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3 years ago

9

A ball is thrown at a reflecting surface (mirror) as shown. A video camera is placed in line with the reflected path of the ball

. What will the video camera record?

1 answer:

Oksanka [162]3 years ago

5 0

Explanation:

The video camera will record

A ball moving towards the camera, initially faster and then slower.

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Both balloons have a temperature of 25.0°C, contain

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DAnswer:

Explanation:

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3 years ago

what is the molarity of a concentrated hbr solution if the solution is 27.7% hbr by mass and has a density of 1.24 g/ml

givi [52]

Answer:
M = No.of moles of solute / Volume of solution in litres
HBr: H = 1 x 1 = 1 Br = 1 x 80
Molar mass : 81 g / mol
a. n = 27.7% / 100 =0.277 g / (81 g / mol) = 0.0034 mol

density = 1.24 g/ml ; D= m / v

b. 65.32 ml x 1 L / 1000 mL = 0.065 L


c. M= n / V
= 0.0034 mol / 0.065 L
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4 years ago

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3 years ago

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2. A submarine is able to raise and lower itself

Ronch [10]

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3 years ago

When a chemist collects hydrogen gas over water, she ends up with a mixture of hydrogen and water vapor in her collecting bottle

gizmo_the_mogwai [7]

Answer: The partial pressure of the hydrogen gas is 93.9 kiloPascals.

Explanation:

The partial pressure of the water vapors = $p_{H_2O,g}=3.2 kPa$

The partial pressure of the hydrogen gas = $p_{H_2}$

The pressure measured in the collecting bottle = $p=97.1 kPa$

While collecting the hydrogen gas in a collecting bottle with amount of water vapors also get introduced. The total pressure in the collecting bottle will be due to partial pressures of the water vapors and hydrogen.

$p=p_{H_2O,g}+p_{H_2}$

$97.1 kPa=3.2 kPa+p_{H_2}$

$p_{H_2}=97.1 kPa-3.2 kPa=93.9 kPa$

The partial pressure of the hydrogen gas is 93.9 kiloPascals.

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3 years ago