An engineer decides to develop technology that will help decrease sound pollution due to highway traffic noise. What step of the engineering process did she just undertake?

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

How many moles of oxygen gas are produced from the decomposition of six moles of potassium