A cube sliding across the table slows down and stops. Why does it stop?

describe how would you use chromatography to show whether blue ink contains a single purple dye or a mixture of dyes

When dissolved substances are spread evenly throughout a mixture it is called a

Bridget is in science class. Her teacher gives her two unknown substances and asks her to determine their relative pH. She places a piece of red litmus paper into both substances. The litmus paper turns purple when she places it into substance I.

8. Which of the following would not increase the rate of most reactions? A. Increasing the temperature B. Lowering the concentration of the reactants C. Removing an inhibitor D. Adding a catalyst

Which of the following shows the correct setup in converting 234 kilopascals to torr?

Calculate the voltage if the current is 0.5 A and the resistance is 2.0 Ω.

Moseley's changes to the periodic table were based mainly on what part of the scientific process

Which of the following precautions is important when using a Bunsen burner or Meker burner? a. Set up your work space so that wires and cables cannot accidentally make contact with the flame or hot glassware and meltb.

What explains the fact that no machine is 100 percent efficient? A. Friction transforms mechanical energy into thermal energy. B. Thermal energy is transformed into mechanical energy by friction. C.

For each example of a phase change, identify whether heat is absorbed from the surroundings or released into the surroundings. A popsicle melts on a hot day. Rubbing alcohol evaporates from the surface of the skin.