Which of the following is not an indication of a chemical reaction? a substance dissolves formation of a precipitate color change the container gets cold

Explain how a charged rod can attract a neutral piece

You drop a rock off of a building. It takes 4.5s to hit the ground. How tall is the building?

Technician A says that for best results, loosen the fastener immediately after spraying it with penetrating oil. Technician B says that rusted fasteners may be loosened by tapping with a hammer. Which technician is correct? a. technician A only b.

Which two of the Sun's layers are often reversed in larger stars? core radiative zone convective zone photosphere chromosphere

Which of the following describes the way an object moves when an unbalanced force acts upon it? Choose one answer. a. The object will move in the direction of the force. b. The object will not move. c.

White moths were found in huge numbers in the city of Birmingham. These moths could be easily camouflaged by the trees. Because of sudden industrial development, the trees in the city were covered with soot.

What two factors determine how fast weathering occurs

A sound that's produced by a single wave at a constant frequency and with no overtones is called

Which of the following is ignored when determining the relative mass of atoms? protons nucleus electrons. neutrons

Gamma radiation can be significantly reduced by ... A sheet of paper Air A 3 mm thickness of aluminium Several cm of lead