science time!!! please explain your answer also.

The practice that would decrease the impact of extracting minerals for smartphones is the properly disposing of mining waste.

Why does manufacturing smartphones have a negative impact?

Most modern smartphones require use of minerals such as copper, tungsten, and cobalt for manufacturing.

These minerals have to be extracted from soil and this has a huge negative impact on ecosystems.

The consequences can include soil erosion, sinkholes, biodiversity loss, and contamination of surface, ground, and freshwater resources by chemicals released during mining operations. Carbon emissions from these activities also have an impact on the atmosphere, which in turn affects biodiversity and human health.

Therefore, the Option D is correct.

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An ester local anesthetic known as benzocaine is frequently used as a topical pain treatment or as cough drops. It is marketed under the trade names Orajel and others. Many over-the-counter anesthetic ointments, including those for oral ulcers, contain it as the active ingredient.

8.49 g of CO2 and 2.14 g of H2O are produced upon complete burning of a 3.54 g sample of benzocaine with extra oxygen. We discover that a different sample weighing 2.35 g has 0.199 g of Nitrogen in it.

It is discovered that benzocaine has a molar mass of 165 g>mol.

A fuel and an oxidant, typically atmospheric oxygen, engage in a high-temperature exothermic redox chemical reaction known as combustion, or burning, which results in the production of oxidized, frequently gaseous products in a mixture known as smoke.

Benzocaine topical overdoses may result in potentially fatal side effects such irregular heartbeats, convulsions, unconsciousness, delayed breathing, or respiratory failure (breathing stops).

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The final temperature of metal if 14.1327 J of heat  energy is added is 289.57 K which is in relation with   specific heat.

Specific heat is calculated by the formula,

Q=mcΔT

In the given problem, Q=14.1327 J, m=10.2 g ,initial temperature=279.24 K

substituting these values in the given equation,

T₂=395.7979/1.3668= 289.57 K.

Specific heat is defined as the amount of heat required to raise the temperature of one gram of a substance by 1 degree Celsius. From specific heat formula, specific heat of any material its mass and gain and loss in temperature can be obtained.

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In areaction, the number of moles consumed and produced have the same ratio as the coefficients on the balanced equation.

So, to calculate the number of moles of any chemical on the reaction given the number of moles of any other, we can use a rule of three.

We put the compound or atom we want on the first column and the one we have information of on the second, and their coefficients on the second row:

We want Al and we have information about Al₂O₃, and their coefficients on the balanced equation are 4 and 2, so:

Al --- Al₂O₃

4 2

Now, we use thise placements to write the equation:

Where the n stands for the number of moles. Now we solve for Al:

And since we know the number of moles of Al₂O₃, we have:

Where the last step we did an approximateion to get to 3 significant figures.

So, the number of moles of Al consumed is 1.60 mol.

Volume of the helium in weather balloon at 15 °C with initial volume of 10L and temperature of 5 °C is 30 L

Given that, Initial volume (V1) = 10 L

Initial Temperature (T1) = 5 °C

Final Temperature (T2) = 15 °C

By gas law,

V1 / V2 = T1 / T2 (Pressure constant)

10 / V2 = 5 / 15

V2 = (15 / 5) * 10

V2 = 3 * 10

V2 = 30 L

Thus, the volume of helium in the weather balloon at 15 °C is 30 L

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For polar molecules :

a) The polarities of the bonds must not cancel each other out  is True.

b) All of the bonds must be polar is false. if we have one polar bond the molecule is polar.

c) there must be at least one nonbonding pair of electrons is false.

d) the molecule must be symmetrical is False.

e) double or triple bonds do not count is false

f) all of the bonds must be nonpolar is false.

g) all of the terminal atoms around a central atom must have different identities is False.

h) at least one bond must be polar is true.

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Using a stoichiometric calculation, it was determined that 178.43 grams of nitrogen are needed to produce 325 grams of ammonia.

We can use a simple stoichiometric proportion to calculate this. First, we write the reaction:
[tex]N_{2} + 3H_{2}[/tex] → [tex]3 NH_{3}[/tex]

We can see that 1 mole of nitrogen produces 2 moles of ammonia.

Nitrogen's molar mass is 2 * 14 = 28 g/mol.

The molar mass of ammonia is 14 + 3 * 1 = 17 g/mol.

