In a heat engine, if 500 J of heat enters the system, and the piston does 300 J of work, what is the final internal (thermal) energy of the system if the initial energy is 1,500 J?

800 J

1,300 J

200 J

1,700 J

What is the molar mass of the following calcium fluoride molecule? CaF2 20 Ca 40.08 Calcium 9 F 19.00 Fluorine A. 18.99 grams B. 40.08 grams C. 78.08 grams D. 99.24 grams

Changing the pressure of a system has the highest effect on a substance in which phase? a. gas b. solid c. liquid d. plasma

During the Apollo missions between 1961-1972, they successfully landed on the moon 5 times starting in 1969. It should be noted that they also successfully lifted off from the surface of the moon.

Which of the following represents the sequence of Bronsted-Lowry acids and bases in the following equilibrium

Which element in period 3 on the periodic table is a metalloid? magnesium (mg) aluminum (al) silicon (si) sulfur (s)

What is a compound? a) a combination of two or more substances that are not chemically combined b) a combination of two or more elements that are combined in a certain ratio

A gas has a volume of 75mL at a pressure of 200.0 kPa. What will be the new volume be in mL if the pressure is decreased to 60.0 kPa in sig figs

Give two reasons why it's important to work with a partner in a lab

Suppose you have 3.00*1018 reams of lead (pb). how many lead atoms do you have? express the number of atoms numerically.

Why is a chemical indicator added to the flask in which a titration will occur? to show when enough base has been added to determine the starting pH of the solution to neutralize the acid before adding the base to identify the starting volume of