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3 years ago

How is the density of a substance calculated?

1 answer:

3 0

Example:

sample density of gasoline, 20 g of weigth into 5 mL

Answer:

D = m / V

D = 20 g / 5 mL

D = 4 g/mL

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Infectious agents vary in their size and shape. Which infectious agent tends to be the smallest?

Anika [276]

Answer:

prions

Explanation:

They are the smallest infectious agent.

8 0

2 years ago

Which of the following is true about chemical reactions. A. they are accompanied by changes in energy. B. they form new substanc

Ilia_Sergeevich [38]

The correct answer should be option C. hope this helps

7 0

3 years ago

at atmoshperic pressure, a balloon contains 2.00L of nitrogen of gas. How would the volume change if the Kelvin temperature were

Nataly [62]

Answer: The percent change in volume will be 25 %

Explanation:

To calculate the final temperature of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

$\frac{V_1}{T_1}=\frac{V_2}{T_2}$

where,

$V_1\text{ and }T_1$ are the initial volume and temperature of the gas.

$V_2\text{ and }T_2$ are the final volume and temperature of the gas.

We are given:

$V_1=2L\\T_1=T_1\\V_2=?\\T_2=75\% \text{ of }T_1=0.75\times T_1$

Putting values in above equation, we get:

$\frac{2L}{T_1}=\frac{V_2}{0.75\times T_1}\\\\V_2=\frac{2\times 0.75\times T_1}{T_1}=1.5L$

Percent change of volume = $\frac{\text{Change in volume}}{\text{Initial volume}}\times 100$

Percent change of volume = $\frac{(2-1.5)}{2}\times 100=25\%$

Hence, the percent change in volume will be 25 %

5 0

3 years ago

Sixty liters of a gas were collected over water when the barometer read 663 mmhg , and the temperature was 20∘c. what volume wou

lesya [120]

First, let's compute the number of moles in the system assuming ideal gas behavior.

PV = nRT
(663 mmHg)(1atm/760 mmHg)(60 L) = n(0.0821 L-atm/mol-K)(20+273 K)
Solving for n,
n = 2.176 moles

At standard conditions, the standard molar volume is 22.4 L/mol. Thus,

Standard volume = 22.4 L/mol * 2.176 mol = 48.74 L

3 0

3 years ago

Classify the below solids as amorphous or crystalline. emerald glass MgCl, rubber

svet-max [94.6K]

Answer:

Here yo

Explanation:

6 0

2 years ago

Read 2 more answers