Which of the following is a definite indicator of a chemical change?

A.

The shape of a substance is changed.

B.

A new substance is formed.

C.

A substance is converted from a liquid to a gas.

D.

The change in a substance is reversible.

How important is your role as a human being in the natural world

Two piston hydraulic problems a. A = 1 sq. in. b. B = 10 sq. in. If a force is applied to piston A and it moves 6 in down, the weight of piston B will move how many inches up?

Which is not standing in the way of astronomers getting a good view of distant stars?

Using a 40w light bulb for 12 hours will consume how much energy?

Consider a simple parallel-plate capacitor whose plates are given equal and opposite charges and are separated by a distance d. Suppose the plates are pulled apart until they are separated by a distance D > d.

Which actions are evidence that a chemical reaction has occurred? Check all that apply. A: a change in color B: the formation of a precipitate C: a clear liquid becoming cloudy D: a change in shape E: the formation of bubbles F: the formation of

Which sphere forms Earth's outermost layer? Atmosphere Biosphere Cryosphere Hydrosphere

an 100kg object traveling at 50m/s collides (perfectly inelastic) with a 50kg object initially at rest. what is the sum of the momentum of both objects prior to the collision?

A train moves at constant velocity of 50km/h. how far will it move in 0.5h?

Which process best describes part of a scientific investigation? O designing a solution O evaluating the conclusion O evaluating the solution O identifying the conclusion