From Questions to Solutions

What best describes why the critical angle of an air-glass boundary is 39.3 degrees? A. It represents the angle of total internal reflection. B. It indicates the angle of refraction

What is the perimeter (in centimeters) of a rectangle with a length of 4.5 cm and a width of 8.2 cm? A. 25.4 cm B. 73.8 cm C. 12.7 cm

What atomic symbol completes this reaction? ГРо 220 Po → 84 ? + liei O 224 Pb 82 04 2+ He 2 o 220 At 85 0 220 Rn 86

The rate of a reaction increases 2.21 times as the temperature changes from 70°C to 80°C. Calculate the activation energy. a) 15.4 kJ/mol b) 25.7 kJ/mol c) 38.2 kJ/mol d)

The vapor pressure of ethanol is 450 mmHg at 68.5°C. Its molar heat of vaporization is 39.3 kJ/mol. What is the vapor pressure of ethanol, in mmHg, at 40.9°C?

Demand for 2 ounce potato chip bags is normally distributed. The average demand during the lead time is 80, 000 bags with a variance during the lead time of 10,

The combined weight of 5 student backpacks is 36.9 pounds. What is the approximate weight of 1 backpack?

Convert height in centimeters to feet and inches. - Take input height in centimeters from the user. - Convert it to feet and inches. - Feet must be a whole

What is the normal temperature range for a rectal temperature? A) 35.5 to 37.5 °C (95.9 to 99.5 °F) B) 36.6 to 38 °C (97.9 to 100.4 °F) C) 34.7

An NFL prospect is running the 40-yard dash (also known as the 36.6-meter dash). He accelerates at 4.9 m/s² to a final velocity of 8.17 m/s, then finishes the rest

A buffer is prepared by mixing 38.2 mL of 0.183 M NaOH with 125.7 mL of 0.231 M acetic acid. What is the pH of this buffer? (The pKa for

[tex] \begin{array}{|l|l|} \hline \text{Ideal gas law} & P V = n R T \\ \hline \text{Ideal gas constant} & R = 8.314 \left[ \frac{L \cdot kPa}{mol \cdot K} \right] \\

A local charity collected an estimated 38.2 million dollar last year . How is this amount written using science notation?

What quantity of heat, in kJ, is required to convert 29.0 g of ethanol ([tex]C_2H_5OH[/tex]) at 23.0 [tex]^\circ C[/tex] to a vapor at 78.3 [tex]^\circ C[/tex] (its boiling point)? Given:

How many moles and how many atoms of selenium are in a sample weighing 39.4 mg?