Exam 1: The Science of Chemistry

Classify the following as representing -The temperature outside is 37 °C.

Which of the following statements is false?

A tentative model or picture that offers an explanation for a scientific law is called a ________.

A generalization that summarizes in a concise manner facts about natural phenomena is called a ________.

Indicate whether each of the following statements represents a fact, a scientific law, or a hypothesis. -Giraffes grew long necks over time to reach food sources in the trees during dry weather.

Indicate whether each of the following statements is true or false. - A theory is an explanation for which no experimental basis has yet been found.

Chemists discovered that a class of compounds called esters could be produced by reacting carboxylic acids with alcohols. Esters are very fragrant and are incorporated into perfumes, and they are used as flavorings in foods. The use of esters in perfumes and foods is an example of ________.

The vastness and volume of chemical information about our world requires that chemistry be divided into subdisciplines. Match the area of study to its subdiscipline of chemistry by placing the appropriate letter in each blank space provided. ‪

Match the definitions below with the terms at the bottom. -________ Tentative model that has been tested and validated over long periods of time

Einstein first stated the relationship between energy and mass, E = mc², which states that energy (E) equals mass (m) times the speed of light (c) squared. This is an example of a ________.

Suppose you were handed two drinking glasses, each containing a clear, colorless liquid. Four alternative hypotheses were postulated concerning the liquids contained in the glasses. 1) Both glasses contain water only. 2) One glass contains sugar dissolved in water, and the other glass contains water only. 3) One glass contains salt dissolved in water, and the other glass contains sugar dissolved in water. 4) Both glasses contain salt dissolved in water. Which of the hypotheses could be rejected by tasting the liquid in one of the glasses and determining that it tasted sweet?

Indicate whether each of the following statements represents -A beaker containing calcium carbonate weighs 96.543 grams.

When a doctor makes a diagnosis based on laboratory tests, this ________.

Which of the following statements is incorrectly classified as a fact, a scientific law, or a hypothesis?

Indicate whether each of the following statements represents -The volume of a container of gas decreases as the pressure in the container increases.

Indicate whether each of the following statements represents a fact, a scientific law, or a hypothesis. -The wavelength of any source of light is inversely proportional to its frequency. ________

Match the definitions below with the terms at the bottom. -________ Generalization that summarizes in a concise way information about natural phenomena

Teflon is produced when 1,1,2,2-tetrafluoroethene (F₂C=CF₂) is polymerized. Scientists soon observed that many materials would not adhere to surfaces coated with Teflon. Today, Teflon is used to coat cookware to produce non-stick surfaces. This represents an application of ________.

Indicate whether each of the following statements is true or false. - It is much easier to "prove" a hypothesis than it is to "disprove" it.

Which of the following pairings of terms is incorrect?