Based on this and the reaction equation, we can say that 28 grams of nitrogen produce 3 mol * 17 g/mol = 51 g of ammonia.

Now, we make a proportion:

28 g of nitrogen : 51 g of ammonia = X : 325 g of ammonia

X = 28 g of nitrogen * 325 g of ammonia / 51 g of ammonia = 178.43 g of nitrogen

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Answer: Pascals (Pa)

Explanation:The SI unit for pressure is pascals (Pa). Other units of pressure include torr, barr, atm, at, ba, psi, and manometric units like mm Hg and fsw. I hope this helped! :) have a good day!

Answer:

Explanation:

Question 1

Put the sentences in order to provide an objective summary of the passage. Not all sentences will be used.

Sentence 1. Laughing reduces stress, improves circulation, and reduces the risk of heart problems.

Sentence 2. Funny books, movies, and friends are an important part of healthy living.

Sentence 3: Laughter therapy provides numerous physical and mental benefits.

Sentence 4: People with heart problems may be less likely to laugh because of those problems.

Sentence 5: Scientific research suggests that laughter has many health benefits.

Sentence 6: Laughter causes the endotheli

The equation for the beta decay of Beryllium-10 is 10^ 4 Be =0^ -1 β + 10^ 5Be.

In the course of a radioactive decay process called beta decay, an atomic nucleus emits a beta ray. During beta decay, the proton in the nucleus transforms from a proton to a neutron, and vice versa. + decay refers to the conversion of a proton into a neutron. Similar to this, the conversion of a neutron into a proton is known as decay.

It is clear that the negative beta decay is exothermic. However, a proton becomes a neutron in positive beta decay. Due to the discrepancies in the rest masses (1.3 MeV; see Table 2.1), this requires energy, which is supplied by the nucleus' mass reduction.

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The root growth is related to gravity as as negative geotropic and positive geotropic with regards to gravity on the roots.

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The control provides a reference value for comparison to samples in which a variable is changed.

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The volume  of each of the following bases will react completely with 23.00 mL of 0.500 M HCl are given below ,

( a ) 28 ml

( b ) 230 ml

( c ) 46 ml

The volume  of each of the following bases will react completely with 23.00 mL of 0.500 M HCl can be calculated as ,

Formula used : [tex]M_{1} V_{1}[/tex] =  [tex]M_{2} V_{2}[/tex]               ( 1 )

( a )

Given

[tex]M_{1}[/tex] = 0.500 M

[tex]M_{2}[/tex] = 0.100 M

[tex]V_{1}[/tex] = 23.00 mL

[tex]V_{2}[/tex] = ?

Now putting the all given data in equation ( 1 ) we get the value of volume

0.500 M × 23.00 mL = 0.100 M ×  [tex]V_{2}[/tex]

[tex]V_{2}[/tex] = 0.500 M × 23.00 mL / 0.100 M = 28 ml

( b )

Given

[tex]M_{1}[/tex] = 0.500 M

[tex]M_{2}[/tex] = 0.0500 M

[tex]V_{1}[/tex] = 23.00 mL

[tex]V_{2}[/tex] = ?

Now putting the all given data in equation ( 1 ) we get the value of volume

0.500 M × 23.00 mL =0.0500 M  ×  [tex]V_{2}[/tex]

[tex]V_{2}[/tex] = 0.500 M × 23.00 mL / 0.0500  M = 230 ml

( b )

Given

[tex]M_{1}[/tex] = 0.500 M

[tex]M_{2}[/tex] = 0.250 M

[tex]V_{1}[/tex] = 23.00 mL

[tex]V_{2}[/tex] = ?

Now putting the all given data in equation ( 1 ) we get the value of volume

0.500 M × 23.00 mL = 0.250 M  ×  [tex]V_{2}[/tex]

[tex]V_{2}[/tex] = 0.500 M × 23.00 mL / 0.250 M = 46 ml

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Answer: Botulinum toxin

Explanation: yes

Answer: Botulinum toxin

Explanation:

are among the worst chemicals ever discovered. Botulinum toxins can cause respiratory and muscle paralysis by blocking nerve functioning. Foodborne botulism, newborn botulism, wound botulism, inhalation botulism, and various forms of intoxication are all examples of human botulism.

a) Rubidium: It is a chemical element with chemical symbol Rb.

