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3 years ago

Which change does not increase the speed of reaction between zinc and hydrochloric acid?

Chemistry

2 answers:

tankabanditka [31]3 years ago

5 0

When solid zinc is dropped into hydrochloric acid solution, it falls to the bottom due to its higher density. The reaction occurs at the surface of the zinc metal and generates hydrogen gas that bubbles up through the solution. You can tell that the rate increases because the rate of bubble formation increases. This will naturally occur because the reaction is exothermic and will warm the solution around the zinc metal. The higher temperature will increase the reaction rate.

If you want a more quantitative analysis of reaction rate, you can perform the experiment in a eudiometer tube that is inverted and completely filled with liquid. As the hydrogen gas collects in the tube you can measure its accumulated volume with time. That will allow you to determine an approximate kinetic rate law for the process. The rate law determined in this manner will suffer from error due to temperature and surface area changes as well as gas volume error due to water vapor. But, it is an interesting application of chemical kinetics.

Mademuasel [1]3 years ago

3 0

Any factor that causes molecules to collide more frequently speeds up the reaction rate. This is achieved by an increase of the reactants concentration, surface area, raised temp. , raised pressure of gaseous reactant, or an addition of catalysts to the reactant

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Cytokinesis happens differently for plant and animal cells. Both separate cytoplasm between two new daughter cells. However, whi

victus00 [196]

Answer:

animal cell

Explanation:

Cytokinesis -

It refers to the process of cell division, which takes place during mitosis, is known as cytokinesis.

The process of cytokinesis is different for animal cell and plant cell.

Where, in case of plant cell, a separation, known as cell plate is formed along the center of the parent cell, which is responsible for the separation of the cells.

Whereas, in case of animal cell, the plasma membrane contracts itself along the center, until the two daughter cells are separated from each other.

Hence, from the given information of the question,

The correct answer is animal cell.

7 0

3 years ago

2Fe(s) +3H2SO4(aq) →Fe2(SO4)3(aq) +3H2(g)When 10.3 g of iron are reacted with 14.8 moles of sulfuric acid, what is the percent y

Elden [556K]

Answer:

1040%

Explanation:

To solve this question we must convert the mass of Iron to moles in order to find limiting reactant. With limiting reactant we can find the theoretical moles of hydrogen and theoretical mass:

Percent yield = Actual yield (5.40g) / Theoretical yield * 100

Moles Fe -Molar mass: 55.845g/mol-:

10.3g * (1mol / 55.845g) = 0.184 moles of Fe will react.

For a complete reaction of these moles there are necessaries:

0.184 moles Fe* ( 3 mol H2SO4 / 2 mol Fe) = 0.277 moles H2SO4.

As there are 14.8 moles of the acid, Fe is limiting reasctant.

The moles of H2 produced are:

0.184 moles Fe* ( 3 mol H2 / 2 mol Fe) = 0.277 moles H2

The mass is:

0.277 moles H2 * (2.016g/mol) = 0.558g H2

Percent yield is:

5.40g / 0.558g * 100 = 1040%

It is possible the experiment wasn't performed correctly

7 0

2 years ago

Which of the following objects does not decompose?

Anettt [7]

B) Plastic Water Bottle

6 0

2 years ago

Read 2 more answers

Which of the following electron configurations gives the correct arrangement of the four valence electrons of the carbon atom in

Juliette [100K]

Answer:

D) $2s^12p^3$

Explanation:

Carbon.

The electronic configuration is -

$1s^22s^22p^2$

Thus, 2s orbital is fully filled and p orbital can singly filled 3 electrons. Thus, Carbon has 2 singly occupied orbitals.

But in methane, $CH_4$ it forms 4 bonds. So, 1 electron each from 2s orbital jumps to the next orbital in the p subshell.

Thus, the configuration is:-

$1s^22s^22p^2$

Thus, the valence electron configuration is:-

$2s^12p^3$

7 0

2 years ago

How many total moles of ions are released when the following sample dissolves completely in water? 6.188 x 10 21 formula units o

elixir [45]

Answer:

e. 3.08 x 10⁻² mol of ions.

Explanation:

Every 1.0 mole of any compound contains Avogadro's number of molecules (6.022 x 10²³).

We can get the no. of moles of NiCl₂ using cross multiplication:

1.0 mol NiCl₂ contains → 6.022 x 10²³ molecules.

??? mol NiCl₂ contains → 6.188 x 10²¹ molecules.

∴ The no. of moles of NiCl₂ = (1.0 mol)(6.188 x 10²¹ molecules)/(6.022 x 10²³ molecules) = 1.028 x 10⁻² mol.

NiCl₂ is ionized according to the equation:

NiCl₂ → Ni²⁺ + 2Cl⁻.

Which means that every 1.0 mol of NiCl₂ is ionized to produce 3.0 moles (1.0 mol of Ni²⁺ and 2 moles of Cl⁻).

∴ The total moles of ions are released = 3 x 1.028 x 10⁻² mol = 3.083 x 10⁻² mol of ions.

3 0

2 years ago