The Nature Of Chemistry

Which statement best describes pseudoscience? A.It is objective and backed by facts. B.It lacks a process for collecting data. C.It is constantly updated based on new information. D.It is closely analyzed before it is made known.

B.It lacks a process for collecting data.

Consider the following statement: "The element vanadium is a solid at room temperature, and its density is 6110 kilograms per meter cubed. Its melting point is 1910 degrees Celsius." Which correctly evaluates the statement? A.not reliable because opinions are presented B.reliable because testable facts are presented C.not reliable because it is very brief D.reliable because metric units are used

B.reliable because testable facts are presented

What negative impact did chemistry have on society through the production and use of chlorofluorocarbons (CFCs)? A.Hazardous coolants in refrigeration units were replaced. B.Better refrigeration reduced loss of food through spoilage. C.Lower levels of ozone allowed more ultraviolet radiation to reach Earth. D.Fire safety improved through the use of fire extinguishers.

C.Lower levels of ozone allowed more ultraviolet radiation to reach Earth.

The nutrition label on rice lists the amounts of proteins, carbohydrates, and fats in one serving. These substances are important for human nutrition. How are proteins, carbohydrates, and fats related to the discipline of chemistry? A.All are chemical compounds. B.All are found in living things. C.All are needed for nutrition. D.All are found in non-living things..

A.All are chemical compounds.

A high school class is discussing whether a particular discovery in chemistry has had a positive impact on society. Which question is the most important for the students to answer? A.How have people and the environment been affected by the discovery? B.How many scientists were involved in the discovery? C.When was the discovery made? D.At which institution was the discovery made?

A.How have people and the environment been affected by the discovery?

The discipline of chemistry has made agricultural chemicals, such as fertilizer and pesticides, available to society. Which is a negative effect of these chemicals on society? A.polluting the water supply B.contributing to greenhouse gases C.feeding harmful bacteria in the soil D.making it difficult for crops to grow

A.polluting the water supply

Which statement about the noble gases is most reliable? A.The chemistry of the reactions of noble gases is not very interesting. B. The noble gases are some of the most beautiful elements. C.The noble gases are in the rightmost column of the periodic table. D. The history of the discovery of noble gases is dull.

C.The noble gases are in the rightmost column of the periodic table.

The diagram shows the relationship between scientific disciplines. The names of some scientific disciplines have been removed from the boxes. Which scientific discipline belongs in the blue box? A.physics B.biology C.chemistry D.metallurgy

C.chemistry

Which is an example of pseudoscience? A.use of X-rays to observe the bones of the arm B.use of DNA analysis to determine paternity C.use of vaccines to prevent the occurrence of disease D.use of astrology to predict the personality of a child

D.use of astrology to predict the personality of a child