A 1.0-gram piece of zinc reacts with 5 milliliters of HCl(aq). Which of these conditions of concentration and temperature would produce thegreatest rate of reaction?
(1) 1.0 M HCl(aq) at 20.°C
(2) 1.0 M HCl(aq) at at 40.°C
(3) 2.0 M HCl(aq) at at 20.°C
(4) 2.0 M HCl(aq) at at 40.°C

Answers

Answer 1

Answer:

Answer : The correct option is, $(4):2.0MHCl(aq)\text{ at }40^oC$

Explanation :

Le-Chatelier's principle : It states that the change in the variables of the reaction, the equilibrium will shift in that direction where the effect will be minimum.

The rate of reaction is directly related to the concentration of the reactants and the temperature of the reaction.

If the concentration of the reactant increases, the equilibrium will shift in the forward direction that means the rate of reaction increases and if the concentration of the reactant decreases, the equilibrium will shift in the backward direction that means the rate of reaction decreases.

If the temperature of the reaction increases then rate of reaction also increases and vice-versa.

Thus, the rate of reaction is greater at high concentration and temperature.

Hence, the correct option is, $(4):2.0MHCl(aq)\text{ at }40^oC$

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If 62.0 grams of magnesium metal (Mg) react with 55.5 grams of oxygen gas (O2) in a synthesis reaction, how many grams of the excess reactant will be left over when the reaction is complete? Be sure to write out the balanced equation for this reaction and to show all of your work.

Answers

The balanced chemical equation would be as follows:

Mg + O2 → MgO2

We are given the amounts of the reactants. We need to determine first which one is the limiting reactant. We do as follows:

62.0 g Mg (1 mol / 24.31 g ) = 2.55 mol Mg
55.5 g O2 ( 1 mol / 32 g ) = 1.74 mol O2 -----> consumed completely and therefore the limiting reactant

2.55 mol - 1.74 mol O2( 1 mol Mg / 1 mol O2 ) = 0.81 mol Mg excess

Answer:

14.1648 grams of oxygen gas will be left.

Explanation:

$2Mg +O_2\rightarrow 2MgO$

Moles of magnesium metal = $(62.0 g)/(24 g/mol)=2.5833 mol$

Moles of oxygen gas = $(55.5 g)/(32 g/mol)=1.7343 mol$

According to reaction, 2 mol of magnesium react with 1 mol of oxygen gas .

Then 2.5833 moles of magnesium will react with:

$(1)/(2)* 2.5833 mol=1.29165 mol$ of oxygen gas.

Moles of oxygen left unreacted =1.7343 mol - 1.29165 mol = 0.44265 mol

Oxygen gas is an excessive reagent.

Mass of 0.44265 moles of oxygen gas:

0.44265 mol × 32 g/mol = 14.1648 g

14.1648 grams of oxygen gas will be left.

The pH of a solution is 2.0. Which statement is correct? A)The pOH of the solution is 12.0. B)The concentration of OH- ions is 1.0 x 10-2 M. C)The concentration of H+ ions is 100.0 M. D)The pOH of the solution is 7.

Answers

The statement which is correct is the one stating that the pOH of solution is 12.0.

What is pOH?

pOH is defined as the measure of determining the alkalinity or basicity of the solution.It is also used for the determination of the concentration of the hydroxyl ions which are present in the solution.

Mathematically, it can be defined as the negative logarithm of the hydroxyl ion concentration present in a solution,that is,

pOH= -log(OH $^-$ )

It can be used for the purpose of an indicator for determining the alkalinity of the substance where the pH values lies above 7.It also finds application in determining the electrical conductivity as well.It is related to the pH by the equation,

pH+pOH=14

For determining the amount of corrosion ,pOH can be used as an indicator for an electrolyte's conductivity.Hence, it can be concluded that higher the pOH ,higher the alkalinity and higher is the amount of corrosion.

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The relationship of pH and concentration of H+ ion is pH = -lg[H+]. So the concentration of H+ is 10^(-2). And [OH-][H+]=10^(-14). pOH + pH = 14. So the right answer is A.

What is a metamorphic rock?

Answers

Metamorphic rock is a rock formation derived from the processing of other metamorphic rocks. Due to the high temperatures and pressures that exist in the interior of the Earth, the rocks undergo transformations in its structure and in its mineral composition.

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How many protons, neutrons, and electrons does uranium-235 have

Answers

Uranium-235 is composed of 92 protons, 143 neutrons, and 92 electrons.

What are electrons?

An electron is a negatively charged subatomic particle.

Uranium-235 is a naturally occurring isotope of uranium, an element characterized by having 92 protons in its nucleus.

As all uranium nuclei have 92 protons, the nucleus of a uranium-235 atom will also have 143 neutrons to give it a total atomic mass number of 235.

Thus, Uranium-235 is composed of 92 protons, 143 neutrons, and 92 electrons.

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Answer:

Uranium is element 92, so unionized, it has 92 protons and electrons. U-235 is an isotope with a total of 235 nucleons, so subtract 92 to get 143 neutrons.

Explanation:

Which list of radioisotopes contains an alpha emitter, a beta emitter, and a positron emitter?(1) C-14, N-16, P-32
(2) Cs-137, Fr-220, Tc-99
(3) Kr-85, Ne-19, Rn-222
(4) Pu-239, Th-232, U-238

Answers

Answer: The correct option is 3.

Explanation: Radioisotopes which emits alpha-particle are known as alpha-emitters. These radioisotopesundergo alpha-decay.

The radioisotopes which emits beta-particle $(_(-1)^0\beta )$ are known as beta-emitters. These radioisotopes undergo beta-minus decay. In this decay a neutron gets converted to a proton and an electron.

The radioisotopes which emits positron-particle $(_(+1)^0\beta )$ are known as positron-emitters. These radioisotopes undergo beta-plus decay. In this type of decay a proton gets converted to a neutron.

From the given options,

Option 1: All the three radioisotopes undergoes beta-minus decay.

Option 2: Cs-137 and Tc-99 radioisotopes undergo beta-minus decay.

Fr-220 is a radioisotope which undergoes alpha-decay.

Option 3: Radioisotope Kr-85 undergoes beta-minus decay.

$_(36)^(85)\textrm{Kr}\rightarrow _(37)^(85)\textrm{Rb}+_(-1)^0\beta$

Radioisotope Ne-19 undergoes positron decay.

$_(10)^(19)\textrm{Ne}\rightarrow _(9)^(19)\textrm{F}+_(+1)^0\beta$

Radioisotope Rn-222 undergoes alpha decay.

$_(86)^(222)\textrm{Rn}\rightarrow _(84)^(218)\textrm{Po}+_(2)^4\alpha$

Option 4: All the three radioisotopes undergoes beta-minus decay processes.

Hence, from the above information, the correct option is 3.

The answer is (3), they are β-, β+ and α decay mode. For (1), they are β-, β- and β- decay mode. For (2), they are β-, α and β-. For (4), they are α, α and α decay mode.

Is Ba(NO3)2 covalent or ionic

Answers

It is ionic..........

Answer:

Barium Nitrate ( Ba(NO3)2 ) is an Ionic bond.

Explanation:

Ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions, and is the primary interaction occurring in ionic compounds.

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