore, you can buy 508 pecans for $14.12.

The region of the atom where protons and neutrons are located (B) is called the nucleus.

The region of the atom where electrons are located (A) is called orbits.

An atom is made up of electrons in orbits and protons and neutrons in the nucleus.

In the atom, there is an innermost part where we find the subatomic particles called neutrons and protons. This region of the atom is called the nucleus. Most of the mass of the atom is concentrated here.

The electrons are found to move round this nucleus in circular paths called orbits.

In the figure, label A refers to orbits while label B refers to the nucleus.

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Answer:

1st is Nucleus and 2nd is Orbitals

Explanation:

Answer : Equation A represents a synthesis reaction, and equation B represents a combustion reaction.

Explanation :

A : [tex]H_2+Cl_2\rightarrow 2HCl[/tex]

Equation A is a synthesis reaction in which the two reactants combine to form a single product.

B : [tex]CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]

Equation B is a combustion reaction in which the a hydrocarbon react with an oxygen to give carbon dioxide and water a s a product.

Hence, the equation A represents a synthesis reaction, and equation B represents a combustion reaction.

From the illustration, the type of reaction represented by equation A would be a synthesis reaction while that of B would be a combustion reaction.

In synthesis reactions, two or more atoms of different elements or molecules come together to form a product. In equation A, H2 and Cl2 come together to form HCl. Thus, A is a synthesis reaction.

In combustion reactions, substances react in oxygen to generate new products, usually accompanied by light and the generation of heat. In equation B, CH4 reacts with O2 to produce CO2 and H2O with the production of heat. Thus, B is a combustion reaction.

More on different types of reactions can be found here: https://brainly.com/question/20479735

Hey there!

Moles of stock solution:

47.0 mL in liters : 47.0 / 1000 => 0.047 L

n = M * V

n = 0.400 * 0.047

n = 0.0188 moles

Volume final :

M = n / V

0.100 = 0.0188 / V

V = 0.0188 / 0.100

V = 0.188 L =>  188 mL

Therefore Watter added :

volume final - volume initial

188 mL - 47.0 mL =>  141 mL

Hope That helps!

A. The amount of sugar

Answer: A) The amount of sugar

Explanation:

The independent variable is the one which can be changed, altered or even manipulated manually so as to bring changes and alteration over the dependent variable. The dependent variable is the variable in which changes occur due to independent variable. It is the outcome of the experiment.

The amount of sugar is the correct option. This is because of the fact that amount of sugar can bring a change over the chemical reaction and mass of chemicals being produced.    

Hey There!

Expand soluble ions to get complete ionic equation:

Sn²⁺(aq) + 2 NO³⁻(aq) +  2 K⁺(aq) + S²⁻(aq) :

SnS(s) + 2 K⁺(aq)  + 2 NO³⁻(aq)

Cancel common ions to get net ionic equation:

Sn²⁺(aq) + S²⁻(aq) => SnS(s)

Hope that  helps!

To obtain the whole ionic equation, expand the soluble ions:

Water molecules surround and solvate the ions, weakening the strong electrostatic interactions between them, which causes the ions to separate and spread equally throughout the solution when ionic compounds dissolve in it.

Equations become :

Sn²⁺(aq) + 2 NO³⁻(aq) +  2 K⁺(aq) + S²⁻(aq) :

SnS(s) + 2 K⁺(aq)  + 2 NO³⁻(aq)

To obtain the net ionic equation, eliminate common ions:

Sn²⁺(aq) + S²⁻(aq) => SnS(s)

To learn more about Soluble ions, refer to the below link:

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Final answer:

The statement that all moving objects have momentum is true because momentum is a product of an object's mass and velocity, both of which are non-zero for moving objects.

Explanation:

The statement that all moving objects have momentum is true. Momentum is the product of an object's mass and velocity and is given by the equation p = mv, where p is momentum, m is mass, and v is velocity. Since any object that is moving has a velocity greater than zero and a non-zero mass, it will indeed have momentum. Additionally, momentum is a vector quantity, which means it has both magnitude and direction, and it is measured in kilograms meters per second (kg·m/s).

To further elucidate, let's consider the Law of Conservation of Momentum, which states that in a closed system, the total momentum remains constant unless acted upon by an external force. Therefore, if two objects collide and come to rest, as mentioned in the problem, the momentum is not lost but transferred, ensuring the total momentum before and after the collision is the same.

You need to change them to mole

mole = mass / Molar mass

mole of Ca = 0.910 g / 40.08 g/mol = 0.0227 mol

mole of N = 0.636 g  / 14.01 g/mol = 0.04539 mol

mole of O = 1.453 g / 16.00 g/mol = 0.0908 mol

Then, take the smallest number and divide for all number (in mol that I just found)

Ca = 0.0227 / 0.0227 = 1

N = 0.04539 / 0.0227 = 1.9999 (round it 2)

O = 0.0908 / 0.0227 = 4

So the empirical formula will be Ca1N2O4 ( CaN2O4 )

Answer:- [tex]1.76*10^-^2[/tex] g of carbon dioxide.

