Questions from General Chemistry

Q: Evaluate each of the following mathematical expressions, and express the answer

Evaluate each of the following mathematical expressions, and express the answer to the correct number of significant digits. a. (4.771 + 2.3)/3.1 b. 5.02 * 102 + 4.1 * 102 c. 1.091 * 103 + 2.21 * 1...

Q: Classify each of the following as a physical or chemical change or

Classify each of the following as a physical or chemical change or property. a. Milk curdles if a few drops of lemon juice are added to it. b. Butter turns rancid if it is left exposed at room tempe...

Q: Without actually performing the calculations indicated, tell to how many significant

Without actually performing the calculations indicated, tell to how many significant digits the answer to the calculation should be expressed. b. (67.41 + 0.32 + 1.98)/(18.225) c. (2.001 * 10-3)(4.7...

Q: We use chemical reactions in our everyday lives, too, not

We use chemical reactions in our everyday lives, too, not just in the science laboratory. Give at least five examples of chemical transformations that you use in your daily activities. Indicate what t...

Q: Under ordinary conditions, only a few pure elements occur as liquids

Under ordinary conditions, only a few pure elements occur as liquids. Give an example of a metallic and a nonmetallic element that ordinarily occur as liquids.

Q: Evaluate each of the following and write the answer to the appropriate

Evaluate each of the following and write the answer to the appropriate number of significant figures. a. (2.0944 + 0.0003233 + 12.22)/(7.001) b. (1.42 * 102 + 1.021 * 103)/(3.1 * 10-1) c. (9.762 *...

Q: Oxygen forms molecules in which there are two oxygen atoms, O2

Oxygen forms molecules in which there are two oxygen atoms, O2. Phosphorus forms molecules in which there are four phosphorus atoms, P4. Does this mean that O2 and P4 are “compounds” because they cont...

Q: Perform each of the following conversions, being sure to set up

Perform each of the following conversions, being sure to set up the appropriate conversion factor in each case. a. 12.5 in. to centimeters b. 12.5 cm to inches c. 2513 ft to miles d. 4.53 ft to me...

Q: Perform each of the following conversions, being sure to set up

Perform each of the following conversions, being sure to set up the appropriate conversion factor in each case. a. 2.23 m to yards b. 46.2 yd to meters c. 292 cm to inches d. 881.2 in. to centimete...

Q: Perform each of the following conversions, being sure to set up

Perform each of the following conversions, being sure to set up the appropriate conversion factor in each case. a. 1.75 mi to kilometers b. 2.63 gal to quarts c. 4.675 calories to joules d. 756.2...