Which of these is NOT an example of physical change?

A. a change of state

B. a change of size

C. a change of mass

D. a change of appearance

Which of the following will result from increasing the temperature of a gas? O A. The number of gas molecules will increase. O B. The molecules will be forced into a smaller space together. O C. The molecules will slow down. O D.

Where are stars from in the spiral galaxy

A chemist weighed out 19.9 g of aluminum. Calculate the number of moles of aluminum she weighed out.

Which of the following is not equal to 0.536 kilometers? 53.6 hectometers (hm) 536 meters (m) 536.000 millimeters (mm) 53,600 centimeters (cm)

Dna is made up of repeating units called _?

If a net force of 5.0 forward acts on a 0.60 kg toy car, what is it's acceleration?

Which physical method can be used for obtaining a sample of salt from a small beaker of salt water? boiling freezing chromatography sorting

A gas expands in volume from 26.7 to 89.3 mL at constant temperature. Calculate the work done (in joules) if the gas expands (a) against a vacuum, (b) against a constant pressure of 1.5 atm, (c) against a constant pressure of 2.8 atm. (1L⋅atm=101.

Beta particles are emitted from radioactive atom p when it disintegrates spontaneously to form non radioactive atom q. which of these statements is most likely correct about atom p and atom q?

What should I do for the science fair?