pls answer question will mark brainliset tyty

Answer:

a) Air

Explanation:

Air from the following is a renewable resource, fossil fuels and minerals cannot be renewed. Hence, option (a) is correct.

There are 1.5 moles of water present.

We know that according to the work of Avogadro, the number of moles of the water molecule can be obtained. According to his work, one mole of the water molecule can be able to have about 6.02* 10^23 molecules of water. This is thus the number of molecules in one mole of water and it can be  used to obtain the number of moles of water at any point.

If 1 mole of water contains 6.02* 10^23 molecules of water

x moles of water contains 9.01 x 10^23 molecule of water

x = 9.01 x 10^23 molecule * 1 mole/ 6.02* 10^23 molecules

x = 1.5 moles

Thus we can see that the number of moles of water that is present is 1.5 moles in the  9.01 x 10^23 molecules of water present here.

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Answer:

There are legal and ethical restrictions regarding human cloning.

Explanation:

Answer:

Scientists clone banana plants and not humans because there are legal and ethical restrictions regarding human cloning.

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Answer:

The specific heat of iron is 0.449 J/g°C.

Explanation:

First, let's see the formula of specific heat:

Now, we have to replace the given data in the formula, where q = 8980 J, m = 200 g and ΔT = Final temperature - Initial temperature = 120 °C - 20 °C = 100 °C:

The specific heat of iron is 0.449 J/g°C.

The statement the genetic code of all living organisms is universal explains why some microorganisms have the ability to repair a malfunctioning gene by using the human version of the gene (Option C).

The genetic code is a set of instructions to encode protein by using specific triplets of nucleotides or codons, which indicate particular amino acids that will be added during translation.

Therefore, with this data, we can see that the genetic code is a group of instructions to produce proteins that are conserved in the tree of life.

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Answer:

The density of the mystery metal is 2.7g/cm^3.  It is likely aluminum, Al.

Explanation:

Density is defined as (mass/unit volume).  We know the volume of the metal sample by the fact it displaced 6.2 ml of water.  Since the mateal sample had a mass of 16.74 grams, we find the density by dividing the mass by the volume:

Density = (mass)/(volume) = (16.74g)/(6.2ml)

Density = 2.7 g/ml

Note that the ubntis for density can vary greatly. kg/cm^3 is a possible unit.

since 1 ml = 1 cm^3, we can also say the density of the metal sample is 2.7 g/cm^3.  [This is a more common unit for this type of measurement]

A reference book of densities can be search to find what metals have this density.  See the attached excerpt form one such table.

While not definitive, it can be seen that aluminum, Al, is a good candidate for the ID of this metal.  It has a density of 2.7 g/cm^3, although different forms may deviate slightly.  The metal is most likely aluninum.

Based on the temperature change and specific heat of chloroform, the initial temperature will be found as follows:

The change in the temperature of chloroform after it absorbs  1000.0 joules of heat is determined using the formula below:

Hence;

Temperature change = heat absorbed / (mass * specific heat capacity)

The heat absorbed = 1000 Joules

mass of chloroform = 150.0 g

specific heat of chloroform =  0.96 J/g.C

Temperature change = 1000 / (150 * 0.96)

Temperature change = 6.9 °C

Also:

Temperature change = Final temperature - Initial temperature

Initial temperature = Final temperature - Temperature change

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The value of x in the gas C₅Hx is 12.

Calculation:-

PV = nRT

n = PV/RT

  = 2 × 0.32 /  0.08 × 400

 =  0.64 / 32

  = 0.02

mole = mass/molar mass

molar mass = mass/ mole

= 1.44/0.02

= 72 grams.

C5Hx = 72

12 × 5 + x = 72

x = 72 - 60

x = 12

An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.

An ideal gas is described as one for which both the extent of molecules and forces between the molecules are so small that they have got no effect on the behavior of the gas. The real gas that acts almost like a really perfect gasoline is helium. that is due to the fact helium, in contrast to maximum gases, exists as an unmarried atom, which makes the van der Waals dispersion forces as low as viable.

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Answer:

0.0899 moles of oxygen (O2).

Explanation:

What is given?

Mass of sodium oxide (Na2O) = 11.15 g.

Molar mass of Na2O = 62 g/mol.

Step-by-step solution:

First, let's state the balanced chemical equation:

Let's calculate the moles of Na2O that are in 11.15 g of Na2O, using its molar mass:

Now that we have the moles of Na2O, let's do the stoichiometry: you can see in the chemical equation that 1 mol of oxygen (O2) reacted produces 2 moles of Na2O, so by doing a rule of three based on this data, the calculation will look like this:

The answer is that we need 0.0899 moles of oxygen (O2) to produce 11.15 g of sodium oxide.

