A student collected the data shown in the table below during an experiment. Liquid Characteristics
Boiling Point Freezing Point Color Toxicity
Mercury 357 °C −39 °C shiny silver gray hazardous if tube is broken
Alcohol 78 °C −115 °C colorless relatively non-hazardous

Based on the data, which of the following conclusions can be made about the use of mercury and alcohol thermometers?
An alcohol thermometer can easily measure the boiling point of a colorless liquid that boils at 100 °C.
A mercury thermometer can easily measure the boiling point of a colorless liquid that boils at 82 °C.
A mercury thermometer can easily measure the freezing point of a colorless liquid that freezes at −50 °C.
An alcohol thermometer can easily measure the freezing point of a colorless liquid that freezes at −110 °C.

Achemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. an example of a chemical reaction is the formation of water from hydrogen and oxygen gas. in a physical change, a substance changes its physical appearance but not its chemical identity. an example of physical change is the formation of liquid water from solid water, a familiar process called melting. physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? oxygen gas changes to ozone during thunderstorms carbon dioxide is produced by the combustion of gasoline in an automobile engine. when coal, oil, and natural gas are decomposed in landsills they produce methane gas. freezing rain develops when a warm air mass overrides a cold air mass. fog forms from water vapor when the temperature drops below the dew point

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

The rules of engagement (roe) working group is often used to (select all that apply.)