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frez [133]
2 years ago
5

A jar is filled to the top with water, and a piece of cardboard is slid over the opening so that there is only water in the . If

the jar is now turned over, will the cardboard fall off? What will happen if there is any air in the jar?
Chemistry
2 answers:
aivan3 [116]2 years ago
7 0

Answer:

it will all fall unless these is air

Explanation:

Rom4ik [11]2 years ago
3 0

Answer:

If you do it carefully enough, a small amount of water will pour out of the glass — that's supposed to happen. But try not to let any air bubbles get into the glass. Finally, slowly remove the hand holding the cardboard in place.

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Ba(OH)2 Ba+2 + 2 OH- (dissolved in solution). Which will NOT happen to the equilibrium of this solution as H+ ions are added? H+
prohojiy [21]

Answer:

The reaction will move to the left.

Explanation:

  • For the reaction:

<em>Ba(OH)₂ = Ba²⁺ + 2OH⁻,</em>

<em>Ba(OH)₂ is dissociated to Ba²⁺ and 2OH⁻.</em>

  • If H⁺ ions are added to the equilibrium:

H⁺ will combine with OH⁻ to form water.

<em>So, the concentration of OH⁻ will decrease and the equilibrium is disturbed.</em>

<em />

<em>According to Le Châtelier's principle: </em>when there is an dynamic equilibrium, and this equilibrium is disturbed by an external factor, the equilibrium will be shifted in the direction that can cancel the effect of the external factor to reattain the equilibrium.

  • So, the reaction will move to the right to suppress the effect of decreasing OH⁻ concentration.

  • The base will dissociate to form more OH⁻ and thus, the quantity of Ba(OH)₂ will decrease.

<em>So, the right choice is: the reaction will move to the left, is the choice that will not happen to the equilibrium.</em>

5 0
2 years ago
What is the mass of a block with a volume of 18 cm^3, and a density of 9.2 g/cm^3?
Semmy [17]

Answer: 165.6grams

Explanation:

Mass of a block = ?

Volume of block = 18 cm^3

Density of block = 9.2 g/cm^3

The density of any object depends on its mass and volume.

i.e Density of block = Mass / volume

9.2 g/cm^3 = Mass / 18 cm^3

Mass = 9.2 g/cm^3 x 18 cm^3

= 165.6 g

Thus, the mass of the block is 165.6grams

6 0
3 years ago
Which bond is the weakest????<br> Please hurry!!,<br> I’ll put a pic.
sammy [17]
B because it’s got the least connections
5 0
2 years ago
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What will happen if a large quantity of NaCl is added to the aqueous solution?
vlabodo [156]
It will explode...............
5 0
3 years ago
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A mixture of He and Ne at a total pressure of 0.95 atm is found to contain 0.32 mol of He and 0.56 mol of Ne. The partial pressu
dangina [55]

Answer:

Partial pressure of Ne is 0.61 atm.

Explanation:

Mole fraction of a gas (x) in mixture = (no. of moles of the gas in mixture)/(total no. of moles of gases in mixture)

Here, total no. of moles of gases = (0.32 + 0.56) moles = 0.88 moles

So, mole fraction of Ne in mixture, x_{Ne}=\frac{0.56}{0.88}=0.64

Let's assume both He and Ne along with their mixture behaves ideally,

Hence, in accordance with Dalton's law of partial pressure-

                     P_{Ne}=x_{Ne}\times P_{total}

Where, P_{Ne} and P_{total} are partial pressure of Ne and total pressure respectively.

So,  P_{Ne}=(0.64)\times (0.95atm)=0.61atm

So, partial pressure of Ne is 0.61 atm.

4 0
3 years ago
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