What forces must be overcome for a substance to melt

Ca(OH)2 is added to a large beaker of water. How is the solution different from the original water?

Anuta_ua [19.1K]

When Ca(OH)₂ is added to a beaker of water the solution would turn phenolphthalein pink. Phenolphthalein is a common indicator and is only pink when in basic solutions. By adding calcium hydroxide, you are turning the solution into a basic solution since the concentration of OH⁻ ions is going up and therefore any phenolphthalein in solution would turn pink.
(answers A,C, and D would happen if you added an acid to the water such as HCl)
I hope this helps. Let me know if anything is unclear.

6 0

3 years ago

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What does the kinetic theory state about the relationship between the speed and temperature of gas molecules?

mario62 [17]

The kinetic theory state about the relationship between the speed and temperature of gas molecules "As the temperature increases, the speed of gas molecules increases".

Option: C

Explanation:

The temperature relates to a gas, according to the kinetic theory of gases, influences the rate of motion of the gas particles. The higher the gas temperature, the faster the gas particles are moving; the reverse is true, too.

This is because the gas particles gain more kinetic energy as the temperature of the gas increases, and therefore move faster and collide more with each other and the container walls.The rate of a gas's molecules is proportional to the temperature, and is inversely proportional to the gas's molar mass.

5 0

3 years ago

When the free-energy change (AG) of a reaction is negative, the reaction is said to be: Endergonic Non spontaneous Spontaneous E

Greeley [361]

Answer:

Spontaneous

Explanation:

For a spontaneous reaction , the value for the change in free energy or gibbs' free energy is negative .

The change in free energy , i.e. , ΔG , denotes the maximum amount of usable energy released , as going from initial state , i.e. , the reactant towards the final state , i.e. , the product .

And , the sign of the ΔG , determines whether the reaction is Spontaneous or non Spontaneous or at equilibrium ,

i.e. ,

if

ΔG < 0 , the reaction is Spontaneous

ΔG > 0 , the reaction is non Spontaneous

ΔG = 0 , the reaction is at equilibrium

For ,

ΔG < 0 , that the reaction proceed without any energy input , hence , it is Spontaneous in nature .

6 0

3 years ago

Of a cell membrane allows it to control material Entering and leave a cell?

Nata [24]

Answer:

The cell membrane is the outer layer of the cell. The primary function of the cell membrane is to regulate what substances enter and leave the cell. The cell membrane is selectively permeable, or "semi-permeable", meaning that the membrane only allows certain substances to enter or leave the cell.

Explanation:

already had this question and this is the correct answer

4 0

3 years ago

A solution is made

Anna11 [10]

Answer:

99.3%

Explanation:

The percent by mass of the solute can be expressed as:

% mass = $\frac{MassSolute}{MassSolute+MassSolvent}$ * 100%

And for this problem:

Mass of Solute = Mass of sodium lithium chloride = 29 g

Mass of Solvent = Mass of Water

So to calculate the percent by mass first we need to calculate the mass of water, to do so we use its density (1 g/L):

202 mL is equal to (202/1000) 0.202 L.

Density water = mass water / volume

1 g/L = mass water / 0.202 L

Mass water = 0.202 g

Now we have all the data required to calculate the % mass:

% mass = $\frac{29g}{29g+0.202g}$ * 100 % = 99.3%

3 0

3 years ago

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