Answer:

They have two valence electrons and enter into reactions where they can donate their two valence electrons

Explanation:

Here, we want to predict the number of valence electrons

The elements belong to the group 2 of the periodic table

Elements in the periodic table are placed in groups based on the number of valence electrons they have

It is expected that elements in group 2 of the periodic table have 2 valence electrons

Their reactivity is that, they react with other atoms by donating this two valence electrons. They then achieve the electronic configuration of the noble gas in the last period

Physically or chemically, elements cannot be reduced farther since they are the most basic form of matter. A pure substance known as an element is one that has only one sort of atom.

their nuclear numbers of protons. The debate over the conceptual meaning of the word "element" offers a rather singular chance to look at how chemists currently relate to one atom.

A chemical approach is one that aims to alter the chemical make-up of the waste's constituent elements. Using 1 papers, Sample 1 Examples of using the chemical technique in a phrase In the chemical atom used in wastewater treatment, pollutants are taken out of the wastewater and released through discharge outlets.

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E3 is least transition of an electron in the hydrogen atom emits a photon with the smallest amount of energy.

A hydrogen atom is an atom belonging to the element hydrogen in chemistry. One positively charged proton and one negatively charged electron are both present in the electrically neutral atom and are held to the nucleus by the Coulomb force. Normal circumstances are infrequent for lone neutral hydrogen atoms. Hydrogen atoms can also exist in cationic and anionic states, however neutral hydrogen is frequently seen when it is covalently joined to another atom.

Energy is the quantifiable attribute that is transferred to a body or a physical system in physics. It is observable in the production of work as well as in the form of heat and light. The law of conservation of energy asserts that although energy can be changed in form, it cannot be created or destroyed. Energy is a conserved quantity.

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Answer:

Explanation:

Here, we want to get how the final digit in a measurement is obtained

Mathematically, the final digit can be obtained by estimation

Hence, we say that the value is uncertain

The final digit is obtained by a mark or between the last mark and the next mark in a measurement

Thus, we call this value uncertain since it is estimated

Answer:1. How many moles is 400.0 g of Al 2(SO4)3?

Mol = mass/molar mass

Mol = 400.0g/342g/mol = 1.169 mol

2. Which is the percent composition of bromine in the compound NaBr?

% Br = (mass Br/mass NaBr) x 100

% Br = (79.90g/102.88g) x 100 = 77.7%

3.How many molecules are in 3.6 grams of NaCl?

Molecules NaCl = 3.6g NaCl x 6.02 x 1023 NaCl molecules = 3.7 x 1022 molecules

58.43g NaCl

4.How many grams are in 1.946 moles of NaCl?

From Mol = mass/molar mass,

Mass = mol x molar mass

Mass NaCl = 1.946 mol x 58.43 g = 113.7 g

Explanation:

Option g. formic propanoic anhydride.

Propionic anhydride is an organic compound with the system CH₃CH₂CO₂O. This easy acid anhydride is a colorless liquid. it is a broadly used reagent in natural synthesis in addition to producing distinctive derivatives of cellulose.

Propionic Anhydride is a colorless liquid with a very sturdy, unpleasant smell. it's far used in the manufacture of perfumes, oils, resins, dyestuffs, drugs, and cellulose esters.

Anhydrides react with alcohols to form esters as the main product and carboxylate as a facet product. The response is generally run with a base, such as NaOH or pyridine, to take away any acid produced.

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Answer:

SO2

Explanation:

SO2 causes acid rain which is leading to dissolving of the marble on the Taj Mahal

SO2 reacts with water to come down as sulfuric acid during acid rains

The ph of the solution after 40. 3 ml of NaOH have been added to the acid is 10.

Titration is a commonplace laboratory technique of quantitative chemical analysis to determine the attention of an identified analyte. A reagent, termed the titrant or titrator, is ready as a trendy answer of recognized awareness and extent.

Calculation:-

Normality of acid                                                normality of base

= nMV                                                                        nMV

= 1 × 0. 30 × 0.02                                               1 ×  0. 15 ×0.0403 L

= 6 × 10⁻³                                                             = 6.1 × 10⁻³

overall base will be high

net concentration = 6.1 × 10⁻³ - 6 × 10⁻³

                              = 0.1 × 10⁻³

                              = 1 × 10⁻⁴

p0H = -log[1 × 10⁻⁴]

     = 4

pH = 14 - 4

       = 10

A titration is defined as 'the manner of determining the amount of a substance A by using adding measured increments of substance B, the titrant, with which it reacts till precise chemical equivalence is completed the equivalence factor.

