Exam 1: Chemical Tools: Experimentation and Measurement

Pyrite is called fool's gold because it looks like real gold.However,pyrite has a density of 4.5 g/mL while gold has a density of 19.3 g/mL.Use this information to determine which of the following statements is true.

Without using a calculator,solve the following problem:

The diameter of the nucleus of an atom is approximately 1 × 10^-13 cm.If 1 nm is equal to 10 what is the diameter of the nucleus in

The temperature of 1.00 mL of water is raised by 1.00°C for every 4.184 joules of heat absorbed by the water.How many liters of water can be raised from 21.0°C to 100.0°C by the absorption of 8.88 kcal of heat generated by the combustion of natural gas?

________ refers to how well a number of independent measurements agree with one another,whereas ________ refers to how close to the true value a given measurement is.

If the melting point of titanium metal is 1672°C,what is its melting point in Kelvin?

A piece of metal ore weighs 8.50 g.When a student places it into a graduated cylinder containing water,the liquid level rises from 21.25 mL to 26.47 mL.What is the density of the ore?

A mass of mercury occupies 0.650 L.What volume would an equal mass of ethanol occupy? The density of mercury is and the density of ethanol is 0.789 g/mL.

A heptane molecule contains 16 atoms of hydrogen.The number 16 represents how many significant figures?

Use the drawings below to answer the following questions. -If hitting the bull's-eye is the desired result,Figure (c)represents

The output of a pendant manufacturer is 4335 pounds per week.If each pendant weighs 0.0133 pounds,how many pendants does the manufacturer make in one day?

An automobile uses gasoline at a rate of 35 mi/gal,which is the same as ________ km/L (1 km = 0.6214 mi,1 gal = 3.78 L).

Specific gravity of a liquid is often defined as the ratio of the density of a substance to the density of water.If the specific gravity of X relative to water is 0.800 and the specific gravity of Y relative to water is 1.50,which of the following statements is false?

Chemistry is the study of the composition,properties,and transformations of ________.

Each of the numbers in the following calculation represents a quantity measured by a student in the laboratory. g = 0.0220 × × 12.0 After performing the calculation,the student's calculator appeared as shown below: To the correct number of significant figures what is the value of g?

A student weighed 3.000 μg of sulfur in the lab.This is the same mass as

How many significant figures are there in the answer to the following problem? (3.335 × 6.500)+ 0.940 = ?

Round off 477,503 to four significant figures.

Consider the calculation: Which of the following is the answer to this question with the correct number of significant digits?

Which of the following volumes is equal to 60.0 mL?