Which of the following are observations? The candle floats. The tires are flat. The dog is barking. The tire is flat because of a decrease in temperature. If a person walks by, then the dog will bark.

Frank wants to make a simple electromagnet. Which of these does Frank need to have to create the electromagnet? A. iron filings B. light bulb C. battery D. magnet

2 A (g) + B (g) - --> 2 C (g) Rate = k [A][B]At the beginning of one trial of this reaction, [A] = 3.0 M and [B] = 1.0 M. The observed rate for the formation of C is 0.36 mol L-1 sec-1. The numerical value of k, the rate constant, is closest to0.

What existed before the universe.

What single condition is required to insure that a molecule will be polar covalent? (A) a bond between atoms that are of widely different atomic weights. (B) a bond between atoms that are different in electronegativity. (C) a bond between like atoms.

Given the law of conservation of energy, what happens when a 200°C iron bar is placed in thermal contact with a 30°C block of wood? A. Energy leaves the iron bar and enters the wood until the temperatures are equal. B.

3. A good way to show the relationship between variables is to make a

How much energy is needed to heat 1 kg of sand, which has a specific heat of 664 J / (kg K), from 30°C to 50°C?

How much energy is needed to change 44 grams of ice at - 8° to steam at 107°?

One benefit of nuclear fission reactions is

How does the structure of the stigma aid in pollination?