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The mass of [tex]Ag_2SO_4[/tex] precipitate that would be formed would be 23.38 grams.

Aqueous [tex]AgNO_3[/tex] and aqueous [tex]Na_2SO_4[/tex] combine in a chemical reaction to form   [tex]Ag_2SO_4[/tex] precipitate according to the following equation:

[tex]2AgNO_3 + Na_2SO_4 -- > Ag_2SO_4 + 2NaNO_3[/tex]

From the equation of the reaction, the mole ratio of the two reactants is 2:1.

Stoichiometrically, it means 2 moles of [tex]AgNO_3[/tex] require 1 mole of [tex]Na_2SO_4[/tex] for a complete reaction.

Recall that: mole = molarity x volume

Thus:

                                                 = 0.15 moles

                                                 = 0.075 moles

This means that the two reactants are stoichiometrically balanced.

Mole ratio of [tex]Na_2SO_4[/tex] and [tex]Ag_2SO_4[/tex] = 1:1

Thus, the equivalent mole of [tex]Ag_2SO_4[/tex] will be 0.075 moles.

The molar mass of [tex]Ag_2SO_4[/tex] = 311.799 g/mol

Mass of 0.075 moles [tex]Ag_2SO_4[/tex] = 0.075 x 311.799

                                                 = 23.38 grams

In other words, the mass of [tex]Ag_2SO_4[/tex] that will precipitate from the reaction would be 23.38 grams.

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Consider a galvanic cell with a beaker of sulfuric acid and a beaker of nitric acid the sulfuric acid beaker contains a strip of tin, and the nitric acid cell contains a strip of platinum a wire runs between the strips then tin is the anode

Galvanic cell is the electrochemical cell that converts the chemical energy of spontaneous redox reactions into electrical energy

Here given data is galvanic cell with a beaker of sulfuric acid and a beaker of nitric acid the sulfuric acid beaker contains a strip of tin, and the nitric acid cell contains a strip of platinum a wire runs between the strips and the reaction is

3Sn(s) + 2NO₃⁻(aq) + 8H⁺(aq) → 3Sn²⁺(aq) + 2NO(g) + 4H₂O(l)

Then in the galvanic cell oxidation takes place at the anode means the tin is the anode

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Based on the balanced equation of the reaction of bauxite and carbon;

a. the limiting reagent is Al₂O₃ amd the excess reagent is carbon, C.

b. the theoretical yield of aluminum metal is 13.23 grams

c. the mass of the excess reactant left over is 6.18 grams

The balanced equation of the reaction of bauxite and carbon is given below as follows:

Al₂O₃ (s) + 3 C(s) ---> 2 Al (s) + 3 CO (g)

Based on the equation of the reaction, the mole ratio of the reactants is 1 mole of Al₂O₃ to 3 moles of C.

Mole of a substance = mass / molar mass

Moles of Al₂O₃ in 25.0 g sample = 25 / 102

Moles of Al₂O₃ = 0.245 moles

Moles of C in 15.0 grams sample = 15 / 12

Moles of C in 15.0 grams sample = 1.25 moles

moles of C required = 0.245 * 3

moles of C required = 0.735 moles

Based on the mole ratio, C is the excess reactant and the limiting reagent is Al₂O₃

The theoretical yield of aluminum will be calculated from the mole ratio of Al₂O₃ and Al as follows:

Theoretical yield of Al = 0.245 * 2/1 * 27 g

Theoretical yield of Al = 13.23 grams

Moles of C leftover = 1.25 - 0.735

Mass of C left over = (1.25 - 0.735) * 12 g

Mass of C left over = 6.18 grams

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A base, according to the Arrhenius definition, is any species that increases the concentration of OH- in the solution. Some examples of bases are, NaOH, KOH, LiOH, all these substances will increase the concentration of OH when dissolved. Letter C

Sodium- will loose electron

Silicon - could loose or gain electrons

Oxygen - wil gain electron

Argon - does not gain or loose electron

Explanations

Sodium is a group 1 elements. All group 1 elements have 1 valence electron in their outermost shell which they can easily loose to other atoms to form a stable octet configurations. Hence Sodium will loose electron.

For silicon, it forms a covalent bond with other non metals. Therefore it could loose or gain electrons.

Oxygen is known as one of the electronegative element with 6 valence electrons in its outer shell. This shows that oxygen will need 2 electrons to form a stable octet configuration. Therefore, Oxygen will gain electrons.

