Which describes the reaction of a substance to form one or more res substance?

a physical change

a change of state

ca chemical change

10 centimeter represents 1 meter. If a class room is 5 centimeters by 7 centimeters. What are the actual dimensions of the classroom?

What occurs when a liquid changes to a gas below its surface as well as on the surface? a. Sublimation b. Boiling c. Condensation d. Evaporation

Buoyancy makes objects A. feel heavier. B. feel lighter. C. fly.

The acceleration due to gravity at the surface of a planet depends on the planet's mass and size; therefore other planets will have accelerations due to gravity different from 9.8 m/s2.

For each of the following, draw the resulting wave when the two pulses occupy the same space. Unless otherwise noted, each wave has an amplitude of + / - A.

What is the expected wavelength (in cm) of 10.5 ghz microwaves in free space?

There are 5,280 feet in 1 mile and 12 inches in one foot. How many inches are in a mile?

An anion is an atom that has lost electrons. True or False?

Question: Jane, looking for Tarzan, is running at top speed (4.5 m/s) and grabs a vine hanging vertically from a tall tree in the jungle.

Kim holds a pinwheel in the air and says it can be used to model a source of energy. Identify the type of energy Kim's pinwheel models. Explain the type of energy source used.