(Q).
Answer the following question given this paragraph: The subfield of thermochemistry studies the energy changes that occur over the course of various chemical reactions. We will first look at how these changes are measured and then go into quantitative descriptions of heat transfer. Calorimetry is a term used to describe the measurement of heat transfers, usually by monitoring changes in the temperature of an isolated system. A calorimeter is a device used to measure temperature changes during chemical processes. The simplest type of calorimeter is the constant-pressure device illustrated in Figure below . Q: What is a device used to measure temperature changes during chemical processes called? Choices: - altimeter - alethiometer - thermometer - calorimeter A:
(A).
calorimeter

(Q).
Answer the following question given this paragraph: Figure 42.5 In response to a cut, mast cells secrete histamines that cause nearby capillaries to dilate. Neutrophils and monocytes leave the capillaries. Monocytes mature into macrophages. Neutrophils, dendritic cells and macrophages release chemicals to stimulate the inflammatory response. Neutrophils and macrophages also consume invading bacteria by phagocytosis. Q: In response to a cut, mast cells secrete histamines that cause nearby capillaries to do what? Choices: - harden - narrow - constrict - dilate A:
(A).
dilate

(Q).
Answer the following question given this paragraph: Sound Auditory stimuli are sound waves, which are mechanical, pressure waves that move through a medium, such as air or water. There are no sound waves in a vacuum since there are no air molecules to move in waves. The speed of sound waves differs, based on altitude, temperature, and medium, but at sea level and a temperature of 20 C (68 F), sound waves travel in the air at about 343 meters per second. As is true for all waves, there are four main characteristics of a sound wave: frequency, wavelength, period, and amplitude. Frequency is the number of waves per unit of time, and in sound is heard as pitch. High-frequency (15.000Hz) sounds are higher-pitched (short wavelength) than low-frequency (long wavelengths; 100Hz) sounds. Frequency is measured in. Q: Because sound waves must move through a medium, there are no sound waves in a what? Choices: - solid - liquid - gas - vacuum A:
(A).
vacuum