The pile of ash left after a fire burns out demonstrates what concept? A. Original materials remain after a physical change. B. A chemical change forms new substances. C. Physical properties are never stable. D. Fire recycles most substances.

How many grams of water will form if 10.54 g H2 react with 95.10 g O2

1. A window washer does not want to change her position. What does she want the forces acting on her to be? A. small B. large C. balanced D. unbalanced 2. When an object that is moving slows down, which action must be occurring? A. balanced forces B.

In a solution made by dissolving a salt, there will sometimes be only positive ions. 1. True 2. False

Mix 30 mL of water at 15 degrees Celsius and 30 mL of water at 55 degrees Celsius Answer These Questions Show your work. A.) What is the final volume of the water B.) What is the final Temperature of the water C.

Write a brief desperation for each of newtons three laws

Which of these planets are cassini currently orbiting Mars Saturn Mercury Jupiter

La temperatura a la cual las partículas de los gases no se mueven es: 1) Cero grados centigrados 2) 273 K 3) cero absoluto 4) cero grados Fharenheit

What appears to happen to the moon as it goes through the cucle

When H2 and CO2 react, acetic acid can be formed spontaneously while the production of formaldehyde requires an input of energy.

What is the enthaply of the reaction?