Elements that can neither loose nor gain electrons are known to be inert in nature since their outer shell is already complete. Since Argon is inert due to astable configuration, hence it does not gain or lose electrons

The frequency of a wave is  2.80 × 10¹⁸  Hertz.  The wavelength is 0.10 nm and energy of this wave is  2.80 × 10¹⁸ .

Given that :

The frequency of a wave, v = 2.80 × 10¹⁸ Hz

wavelength = ?

formula for the wavelength is given as follows :

λ = c/ v

c = speed of light

λ = 3 × 10⁸ m/s /  2.80 × 10¹⁸ s⁻¹

λ = 1.07 × 10⁻¹⁰ = 0.10 nm

Energy of wave = h v

h = planks constant

E = 6.626 × 10⁻³⁴ J.s × 2.80 × 10¹⁸  s⁻¹

E = 18.55 × 10 ⁻¹⁶ J

Thus, The frequency of a wave is  2.80 × 10¹⁸  Hertz.  The wavelength is 0.10 nm and energy of this wave is  2.80 × 10¹⁸ .

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The substances in order of lowest to highest density will be H2O<air < Al < steel < Fe< Ag < Au

Density is called as the mass contained per unit volume.

The formula for density :

d=m/V

d is density

m is mass

V is volume

This leads us to the conclusion that a substance's mass and volume affect its density.

Given that it is independent of the amount of substance, density is known to be an intense attribute. It stays the same.

So density is fixed for any substance.

The density of iron = 7.86 g/mL

The density of gold = 19.3 g/mL

The density of steel = 7.8 g/mL

The density of water = 1.00 g/mL

The density of air = 1.29 g/mL

The density of silver = 10.5 g/mL

The density of aluminium = 2.70 g/mL

From this we observe that the order of density from lowest density to highest density will be:

water < air < aluminum < steel < iron < silver < gold

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Answer:

A.) The reaction rate decreased.

Explanation:

Let's review the rate law based on the effect on concentration on reactions: typically, reaction rates decrease with time because reactant concentrations decrease as reactants are converted to products. Reaction rates generally increase when reactant concentrations are increased.

Based on this logic, the reaction rate when the concentration of reactants is decreased, this would have a decreased too. The answer would be A.) The reaction rate decreased.

The geothermal energy production indicates that the crust in these regions is heated by nearby magma.

What is geothermal energy?

The geothermal energy is the heat that comes from the sub-surface of the earth which is contained in the rocks and fluids beneath the earth's crust. It is important because unlimited amount of energy is found in earth's crust which is the source of geothermal energy.

The magma is present in the mantle and lower crust which heats up nearby rocks and underground aquifers. By this hot water can be released through steam vents, hot springs, geysers and mud pots etc. these can be used as the sources of geothermal energy.

Therefore, the geothermal energy production indicates that the earth's crust is heated by nearby magma. So, the correct option is B.

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One liter of this solution could be converted into a buffer by the addition of 0.25mol NH₄Cl, and 0.12 mol HCl.

A buffer is a substance that can withstand a pH change when acidic or basic substances are added. Small additions of acid or base can be neutralized by it, keeping the pH of the solution largely constant. For procedures and/or reactions that call for particular and stable pH ranges, this is significant. The pH range and capacity of buffer solutions determine how much acid or base can be neutralized before pH changes and how much pH will vary.

A weak acid and its conjugate base, or vice versa, are combined in solution to form a buffer.

The conjugate base of ammonia (NH3), which is a weak base, is NH4+. Therefore, adding 0.25 mol of NH4Cl will change the solution into a buffer. Additionally, NH3 and HCl interact to form NH4+. Therefore, 0.12 mol of HCl added will result in NH4+. All of the NH3 is consumed by 0.25 mol HCl.

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People get the chemical potential energy stored by plants is solar energy in sugar

Chemical energy is stored in the bond that connect atom with other atom and molecule with other molecule and because chemical reaction takes place the stored chemical energy is released and plant store this solar energy as chemical energy in sugar means glucose within cell in leaves called as chloroplast and these cells are full of chlorophyll that help absorbs light

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Two sodium ions and one phosphate ion are needed to form an ionic compound named sodium phosphate [tex]Na_{3}PO_{4}[/tex].

These two polyatomic ions require opposite charges that are both equivalent to form a bond. As a result, the one -3 phosphate ion needs to be balanced by three +1 sodium ions.

A chemical compound known as an ionic compound in chemistry is one that contains ions held together by the electrostatic forces known as ionic bonding. Despite having both positively and negatively charged ions, or cations and anions, the compound is overall neutral.

Thus in sodium phosphate sodium is the cation and phosphate is the anionic.

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