Which is a characteristic of a physical change?

The chemical bonds in the substance are unchanged.

The change cannot be seen.

The molecules all move at the same speed.

The substance has reacted with another substance.

On very dry days, when you use a comb or a brush, your hair sometimes stands on the end and maybe even sticks to the comb or brush. Explain why this happens in terms of electric charge.

Basalt, formed from magma, contains iron-rich minerals. Why is this important?

Which of the following types of radiation can penetrate through paper but not through wood? Alpha rays Beta rays Gamma rays Proton rays

1.80 kJ of heat is added to a slug of gold and a separate 1.80 kJ of heat is added to a slug of manganese. The heat capacity of the gold slug is 149J/°C while the heat capacity of the manganese slug is 505 J/°C.

What are 2 ways objects interact after a collision?

The smallest units of matter that normally cannot be broken down are

What relationship exists between the amplitude of a wave and amount of disturbance in the water?

If the speed of the wave on the guitar string is 600 m/s. Determine the period of that wave. Show all of your work including the initial equations and include the units in your answer

A bumper car with a mass of 200 kilograms traveling at a velocity of 3.5 meters/second collides with a stationary bumper car with a mass of 250 kilograms. If the two bumper cars stick and move together at a velocity of 2.

Why might city areas have a higher temperature than rural areas?