A(n) is a device that measures a change in speed

A. Thermometer
B. Hygrometer
C. Accelerometer
D. Odometer
(I really need answer quickly guys )

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

The equation below shows a chemical reaction. a + b + heat —> c + d according to the law of conservation of energy, which statement is true? a. the reactants absorb heat because they have less energy than the products. b. the products release heat because they have more energy than the reactants. c. the reactants generate heat because they have more energy than the products. d. the products require heat to form because they have less energy than the reactants.

Chemical engineering who specializes in negotiating for large purchases and instructing customers in use of the products are