    Atomic no.: 37

    Group: group 1 and first Alkali metal in the group to have density higher than water.

Discovery: Robert Bunsen and Gustav Kirchhoff

b) Germanium: It is a chemical element with the chemical symbol Ge.

   Atomic no.: 32

   Group: Group 14 Carbon group, a grayish white metalloid in the carbon     group.

   Discovery: Clemens Winkler

c) Magnesium: It is a chemical element with a chemical symbol of

  Atomic no. : 12

  Group: group 2(llA) of the periodic table and the chemical properties with the other five alkaline earth metals.

 Discovery: Joseph Black

d) Titanium: It is a chemical formula with a chemical symbol of Ti

   Atomic no. : 22

  Group : group 4 (IVb) of the periodic table a silver grey white metallic appearance.

  Discovery : William Gregor

e) Iodine : Iodine is a chemical element with a chemical symbol I.

   Atomic no. : 53

   Group: group 7A of the periodic table, which is a non metallic at a standard conditions.

    Discovery: Bernard Courtois

f) Strontium: It is a chemical element with the symbol Sr.

  Atomic no. : 38

 Group : group 2(alkaline earth metal) which is a soft silver white yellowish metallic element.

 Discovery: William Cruickshank

Refer to the attached Periodic Table and link for further information,

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The chemical formula of the substances that has the same number of carbon atoms are:

A chemical or molecular formula is a notation indicating the number of atoms of each element present in a compound.

A subscript, which is a number written below another letter or number, is used to show the number of atoms of each element in a chemical compound.

According to this question, four chemical formulas were given as follows:

However, only C₂H₆O and CH₃CH₂Br contains an equal number of carbon atoms of 2.

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1.28atm

According to Boyle's law

P1V1 = P2V2

where

P is the pressure

V is the volume

Given the following

P1 = 2atm

V1 = 3.2L

V2 = 5L

Required

Final pressure P2

Substitute

P2 = P1V1/V2

P2 = 2*3.2/5

P2 = 6.4/5

P2 = 1.28atm

Hence the pressure in atm of the expanded gas sample

Answer:

6 Neutrons

Explanation:

The number of Protons/Electrons (Protons and electrons are proportional to each other), added with the number of the neutrons that the atom has always equals the mass of the atom.

This claim can be represented with this formula

Protons/Electrons + Neutrons = Atomic Mass

Electrons = 6
Atomic Mass = 12

6(Electrons) + Neutrons = 12(Atomic Mass)
Neutrons = 12 - 6
Neutrons = 6

Therefore, the amount of Neutrons in a carbon molecule are 6

Answer:

Oxytocin is a peptide of nine amino acids (a nonapeptide). 

Explanation:

Answer:Oxytocin is a peptide of nine amino acids (a nonapeptide). The sequence is cysteine - tyrosine - isoleucine - glutamine - asparagine - cysteine - proline - leucine - glycine (CYIQNCPLG).

Explanation:

By using the expression for the equilibrium constant for the reaction and solving the appropriate quadratic equation, we can calculate that the equilibrium concentration of iodine will be 1.77 M.

The balanced reaction equation for this reaction looks like this:

[tex]2 IBr[/tex] → [tex]I_{2}+Br_{2}[/tex]

The expression for the equilibrium constant will look like this:

[tex]K_{c} =\frac{[I_{2} ][Br_{2} ]}{[IBr]^{2} }[/tex]

Because all the volumes are the same, we can just use the moles of all reaction components instead of concentrations. Now, because there was no iodine or bromine when the reaction began, all iodine and bromine present at equilibrium are formed by IBr decomposition, their concentrations will be the same (X). The concentration of IBr will be reduced by 2X, so we can plug that into the equilibrium constant expression:

[tex]8.5=\frac{X^{2} }{(4.14-2X)^{2} }[/tex]

We transform this expression to get a quadratic equation:

33X² - 140.76X + 145.6866 = 0

When we solve for X, one solution is 2.49 M (which is impossible, because 4.14 moles of IBr can create a maximum of 4.14 mol / 2 = 2.07 mol of iodine), and the other (correct) solution is 1.77 M.

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Answer: The first task is to determine the moles of each gas present. This makes use of the molar masses of each gas. The molar masses are:

Molar Mass Ar = 39.948 grams per mole

Molar Mass Ne = 20.1797 grams per mole

Molar Mass CO2 = 44.01 grams per mole

Calculating for the moles of each gas present, we get.

