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2 years ago

CrO42-+2H+=Cr2O7^2-+H2O

Chemistry

1 answer:

vaieri [72.5K]2 years ago

8 0

Addition of NaOH will cause the equilibrium position to move to the left because of the removal of the hydrogen ions.

<h3>Equilibrium position</h3>

When changes in temperature, pressure or concentration is imposed on a reaction system in equilibrium, the system will readjust itself in order to annul the change.

This change occur when the equilibrium position is moved to the left or right. For the reaction, CrO4^2-+ 2H^+ ⇄ Cr2O7^2- + H2O, addition of NaOH will cause the equilibrium position to move to the left because of the removal of the hydrogen ions.

Learn more about equilibrium position: brainly.com/question/12546111

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Kinetic molecular theory is often used to describe conductors because as the_____ increases the thermal conductivity of the mate

Lilit [14]

The answer is actually B. Collisions

3 0

4 years ago

If you have 8.45 x 10^27 molecules of H2O, how many moles of water do you have?

il63 [147K]

Answer:

<h3>The answer is 14036.54 moles</h3>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

$n = \frac{N}{L} \\$

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question

N = 8.45 x 10^27 molecules of H2O

We have

$n = \frac{8.45 \times {10}^{27} }{6.02 \times {10}^{23} } \\ = 14036.544850...$

We have the final answer as

<h3>14036.54 moles</h3>

Hope this helps you

7 0

3 years ago

What mineral is most likely used to make the plumbing pipe?

oksano4ka [1.4K]

Copper is the mineral most likely used to make the plumbing pipe.
The other options are unlikely, as copper is the best for these kinds of pipes.

3 0

3 years ago

Hard water often contains dissolved Ca2+ and Mg2+ ions. One way to soften water is to add phosphates. The phosphate ion forms in

dalvyx [7]

Answer:

30 g

Explanation:

3CaCl₂ + 2Na₃PO₄ ⟶ Ca₃(PO₄)₂ + 6NaCl

Moles of CaCl₂ = <em>c</em>×<em>V</em> = 5.0 × 10⁻² × 2.0 = 0.100 mol

Moles of Na₃PO₄ = 0.100 × 2/3 = 0.0667 mol

Mass of Na₃PO₄ = 0.0667 × 163.94 = 10.9 g

———————————————————

3Mg(NO₃)₂ + 2Na₃PO₄ ⟶ Mg₃(PO₄)₂ + 6NaCl

Moles of Mg(NO₃)₃ = <em>c</em>×<em>V</em> = 8.5 × 10⁻² × 2.0 = 0.170 mol

Moles of Na₃PO₄ = 0.170 × 2/3 = 0.113 mol

Mass of Na₃PO₄ = 0.113 × 163.94 = 1 g

—————————————————

Total mass of Na₃PO₄ = 10.9 + 18.6 = 29.5 g

To two significant figures, mass = 30 g

6 0

3 years ago

The stopper-puncturing needle should be completely pushed into the evacuated tube:__________. A. after the vein is entered. B. w

brilliants [131]

Answer:

The correct answer is:

after the vein is entered (A.)

Explanation:

The procedure in the question describes venopuncture.

Venopuncture is the method of aseptically collecting blood into the right sample containers. Using a stopper-punturing needle and a vacuum tube, the following procedure is followed:

assemble the needle and hub (needle holder)
apply the tourniquet and examine the arm for palpable vein, palpate the vein
release the tourniquet and swab the collection site with 70% alcohol
allow the swab to dry
reapply the tourniquet
insert the stopper-puncturing needle (attached to hub) into the appropriate vein
after the vein is entered, the stopper-puncturing needle should be completely pushed into the evacuated (vacuum) tubes
blood will flow into the tube until vacuum is completely filled
pull out the tube and invert gently several times if the tube contains anticoagulants
place a gauze on the site of puncture (do not press down the gauze)
remove the needle and press down the gauze immediately
dispose the needle into the sharps container or appropriately
label the tubes.

6 0

3 years ago