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3 years ago

How does a physical change obey the law of conservation of mass?

1 answer:

5 0

Let's consider water.
Regardless of what form it turns into, the mass should remain the same.
It's the same H20.
Add some heat and it becomes water vapor,
cool it down a bit and it becomes ice.
if you make it just right, it becomes water again.

A chemical change would involve the one or more element(s) changing into a different solution all together.
It cannot be reversed unless you use electrolysis or some other method.

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How many moles of ions are produced by the dissociation of 1 mol of al2(co3)3?

zloy xaker [14]

Aluminium Carbonate on Dissociation produces Aluminium Ions and carbonate Ions as follow,

Al₂(CO₃)₃ → 2 Al⁺³ + 3 CO₃⁻²

Result:
On dissociation Al₂(CO₃)₃ produces FIVE Ions in total. The Ions produced and there number are as follow;

Al⁺² = 2

CO₃⁻² = 3

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3 years ago

For a reversible reaction, what would a large equilibrium constant indicate?

siniylev [52]

(D) At equilibrium, the concentration of the products will be much higher than the concentration of the reactants.

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3 years ago

What volume, in milliliters, of calcium chloride 15.0 M stock solution would you use to

Kamila [148]

<u>Answer:</u> The volume of stock solution of calcium chloride required is 10 mL.

<u>Explanation:</u>

A solution consists of solute and solvent. A solute is defined as the component that is present in a smaller proportion while the solvent is defined as the component that is present in a larger proportion.

To calculate the amount of solute needed, the formula used is:

$C_1V_1=C_2V_2$ ....(1)

where,

$C_1\text{ and }V_1$ are the concentration and volume of stock solution of calcium chloride

$C_2\text{ and }V_2$ are the concentration and volume of diluted solution of calcium chloride

Given values:

$C_1=15.0M\\C_2=0.300M\\V_2=500mL$

Plugging values in equation 1:

$15.0\times V_2=0.300\times 500\\\\V_2=10mL$

Hence, the volume of stock solution of calcium chloride required is 10 mL.

7 0

2 years ago

<img src="https://tex.z-dn.net/?f=what%20%5C%3A%20is%20%5C%3A%20photosynthesis%3F%3F%3F%20%5C%5C%20anyone%20%5C%3A%20zinda%20%5C

nevsk [136]

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Explanation:

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2 years ago

Read 2 more answers

A student has to create a model of a convex lens. Which property of a convex lens should the student include in the model?

Zepler [3.9K]

Answer:

A. The lens spreads light.

Explanation:

The convex lens will converge the light that passes through it. The direction of light will be bend to be closer to the middle point. This is the lens used for the eyeglass that treat people with hypermetropia. That is why the convex lens also called a converging lens or a plus lens. The strength of the convex lens depends on its focal length, index of the material used, and the radius of curvature.

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3 years ago