Solution:- The balanced equation for the combustion of methane is:

[tex]CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]

There is 1:1 mol ratio between methane and carbon dioxide.  Grams of methane are converted to moles and then using mol ratio we get the moles of carbon dioxide that could further be converted to grams. The calculations are shown as:

[tex]6.40*10^-^3gCH_4(\frac{1molCH_4}{16gCH_4})(\frac{1molCO_2}{1molCH_4})(\frac{44gCO_2}{1molCO_2})[/tex]

= [tex]1.76*10^-^2gCO_2[/tex]

So, complete combustion of given amount of methane gives [tex]1.76*10^-^2gCO_2[/tex] .

Initial pressure of the gas = 65.3 kPa  

Initial volume of the gas = 654 cm³

Initial temperature of the gas = 6⁰C = 273 + 6 = 279 K

Final pressure of the gas = 108.7 kPa

Final temperature of the gas = 4⁰C = 273 + 4 = 277 K

Using the combined gas law for ideal gases:

P₁V₁/T₁ = P₂V₂/T₂  

where P₁, V₁ and T₁ are the pressure, volume and temperature for the initial state and P₂, V₂ and T₂ are the pressure, volume and temperature for the final state.

Plugging the given data into the combined gas law we have,

(65.3 kPa x 654 cm³) / (279 K) = (108.7 kPa x V₂)/(277 K)

V₂ = (65.3 kPa x 654 cm³ x 277 K) / (279 K x 108.7 kPa)

V₂ = 390.1 cm³

It would roughly be 16,404 feet. Or if you wanted to be more specific 16,404.2. I hope this helps.

Easiest way is dimensional analysis.

[tex]5km * \frac{3280.84ft}{1km} = 16404.2[/tex]

Answer:

lepords

Explanation:

The correct answer is: An example of an organism that is not an example of symbiosis would be a predator-prey relationship where the interaction is not obligatory for either species' survival.

Symbiosis is a close and long-term interaction between two different biological organisms. There are three main types of symbiosis: mutualism, commensalism, and parasitism. In mutualism, both species benefit from the interaction. In commensalism, one species benefits while the other is neither harmed nor benefited. In parasitism, one species, the parasite, benefits at the expense of the other, the host.

A predator-prey relationship, such as a lion hunting a zebra, is typically not considered symbiosis because it is usually a short-term interaction and not obligatory for the survival of either species. While both species are involved in an ecological interaction, the relationship is not symbiotic in the sense that it does not meet the criteria of being a close, long-term interaction that is essential to the survival of either species. Each species can potentially find other sources of food, and the interaction does not necessarily occur over a significant portion of the organisms' life spans.

 In contrast, examples of symbiosis include:

- The relationship between clownfish and sea anemones, which is a case of mutualism where the clownfish gains protection from predators among the anemone's tentacles, and the anemone benefits from the clownfish's waste as nutrients and the clownfish's defense against anemone predators.

- The relationship between barnacles attached to whales, which is commensalism, as the barnacles get transportation and access to food without significantly harming or benefiting the whale.

- The relationship between tapeworms and their hosts, which is parasitism, as the tapeworm lives in the host's intestine and absorbs nutrients from the host's diet, causing harm to the host.

 Therefore, a predator-prey relationship like that of a lion and a zebra is not an example of symbiosis because it lacks the necessary characteristics of a close, long-term, and obligatory interaction for the survival of the involved species."

Hey there!:

[ H⁺ ] = [tex]10^{-pH}[/tex]

[H⁺ ] = [tex]10^{-1.9}[/tex]

[ H⁺ ] = [tex]1.26*10^{-2} M[/tex]

Hope that helps!

The concentration of hydroxide ion of unknown acid is [tex]\boxed{7.9344 \times {{10}^{ - 13}}\;{\text{M}}}[/tex]

Further Explanation:

An acid is a substance that has the ability to donate [tex]{{\text{H}}^ + }[/tex] ions or can accept electrons from the electron-rich species. The general dissociation reaction of acid is as follows:

[tex]\text{HA}}\to{{\text{H}}^+}+{{\text{A}}^-}[/tex]

Here, HA is an acid.

The acidic strength of an acid can be determined by pH value. The negative logarithm of hydronium ion concentration is defined as pH of the solution. Lower the pH value of an acid, the stronger will be the acid. At [tex]25\;^\circ {\text{C}}[/tex], pH value of an acid is less than 7.

The formula to calculate pH of acid is as follows:

[tex]{\text{pH}} = -\log\left[ {{{\text{H}}_{\text{3}}}{{\text{O}}^+}}\right][/tex]                                              

Here,

[tex]\left[ {{{\text{H}}_3}{{\text{O}}^ + }} \right][/tex] is the concentration of hydronium ion.

The relation between the concentration of hydronium ion and hydroxide ion is as follows:

[tex]\left[ {{{\text{H}}_{\text{3}}}{{\text{O}}^+}}\right]\left[{{\text{O}}{{\text{H}}^ - }}\right] = {10^{ - 14}}[/tex]                                              

Here,

[tex]\left[ {{{\text{H}}_3}{{\text{O}}^ + }} \right][/tex] is the concentration of hydronium ion.

