Three clues that indicate a chemical change

Tina lifted a box 0.5 m. the box weighed 25 n. how much work did tina do on the box?

Which is an example of a mixture? A, water B. hydrogen gas C. a blueberry muffin D. a spoon made of the element silver

A 6.4-N force pulls horizontally on a 1.5-kg block that slides on a smooth horizontal surface. This block is connected by a horizontal string to a second block of mass m2=0.

If an atom has two electrons outside of its nucleus, what number of protons and neutrons must be contained in the nucleus to result in a neutral atom? A. 2 protons, 2 neutrons B. 1 proton, 1 neutron C. 1 proton, 3 neutrons D. 4 protons, 4 neutrons

How do you find the net force acting on an object? a) find the largest force on the object b) add all the force vectors c) find the reaction force d) assume there is no friction

How much work is required to move a box 5 meters across the floor with a force of 15N?

Why have plants in the alpine biome adapted to survive on limited nutrients?

At a molecular level, does plasma have more or less energy than other states of matter?

A bobsledder pushes her sled across horizontal snow to get it going, then jumps in. After she jumps in, the sled gradually slows to a halt.

How can you predict the action of the element