CHEMISTRY HIGH SCHOOL

Compared to a 0.1 M aqueous solution of NaCl, a 0.8 M aqueous solution of NaCl has a(1) higher boiling point and a higher freezing point
(2) higher boiling point and a lower freezing point
(3) lower boiling point and a higher freezing point
(4) lower boiling point and a lower freezing point

Answers

Answer 1
Answer: The correct answer is option 2. A 0.8 M aqueous solution of NaCl has a higher boiling point and a lower freezing point than a 0.1 M aqueous solution of NaCl. This is explained by the colligative properties of solutions. For the two properties mentioned, the equation for the calculation of the depression and the elevation is expressed as: ΔT = -Km and ΔT = Km, respectively. As we can see, concentration and the change in the property has a direct relationship.
Answer 2
Answer:

Answer:

(2) higher boiling point and a lower freezing point

Explanation:

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Questions about Ozone

When an atom of the unstable isotope Na-24 decays, it becomes an atom of Mg-24 because the Na-24 atom spontaneously releases:(1) an alpha particle
(2) a beta particle
(3) a neutron
(4) a positron

Answers

A sodium-24 (Na-24) atom has atomic number 11 and mass 24, while a magnesium (Mg) atom has atomic number 12 and mass 24. Therefore the only change is that a particle with (-1) atomic number and (0) mass must have been released by Na-24 to get Mg-24.
This description fits a beta particle, which has a (-1) atomic number and (0) mass.
(2) a beta particle, because and atom "moves up" one place in periodic table, and such thing happens when beta decay occurs.

Research about the reaction of baking soda and vinegar

Answers

Baking soda and vinegar react because of an acid-base reaction. The product of this creates carbon dioxide.

60/1 point
If you have 1.0 mole of each of the following compounds, which will have the most molecules?
Х
NI3 (nitrogen triiodide)
KCI (potassium chloride)
Lici (lithium chloride)
O C2H2 (ethyne)
O They all have the same number of molecules.
7
1/1 point
fn 35 moles of Iron (Fe)?

Answers

Answer:

6. They all have the same number of molecules.

7. 19.5 g

Explanation:

6. From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ molecules i.e

1 mole = 6.02×10²³ molecules

Considering the question given above, each compounds has just 1 mole. Thus, they will also have the same number of molecules.

7. Determination of the mass of iron (Fe)

Number of mole of Fe = 0.35 mole

Molar mass of Fe = 55.85 g/mol

Mass of Fe =?

Mass = mole × molar mass

Mass of Fe = 0.35 × 55.85

Mass of Fe = 19.5 g

Thus, the mass of 0.35 mole of iron (Fe) is 19.5 g

What do atoms form when they bond chemically?a. atom
b. mixture
c. solution
d. molecules

Answers

They form molecules which can be in solution form if diluted in water, but some do form solutions on exposure to the atmosphere i.e they are deliquescent like pellets of sodium hydroxide

Rita divides Avogadro’s number (approximately 6.022 mc002-1.jpg 1023) by 2.0550 to calculate the number of atoms in a sample. Which expression gives her result to the correct number of significant figures?

Answers

Here you have two numbers. Avogadro's number is given with four significant figures, while number 2.0550 is given with five significant figures. That means that your result must be shown with four significant figures. So, 6.022 * 10 ^ 23 / 2.0550 = 2.930 * 10 ^ 23, which has been rounded to four significant figures. Answer: 2.930 * 10 ^ 23

Answer:

Answer is B

Explanation: Trust

A 220.0-mL sample of helium gas is in a cylinder with a movable piston at 105 kPa and 275 K. The piston is pushed in until the sample has a volume of 95.0 mL. The new temperature of the gas is 310. K. What is the new pressure of the sample?(1) 5l.1 kPa(2) 216 kPa(3) 243 kPa(4) 274 kPa

Answers

4. This problem is really simple if you realize that you can use the combined gas law:

P1V1/T1 = P2V2/T2

Therefore, just substitute in and solve:

(105 kPa)(220.0 mL)/(275K) = ?kPa(95.0 mL)/(310 K)
Solve for ?
Answer is 274. kPa

The new pressure of the sample of helium gas in a cylinder with a movable piston is 274 kPa.

Option 4)274 kPa is the correct answer.

What is Combined gas law?

Combinedgas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

P₁V₁/T₁ = P₂V₂/T₂

Given the data in the question;

  • Initial volume V₁ = 220.0mL = 0.22L
  • Initial pressure P₁ = 105kPa = 1.03627atm
  • Initial temperature T₁ = 275K
  • Final volume V₂ = 95.0mL = 0.095L
  • Final temperature T₂ = 310K
  • Final pressure P₂ = ?

To calculate the new temperature of the gas, we substitute our given values into the equation above.

P₁V₁/T₁ = P₂V₂/T₂

P₁V₁T₂ = P₂V₂T₁

P₂ = (P₁V₁T₂) / V₂T₁

P₂ = ( 1.03627atm × 0.22L × 310K ) / ( 0.095L × 275K )

P₂ = 70.673614LatmK / 26.125LK

P₂ = 2.705atm

P₂ = (2.705 × 101.325)kPa

P₂ = 274 kPa

The new pressure of the sample of helium gas in a cylinder with a movable piston is 274 kPa.

Option 4)274 kPa is the correct answer.

Learn more about the combined gaslaw here: brainly.com/question/25944795

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