*Question*
Q: When atoms gain or lose electrons, they can form electrically charged particles called what? Choices: - crystals - eons - toxins - ions A:
**Answer**
ions

*Question*
Q: What units are typically used to measure heats of reaction? Choices: - degrees Celsius - volts - kilobytes - kilojoules A:
**Answer**
kilojoules

*Question*
Q: What serves as a first responder to pathogenic threats that bypass natural physical and chemical barriers of the body? Choices: - cells immune system - super immune system - immense immune system - innate immune system A:
**Answer**
innate immune system

*Question*
Q: What do waves do when they are unable to pass through an object? Choices: - produce off - Roll over. - develop off - reflect off A:
**Answer**
reflect off