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Maurinko [17]
2 years ago
9

Hello people ~

Chemistry
1 answer:
Natalija [7]2 years ago
8 0

Answer:

Opposes the motion

Explanation:

Let's take an example

  • Suppose you kicked a ball and the ball is doing down the ground
  • The friction makes the ball to stop after sometime .
  • So it opposed the ball's motion

option A is correct

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What is the volume of a 60.0 g object with a density of 2.12 g/cm3?
Katyanochek1 [597]

Answer:

127.2 g/cm^3

Explanation:

(Think of the DMV triangle. I'll attach a picture)

Volume = Density x Mass

Volume = 2.12 g/cm3 x 60.0 g

Volume = 127.2 g/cm3

Hope this helps!!!

-Unicorns110504

*Please mark brainliest*

7 0
2 years ago
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A 5.00-l tank contains helium gas at 1.50 atm. what is the pressure of the gas in torr if volume is doubled
vazorg [7]
<span>570 torr. The ideal gas law is PV = nRT where P = pressure V = volume n = number of moles of gas particles R = Ideal gas constant T = absolute temperature Since the value n, R, and T remain constant for this problem, that indicates that if the volume is doubled, the pressure will be halved. So the new pressure will be 1.50 atm / 2 = 0.750 atm. Now we just need to convert that from atm to torr. 1 atm is equal to 760 torr, so 0.750 atm * 760 torr/atm = 570 torr.</span>
5 0
3 years ago
What is a modern example of the scientific revolution
blsea [12.9K]

Answer:

Perhaps the best example of such a paradigm shift in science is the Copernican revolution in cosmology: the move from a geocentric to the heliocentric view of our solar system.

Explanation:

7 0
3 years ago
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When 78.6 g of urea CH4N2O are dissolved in 700. g of a certain mystery liquid X, the freezing point of the solution is 4.9 °C
iogann1982 [59]

Answer:

The van't Hoff factor of NaCl in liquid X is 1.69

Explanation:

Step 1: Data given

Mass of urea = 78.6 grams

Molar mass of urea = 60.06 g/mol

Mass of liquid X = 700 grams = 0.700 kg

he freezing point of the solution is 4.9°C lower than the freezing point of pure X

When 78.6 g of sodium chloride are dissolved in the same mass of X, the freezing point of the solution is 8.5°C lower than the freezing point of pure X.

Molar mass of NaCl = 58.44 g/mol

Step 2: Calculate moles

Moles urea = mass / molar mass

Moles urea = 78.6 grams / 60.06 g/mol

Moles urea = 1.31 moles

Moles NaCl = 78.9 grams / 58.44 g/mol

Moles NaCl = 1.35 moles

Step 3: Calculate molality

Molality = moles / mass of liquid

Molality urea = 1.31 moles / 0.700 kg

Molality = 1.87 molal

Molality NaCl = 1.35 moles / 0.700 kg

Molality NaCl = 1.92 molal

Step 4: Calculate the freezing point depression constant of X

ΔT = i*Kf*m

⇒with ΔT = the freezing point depression = 4.9 °C

⇒with i = the van't hoff factor of urea = 1

⇒with Kf =the freezing point depression consant of X = TO BE DETERMINED

⇒with m = the molality of urea solution = 1.87 molal

4.9 °C = 1 * Kf * 1.87 molal

Kf == 4.9 / 1.87

Kf = 2.62 °C/m

Step 5: Calculate the van't Hoff facotr of NaCl in X

ΔT = i*Kf*m

⇒with ΔT = the freezing point depression = 8.5 °C

⇒with i = the van't hoff factor of urea = TO BE DETERMINED

⇒with Kf =the freezing point depression consant of X = 2.62 °C/m

⇒with m = the molality of urea solution = 1.92 molal

8.5 °C = i * 2.62 °C/m * 1.92 m

i = 8.5 / (2.62 * 1.92)

i = 1.69

The van't Hoff factor of NaCl in liquid X is 1.69

5 0
2 years ago
A substance made of two or more elements chemically combined in a set ratio or proportion is called what?
bearhunter [10]
A substance made of two or more elements chemically combined in a set ratio or proportion is called a  : compound

For example, water is an example of a compound that made by two elements, Hydrogen and oxygen

hope this helps
7 0
2 years ago
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