Exam 1: Keys to the Study of Chemistry

The joule is the SI unit of energy and is equal to 1 kg m² s^-2. The erg is another energy unit, equal to 1 g cm² s^-2. Use unit conversion methods to work out how many ergs are in 1 joule.

You prepare 1000. mL of tea and transfer it to a 1.00 quart pitcher for storage. Which of the following statements is true?

The distance between carbon atoms in ethylene is 134 picometers. Which of the following expresses that distance in meters?

Which of the following correctly expresses 0.000007913 g in scientific notation?

A detailed explanation of natural phenomena that is generally accepted and has been extensively tested is called a

Which of the following activities is not a part of good science?

The appropriate number of significant figures in the result of 15.234 - 15.208 is

A large pizza has a diameter of 15 inches. Express this diameter in centimeters.

A scientist made careful measurements of the pressure and temperature of many different gases. Based on these measurements, he concluded that "the pressure of a fixed amount of gas, measured at constant volume, is directly proportional to its absolute temperature." This statement is best described as a

The numerical value of any temperature expressed in Celsius is always different from the numerical value of the same temperature in kelvin.

Which of the following represents the largest volume?

A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H₂SO₄, its mass is 1026.57 g. What is the density of concentrated sulfuric acid? (Assume water has a density of 1.00 g/cm³ at the temperature of the measurement.)

When applying the scientific method, a model or theory should be based on experimental data.

Select the best statement about chemistry before 1800.

Calculate (to three significant figures) the numerical part of the conversion factors needed to carry out the following unit conversions: a. density in g/cm³ to kg/m³ b. speed in mi/h to ft/s c. area in km² to mi² d. area in km² to cm² e. mass/area of aluminum foil in mg/cm² to g/m² f. number of gas molecules per unit volume from /m³ to /ft³ g. number of bacteria per unit area on a microscope slide from /mm² to /in²

During the swing of a frictionless pendulum, what energy form(s) remain constant?

In each of the sets below, choose the one quantity or number which is exact. a. i. the human population ii. the distance in light years from the sun to Alpha Centauri, a nearby star iii. the winning time for the 100 m dash in the Olympic Games b. i. the weight of a particular one cent coin in g ii. the boiling point of lead, in °C iii. the number of cm in 1 yd c. i. the measured value of the speed of light (2.998... × 10⁸ m/s) ii.  (3.141...) iii. the volume of milk in a 1-gallon jug

Select the answer with the correct number of decimal places for the following sum: 13.914 cm + 243.1 cm + 12.00460 cm =

A dose of medication was prescribed to be 35 microliters. Which of the following expresses that volume in centiliters?

The ripening of fruit, once picked, is an example of physical change.