Which of the following are not clues that a chemical reaction has taken place?

A. Steam

B. Formation of a gas

C. Change in color

D. Constant temperature

a jumbo jet is standing on a runway waiting for takeoff. It must have a velociyty of 45m/s to acheive takeoff. What is the planes acceleration if it takes five seconds for it to reach its takeoff velocity?

Work output of a large machine in a factory is 89,000 joules, and it's input is 102,000 joules. Work output of a similar machine is 92,000 joules, and it's work input is 104,000 joules. Which machine has a greater efficiency

How to solve tension force problems with friction with three masses?

Which of the following does not provide evidence that continents move? A. Formation of volcanoes B. Similar fossils found on different continents C. Nearly identical mountain ranges on two continents

What is the maximum number of bonds that can form in a molecule with a central atom containing five electrons in sp 3 hybrid orbitals?

In which one of the following locations can a person hear the echo of a sound? a. At least 33.2 meters behind the reflecting surface b. Less than 16.6 meters in front of the reflecting surface c. Less than 33.2 meters behind the reflecting surface d.

F an electron fell to a lower orbit or energy level, energy would be A. created. B. emitted. C. absorbed. D. transferred.

Which is the correct order from the closest to the sun to the farthest away from the sun? A. terrestrial planets, asteroid belt, gas planets, Kuiper belt B. gas planets, asteroid belt, terrestrial planets, Kuiper belt C.

Ethylene (C2H4) reacts with oxygen gas to produce carbon dioxide and water. 45.0 grams of ethylene reacts, how many grams of carbon dioxide gas will be produced?

What causes ice to melt and water to boil