Is the formation of rust on an iron nail a chemical change or a physical change? Explain your answer.

A sample of the mineral calcite has a volume of 15 cm³ and a mass of 40.5 g. What is the density of the calcite? A. 0.37 g/cm³ B. 2.7 g/cm³ C. 55.5 g/cm³ D. 607.5 g/cm³

The star Rho1 Cancri is 57 light-years from the earth and has a mass 0.85 times that of our sun. A planet has been detected in a circular orbit around Rho1 Cancri with an orbital radius equal to 0.

Which of the following is NOT one of the three components of a nucleotide? A.) carboxyl group B.) phosphate C.) 5-carbon sugar

What is a thermostat?

Describe an investigation that you carry out. To find out the thickness of a layer insulating material affects the energy transfer

Wave can be described as A. a continuous transmission of energy from one location to the next B. The disturbance of particles in an area C. The transmission of energy through individual particles D. The motion of particles in a medium

A germ is also called a microorganism or a microbe. True False

What is 1.33Ω plus 2Ω?

As a fire truck approached Mary, the pitch of the siren got higher. once the fire truck passed and moved away, the sirens pitch got lower. this change in pitch is because in the sound waves

Find the magnitude of the sum of these two vectors