[tex]\left[ {{\text{O}}{{\text{H}}^ - }} \right][/tex] is the concentration of hydroxide ion.

Given information:

The pH value of unknown acid is 1.9.

To calculate:  

The hydroxide ion concentration of unknown acid.

Solution:

Step 1: Initially, we have to calculate the concentration of hydronium ion by using equation (1).

The formula to calculate pH of the unknown acid is as follows:[tex]{\text{pH}} =  - \log \left[ {{{\text{H}}_{\text{3}}}{{\text{O}}^ + }} \right][/tex]                

                                                    ...... (1)

Rearrange the equation (1) to calculate the concentration of hydronium ion.

[tex]\left[ {{{\text{H}}_{\text{3}}}{{\text{O}}^ + }} \right] = {10^{ - {\text{pH}}}}[/tex]          

                                           ...... (2)                                                  

Substitute 1.9 for pH in the equation (2).

[tex]\begin{gathered}  \left[ {{{\text{H}}_{\text{3}}}{{\text{O}}^ + }} \right] = {10^{ - 1.9}} \\    = 1.2589 \times {10^{ - 2}}\;{\text{M}} \\ \end{gathered}[/tex]

Step 2: The concentration of hydronium ion calculated in step (1) can be used to calculate the concentration of  [tex]{\text{O}}{{\text{H}}^ - }[/tex] ions by using the relation (3).

The relation between the concentration of hydronium ion and hydroxide ion is as follows:

[tex]\left[ {{{\text{H}}_{\text{3}}}{{\text{O}}^ + }} \right]\left[ {{\text{O}}{{\text{H}}^ - }} \right] = {10^{ - 14}}[/tex]                       ...... (3)

Rearrange the equation (3) to calculate the concentration of hydroxide ion.

[tex]\left[ {{\text{O}}{{\text{H}}^ - }} \right] = \frac{{{{10}^{ - 14}}}}{{\left[ {{{\text{H}}_{\text{3}}}{{\text{O}}^ + }} \right]}}[/tex]                    ...... (4)

Substitute [tex]1.2589 \times {10^{ - 2}}[/tex] for  \left[ {{{\text{H}}_{\text{3}}}{{\text{O}}^ + }} \right] in the equation (4).

[tex]\begin{gathered}  \left[ {{\text{O}}{{\text{H}}^ - }} \right] = \frac{{{{10}^{ - 14}}}}{{1.2589 \times {{10}^{ - 2}}}} \\    = 7.9434 \times {10^{ - 13}}\;{\text{M}} \\ \end{gathered}[/tex]

Learn more:

1. The reason for the acidity of water https://brainly.com/question/1550328

2. Reason for the acidic and basic nature of amino acid. https://brainly.com/question/5050077

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Acids, bases, and salts

Keywords: pH, acid, pOH, base, hydronium ion, hydrogen ion, hydroxide ion, acidic nature, and basic nature.

The new weight of the graduated cylinder after adding 57.0 mL of water is 140.2 g.

To determine the new weight of a graduated cylinder after adding water, we need to consider the mass of the water added. The step by step solution is as follows:

Total Mass = 83.2 g (graduated cylinder) + 57.0 g (water) = 140.2 g

Thus, the graduated cylinder now weighs 140.2 g.

The release or absorption of energy indicates a chemical change. (Option C).

A chemical change, also known as a chemical reaction, is a process in which one or more reactants are transformed into new substances (products) with different chemical properties.

During a chemical change, the arrangement of atoms is altered, resulting in the formation of new chemical bonds and the breaking of existing ones.

This process often involves the release or absorption of energy in the form of heat, light, or other forms of energy.

Thus, the release or absorption of energy indicates a chemical change.

Option C is the correct answer.

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Answer:

The seafloor

Explanation:

the bottom of the ocean, aka the sea floor.

usually made from sand

Answer:

H2O

Explanation:

Kinetic energy has increased.

The Kinetic Molecular Theory of gases states that the average kinetic energy of the molecules of a gas is directly proportional to its Kelvin temperature.

Thus, if the temperature of the air in a room has increased, the average kinetic energy of its molecules has increased.

Rusting ability is a chemical property.

Since the act of rusting creates a new material (an oxide), it is a chemical change.  The other three are physical properties, since they do not involve the formation of a new substance.

Answer: The particles move faster and spread further apart

Explanation:

theyre fossils, when extinct beings such as dinosaurs died their bones would sometimes get stuck in clay or amber (i cant remember if theres any other types of rock) or sediment) and stay there for years and years then scientist called Paleontologists find them and study them. hope this helps:)

Answer:

What is meant by extinct How do scientists obtain information about extinct species?

How do scientists obtain information about extinct species? A species is extinct if no members of that species are still alive. Most of what scientists know about extinct species is based on the fossil record. What are mass extinctions?

Explanation: