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3 years ago

PLSS helpp me!!! Plsss

Chemistry

1 answer:

Vikentia [17]3 years ago

7 0

0.05 liters of 0.40 M calcium chloride solution

Explanation:

We have the following chemical reaction:

Na₂CO₃ + CaCl₂= 2 NaCl + CaCO₃

Chalk is calcium carbonate CaCO₃.

number of moles = mass / molecular weight

number of moles of CaCO₃ = 2 / 100 = 0.02 moles

From the chemical reaction we see that 1 mole of calcium chloride (CaCl₂) produces 1 mole of calcium carbonate (CaCO₃), so to produce 0.02 moles of calcium carbonate (CaCO₃) we need 0.02 moles of calcium chloride (CaCl₂).

molar concentration = number of moles / volume (L)

volume = number of moles / molar concentration

volume of calcium chloride solution = 0.02 / 0.4 = 0.05 liters

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molar concentration

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NaOH was titrated to the phenolphthalein endpoint with a known concentration of HCl. The student conducting the experiment place

GarryVolchara [31]

Answer:

The concentration of NaOH solution is 3,65M

Explanation:

The neutralization of NaOH with HCl is:

NaOH + HCl → NaCl + H₂O

You are titrating 12,67 mL HCl 2,74M with your NaOH solution, the moles of HCl in the beaker are:

12,67 mL ≡ 0,01267L× $\frac{2,74 moles}{1L}$ = 0,0347 moles HCl ≡ 0,0347 moles NaOH

The volume that you require for total neutralization of 12,67 mL HCl 2,74M is:

13,65 mL - 4,50 mL = 9,50 mL ≡ 0,0095L

Thus, the concentration of NaOH solution is:

$\frac{0,0347 moles}{0,0095L}$ = 3,65M

I hope it helps!

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4 years ago

A 93-L sample of dry air is cooled from 145 oC to -22 oC at a constant pressure of 2.85 atmospheres). What is the final volume?

Aloiza [94]

Answer: 55.84L

Explanation: Please see attachment for explanation.

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3 years ago

The speed of light is 3.0 x 10^8 m.s^-1. what is the speed in nm.ms^-1 ?

snow_lady [41]

Answer:

$c=3\times 10^{17}\ nm/s$

Explanation:

The speed of light is $3\times 10^8\ m/s$ . It is required to convert it into nm/s.

The relation between nm and m is as follows :

$1\ nm=10^{-9}\ m\\\\1\ m=10^9\ nm$

So,

$c=3\times 10^8\ m/s \\\\c=3\times 10^8\times 10^9\ nm/s\\\\c=3\times 10^{17}\ nm/s$

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3 years ago

If the forces acting on an object are unbalanced, what will occur?

S_A_V [24]

Answer:

The answer is acceleration.

Explanation:

Acceleration- When it comes to science, Force is defined as a "push or pull" of an object with mass that causes it to change velocity.

Balanced Force- This occurs when two forces of the same mass or size are acting on a particular object in opposite direction. The object being acted upon could either stay in its place or move in a uniform speed and direction.

Unbalanced Force- This occurs when the forces applied are not equal and are of different direction. For example, a 55-kg person pulling a 30-kg cart. The cart will move to the direction of the pull.

Thus, when forces acting on an object are unbalanced, it causes the object to accelerate. This acceleration is directly proportional to the "net force", but is inversely proportional to the mass or size.

A net force is the total amount of force that is acting on the object.

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3 years ago

Which of the following is a correct formula unit of an ionic compound?

goldenfox [79]

Answer : The correct formula unit of an ionic compound is Ca(OH)2

Explanation :

An ionic compound is formed when a metal atom donates one or more electrons to a non metal atom.

During this process, metal gains a positive charge and a nonmetal gets a negative charge.

In an ionic compound, these charges on the ions are balanced so that the overall compound is neutral.

Let us check which of the given compounds have a neutral charge.

1) Al2F3 : Charge on Al is +3 and that on F is -1.

The total charge on 2 Al is 2x3 = +6.

The total charge on 3 F atoms is 3x(-1) = -3

The overall charge on the compound is +6-3 = +3.

That means the given formula unit is not correct.

2) Ca2O : Charge on Ca is +2 and that on O is -2

Total charge on Ca is 2x2 = +4

The overall charge is +4-2 = +2

Therefore the given formula unit is not correct.

3) Ca(OH)2 : The charge on Ca ion is +2 and that on OH is -1.

The total charge on 2 OH ions is 2x(-1) = -2

The overall charge is +2-2 = 0

This gives a neutral compound.

Therefore the given formula unit is correct.

6 0

4 years ago

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