What evidence indicates that a reaction has occurred? (Select all that apply.)

The temperature decreased.

A solid brown product formed.

The temperature increased.

A gas formed.

An explosion occurred.

Which of the following are examples of mutually exclusive events? Group of answer choices walking and running at the same time all of these rain and a cloudless sky snow and a temperature of 10° Celsius

Motor oil is responsible for

Which of the following terms describes the amount of time that a vehicle can be operated with its headlights on before battery voltage drops to 10.5V? Group of answer choices ampere-hours rating wattage reserve capacity cold cranking amps

You read a research study that concludes that the higher a student's self-esteem, the better he performs in school.

If water is flowing into the tank at the rate of 100 gallons per hour and flowing out of the tank at a constant rate of one gallon per minute, the water level in the tank will:

Just getting to your class is enough for showing up. A) True B) False

A completely reversible heat pump produces heat at a rate of 100 kW to warm a house maintained at 25℃. The exterior air, which is at 0℃, serves as the source.

A closed system undergoes a process in which work is done on the system and the heat transfer Q occurs only at temperature Tb. For each case, determine whether the entropy change of the system is positive, negative, zero, or indeterminate.

A scientist who is evaluating an ancient human skeleton for signs of vitamin and nutrient deficiency is conducting:

Which of the following is required in order to make a protected left turn A. A left green arrow B. No oncoming traffic C. A left turn only lane D. A large enough gap