CHEMISTRY HIGH SCHOOL

Which term describes the point when two objects reach the same temperature and there is no longer a transfer of energy through heat?1. Latent Heat
2.specific Heat
3.thermal equilibrium
4.Heat of Fusion

Answers

Answer 1
Answer:

Answer: Option (3) is the correct answer.

Explanation:

When two substances or objects at the same temperature do not exchange heat with each other then this state is known as thermal equilibrium.

Whereas latent heat is the release or absorption of energy at a constant temperature.

Specific heat is the amount of heat per unit mass necessary to increase the temperature by one degree Celsius.

Heat of fusion is the amount of energy required to change the state of matter or substance.

Thus, we can conclude that out of the given options, thermal equilibrium describes the point when two objects reach the same temperature and there is no longer a transfer of energy through heat.
Answer 2
Answer: C. Thermal Equilibrium

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How to figure out if compounds are electrolytes

Answers

An electrolyte is a compound that dissolved into its ions when placed into a solvent such as water (the ions can carry an electric charge). An easy way to test whether something is an electrolyte is by placing the substance in Deionized water and testing if the resulting solution can carry a current. If the resulting solution can carry a current, the substance is an electrolyte. I hope this helps. Let me know if anything is unclear.

How many grams of KNO3 would recrystallize from 100 g of water, if a saturated solution were cooled from 50 degrees celcius to 20 degrees celcius?

Answers

Answer:

m_(cryst)=58g

Explanation:

Hello there!

In this case, according to the attached solubility chart, it is possible for us to realize that about 88 grams of KNO3 are soluble at 50 °C but just 30 grams are soluble at 20 °C in the same 100 g of water.

In such a way, the crystalized mass of this solute can be calculated by subtracting the mass at 50 °C and the mass at 20 °C:

m_(cryst)=88g-30g\n\nm_(cryst)=58g

Best regards!

In your own words, what is an isotope

Answers

Answer:

It is a chemical element with an atomic number.

Find the [H+] in an acetic acid solution that has a pH of 5.12

Answers

Data:
pH = 5.2
[H+] = ?

Knowing that: (Equation to find the pH of a solution)
pH = -log[H+]

Solving:
pH = -log[H+]
5.2 = - log [H+]
Knowing that the exponential is the opposite operation of the logarithm, then we have:
[H+] = 10^(-5.2)
\boxed{\boxed{[H+] = 6.30*10^(-6)}}\end{array}}\qquad\quad\checkmark

What are the trends for ionic size among the cations and anions?

Answers

Cations are smaller than the atoms from which they are formed. Anions are larger than the atoms from which they were formed. Ionic size increases from top to bottom down a group of elements in the periodic table.

Using the balanced equation below, how many grams of cesium fluoride would be required to make 73.1 g of cesium xenon heptafluoride?CSF + XeF6 → CsXeF7

Answers

Answer:

27.9 g

Explanation:

CsF + XeF₆ → CsXeF₇

First we convert 73.1 g of cesium xenon heptafluoride (CsXeF₇) into moles, using its molar mass:

  • Molar mass of CsXeF₇ = 397.193 g/mol
  • 73.1 g CsXeF₇ ÷ 397.193 g/mol = 0.184 mol CsXeF₇

As 1 mol of cesium fluoride (CsF) produces 1 mol of CsXeF₇, in order to produce 0.184 moles of CsXeF₇ we would need 0.184 moles of CsF.

Now we convert 0.184 moles of CsF to moles, using the molar mass of CsF:

  • Molar mass of CsF = 151.9 g/mol
  • 0.184 mol * 151.9 g/mol = 27.9 g
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