(In the png attatched.)

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The volume of the substance with mass of 54mg and density of 1.2g/mL will be 0.045 mL.

How much "stuff" is contained in a specific quantity of space is determined by its density. For instance, a block of the harder, lighter element gold (Au) will be denser than a block of the heavier element lead (Pb) (Au). Styrofoam blocks are less dense than bricks.

Mass per unit volume serves as its definition.

We know that, Density = mass of substance / volume of substance

Given,

mass = 54 mg = 0.054 g

Density = 1.2g/mL

D = m/ v

1.2 = 0.054 / v

1.2 × v = 0.054

v = 0.054 / 1.2

v = 0.045 mL

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Answer:

b Atom X = 1; Atom Y = 7

Explanation:

a valence electron is an electron in the outer shell

So X has 1 in outer shell

Y has 7 in outer shell

The annual operation of the refrigerator produces 6835.5 g of sulfuric acid. This calculation is made assuming that the enthalpy of combustion for sulfur is equal to the enthalpy of combustion for carbon.

First, we are going to transform 655 kWh into kilojoules. Because 1 kWh = 3.6e6 J = 3600 kJ, that means that a typical frostless refrigerator uses 655 * 3600 kJ = 2358000 kJ of energy on a yearly basis.

The enthalpy of combustion for carbon (or enthalpy of carbon dioxide formation) is -393 kJ/mol. That means that we can calculate the number of moles of carbon needed to produce 2358000 kJ of energy.

2358000 kJ / 393 kJ/mol = 6000 mol of carbon

Because the molar mass of carbon is 12 g/mol we need

6000 mol * 12 g/mol = 72000 g of carbon

If 3.1% of this carbon is actually sulfur, then we will burn 0.031 * 72000 g = 2232 g of sulfur during one year. The molar mass of sulfur is 32 g/mol, which means we transformed 2232 g / 32 g/mol = 69.75 mol of sulfur into sulfur dioxide and further into sulfuric acid. Because 1 mol of sulfur is needed to produce 1 mol of sulfuric acid, we produced 69.75 moles of sulfuric acid.

The molar mass of sulfuric acid is 98 g/mol, so over the course of one year, we produced 69.75 mol * 98 g/mol = 6835.5 g of sulfuric acid.

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Answer:

Explanation:

1. The characteristics of an acid are that it has a sour taste, reacts with metals, and turns blue litmus paper into red.

2. When you add TOO MUCH solute to a solution, the solution becomes saturated at some point. It will not dissolve anymore and will remain solid instead.

3. A mixture contains an acid and a base.

4. You test a liquid, and its pH is 7. This liquid is Neutral.

5. Lemon juice, apple juice, and Vinegar all have pH measurements below seven (7), making them acidic.

6. Ammonia, blood, and drain cleaner all have pH measurements above seven (7), making them basic.

7. Erosion is another word for eating away at material.

8. Vinegar can be an acid or base because it is a good conductor of electricity.

9. Cation is a positive ion and Anion is a negative ion.

10. Two or more substances mixed but not chemically combines are a Mixture.

B. the specific heat of water

A multicellular organism is an organism that consists of many cells. The term "multi" is technically used to refer to something that is more than one, so "multicellular" means more than one.

Multicellular organisms evolve through cell specialization and division of labour. Cells become efficient at one process and depend on other cells to carry out different processes. All the cells work in coordination to ensure the proper functioning of the body.

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Answer:

Your answer is D. All of the above

Explanation:

They are all the same answers just worded differently.

If a compound rotates plane-polarized light in a clockwise direction, the compound is called dextrorotatory, and is labeled d

If a compound rotates plane-polarized light in a anti- clockwise direction, the compound is called levorotatory compound is labeled as l.

An enantiomers rotate the plane polarized light in clockwise direction or positive direction is called dextrorotatory. given as [(+), d- ]. while enantiomers that rotates plane polarized light in anti - clock wise direction or negative direction is called levorotatory compound . given as [ (-) , l-].

Thus, If a compound rotates plane-polarized light in a clockwise direction, the compound is called dextrorotatory, and is labeled d

If a compound rotates plane-polarized light in a anti- clockwise direction, the compound is called levorotatory compound is labeled as l.

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