Which of the following is an endothermic reaction?

a. burning wood

b. an explosion

c. burning a match

d. the cooling of an ice pack

What liquid did Anders Celsius use to make his thermometer?

An object is accelerating if there is a change in speed and which factor? a. time b. position c. direction d. displacement

Which of the following should be done when designing an experiment for a controlled scientific investigation? A. list the procedures B. plan the variables C. list the needed materials D. all of these

For a reaction system at equlibrium, le chateliers principle can be used to predict the

If a catalyst is used in a reaction, a. the energy of activation increases. b. different reaction products are obtained. c. the reaction rate increases. d. the reaction rate does not change

Biofuel is any fuel that is produced from living or once living matter in a short period of time, days, weeks, or even months.

How are revolution and year related

Read the scientific question below. "Does sunlight make plants live?" What is a likely hypothesis for the question?

A chemist is using a solution of HNO3 that has a pH of 3.75. What is [H+] for the solution?

What is the oxidation number for CO2