A student collected the data shown in the table below during an experiment.

Liquid Characteristics
Liquid Characteristics
Boiling Point Freezing Point Color Rate of Evaporation
Mercury 357 °C −39 °C shiny silver gray negligible
Alcohol 78 °C −115 °C colorless rapid

Based on the data, which of the following conclusions can be made about the use of mercury and alcohol thermometers? (5 points)
An alcohol thermometer can measure the freezing point of a liquid that freezes at −80 °C.
An alcohol thermometer can measure a wider range of temperatures in a laboratory.
An alcohol thermometer is more reliable to measure the temperature of a liquid in a beaker that is 80 °C.
An alcohol thermometer is better to measure the boiling points of colorless liquids.

Express the following number in scientific notation. 0.026890 =

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

These questions are based on the attached photo. the experiment is about burning magnesium metal with oxygen. 1. write the balanced chemical equation for the reaction you are performing. 2. calculate the mass of magnesium metal used in each trial. o trial 1: o trial 2: 3. calculate the actual yield of magnesium oxide for each trial. o trial 1: o trial 2: 4. magnesium is the limiting reactant in this experiment. calculate the theoretical yield of mgo for each trial. o trial 1: o trial 2: 5. determine the percent yield of mgo for your experiment for each trial. o trial 1: o trial 2: 6. determine the average percent yield of mgo for the two trials. your company currently uses a process with a similar cost of materials that has an average percent yield of 91 percent. if the average percent yield of this process is higher than that, this could save the company money. what is your recommendation to the company? support your recommendation using your data, calculations, and understanding of stoichiometry gathered from this lab.